Transmitting method, transmitting device, receiving method and receiving device

Abstract

The present disclosure relates to a transmission method, a transmission device, a receiving method and a receiving device. The transmission method generates a plurality of first modulation signals (s1(i)) and a plurality of second modulation signals (s2(i)) according to transmission data; the plurality of first modulation signals (s1(i)) are signals generated using a 16QAM modulation method; the plurality of second modulation signals (s2(i)) are signals generated using a 64QAM modulation of a uniform constellation; a plurality of first signal processed signals (z1(i)) and a plurality of second signal processed signals (z2(i)) satisfying a prescribed formula are generated according to the plurality of first modulation signals (s1(i)) and the plurality of second modulation signals (s2(i)); when the 64QAM modulation used for generating the plurality of second modulation signals (s2(i)) is switched from a 64QAM modulation of a uniform constellation to a 64QAM modulation of a non-uniform constellation, the prescribed formula is changed.

Description

[0001] This application is a divisional application of the invention patent application with an international application date of July 12, 2017, a national application number of 201780042674.X (international application number of PCT / JP2017 / 025349), and an invention name of “Transmitting Method, Transmitting Device, Receiving Method and Receiving Device”. Technical Field

[0002] The present invention relates to a sending method, a sending device, a receiving method and a receiving device. Background Art

[0003] As wireless communication methods, single-carrier methods and multi-carrier methods such as OFDM (Orthogonal Frequency Division Multiplexing) have been studied (for example, see Non-Patent Document 1). Multi-carrier methods have the advantages of high frequency utilization efficiency and suitability for high-capacity transmission. Single-carrier methods have the advantages of not requiring signal processing such as FFT (Fast Fourier Transform) / IFFT (Inverse FFT), making them suitable for implementation with low power consumption.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: JAC Bingham, "Multicarrier Modulation for DataTransmission: An Idea Whose Time Has Come", IEEE Communications Magazine, May1990. Summary of the Invention

[0007] Problems to be solved by the invention

[0008] In wireless communications using a single-carrier system and / or a multi-carrier system, a technology for improving the quality of data reception is desired.

[0009] Means used to solve problems

[0010] A transmission method according to one technical solution of the present invention includes a mapping step, a signal processing step, and a transmission step. In the mapping step, a plurality of first modulated signals s1(i) and a plurality of second modulated signals s2(i) are generated based on the transmission data. Here, i is a symbol number that is an integer greater than or equal to 0. The plurality of first modulated signals s1(i) are signals generated using 16QAM modulation, and the plurality of second modulated signals s2(i) are signals generated using 64QAM modulation with a uniform constellation. In the signal processing step, a plurality of first signal-processed signals z1(i) and a plurality of second signal-processed signals z2(i) that satisfy a predetermined equation are generated based on the plurality of first modulated signals s1(i) and the plurality of second modulated signals s2(i). In the transmission step, the plurality of first signal-processed signals z1(i) and the plurality of second signal-processed signals z2(i) are transmitted using multiple antennas. The first signal-processed signals and the second signal-processed signals having the same symbol number are transmitted simultaneously at the same frequency. Here, when the 64QAM modulation used for generating the plurality of second modulated signals s2(i) is switched from the 64QAM modulation of the uniform constellation to the 64QAM modulation of the non-uniform constellation, the above-mentioned predetermined formula is changed.

[0011] A transmitting device according to one embodiment of the present invention includes a mapping unit, a signal processing unit, and a transmitting unit. The mapping unit generates multiple first modulated signals s1(i) and multiple second modulated signals s2(i) based on transmit data. Here, i is a symbol number that is an integer greater than or equal to 0. The multiple first modulated signals s1(i) are signals generated using 16QAM modulation, and the multiple second modulated signals s2(i) are signals generated using 64QAM modulation with a uniform constellation. The signal processing unit generates multiple first signal-processed signals z1(i) and multiple second signal-processed signals z2(i) that satisfy a predetermined equation based on the multiple first modulated signals s1(i) and the multiple second modulated signals s2(i). The transmitting unit transmits the multiple first signal-processed signals z1(i) and the multiple second signal-processed signals z2(i) using multiple antennas. The first signal-processed signals and the second signal-processed signals with the same symbol number are transmitted simultaneously at the same frequency. Here, when the 64QAM modulation used for generating the plurality of second modulated signals s2(i) is switched from 64QAM modulation with a uniform constellation to 64QAM modulation with a non-uniform constellation, the signal processing unit changes the above-mentioned predetermined equation.

[0012] A receiving method according to one technical solution of the present invention includes a receiving step and a demodulation step. In the receiving step, a received signal is obtained by receiving a first transmission signal and a second transmission signal transmitted from different antennas. The first transmission signal and the second transmission signal are signals transmitted using multiple antennas using a plurality of first signal-processed signals z1(i) and a plurality of second signal-processed signals z2(i). Here, i is a symbol number that is an integer greater than or equal to 0; the first signal-processed signal and the second signal-processed signal with the same symbol number are transmitted simultaneously at the same frequency. The plurality of first signal-processed signals z1(i) and the plurality of second signal-processed signals z2(i) are signals generated by performing the first signal processing and the second signal processing on a plurality of first modulated signals s1(i) generated using the 16QAM modulation method and a plurality of second modulated signals s2(i) generated using the 64QAM modulation method using a uniform constellation. The plurality of signals z1(i) after the first signal processing and the plurality of signals z2(i) after the second signal processing satisfy predetermined equations for the plurality of first modulated signals s1(i) and the plurality of second modulated signals s2(i). In the demodulation step, the received signal is demodulated by performing signal processing corresponding to the first signal processing and the second signal processing. Here, when the 64QAM modulation used to generate the plurality of second modulated signals s2(i) is switched from uniform constellation 64QAM modulation to non-uniform constellation 64QAM modulation, the predetermined equations are modified.

[0013] A receiving device according to one embodiment of the present invention includes a receiving unit and a demodulating unit. The receiving unit obtains a received signal obtained by receiving a first transmission signal and a second transmission signal transmitted from different antennas. The first transmission signal and the second transmission signal are signals transmitted using multiple antennas, namely, a plurality of first signal-processed signals z1(i) and a plurality of second signal-processed signals z2(i). Here, i is a symbol number that is an integer greater than or equal to 0; the first signal-processed signals and the second signal-processed signals having the same symbol number are transmitted simultaneously at the same frequency. The plurality of first signal-processed signals z1(i) and the plurality of second signal-processed signals z2(i) are signals generated by performing first signal processing and second signal processing on a plurality of first modulated signals s1(i) generated using 16QAM modulation and a plurality of second modulated signals s2(i) generated using 64QAM modulation with a uniform constellation. The plurality of signals z1(i) after the first signal processing and the plurality of signals z2(i) after the second signal processing satisfy predetermined equations for the plurality of first modulated signals s1(i) and the plurality of second modulated signals s2(i). The demodulator performs signal processing corresponding to the first signal processing and the second signal processing on the received signal to perform demodulation. Here, when the 64QAM modulation used to generate the plurality of second modulated signals s2(i) is switched from uniform constellation 64QAM modulation to non-uniform constellation 64QAM modulation, the predetermined equations are modified.

[0014] Effects of the Invention

[0015] According to the present invention, it is possible to improve the reception quality of data in wireless communications using a single-carrier scheme and / or a multi-carrier scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram showing an example of the structure of a transmitting device.

[0017] Figure 2 This is a diagram showing an example of the configuration of a signal processing unit of a transmitting device.

[0018] Figure 3 This is a diagram showing an example of the configuration of a signal processing unit of a transmitting device.

[0019] Figure 4 This is a diagram showing the capacity of each SNR in an AWGN environment.

[0020] Figure 5 This is a diagram showing an example of the configuration of a wireless unit of a transmitting device.

[0021] Figure 6 This is a diagram showing an example of a frame structure of a transmission signal.

[0022] Figure 7 This is a diagram showing an example of a frame structure of a transmission signal.

[0023] Figure 8 This is a diagram showing an example of the structure of a portion related to generation of control information.

[0024] Figure 9 This is a diagram showing an example of the configuration of an antenna unit of a transmitting device.

[0025] Figure 10 This is a diagram showing an example of a frame structure of a transmission signal.

[0026] Figure 11 This is a diagram showing an example of a frame structure of a transmission signal.

[0027] Figure 12 This is a diagram showing an example of a method of arranging codewords on the time axis.

[0028] Figure 13 This is a diagram showing an example of a method of arranging code elements on the frequency axis.

[0029] Figure 14 This is a diagram showing an example of a method for arranging code elements on the time-frequency axis.

[0030] Figure 15 This is a diagram showing an example of a method of arranging codewords on the time axis.

[0031] Figure 16 This is a diagram showing an example of a method of arranging code elements on the frequency axis.

[0032] Figure 17 This is a diagram showing an example of a method for arranging code elements on the time-frequency axis.

[0033] Figure 18 This is a diagram showing an example of the configuration of a wireless unit of a transmitting device.

[0034] Figure 19 This is a diagram showing an example of the structure of a receiving device.

[0035] Figure 20 This is a diagram showing an example of the relationship between a transmitting device and a receiving device.

[0036] Figure 21 This is a diagram showing an example of the configuration of an antenna unit of a receiving device.

[0037] Figure 22 This is a diagram showing an example of the structure of a transmitting device.

[0038] Figure 23 This is a diagram showing an example of the configuration of a signal processing unit of a transmitting device.

[0039] Figure 24 This is a diagram showing an example of the configuration of a signal processing unit of a transmitting device.

[0040] Figure 25 This is a diagram showing an example of the configuration of a signal processing unit of a transmitting device.

[0041] Figure 26 This is a diagram showing an example of the configuration of a portion of a signal processing unit of a transmitting device.

[0042] Figure 27 This is a diagram showing an example of the configuration of a portion of a signal processing unit of a transmitting device.

[0043] Figure 28 This is a diagram showing an example of the configuration of a portion of a signal processing unit of a transmitting device.

[0044] Figure 29 This is a diagram showing an example of the configuration of a portion of a signal processing unit of a transmitting device.

[0045] Figure 30 This is a diagram showing an example of the configuration of a portion of a signal processing unit of a transmitting device.

[0046] Figure 31 This is a diagram showing a configuration when CDD is used.

[0047] Figure 32 This is a graph showing the relationship between the ratio of the average power of 16QAM to the sum of the average power of 16QAM and the average power of 64QAM and the capacity for each SNR. DETAILED DESCRIPTION

[0048] (Implementation Method 1)

[0049] The transmission method, transmission device, reception method, and reception device of this embodiment are described in detail.

[0050] exist Figure 1 1 shows an example of the configuration of a transmitting device, such as a base station, access point, or broadcast station, according to this embodiment. Error correction coding unit 102 receives data 101 and control signal 100 as input, performs error correction coding based on information about the error correction code included in control signal 100 (e.g., error correction code information, code length (block length), and coding rate), and outputs coded data 103. Error correction coding unit 102 may also include an interleaver. If so, data may be rearranged after coding to output coded data 103.

[0051] Mapping unit 104 receives coded data 103 and control signal 100 as input, performs mapping corresponding to the modulation scheme based on the modulation signal information included in control signal 100, and outputs mapped signal (baseband signal) 105_1 and mapped signal (baseband signal) 105_2. Mapping unit 104 generates mapped signal 105_1 using a first sequence and generates mapped signal 105_2 using a second sequence. In this case, the first and second sequences are different.

[0052] The signal processing unit 106 receives the mapped signals 105_1, 105_2, the signal group 110, and the control signal 100 as input, performs signal processing based on the control signal 100, and outputs the processed signals 106_A and 106_B. In this case, the processed signal 106_A is represented as u1(i), and the processed signal 106_B is represented as u2(i) (i is a symbol number, for example, i is an integer greater than 0). In addition, regarding the use of signal processing Figure 2 Explained later.

[0053] Wireless unit 107_A receives processed signal 106_A and control signal 100 as input, processes processed signal 106_A based on control signal 100, and outputs transmission signal 108_A. Transmission signal 108_A is then output from antenna unit #A (109_A) as radio waves.

[0054] Similarly, wireless unit 107_B receives processed signal 106_B and control signal 100 as input, processes processed signal 106_B based on control signal 100, and outputs transmission signal 108_B. Transmission signal 108_B is then output from antenna unit #B (109_B) as radio waves.

[0055] Antenna unit #A (109_A) receives control signal 100 as input. Based on control signal 100, it processes transmission signal 108_A and outputs it as a radio wave. However, antenna unit #A (109_A) does not necessarily need to receive control signal 100 as input.

[0056] Similarly, antenna unit #B (109_B) receives control signal 100 as input. In this case, it processes transmission signal 108_B based on control signal 100 and outputs a radio wave. However, antenna unit #B (109_B) does not necessarily need to receive control signal 100 as input.

[0057] Alternatively, the control signal 100 may also be based on Figure 1 The information sent by the device of the communication partner can also be generated Figure 1The device includes an input unit and is generated based on information input from the input unit.

[0058] Figure 2 express Figure 1 An example of the structure of the signal processing unit 106 in FIG. The weighted synthesis unit (precoding unit) 203 uses the mapped signal 201A (equivalent to Figure 1 The mapped signal 105_1), the mapped signal 201B (equivalent to Figure 1 The mapped signal 105_2) and the control signal 200 (equivalent to Figure 1 100) as input, performs weighted synthesis (precoding) based on control signal 200, and outputs weighted signals 204A and 204B. At this time, mapped signal 201A is represented as s1(t), mapped signal 201B is represented as s2(t), weighted signal 204A is represented as z1(t), and weighted signal 204B is represented as z2'(t). Note that t is time, for example. s1(t), s2(t), z1(t), and z2'(t) are defined by complex numbers (and therefore, can also be real numbers).

[0059] The weighted combination unit (precoding unit) 203 performs the following calculations.

[0060] [Formula 1]

[0061]

[0062] In formula (1), a, b, c, and d can be defined by complex numbers, and thus a, b, c, and d are defined by complex numbers (which can also be real numbers). In addition, i is a symbol number.

[0063] Phase changer 205B receives weighted combined signal 204B and control signal 200 as input, applies a phase change to weighted combined signal 204B based on control signal 200, and outputs phase-changed signal 206B. Phase-changed signal 206B is represented by z2(t), where z2(t) is defined by a complex number (it may also be a real number).

[0064] The specific operation of phase changer 205B will be described. For example, assume that phase changer 205B applies a phase change of y(i) to z2'(i). Therefore, it can be expressed as z2(i) = y(i) × z2'(i), where i is a symbol number (i is an integer greater than or equal to 0).

[0065] For example, the phase change value is set as follows (N is an integer greater than 2, and N is the period of phase change) (if N is set to an odd number greater than 3, the data reception quality may be improved).

[0066] [Formula 2]

[0067]

[0068] (j is the imaginary unit)

[0069] However, equation (2) is merely an example and is not limited thereto. Therefore, it is assumed that the phase change value y(i) = ej × δ(i) is expressed.

[0070] In this case, z1(i) and z2(i) can be expressed by the following formula.

[0071] [Formula 3]

[0072]

[0073] Note that δ(i) is a real number, and z1(i) and z2(i) are transmitted from the transmitting device at the same time and frequency (same frequency band).

[0074] In the formula (3), the value of the phase change is not limited to the formula (2), and for example, a method of changing the phase periodically or regularly can be considered.

[0075] The (precoding) matrix in equations (1) and (3) is

[0076] [Formula 4]

[0077]

[0078] For example, the following matrix can be considered as the matrix F.

[0079] [Formula 5]

[0080]

[0081] or

[0082] [Formula 6]

[0083]

[0084] or

[0085] [Formula 7]

[0086]

[0087] or

[0088] [Formula 8]

[0089]

[0090] or

[0091] [Formula 9]

[0092]

[0093] or

[0094] [Formula 10]

[0095]

[0096] or

[0097] [Formula 11]

[0098]

[0099] or

[0100] [Formula 12]

[0101]

[0102] In addition, in formulas (5), (6), (7), (8), (9), (10), (11), and (12), α can be a real number or an imaginary number, and β can be a real number or an imaginary number. However, α is not 0 (zero). Also, β is not 0 (zero). Or

[0103] [Formula 13]

[0104]

[0105] or

[0106] [Formula 14]

[0107]

[0108] or

[0109] [Formula 15]

[0110]

[0111] or

[0112] [Formula 16]

[0113]

[0114] or

[0115] [Formula 17]

[0116]

[0117] or

[0118] [Formula 18]

[0119]

[0120] or

[0121] [Formula 19]

[0122]

[0123] or

[0124] [Formula 20]

[0125]

[0126] or

[0127] [Formula 21]

[0128]

[0129] or

[0130] [Formula 22]

[0131]

[0132] or

[0133] [Formula 23]

[0134]

[0135] or

[0136] [Formula 24]

[0137]

[0138] or

[0139] [Formula 25]

[0140]

[0141] or

[0142] [Formula 26]

[0143]

[0144] or

[0145] [Formula 27]

[0146]

[0147] or

[0148] [Formula 28]

[0149]

[0150] or

[0151] [Formula 29]

[0152]

[0153] or

[0154] [Formula 30]

[0155]

[0156] or

[0157] [Formula 31]

[0158]

[0159] or

[0160] [Formula 32]

[0161]

[0162] Among them, θ 11 (i), θ 21 (i) and λ(i) are functions (real numbers) of i (symbol number). λ is, for example, a fixed value (real number) (it may not be a fixed value). α can be either a real number or an imaginary number, and β can be either a real number or an imaginary number. However, α is not 0 (zero). Furthermore, β is not 0 (zero). Furthermore, θ11 and θ21 are real numbers.

[0163] Furthermore, each embodiment of this specification can be implemented using precoding matrices other than these.

[0164] [Formula 33]

[0165]

[0166] or

[0167] [Formula 34]

[0168]

[0169] or

[0170] [Formula 35]

[0171]

[0172] or

[0173] [Formula 36]

[0174]

[0175] In addition, β in equations (34) and (36) can be either a real number or an imaginary number. However, β is not 0 (zero). In addition, when the precoding matrix is ​​expressed as in equations (33) and (34), Figure 2 In the weighted synthesis unit 203, mapped signals 201A and 201B are not subjected to signal processing, but are output as weighted synthesized signal 204A and as weighted synthesized signal 204B respectively. In other words, weighted synthesis unit 203 may not be present. If weighted synthesis unit 203 is present, whether weighted synthesis is performed or not may be controlled by control signal 200.

[0176] The insertion unit 207A takes the weighted synthesized signal 204A, the pilot symbol signal (pa(t)) (t: time) (251A), the pre-synchronization signal 252, the control information symbol signal 253, and the control signal 200 as input, and based on the frame structure information contained in the control signal 200, outputs a baseband signal 208A based on the frame structure.

[0177] Similarly, the insertion unit 207B takes the phase-changed signal 206B, the pilot codeword signal (pb(t)) (t: time) (251B), the pre-synchronization signal 252, the control information codeword signal 253, and the control signal 200 as input, and based on the frame structure information contained in the control signal 200, outputs a baseband signal 208B based on the frame structure.

[0178] Phase changer 209B receives baseband signal 208B and control signal 200 as input, performs a phase change on baseband signal 208B based on control signal 200, and outputs phase-changed signal 210B. Baseband signal 208B is expressed as a function of symbol number i (i is an integer greater than or equal to 0), represented by x'(i). Phase-changed signal 210B (x(i)) can be expressed as x(i) = ej × ε(i) × x'(i), where j is an imaginary unit.

[0179] Alternatively, the operation of phase changer 209B may be CDD (Cyclic Delay Diversity) (CSD (Cyclic Shift Diversity)) as described in Non-Patent Documents 2 and 3. Furthermore, a characteristic of phase changer 209B is that it changes the phase of symbols existing in the frequency axis (performing a phase change on data symbols, pilot symbols, control information symbols, and the like).

[0180] exist Figure 2 In FIG, phase changer 209B is inserted into the diagram, but phase changer 209B may not be present. In this case, baseband signals 208A and 208B are Figure 2 output (the phase change unit 209B may also not operate).

[0181] Figure 3 express Figure 1 The structure of the signal processing unit 106 in Figure 2 Different examples. Figure 3 In the Figure 2 The same number is assigned to the parts that have the same action. Figure 2 The description of the parts that operate in the same manner is omitted here.

[0182] The coefficient multiplication unit 301A receives the mapped signal 201A (s1(i)) and the control signal 200 as input, multiplies the mapped signal 201A (s1(i)) by the coefficient based on the control signal 200, and outputs the coefficient-multiplied signal 302A. Furthermore, if the coefficient is u, the coefficient-multiplied signal 302A is represented as u×s1(i) (u can be either a real number or a complex number). However, when u=1, the coefficient multiplication unit 301A does not perform coefficient multiplication on the mapped signal 201A (s1(i)) and outputs the mapped signal 201A (s1(i)) as the coefficient-multiplied signal 302A.

[0183] Similarly, the coefficient multiplication unit 301B takes the mapped signal 201B (s2 (i)) and the control signal 200 as input, multiplies the mapped signal 201B (s2 (i)) by the coefficient based on the control signal 200, and outputs the signal 302B after the coefficient multiplication operation. In addition, if the coefficient is set to v, the signal 302B after the coefficient multiplication operation is expressed as v×s2 (i) (v can be either a real number or a complex number). However, when v = 1, the coefficient multiplication unit 301B does not perform the coefficient multiplication operation on the mapped signal 201B (s2 (i)) and outputs the mapped signal 201B (s2 (i)) as the signal 302B after the coefficient multiplication operation.

[0184] Therefore, the weighted synthesized signal 204A (z1(i)) and the phase-changed signal 206B (z2(i)) can be expressed by the following equations.

[0185] [Formula 37]

[0186]

[0187] In addition, regarding the example of the (precoding) matrix F, as described previously (for example, equations (5) to (36)), and regarding the example of the phase change value y(i), it is expressed by equation (2), but the (precoding) matrix F and the phase change value y(i) are not limited to these.

[0188] Next, the "(precoding) matrix F and phase change value y(i) when the modulation method of the mapped signal 201A (s1(i)) is QPSK (Quadrature Phase Shift Keying) and the modulation method of the mapped signal 201B (s2(i)) is 16QAM (QAM: Quadrature Amplitude Modulation)" used in the description of the present invention are explained.

[0189] Furthermore, it is assumed that the average (transmitted) power of the mapped signal 201A is equal to the average (transmitted) power of the mapped signal 201B.

[0190] At this time, as in equations (38) to (45), by obtaining the weighted synthesized signal 204A (z1 (i)) and the phase-changed signal 206B (z2 (i)), Figure 1 In the receiving device that receives the modulated signal sent by the transmitting device, the data reception quality can be improved.

[0191] [Formula 38]

[0192]

[0193] [Formula 39]

[0194]

[0195] [Formula 40]

[0196]

[0197] [Formula 41]

[0198]

[0199] [Formula 42]

[0200]

[0201] [Formula 43]

[0202]

[0203] [Formula 44]

[0204]

[0205] [Formula 45]

[0206]

[0207] In addition, in equations (38) to (45), α and β can be either real numbers or imaginary numbers.

[0208] The characteristic points of equations (38) to (45) are explained.

[0209] In equations (38) to (45), θ is set to π / 4 radians (45 degrees). The average (transmitted) power of signal 302A after coefficient multiplication differs from the average (transmitted) power of signal 302B after coefficient multiplication. However, by "setting θ to π / 4 radians (45 degrees)", the average (transmitted) power of signal 204A (z1(i)) after weighted synthesis and the average (transmitted) power of signal 206B (z2(i)) after phase change can be made equal. In the case of transmission regulations, when the average transmit power of the modulated signal transmitted from each antenna is set to be constant, it is necessary to "set θ to π / 4 radians (45 degrees)". Also, here, "θ is set to π / 4 radians (45 degrees)", but "θ can be any value of π / 4 radians (45 degrees), (3×π) / 4 radians (135 degrees), (5×π) / 4 radians (225 degrees), or (7×π) / 4 radians (315 degrees)."

[0210] In addition, the coefficients u and v are set as shown in equations (38) to (45).

[0211] In addition, it is described Figure 1 、 Figure 2 、 Figure 3 The method using equations (1) to (45) as an example generates code elements (for example, z1(i), z2(i)). At this time, the generated code elements can also be arranged in the time axis direction. In addition, when a multi-carrier method such as OFDM (Orthogonal Frequency Division Multiplexing) is used, the generated code elements can also be arranged in the frequency axis direction or in the time-frequency direction. In addition, the generated code elements can also be interleaved (rearranged) and arranged in the time axis direction, in the frequency axis direction, or in the time-frequency axis direction. However, the transmitting device transmits z1(i) and z2(i) of the same code element number i using the same time and the same frequency (the same frequency band).

[0212] exist Figure 4 In the middle, it means P QPSK is the average (transmit) power of QPSK, P16QAM is the average (transmitted) power of 16QAM, and the horizontal axis is P QPSK / (P QPSK +P 16QAM ), the vertical axis is the capacity of each SNR (Signal-to-Noise power Ratio) at capacity (in addition, the channel model in the curve graph is an AWGN (Additive White Gaussian Noise) environment). According to the results, it can be seen that by setting as in equations (38) to (45), the receiving device can obtain good data reception quality. In addition, Figure 4 In the graph, the 21 curves representing the relationship between power ratio and capacity correspond to SNR=0dB, 1dB, 2dB, ..., 20dB in order from the lower capacity.

[0213] Figure 1 The transmitting device switches the transmission method of the modulated signal based on the information of the transmission method included in the control signal 100. Figure 1 The sending device can select the following sending methods.

[0214] Sending Method #1:

[0215] The modulation mode of sending a single stream (s1(i)) is set to BPSK (Binary Phase ShiftKeying) (or π / 2 phase shift BPSK) (wherein the modulation signal of a single stream can be sent using one antenna or multiple antennas).

[0216] Sending Method #2:

[0217] The modulation mode of sending a single stream (s1(i)) is set to QPSK (Quadrature PhaseShift Keying) (or π / 2 phase shift QPSK) (wherein the modulated signal of a single stream can also be sent using one antenna or multiple antennas).

[0218] Sending Method #3:

[0219] The modulation method for transmitting a single stream (s1(i)) is set to 16QAM (or π / 2 phase-shifted 16QAM) (or 16APSK (APSK: Amplitude Phase Shift Keying) or other modulation methods in which there are 16 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the modulated signal of a single stream can be transmitted using one antenna or multiple antennas).

[0220] Sending Method #4:

[0221] The modulation method for transmitting a single stream (s1(i)) is set to 64QAM (or π / 2 phase-shifted 64QAM) (or 64APSK (APSK: Amplitude Phase Shift Keying), etc., a modulation method in which there are 64 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the modulated signal of a single stream can be transmitted using one antenna or multiple antennas).

[0222] Sending Method #5:

[0223] When transmitting two streams (s1(i) and s2(i)), the modulation method for s1(i) is set to BPSK (or π / 2-shifted BPSK), and the modulation method for s2(i) is set to BPSK (or π / 2-shifted BPSK). In this case, two modulated signals are transmitted: the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas.

[0224] Sending Method #6:

[0225] When transmitting two streams (s1(i) and s2(i)), the modulation method for s1(i) is set to QPSK (or π / 2 shift QPSK), and the modulation method for s2(i) is set to QPSK (or π / 2 shift QPSK). In this case, two modulated signals are transmitted: the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas.

[0226] Sending Method #7:

[0227] The modulation method of s1(i) for transmitting two streams (s1(i) and s2(i)) is set to QPSK (or π / 2 phase-shifted QPSK), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase-shifted 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shifting can also be implemented)). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas.

[0228] Sending Method #8:

[0229] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 16QAM (or π / 2 phase-shifted 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase-shifted 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna.

[0230] Sending Method #9:

[0231] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase-shifted 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase-shifted 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna.

[0232] At this time, based on Figure 2 、 Figure 3 Precoding (weighted combination) and phase change (phase changer 205B may not perform phase change) are performed. Assume that one of the (precoding) matrices shown in equations (13) to (20) is used as the precoding matrix. However, in equations (13) to (20), θ is assumed to be greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians).

[0233] Therefore, the following is satisfied.

[0234] Sending Method #1:

[0235] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is two.

[0236] Sending Method #2:

[0237] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is four.

[0238] Sending Method #3:

[0239] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 16.

[0240] Sending Method #4:

[0241] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 64.

[0242] Sending Method #5:

[0243] The number of signal points in the in-phase I-quadrature Q plane of the transmitted signal is greater than or equal to 2 and less than or equal to 4. However, in equations (13) to (20), when θ = 0 radians, the number of signal points in the in-phase I-quadrature Q plane of the transmitted signal is 2.

[0244] Sending Method #6:

[0245] The number of signal points in the in-phase I-quadrature Q plane of the transmitted signal is greater than or equal to 4 and less than or equal to 16. However, in equations (13) to (20), when θ=0 radians, the number of signal points in the in-phase I-quadrature Q plane of the transmitted signal is 4.

[0246] Sending Method #7:

[0247] The number of signal points in the in-phase I-quadrature Q plane of the transmitted signal is greater than or equal to 4 and less than or equal to 64. However, in equations (13) to (20), when θ = 0 radians, the number of signal points in the in-phase I-quadrature Q plane of the first transmitted signal is 4, and the number of signal points in the in-phase I-quadrature Q plane of the second transmitted signal is 16.

[0248] Sending Method #8:

[0249] The number of signal points in the in-phase I-quadrature Q plane of the transmitted signal is greater than or equal to 16 and less than or equal to 256. However, in equations (13) to (20), when θ=0 radians, the number of signal points in the in-phase I-quadrature Q plane of the transmitted signal is 16.

[0250] Sending Method #9:

[0251] The number of signal points in the in-phase I-quadrature Q plane of the transmitted signal is greater than or equal to 64 and less than or equal to 4096. However, in equations (13) to (20), when θ=0 radians, the number of signal points in the in-phase I-quadrature Q plane of the transmitted signal is 64.

[0252] As mentioned above, Figure 1 The maximum number of signal points when the transmitting device sends a single-stream modulated signal is 64.

[0253] By the way, considering Figure 1In the case of the influence of phase noise in the RF (Radio Frequency) section of the wireless sections 107_A and 107_B of the transmitting device and the influence of nonlinear distortion in the transmitting power amplifiers of the wireless sections 107_A and 107_B, it is preferable to adopt a modulation method with a smaller PAPR (Peak-to-Average Power Ratio) and a modulation method with a signal point configuration having a smaller influence of phase noise. If this is taken into consideration, it is preferable to reduce the number of signal points in the in-phase I-quadrature Q plane contained in the transmitting signal (modulated signal). As described above, in the case of a transmitting device that can select multiple transmitting methods, by suppressing the number of signal points in the in-phase I-quadrature Q plane in the transmitting method having the largest number of signal points in the in-phase I-quadrature Q plane to a smaller number, the influence of the phase noise of the RF section can be suppressed in the transmitting device. In addition, since the influence of the nonlinear distortion in the transmitting power amplifier can be suppressed, the receiving signal is reduced. Figure 1 In the receiving device of the modulated signal sent by the transmitting device, the effect of improving the reception quality of the data can be obtained. Figure 1 In the case of a modulated signal in which the influence of the phase noise of the RF unit and the influence of the nonlinear distortion of the transmitting power amplifier are small when the transmitting device transmits the signal, the circuit scale of the RF unit and the transmitting power amplifier in the transmitting device can be reduced (if the PAPR varies greatly according to the modulation method, for example, the circuit scale increases by preparing the RF unit and the transmitting power amplifier according to the modulation method).

[0254] As described above, Figure 1 The maximum number of signal points when transmitting a single-stream modulated signal is set to 64. Figure 1 When the maximum number of signal points when the sending device sends the modulated signals of two streams is suppressed to 64, the effect described above can be obtained.

[0255] On the other hand, when Figure 1 When the transmitting device sends two streams of modulated signals, if the signal of s1(i) is sent using multiple antennas and the signal of s2(i) is sent using multiple antennas, the effect of transmit diversity can be obtained, so the receiving Figure 1 The receiving device of the modulated signal sent by the transmitting device can obtain the effect of improving the reception quality of data. However, in order to obtain this effect, Figure 1 It is important that the modulated signal transmitted by the transmitting device has little influence on the phase noise of the RF unit and the influence of nonlinear distortion in the transmitting power amplifier.

[0256] Following the above, consider the first option or the second option.

[0257] Method 1:

[0258] Figure 1 The transmitting device switches the transmission method of the modulated signal based on the information of the transmission method included in the control signal 100. At this time, Figure 1 The sending device can select the following sending methods.

[0259] Sending method #1-1:

[0260] The modulation mode of transmitting a single stream (s1(i)) is set to BPSK (or π / 2 shift BPSK) (wherein the modulation signal of a single stream can be transmitted using one antenna or multiple antennas).

[0261] Sending method #1-2:

[0262] The modulation mode of transmitting a single stream (s1(i)) is set to QPSK (or π / 2 phase shift QPSK) (wherein the modulated signal of a single stream can be transmitted using one antenna or multiple antennas).

[0263] Sending Methods #1-3:

[0264] The modulation method for transmitting a single stream (s1(i)) is set to 16QAM (or π / 2 phase-shifted 16QAM) (or a modulation method such as 16APSK in which there are 16 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0265] Sending Methods #1-4:

[0266] The modulation method for transmitting a single stream (s1(i)) is set to 64QAM (or π / 2 phase-shifted 64QAM) (or a modulation method such as 64APSK in which there are 64 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0267] Sending Methods #1-5:

[0268] The modulation method of s1(i) is set to BPSK (or π / 2 phase shift BPSK) when transmitting two streams (s1(i) and s2(i)), and the modulation method of s2(i) is set to BPSK (or π / 2 phase shift BPSK). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas. In addition, the two streams are based on Figure 2 、 Figure 3 , use one of the (precoding) matrices of equations (13) to (20) for precoding (weighted synthesis), and then perform phase change (by the phase change unit 205B) and transmit (in addition, it is also possible not to perform phase change, and there is also a case where coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than 2π radians (0 radians ≤ θ < 2π radians)).

[0269] Sending Methods #1-6:

[0270] The modulation method of s1(i) is set to QPSK (or π / 2 shift QPSK) for transmitting two streams (s1(i) and s2(i)), and the modulation method of s2(i) is set to QPSK (or π / 2 shift QPSK). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas. In addition, the two streams are based on Figure 2 、 Figure 3 Precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by the phase change unit 205B) and the signal is transmitted (in addition, the phase change may not be performed, and coefficient multiplication may be performed (by the coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0271] Sending Methods #1-7:

[0272] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to QPSK (or π / 2 phase shift QPSK), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3Precoding (weighted synthesis) is performed using a (precoding) matrix of equations (13) to (20), and then, phase change is performed (by phase change unit 205B) and transmitted. (In addition, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), if θ≠0 radians (in addition, θ is greater than 0 radians and less than 2π radians (0 radians ≤ θ < 2π radians)) (θ = π / 4 radians (45 degrees), then the average transmission power of the modulated signal transmitted from each antenna is equal).

[0273] Sending Methods #1-8:

[0274] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , use one of the (precoding) matrices of equations (13) to (20) for precoding (weighted synthesis), then perform phase change (by the phase change unit 205B) and send (in addition, it is also possible not to perform phase change, and there are also cases where coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is set that θ = 0 radians (in addition, θ is greater than 0 radians and less than 2π radians (0 radians ≤ θ < 2π radians)).

[0275] Sending Methods #1-9:

[0276] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , using one of the (precoding) matrices of equations (13) to (20), precoding (weighted synthesis) is performed, and then (by the phase change unit 205B) a phase change is performed and transmitted. (Also, it is also possible not to perform a phase change, and there are also cases where coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ = 0 radians (in addition, θ is greater than 0 radians and less than 2π radians (0 radians ≤ θ < 2π radians)).

[0277] Furthermore, the first selection method does not need to support all of the transmission methods from transmission method #1-1 to transmission method #1-9. For example, the first selection method only needs to support at least one of the three transmission methods #1-5, #1-6, and #1-7. Furthermore, the first selection method only needs to support at least one of the two transmission methods #1-8 and #1-9.

[0278] In addition, in the first selection method, it is not necessary to correspond to the transmission method #1-1. (In the first selection method, Figure 1 The selection candidates for the sending method of the sending device do not include sending method #1-1).

[0279] The first selection method may include transmission methods other than transmission method #1-1 to transmission method #1-9.

[0280] At this time, the following is satisfied.

[0281] Sending method #1-1:

[0282] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is two.

[0283] Sending method #1-2:

[0284] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is four.

[0285] Sending Methods #1-3:

[0286] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 16.

[0287] Sending Methods #1-4:

[0288] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 64.

[0289] Sending Methods #1-5:

[0290] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 2 and less than or equal to 4. This allows for a transmission diversity effect.

[0291] Sending Methods #1-6:

[0292] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 4 and less than or equal to 16. This allows for a transmission diversity effect.

[0293] Sending Methods #1-7:

[0294] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 4 and less than or equal to 64. This allows for the effect of transmission diversity.

[0295] Sending Methods #1-8:

[0296] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 16.

[0297] Sending Methods #1-9:

[0298] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 64.

[0299] With the above characteristics, therefore, by setting it as the first selection method, Figure 1 In the transmitting device of the RF part, the influence of the phase noise can be reduced, and the influence of the nonlinear distortion in the transmission power amplifier can be reduced. In addition, in the transmission methods #1-5 to #1-7, the effect of transmission diversity can be obtained. Figure 1 In the receiving device that receives the modulated signal sent by the transmitting device, the data reception quality can be improved.

[0300] Second option:

[0301] Sending method #2-1:

[0302] The modulation mode of transmitting a single stream (s1(i)) is set to BPSK (or π / 2 shift BPSK) (wherein the modulation signal of a single stream can be transmitted using one antenna or multiple antennas).

[0303] Sending method #2-2:

[0304] The modulation mode of transmitting a single stream (s1(i)) is set to QPSK (or π / 2 phase shift QPSK) (wherein the modulated signal of a single stream can be transmitted using one antenna or multiple antennas).

[0305] Sending Method #2-3:

[0306] The modulation method for transmitting a single stream (s1(i)) is set to 16QAM (or π / 2 phase-shifted 16QAM) (or a modulation method such as 16APSK in which there are 16 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0307] Sending Methods #2-4:

[0308] The modulation method for transmitting a single stream (s1(i)) is set to 64QAM (or π / 2 phase-shifted 64QAM) (or a modulation method such as 64APSK in which there are 64 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0309] Sending Methods #2-5:

[0310] The modulation method of s1(i) is set to BPSK (or π / 2 phase shift BPSK) when transmitting two streams (s1(i) and s2(i)), and the modulation method of s2(i) is set to BPSK (or π / 2 phase shift BPSK). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0311] The precoding process here will be described.

[0312] exist Figure 1 In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0313] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0314] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0315] Sending Method #2-6:

[0316] The modulation method of s1(i) is set to QPSK (or π / 2 shift QPSK) for transmitting two streams (s1(i) and s2(i)), and the modulation method of s2(i) is set to QPSK (or π / 2 shift QPSK). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0317] The precoding process here will be described.

[0318] exist Figure 1 In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0319] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0320] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0321] Sending Method #2-7:

[0322] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to QPSK (or π / 2 phase shift QPSK), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , use one of the (precoding) matrices of equations (13) to (20) for precoding (weighted synthesis), and then perform phase change (by the phase change unit 205B) and send. (In addition, there is also a case where the phase change is not performed, and coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than 0 radians and less than 2π radians (0 radians ≤ θ < 2π radians)). If it is set to (θ = π / 4 radians (45 degrees), the average transmission power of the modulated signal sent from each antenna is equal).

[0323] Sending Method #2-8:

[0324] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices of equations (13) to (20), and then, phase change is performed (by the phase change unit 205B) and transmitted. (Also, it is also possible not to perform phase change, and there are also cases where coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ = 0 radians (although θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0325] Sending Method #2-9:

[0326] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices of equations (13) to (20), and then, phase change is performed (by the phase change unit 205B) and transmitted. (Also, it is also possible not to perform phase change, and there are also cases where coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ = 0 radians (although θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0327] Furthermore, the second selection method does not need to support all of the transmission methods from transmission method #2-1 to transmission method #2-9. For example, the second selection method only needs to support at least one of the three transmission methods #2-5, #2-6, and #2-7. Furthermore, the second selection method only needs to support at least one of the two transmission methods #2-8 and #2-9.

[0328] In addition, in the second selection method, it is not necessary to correspond to the transmission method #2-1. (In the second selection method, Figure 1 The selection candidates for the sending method of the sending device do not include sending method #2-1).

[0329] The second selection method may include transmission methods other than transmission method #2-1 to transmission method #2-9.

[0330] At this time, the following is satisfied.

[0331] Sending method #2-1:

[0332] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is two.

[0333] Sending method #2-2:

[0334] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is four.

[0335] Sending Method #2-3:

[0336] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 16.

[0337] Sending Methods #2-4:

[0338] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 64.

[0339] Sending Methods #2-5:

[0340] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 2 and not more than 4. There are cases where the effect of transmission diversity can be obtained.

[0341] Sending Method #2-6:

[0342] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 4 and not more than 16. There are cases where the effect of transmission diversity can be obtained.

[0343] Sending Method #2-7:

[0344] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 4 and less than or equal to 64. This allows for the effect of transmission diversity.

[0345] Sending Method #2-8:

[0346] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 16.

[0347] Sending Method #2-9:

[0348] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 64.

[0349] With the above characteristics, therefore, by setting it as the second selection method, Figure 1 In the transmitting device of , the influence of the phase noise of the RF part and the influence of the nonlinear distortion in the transmission power amplifier can be reduced. In addition, in the transmission methods #2-5 to #2-7, the effect of transmission diversity can be obtained. Figure 1 In the receiving device that receives the modulated signal sent by the transmitting device, the data reception quality can be improved.

[0350] Alternatively, a third selection method may be a combination of the first selection method and the second selection method.

[0351] Option 3:

[0352] Figure 1The transmitting device is a structure that switches the transmission method of the modulated signal based on the information of the transmission method included in the control signal 100. In this case, Figure 1 The following delivery methods can be selected.

[0353] Sending method #3-1:

[0354] The modulation mode of transmitting a single stream (s1(i)) is set to BPSK (or π / 2 shift BPSK) (wherein the modulation signal of a single stream can be transmitted using one antenna or multiple antennas).

[0355] Sending method #3-2:

[0356] The modulation mode of transmitting a single stream (s1(i)) is set to QPSK (or π / 2 phase shift QPSK) (wherein the modulated signal of a single stream can be transmitted using one antenna or multiple antennas).

[0357] Sending method #3-3:

[0358] The modulation method for transmitting a single stream (s1(i)) is set to 16QAM (or π / 2 phase-shifted 16QAM) (or a modulation method such as 16APSK in which there are 16 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0359] Sending Method #3-4:

[0360] The modulation method for transmitting a single stream (s1(i)) is set to 64QAM (or π / 2 phase-shifted 64QAM) (or a modulation method such as 64APSK in which there are 64 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0361] Sending Methods #3-5:

[0362] One of the delivery methods #1-5 or #2-5.

[0363] Sending Methods #3-6:

[0364] One of the sending methods #1-6 or #2-6.

[0365] Sending Methods #3-7:

[0366] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to QPSK (or π / 2 phase shift QPSK), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0367] Sending Method #3-8:

[0368] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices of equations (13) to (20), and then, phase change is performed (by the phase change unit 205B) and transmitted. (Also, it is also possible not to perform phase change, and there are also cases where coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ = 0 radians (although θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0369] Sending Method #3-9:

[0370] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices of equations (13) to (20), and then, phase change is performed (by the phase change unit 205B) and transmitted. (Also, it is also possible not to perform phase change, and there are also cases where coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ = 0 radians (although θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0371] Furthermore, the third selection method does not need to support all of the transmission methods #3-1 through #3-9. For example, the third selection method only needs to support at least one of the three transmission methods #3-5, #3-6, and #3-7. Furthermore, the third selection method only needs to support at least one of the two transmission methods #3-8 and #3-9.

[0372] In addition, in the third selection method, it is also possible not to correspond to the transmission method #3-1. (In the third selection method, Figure 1 The selection candidates for the sending method of the sending device do not include sending method #3-1).

[0373] The third selection method may include transmission methods other than transmission method #3-1 to transmission method #3-9.

[0374] By setting it as the third selection method, Figure 1 In the transmitting device of , the influence of the phase noise of the RF part and the influence of the nonlinear distortion in the transmission power amplifier can be reduced. In addition, in the transmission methods #3-5 to #3-7, the effect of transmission diversity can be obtained. Figure 1 In the receiving device that receives the modulated signal sent by the transmitting device, the data reception quality can be improved.

[0375] Figure 5 yes Figure 1 The transmitting device is OFDM (Orthogonal Frequency Division Multiplexing) Figure 1 An example of the structure of the wireless units 107_A and 107_B. The serial-to-parallel converter 502 uses the signal 501 and the control signal 500 (equivalent to Figure 1 The control signal 100 is input, and serial-parallel conversion is performed based on the control signal 500, and the signal 503 after serial-parallel conversion is output.

[0376] The inverse Fourier transform unit 504 receives the serial-to-parallel converted signal 503 and the control signal 500 as input, performs an inverse Fourier transform (eg, inverse fast Fourier transform (IFFT)) based on the control signal 500 , and outputs an inverse Fourier transformed signal 505 .

[0377] The processing unit 506 receives the inverse Fourier transformed signal 505 and the control signal 500 as input, performs frequency conversion, amplification and other processing based on the control signal 500 , and outputs a modulated signal 507 .

[0378] (For example, if signal 501 is Figure 1 In the case of the signal 106_A after signal processing, the modulated signal 507 is equivalent to Figure 1 Furthermore, when signal 501 is Figure 1 In the case of the signal 106_B after signal processing, the modulated signal 507 is equivalent to Figure 1 sending signal 108_B).

[0379] Figure 6 yes Figure 1 The frame structure of the transmitted signal 108_A. Figure 6 In the figure, the horizontal axis is frequency (carrier) and the vertical axis is time. Since a multi-carrier transmission method such as OFDM is used, there are symbols in the carrier direction. Figure 6 In , the symbols from carrier 1 to carrier 36 are shown. In addition, Figure 6 In it, it represents the code element from time $1 to time $11.

[0380] Figure 6 601 represents the pilot symbol (equivalent to Figure 2 、 Figure 3602 represents a data symbol, and 603 represents other symbols. In this case, the pilot symbol is, for example, a PSK (Phase Shift Keying) symbol, which is used by a receiving device receiving the frame to perform channel estimation (estimation of transmission path fluctuations) and frequency offset / phase fluctuation estimation. For example, Figure 1 The sending device and receiving Figure 6 A method for sending pilot code elements shared by receiving devices of frames.

[0381] By the way, the mapped signal 201A ( Figure 1 The mapped signal 105_1) is named "stream #1", and the mapped signal 201B ( Figure 1 The mapped signal 105_2) is named "stream #2". In addition, this point is the same in the subsequent description.

[0382] Data symbol 602 is equivalent to Figure 2 、 Figure 3 Therefore, data symbol 602 is either "a symbol including both symbols from 'stream #1' and symbols from 'stream #2'," "a symbol from 'stream #1'," or "a symbol from 'stream #2'," depending on the configuration of the precoding matrix used in weighted combination section 203. (That is, data symbol 602 corresponds to signal 204A (z1(i)) after weighted combination).

[0383] Assume that the other code element 603 is equivalent to Figure 2 、 Figure 3 The preamble 252 and the control information codeword signal 253 in the transmission are symbols (wherein, other symbols may also include symbols other than the preamble and the control information codeword). In this case, the preamble may also transmit (control) data and is composed of symbols for signal detection, symbols for frequency synchronization / time synchronization, and symbols for channel estimation (symbols for estimating transmission path variations). Furthermore, the control information codeword is a symbol containing the received Figure 6 The receiving device of the frame implements demodulation / decoding of the data codewords and the control information codewords.

[0384] For example, Figure 6From time $1 to time $4, carriers 1 to 36 are other symbols 603. Furthermore, from carrier 1 to 11 at time $5, data symbols 602 are formed. Subsequently, carrier 12 at time $5 becomes a pilot symbol 601, from carrier 13 to 23 at time $5 becomes a data symbol 602, from carrier 24 at time $5 becomes a pilot symbol 601, ..., from carrier 1 and 2 at time $6 become data symbols 602, from carrier 3 at time $6 becomes a pilot symbol 601, ..., from carrier 30 at time $11 becomes a pilot symbol 601, and from carrier 31 to 36 at time $11 becomes a data symbol 602.

[0385] Figure 7 yes Figure 1 The frame structure of the transmitted signal 108B. Figure 7 In the figure, the horizontal axis is frequency (carrier) and the vertical axis is time. Since a multi-carrier transmission method such as OFDM is used, there are symbols in the carrier direction. Figure 7 In , the symbols from carrier 1 to carrier 36 are shown. In addition, Figure 7 In , the code elements from time $1 to time $11 are represented.

[0386] Figure 7 701 represents the pilot symbol (equivalent to Figure 2 、 Figure 3 702 represents a data symbol, and 703 represents other symbols. In this case, the pilot symbol is, for example, a PSK symbol, which is used by the receiving device receiving the frame to perform channel estimation (estimation of transmission path fluctuations) and frequency offset / phase fluctuation estimation. For example, Figure 1 The sending device and receiving Figure 7 The receiving device of the frame can share the method of sending pilot code elements.

[0387] Data symbol 702 is equivalent to Figure 2 、 Figure 3 Therefore, data symbol 702 is either "a symbol including both symbols from 'stream #1' and symbols from 'stream #2'," "a symbol from 'stream #1'," or "a symbol from 'stream #2'," depending on the configuration of the precoding matrix used in weighted combination section 203. (That is, data symbol 702 corresponds to signal 206B (z2(i)) after phase change.)

[0388] The other code element 703 is equivalent to Figure 2 、 Figure 3The preamble 252 and the control information codeword signal 253 in the transmission are symbols (wherein, other symbols may also include symbols other than the preamble and the control information codeword). In this case, the preamble may also transmit (control) data and is composed of symbols for signal detection, symbols for frequency synchronization / time synchronization, and symbols for channel estimation (symbols for estimating transmission path variations). Furthermore, the control information codeword is a symbol containing the received Figure 7 The receiving device of the frame implements demodulation / decoding of the data codewords and the control information codewords.

[0389] For example, Figure 7 From time $1 to time $4, carriers 1 to 36 are other symbols 703. Furthermore, from carrier 1 to 11 at time $5, data symbols 702 are formed. Subsequently, carrier 12 at time $5 becomes pilot symbol 701, from carrier 13 to 23 at time $5 becomes data symbol 702, from carrier 24 at time $5 becomes pilot symbol 701, ..., from carrier 1 and 2 at time $6 become data symbols 702, from carrier 3 at time $6 becomes pilot symbol 701, ..., from carrier 30 at time $11 becomes pilot symbol 701, and from carrier 31 to 36 at time $11 becomes data symbol 702.

[0390] When Figure 6 There is a code element at carrier A and time $B. Figure 7 When the carrier A and the code element exist at time $B, Figure 6 Carrier A, symbol at time $B and Figure 5 The carrier A and the symbol at time $B are sent at the same time and frequency. Figure 6 、 Figure 7 , Figure 6 、 Figure 7 It is just an example of the frame structure.

[0391] and, Figure 6 、 Figure 7 The other code elements in are equivalent to " Figure 2 、 Figure 3 The preamble 252 in the code element, the control code element 253" is, therefore, Figure 6 The other symbols 603 of the same time and the same frequency (same carrier) Figure 7 The other codewords 703 transmit the same data (the same control information) when transmitting control information.

[0392] In addition, it is assumed that the receiving device receives Figure 6 Frame and Figure 7 Frames, but if only Figure 6 Frame or Figure 7The receiving device can also obtain the data sent by the sending device through the frame.

[0393] Figure 8 Indicates the use to generate Figure 2 、 Figure 3 An example of the structure of the control information generating portion of the control information codeword signal 253.

[0394] The control information mapping unit 802 takes the control information data 801 and the control signal 800 as input, maps the control information data 801 using a modulation method based on the control signal 800, and outputs the control information mapped signal 803. Figure 2 、 Figure 3 control information codeword signal 253.

[0395] Figure 9 express Figure 1 An example of the structure of antenna part #A (109_A) and antenna #B (109_B) (an example in which antenna part #A (109_A) and antenna part #B (109_B) are composed of multiple antennas).

[0396] The distribution unit 902 receives the transmission signal 901 as input, distributes it, and outputs transmission signals 903_1, 903_2, 903_3, and 903_4.

[0397] The multiplication unit 904_1 receives the transmission signal 903_1 and the control signal 900 as input, multiplies the transmission signal 903_1 by the multiplication coefficient based on the information of the multiplication coefficient included in the control signal 900, outputs the multiplied signal 905_1, and outputs the multiplied signal 905_1 as a radio wave from the antenna 906_1.

[0398] If the transmitted signal 903_1 is Tx1(t) (t: time) and the multiplication coefficient is W1 (W1 can be defined by a complex number and thus can also be a real number), the signal 905_1 after the multiplication operation is expressed as Tx1(t)×W1.

[0399] The multiplication unit 904_2 receives the transmission signal 903_2 and the control signal 900 as input, multiplies the transmission signal 903_2 by the multiplication coefficient based on the information of the multiplication coefficient included in the control signal 900, outputs the multiplied signal 905_2, and outputs the multiplied signal 905_2 as a radio wave from the antenna 906_2.

[0400] If the transmitted signal 903_2 is Tx2(t) and the multiplication coefficient is W2 (W2 can be defined by a complex number and thus can also be a real number), the signal 905_2 after the multiplication operation is expressed as Tx2(t)×W2.

[0401] The multiplication unit 904_3 receives the transmission signal 903_3 and the control signal 900 as input, multiplies the transmission signal 903_3 by the multiplication coefficient based on the information of the multiplication coefficient included in the control signal 900, outputs the multiplied signal 905_3, and outputs the multiplied signal 905_3 as a radio wave from the antenna 906_3.

[0402] If the transmitted signal 903_3 is Tx3(t) and the multiplication coefficient is W3 (W3 can be defined by a complex number and thus can also be a real number), the signal 905_3 after the multiplication operation is expressed as Tx3(t)×W3.

[0403] The multiplication unit 904_4 receives the transmission signal 903_4 and the control signal 900 as input, multiplies the transmission signal 903_4 by the multiplication coefficient based on the information of the multiplication coefficient included in the control signal 900, outputs the multiplied signal 905_4, and outputs the multiplied signal 905_4 as a radio wave from the antenna 906_4.

[0404] If the transmitted signal 903_4 is Tx4(t) and the multiplication coefficient is W4 (W4 can be defined by a complex number and thus can also be a real number), the signal 905_4 after the multiplication operation is expressed as Tx4(t)×W4.

[0405] Alternatively, the absolute values ​​of W1, W2, W3, and W4 can be equal. This is equivalent to a phase change. (Of course, the absolute values ​​of W1, W2, W3, and W4 do not have to be equal.)

[0406] In addition, Figure 9 In the embodiment, the example in which the antenna unit is composed of 4 antennas (and 4 multiplication units) is used for explanation, but the number of antennas is not limited to 4, as long as it is composed of 2 or more antennas.

[0407] And, when Figure 1 The structure of antenna part #A (109_A) is as follows: Figure 9 When sending signal 901, it is equivalent to Figure 1 In addition, Figure 1 The structure of antenna part #B (109_B) is as follows: Figure 9 When sending signal 901, it is equivalent to Figure 1 The sending signal 108_B is equivalent to Figure 1 However, antenna part #A (109_A) and antenna part #B (109_B) may not be Figure 9In such a structure, as described above, the antenna unit does not need to take the control signal 100 as input. For example, Figure 1 The antenna part #A (109_A) and the antenna part #B (109_B) can be composed of one antenna or multiple antennas.

[0408] Figure 10 yes Figure 1 An example of the frame structure of the transmission signal 108_A. Figure 10 , the horizontal axis is time. Figure 10 and Figure 6 The difference is Figure 10 The frame structure of is an example of a frame structure in a single carrier mode, where there are symbols in the time direction. Figure 10 In , the codewords from time t1 to t22 are represented.

[0409] Figure 10 The preamble 1001 is equivalent to Figure 2 、 Figure 3 In this case, the preamble signal 252 may be used to transmit data (for control), or may be composed of symbols for signal detection, symbols for frequency synchronization / time synchronization, symbols for channel estimation (symbols for estimating transmission path variations), and the like.

[0410] Figure 10 The control information symbol 1002 is equivalent to Figure 2 、 Figure 3 The code element of the control information code element signal 253 in the received Figure 10 The receiving device of the frame is a codeword containing control information used to implement demodulation / decoding of data codewords.

[0411] Figure 10 The pilot symbol 1004 is equivalent to Figure 2 、 Figure 3 The pilot symbol 1004 is a symbol of the pilot signal 251A (pa (t)), for example, a PSK symbol, and is used by the receiving device receiving the frame to perform channel estimation (estimation of transmission path variation), frequency offset estimation / phase variation estimation, for example, Figure 1 The sending device and receiving Figure 10 The receiving device of the frame can share the method of sending pilot code elements.

[0412] and, Figure 10 1003 is a data symbol used to transmit data.

[0413] The mapped signal 201A ( Figure 1 The mapped signal 105_1) is named "stream #1", and the mapped signal 201B ( Figure 1 The mapped signal 105_2) is named "stream #2".

[0414] Data symbol 1003 is equivalent to Figure 2 、 Figure 3 Therefore, data symbol 1003 is either "a symbol including both symbols from 'stream #1' and symbols from 'stream #2'," "a symbol from 'stream #1'," or "a symbol from 'stream #2'," depending on the configuration of the precoding matrix used in weighted combination section 203. (That is, data symbol 1003 corresponds to signal 204A (z1(i)) after weighted combination).

[0415] In addition, Figure 10 Although not described in the specification, a frame may also include symbols other than preamble, control information symbols, data symbols, and pilot symbols.

[0416] For example, the sending device Figure 10 The preamble 1001 is sent at time t1, the control information symbol 1002 is sent at time t2, the data symbol 1003 is sent from time t3 to t11, the pilot symbol 1004 is sent at time t12, the data symbol 1003 is sent from time t13 to t21, and the pilot symbol 1004 is sent at time t22.

[0417] Figure 11 yes Figure 1 An example of the frame structure of the transmission signal 108_B. Figure 11 , the horizontal axis is time. Figure 11 and Figure 7 The difference is Figure 11 The frame structure of is an example of a frame structure in a single carrier mode, and there are symbols in the time direction. Figure 11 In , the codewords from time t1 to t22 are represented.

[0418] Figure 11 The preamble 1101 is equivalent to Figure 2 、 Figure 3 The preamble signal 252 in the figure is a preamble. In this case, the preamble can also transmit (control) data and is composed of symbols for signal detection, symbols for frequency synchronization / time synchronization, and symbols for channel estimation (symbols for estimating transmission path fluctuations).

[0419] Figure 11 The control information symbol 1102 is equivalent to Figure 2 、 Figure 3 The control information code element signal 253 in the code element contains the received Figure 11The receiving device of the frame is used to implement the demodulation / decoding of the data codewords and the codewords of the control information.

[0420] Figure 11 The pilot symbol 1104 is equivalent to Figure 2 、 Figure 3 The pilot symbol 1104 is a symbol of the pilot signal 251B (pb (t)), for example, a PSK symbol, which is used by the receiving device receiving the frame to perform channel estimation (estimation of transmission path variation), frequency offset estimation / phase variation estimation, for example, Figure 1 The sending device and receiving Figure 11 A method for sending pilot code elements shared by receiving devices of frames.

[0421] and, Figure 11 1103 is a data symbol used to transmit data.

[0422] The mapped signal 201A ( Figure 1 The mapped signal 105_1) is named "stream #1", and the mapped signal 201B ( Figure 1 The mapped signal 105_2) is named "stream #2".

[0423] Data symbol 1103 is equivalent to Figure 2 、 Figure 3 Therefore, data symbol 1103 is either "a symbol including both symbols from 'stream #1' and symbols from 'stream #2'," "a symbol from 'stream #1'," or "a symbol from 'stream #2'," depending on the configuration of the precoding matrix used in weighted combination section 203. (That is, data symbol 1103 corresponds to signal 206B (z2(i)) after phase change.)

[0424] In addition, Figure 11 Although not described in the specification, a frame may also include symbols other than preamble, control information symbols, data symbols, and pilot symbols.

[0425] For example, the sending device Figure 11 The preamble 1101 is sent at time t1, the control information symbol 1102 is sent at time t2, the data symbol 1103 is sent from time t3 to t11, the pilot symbol 1104 is sent at time t12, the data symbol 1103 is sent from time t13 to t21, and the pilot symbol 1104 is sent at time t22.

[0426] When Figure 10 At the moment tp, there is a code element, Figure 10 When a symbol exists at time tp (p is an integer greater than 1), Figure 10The code element and Figure 11 The symbols at time tp are sent at the same time and frequency. (For example, Figure 10 The data symbol at time t3 and Figure 11 The data symbol at time t3 is transmitted at the same time and frequency. ) In addition, the frame structure is not limited to Figure 10 、 Figure 11 , Figure 10 、 Figure 11 It is just an example of the frame structure.

[0427] and, Figure 10 、 Figure 11 The preamble and control information symbols in the can also be a method of transmitting the same data (the same control information).

[0428] In addition, it is assumed that the receiving device will Figure 10 Frame and Figure 11 Frames are received simultaneously, but even if only Figure 10 Frame or Figure 11 The receiving device can also obtain the data sent by the sending device through the frame.

[0429] Figure 12 An example of a method of arranging code elements on the time axis of the weighted combined signal 204A (z1(i)) and the phase-changed signal 206B (z2(i)) is shown.

[0430] exist Figure 12 In this case, p is 1 or 2. Figure 12 zp(0) means "z1(0), z2(0) when symbol number i=0 in z1(i), z2(i). Similarly, zp(1) means "z1(1), z2(1) when symbol number i=1 in z1(i), z2(i). (That is, zp(X) means "z1(X), z2(X) when symbol number i=X in z1(i), z2(i).) Figure 13 、 Figure 14 、 Figure 15 The same is true.

[0431] like Figure 12 As shown, the symbols zp(0) with symbol number i=0 are arranged at time 0, the symbol zp(1) with symbol number i=1 is arranged at time 1, the symbol zp(2) with symbol number i=2 is arranged at time 2, the symbol zp(3) with symbol number i=3 is arranged at time 3, ..., and the symbols of the signal 204A (z1(i)) after weighted synthesis and the signal 206B (z2(i)) after phase change are arranged on the time axis. However, Figure 12This is just an example, and the relationship between the symbol number and the time is not limited to this.

[0432] Figure 13 An example of a method of arranging code elements on the frequency axis of the weighted combined signal 204A (z1(i)) and the phase-changed signal 206B (z2(i)) is shown.

[0433] like Figure 13 As shown, the symbol zp(0) with symbol number i=0 is arranged on carrier 0, the symbol zp(1) with symbol number i=1 is arranged on carrier 1, the symbol zp(2) with symbol number i=2 is arranged on carrier 2, the symbol zp(3) with symbol number i=3 is arranged on carrier 3, ..., and the weighted combined signal 204A (z1(i)) and the phase-changed signal 206B (z2(i)) are arranged on the frequency axis. However, Figure 13 This is just an example, and the relationship between the symbol number and the frequency is not limited to this.

[0434] Figure 14 An example of the arrangement of code elements on the time-frequency axis of the weighted combined signal 204A (z1(i)) and the phase-changed signal 206B (z2(i)) is shown.

[0435] like Figure 14 As shown, the symbol zp(0) with symbol number i=0 is arranged at time 0-carrier 0, the symbol zp(1) with symbol number i=1 is arranged at time 0-carrier 1, the symbol zp(2) with symbol number i=2 is arranged at time 1-carrier 0, the symbol zp(3) with symbol number i=3 is arranged at time 1-carrier 1, ..., and the weighted combined signal 204A (z1(i)) and the phase-changed signal 206B (z2(i)) are arranged on the time-frequency axis. However, Figure 14 This is just an example, and the relationship between symbol numbers and time-frequency is not limited to this.

[0436] Figure 15 An example of the arrangement of symbols of the weighted combined signal 204A (z1(i)) and the phase-changed signal 206B (z2(i)) with respect to time is shown. Figure 15 The example is expressed in Figure 1 Example of symbol arrangement when the radio units 107_A and 107_B include an interleaver (a portion that rearranges symbols). (Also, regarding the case where an interleaver (a portion that rearranges symbols) is included Figure 1 The structure of the wireless unit 107_A, 107_B uses Figure 18 (described later).

[0437] like Figure 15As shown, the symbols zp(0) with symbol number i=0 are arranged at time 0, the symbol zp(1) with symbol number i=1 is arranged at time 16, the symbol zp(2) with symbol number i=2 is arranged at time 12, the symbol zp(3) with symbol number i=3 is arranged at time 5, ..., and the symbols of the signal 204A (z1(i)) after weighted synthesis and the signal 206B (z2(i)) after phase change are arranged on the time axis. However, Figure 15 This is just an example, and the relationship between symbol numbers and time is not limited to this.

[0438] Figure 16 An example of the arrangement of symbols of the weighted combined signal 204A (z1(i)) and the phase-changed signal 206B (z2(i)) with respect to time is shown. Figure 16 The example is expressed in Figure 1 Example of symbol arrangement when the radio units 107_A and 107_B include an interleaver (a portion that rearranges symbols). (Also, regarding the case where an interleaver (a portion that rearranges symbols) is included Figure 1 The structure of the wireless unit 107_A, 107_B uses Figure 18 (described later).

[0439] like Figure 16 As shown, the symbol zp(0) with symbol number i=0 is arranged on carrier 0, the symbol zp(1) with symbol number i=1 is arranged on carrier 16, the symbol zp(2) with symbol number i=2 is arranged on carrier 12, the symbol zp(3) with symbol number i=3 is arranged on carrier 5, ..., and the weighted combined signal 204A (z1(i)) and the phase-changed signal 206B (z2(i)) are arranged on the time axis. However, Figure 16 This is just an example, and the relationship between the symbol number and the frequency is not limited to this.

[0440] Figure 17 An example of the arrangement of symbols of the weighted combined signal 204A (z1(i)) and the phase-changed signal 206B (z2(i)) with respect to time is shown. Figure 17 The example shows Figure 1 Example of symbol arrangement when the radio units 107_A and 107_B include an interleaver (a portion that rearranges symbols). (Also, regarding the case where an interleaver (a portion that rearranges symbols) is included Figure 1 The structure of the wireless unit 107_A, 107_B uses Figure 18 (described later).

[0441] like Figure 17As shown, the symbols zp(0) with symbol number i=0 are arranged at time 1-carrier 1, the symbol zp(1) with symbol number i=1 is arranged at time 3-carrier 3, the symbol zp(2) with symbol number i=2 is arranged at time 1-carrier 0, the symbol zp(3) with symbol number i=3 is arranged at time 1-carrier 3, ..., and the symbols of the signal 204A (z1(i)) after weighted synthesis and the signal 206B (z2(i)) after phase change are arranged on the time axis. However, Figure 17 This is just an example, and the relationship between symbol numbers and time-frequency is not limited to this.

[0442] Figure 18 Indicates Figure 1 An example of symbol arrangement when the wireless units 107_A and 107_B include an interleaver (a portion that rearranges symbols).

[0443] Interleaver (rearrangement unit) 1802 uses the signal 1801 (equivalent to Figure 1 105_1, 105_2), control signal 1800 (equivalent to Figure 1 100) as input, for example, according to the control signal 1800, the code element is rearranged and the rearranged signal 1803 is output. In addition, an example of the rearrangement of the code element is to use Figures 14 to 17 Explain that.

[0444] The signal processing unit 1804 takes the rearranged signal 1803 and the control signal 1800 as input, performs signal processing according to the control signal 1800, and outputs the processed signal 1805. For example, Figure 1 When the transmitting apparatus supports both the single-carrier method and the OFDM method, the signal processing unit 1804 performs signal processing of the single-carrier method or signal processing of the OFDM method based on the control signal 1800 .

[0445] The RF unit 1806 receives the signal 1805 after signal processing and the control signal 1800 as input, performs processing such as frequency conversion based on the control signal 1800 , and outputs a modulated signal 1807 .

[0446] The transmission power amplifier 1808 takes the modulated signal 1807 as input, amplifies the signal, and outputs the modulated signal 1809.

[0447] Figure 19 express Figure 1 The sending device sends, for example, Figure 6 、 Figure 7 The frame structure or Figure 10 、 Figure 11 An example of the structure of a receiving device that receives a modulated signal when a signal is transmitted.

[0448] The wireless unit 1903X takes the received signal 1902X received by the antenna unit #X (1901X) as input, performs processing such as frequency conversion and Fourier transform, and outputs a baseband signal 1904X.

[0449] Similarly, the wireless unit 1903Y takes the reception signal 1902Y received by the antenna unit #Y (1901Y) as input, performs processing such as frequency conversion and Fourier transform, and outputs a baseband signal 1904Y.

[0450] In addition, antenna part #X (1901X) and antenna part #Y (1901Y) are Figure 19 , the configuration in which the control signal 1910 is input is described, but a configuration other than the control signal 1910 may be used as input. The operation when the control signal 1910 is input will be described in detail later.

[0451] By the way, in Figure 20 The relationship between the sending device and the receiving device is shown in . Figure 20 Antennas 2001_1 and 2001_2 are transmitting antennas. Figure 20 Antenna 2001_1 is equivalent to Figure 1 Antenna section #A (109_A). And, Figure 20 Antenna 2001_2 is equivalent to Figure 1 Antenna part #B (109_B).

[0452] and, Figure 20 Antennas 2002_1 and 2002_2 are receiving antennas. Figure 20 Antenna 2002_1 is equivalent to Figure 19 The antenna of the ,, part #X(1901X). And, Figure 20 Antenna 2002_2 is equivalent to Figure 19 Antenna part #Y(1901Y).

[0453] like Figure 20 Thus, let the signal transmitted from transmitting antenna 2001_1 be u1(i), the signal transmitted from transmitting antenna 2001_2 be u2(i), the signal received by receiving antenna 2002_1 be r1(i), and the signal received by receiving antenna 2002_2 be r2(i). Furthermore, i represents a symbol number, for example, an integer greater than or equal to 0.

[0454] Furthermore, assuming that the transmission coefficient from transmitting antenna 2001_1 to receiving antenna 2002_1 is h11(i), the transmission coefficient from transmitting antenna 2001_1 to receiving antenna 2002_2 is h21(i), the transmission coefficient from transmitting antenna 2001_2 to receiving antenna 2002_1 is h12(i), and the transmission coefficient from transmitting antenna 2001_2 to receiving antenna 2002_2 is h22(i), the following relationship holds.

[0455] [Formula 46]

[0456]

[0457] In addition, n1(i) and n2(i) are noises.

[0458] Figure 19 The channel estimation unit 1905_1 of the modulated signal u1 takes the baseband signal 1904X as input and uses Figure 6 、 Figure 7 (or Figure 10 、 Figure 11 ) is used to perform channel estimation of the modulated signal u1, i.e., estimate h11(i) of equation (46), and output the channel estimation signal 1906_1.

[0459] The channel estimation unit 1905_2 of the modulated signal u2 takes the baseband signal 1904X as input and uses Figure 6 、 Figure 7 (or Figure 10 、 Figure 11 ) is used to perform channel estimation of the modulated signal u2, i.e., estimate h12(i) of equation (46), and output the channel estimation signal 1906_2.

[0460] The channel estimation unit 1907_1 of the modulated signal u1 takes the baseband signal 1904Y as input and uses Figure 6 、 Figure 7 (or Figure 10 、 Figure 11 ) is used to perform channel estimation of the modulated signal u1, i.e., estimate h21(i) of equation (46), and output the channel estimation signal 1908_1.

[0461] The channel estimation unit 1907_2 of the modulated signal u2 takes the baseband signal 1904Y as input and uses Figure 6 、 Figure 7 (or Figure 10 、 Figure 11 ) is used to perform channel estimation of the modulated signal u2, i.e., estimate h22(i) of equation (46), and output the channel estimation signal 1908_2.

[0462] The control information decoding unit 1909 takes the baseband signals 1904X and 1904Y as input and performs Figure 6 、 Figure 7 (or Figure 10 、 Figure 11 ) and outputs a control signal 1910 containing the control information.

[0463] The signal processing unit 1911 takes the channel estimation signals 1906_1, 1906_2, 1908_1, 1908_2, baseband signals 1904X, 1904Y, and control signal 1910 as input, utilizes the relationship of formula (46), and further performs demodulation / decoding based on the control information in the control signal 1910 (for example, information on the modulation method and the method of association with the error correction code), and outputs the received data 1912.

[0464] In addition, the control signal 1910 may not be Figure 19 For example, Figure 19 The control signal 1910 can also be based on Figure 8 The communication partner ( Figure 1 ) device, or it may be generated by Figure 19 The device includes an input unit and is generated based on information input from the input unit.

[0465] Figure 21 express Figure 19 An example of the structure of antenna unit #X (1901X) and antenna unit #Y (1901Y). (Antenna unit #X (1901X) and antenna unit #Y (1901Y) are examples of being composed of multiple antennas).

[0466] The multiplication unit 2103_1 receives the reception signal 2102_1 received by the antenna 2101_1 and the control signal 2100 as input, multiplies the reception signal 2102_1 by the multiplication coefficient based on the information of the multiplication coefficient included in the control signal 2100, and outputs a signal 2104_1 after the multiplication.

[0467] If the received signal 2102_1 is Rx1(t) (t: time) and the multiplication coefficient is D1 (D1 can be defined by a complex number and therefore can also be a real number), the signal 2104_1 after the multiplication operation is expressed as Rx1(t)×D1.

[0468] The multiplication unit 2103_2 receives the received signal 2102_2 received by the antenna 2101_2 and the control signal 2100 as input, multiplies the received signal 2102_2 by the multiplication coefficient based on the information of the multiplication coefficient included in the control signal 2100, and outputs the multiplied signal 2104_2.

[0469] If the received signal 2102_2 is Rx2(t) and the multiplication coefficient is D2 (D2 can be defined by a complex number and thus can also be a real number), then the signal 2104_2 after the multiplication operation is expressed as Rx2(t)×D2.

[0470] The multiplication unit 2103_3 receives the received signal 2102_3 received by the antenna 2101_3 and the control signal 2100 as input, multiplies the received signal 2102_3 by the multiplication coefficient based on the information of the multiplication coefficient included in the control signal 2100, and outputs a signal 2104_3 after the multiplication.

[0471] If the received signal 2102_3 is Rx3(t) and the multiplication coefficient is D3 (D3 can be defined by a complex number and thus can also be a real number), then the signal 2104_3 after the multiplication operation is expressed as Rx3(t)×D3.

[0472] The multiplication unit 2103_4 receives the received signal 2102_4 received by the antenna 2101_4 and the control signal 2100 as input, multiplies the received signal 2102_4 by the multiplication coefficient based on the information of the multiplication coefficient included in the control signal 2100, and outputs a signal 2104_4 after the multiplication.

[0473] If the received signal 2102_4 is assumed to be Rx4(t) and the multiplication coefficient is assumed to be D4 (D4 can be defined using a complex number and thus can also be a real number), the signal 2104_4 after the multiplication operation is expressed as Rx4(t)×D4.

[0474] The synthesizing unit 2105 receives the multiplied signals 2104_1, 2104_2, 2104_3, and 1004_4 as input, synthesizes the multiplied signals 2104_1, 2104_2, 2104_3, and 2104_4, and outputs a synthesized signal 2106. The synthesized signal 2106 is represented as Rx1(t)×D1+Rx2(t)×D2+Rx3(t)×D3+Rx4(t)×D4.

[0475] exist Figure 21 In the description, an example is given in which the antenna unit is composed of 4 antennas (and 4 multiplication units), but the number of antennas is not limited to 4, as long as it is composed of 2 or more antennas.

[0476] And, in Figure 19 The structure of the antenna part #X(1901X) is Figure 21 When the received signal 1902X is equivalent to Figure 21 The composite signal 2106, the control signal 1910 is equivalent to Figure 10The control signal 2100. In addition, Figure 19 The structure of the antenna part #Y (1901Y) is Figure 21 When the received signal 1902Y is equivalent to Figure 21 The composite signal 2106, the control signal 1910 is equivalent to Figure 21 control signal 2100.

[0477] However, the antenna part #X (1901X) and the antenna part #Y (1901Y) may not be Figure 21 In such a configuration, as described above, the antenna unit does not need to receive the control signal 1910 as input. Antenna unit #X (1901X) and antenna unit #Y (1901Y) may each be a single antenna.

[0478] Furthermore, the control signal 1900 may be generated based on information transmitted from a device serving as a communication partner, or the device may include an input unit and the control signal 1900 may be generated based on information input from the input unit.

[0479] Above, through Figure 1 The transmitting device transmits a modulated signal using the transmitting method shown in this embodiment. Figure 1 The modulated signal sent by the transmitting device is received Figure 19 The receiving device can reduce the influence of phase noise and nonlinear distortion, thereby improving the data reception quality.

[0480] In addition, as Figure 1 The modulation signal sent by the transmitting device may be a single-carrier modulation signal or a multi-carrier modulation signal such as an OFDM method. In addition, the modulation signal may adopt a spectrum diffusion communication method.

[0481] Also, you can Figure 1 The control signal 100 of the transmitting device includes control information for designating "single carrier transmission / multi-carrier transmission such as OFDM transmission". When the control signal 100 indicates "single carrier transmission", Figure 1 The transmitting device transmits a modulated signal in a single-carrier mode. When the control signal 100 indicates "transmission in a multi-carrier mode such as OFDM mode", Figure 1 The transmitting device transmits a modulated signal of a multi-carrier method such as OFDM. Figure 1 The signal is sent through Figure 19 The receiving device sends control information for designating "single-carrier transmission / multi-carrier transmission such as OFDM", Figure 19 The receiving device can Figure 1 The modulated signal sent is received and demodulated and decoded.

[0482] (Implementation Method 2)

[0483] In this embodiment, Figure 1 The following describes a point different from the first embodiment in that the transmitting apparatus can transmit both or one of a modulated signal of a single-carrier transmission method and a modulated signal of a multi-carrier transmission method such as an OFDM method.

[0484] In this embodiment, the following three types of transmitting devices can be considered.

[0485] 1st sending device:

[0486] The first transmitting device is a transmitting device that can selectively transmit both a single-carrier modulation signal and a multi-carrier transmission modulation signal such as an OFDM method. Figure 1 The control signal 100 of the transmitting device includes control information for designating "single carrier transmission / multi-carrier transmission such as OFDM transmission". Consider that when the control signal 100 indicates "single carrier transmission", Figure 1 The transmitting device transmits a modulated signal in a single-carrier mode. When the control signal 100 indicates "transmission in a multi-carrier mode such as OFDM mode", Figure 1 The transmitting device transmits a modulated signal of a multi-carrier method such as OFDM. Figure 1 The sending device is connected to Figure 19 The receiving device sends control information for designating "single-carrier transmission / multi-carrier transmission such as OFDM", Figure 19 The receiving device can Figure 1 The modulated signal sent by the transmitting device is received and demodulated and decoded.

[0487] Second sending device:

[0488] The second transmitting device is a transmitting device capable of transmitting a modulated signal in a single carrier mode. Figure 1 When the control signal 100 of the transmitting device includes control information for designating "single carrier transmission / multi-carrier transmission such as OFDM", only "single carrier transmission" can be selected as the control information. Figure 1 The transmitting device transmits a modulated signal in a single carrier mode. Figure 1 The sending device is connected to Figure 19 The receiving device sends control information for designating "single-carrier transmission / multi-carrier transmission such as OFDM", Figure 19 The receiving device can Figure 1 The modulated signal sent by the transmitting device is received and demodulated and decoded.

[0489] 3rd sending device:

[0490] The third transmitting device is a transmitting device capable of transmitting a modulated signal of a multi-carrier method such as OFDM. Figure 1 When the control signal 100 of the transmitting device includes control information for designating "single carrier transmission / multi-carrier transmission such as OFDM", only "multi-carrier transmission such as OFDM" can be selected as the control information. Figure 1 The transmitting device transmits a modulated signal of a multi-carrier method such as OFDM. Figure 1 The sending device is connected to Figure 19 The receiving device sends control information for "single-carrier transmission / multi-carrier transmission such as OFDM", Figure 19 The receiving device can Figure 1 The modulated signal sent by the transmitting device is received and demodulated and decoded.

[0491] In Implementation 1, the structure of the transmitting device, the structure of the receiving device that receives the modulated signal transmitted by the transmitting device, the frame structure example in the single-carrier mode, and the frame structure example in the multi-carrier transmission mode such as the OFDM mode have been described, so the description is omitted here.

[0492] In this embodiment, as a method for transmitting a modulated signal in a single-carrier mode, one of the "first selection method," "second selection method," or "third selection method" described in Embodiment 1 is adopted. Figure 1 The modulated signal is transmitted by the transmitting device of the second transmitting device. In this case, the second transmitting device can reduce the effects of phase noise in the RF unit and nonlinear distortion in the transmit power amplifier, achieving transmit diversity depending on the transmission method. Consequently, the receiving device receiving the modulated signal transmitted by the second transmitting device can achieve improved data reception quality.

[0493] Furthermore, in this embodiment, the following is considered as a method for transmitting a modulated signal using a multi-carrier transmission method such as the OFDM method.

[0494] 4th selection method:

[0495] Figure 1 The transmitting device switches the transmission method of the modulated signal based on the information of the transmission method included in the control signal 100. At this time, Figure 1 The sending device can select the following sending methods.

[0496] Sending method #4-1:

[0497] The modulation mode of transmitting a single stream (s1(i)) is set to BPSK (or π / 2 shift BPSK) (wherein the modulation signal of a single stream can be transmitted using one antenna or multiple antennas).

[0498] Sending method #4-2:

[0499] The modulation mode of transmitting a single stream (s1(i)) is set to QPSK (or π / 2 phase shift QPSK) (wherein the modulated signal of a single stream can be transmitted using one antenna or multiple antennas).

[0500] Sending method #4-3:

[0501] The modulation method for transmitting a single stream (s1(i)) is set to 16QAM (or π / 2 phase-shifted 16QAM) (or a modulation method such as 16APSK in which there are 16 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0502] Sending method #4-4:

[0503] The modulation method for transmitting a single stream (s1(i)) is set to 64QAM (or π / 2 phase-shifted 64QAM) (or a modulation method such as 64APSK in which there are 64 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0504] Sending Method #4-5:

[0505] The modulation method of s1(i) is set to BPSK (or π / 2 phase shift BPSK) when transmitting two streams (s1(i) and s2(i)), and the modulation method of s2(i) is set to BPSK (or π / 2 phase shift BPSK). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0506] Sending Methods #4-6:

[0507] The modulation method of s1(i) is set to QPSK (or π / 2 shift QPSK) for transmitting two streams (s1(i) and s2(i)), and the modulation method of s2(i) is set to QPSK (or π / 2 shift QPSK). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0508] Sending Methods #4-7:

[0509] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to QPSK (or π / 2 phase shift QPSK), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , use one of the (precoding) matrices of equations (13) to (20) for precoding (weighted synthesis), and then perform phase change (by the phase change unit 205B) and send. (In addition, there is also a case where the phase change is not performed, and coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than 0 radians and less than 2π radians (0 radians ≤ θ < 2π radians)). If it is set to (θ = π / 4 radians (45 degrees), the average transmission power of the modulated signal sent from each antenna is equal).

[0510] Sending Methods #4-8:

[0511] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0512] Sending Methods #4-9:

[0513] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0514] Or the modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). In this case, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices of equations (13) to (20), and then, phase change is performed (by the phase change unit 205B) and transmitted. (Also, it is also possible not to perform phase change, and there are also cases where coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ = 0 radians (although θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0515] Or the modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). In this case, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0516] The precoding process here will be described.

[0517] exist Figure 1In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0518] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0519] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0520] Furthermore, the fourth selection method does not necessarily need to support all of the transmission methods #4-1 through #4-9. For example, the fourth selection method only needs to support at least one of the three transmission methods #4-5, #4-6, and #4-7. Furthermore, the fourth selection method only needs to support at least one of the two transmission methods #4-8 and #4-9.

[0521] In addition, in the fourth selection method, it is not necessary to correspond to the transmission method #4-1. (In the fourth selection method, Figure 1 The selection candidates for the sending method of the sending device do not include sending method #4-1).

[0522] The fourth selection method may include transmission methods other than transmission methods #4-1 to #4-9.

[0523] At this time, the following is satisfied.

[0524] Sending method #4-1:

[0525] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is two.

[0526] Sending method #4-2:

[0527] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is four.

[0528] Sending method #4-3:

[0529] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 16.

[0530] Sending method #4-4:

[0531] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 64.

[0532] Sending Method #4-5:

[0533] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 2 and less than or equal to 4. This allows for a transmission diversity effect.

[0534] Sending Methods #4-6:

[0535] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 4 and less than or equal to 16. This allows for a transmission diversity effect.

[0536] Sending Methods #4-7:

[0537] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 4 and less than or equal to 64. This allows for the effect of transmission diversity.

[0538] Sending Methods #4-8:

[0539] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 16 and less than or equal to 256. This allows for a transmission diversity effect.

[0540] Sending Methods #4-9:

[0541] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 64 and not more than 4096. There may be cases where the effect of transmission diversity can be obtained.

[0542] As described above, the method of selecting a transmission method when transmitting a modulated signal of a single-carrier scheme is different from the method of selecting a transmission method when transmitting a modulated signal of a multi-carrier scheme such as the OFDM scheme.

[0543] The reason for using the fourth selection method as a method of selecting a transmission method when transmitting a modulated signal of a multi-carrier method such as the OFDM method will be described.

[0544] Transmitters that transmit multi-carrier modulated signals, such as OFDM, must meet the following requirements: minimize the impact of RF phase noise and minimize the impact of nonlinear distortion in the transmit power amplifier, regardless of the modulation method. (If these requirements are not met, high data reception quality will be difficult to achieve in a receiver that receives the modulated signals sent by the transmitter.) (Since transmitters simultaneously transmit modulated signals using multiple carriers, PAPR is high regardless of the modulation method, making these requirements important.)

[0545] Therefore, in Figure 1 In the case where the transmitting device is the "third transmitting device" (or the first transmitting device), by setting it to the fourth selection method, when multiple modulated signals are sent, in order to increase the possibility that the receiving device can obtain higher data reception quality, it is given priority to implement precoding as much as possible.

[0546] By doing as described above, it is possible to obtain an effect of higher data reception quality regardless of whether "the transmitting device transmits a modulated signal in a single-carrier manner or a modulated signal in a multi-carrier manner such as an OFDM manner," the receiving device that receives the modulated signal sent by the transmitting device can obtain.

[0547] Next, a fifth selection method different from the fourth selection method when transmitting a modulated signal of a multi-carrier transmission method such as the OFDM method will be described.

[0548] 5th selection method:

[0549] Sending method #5-1:

[0550] The modulation mode of transmitting a single stream (s1(i)) is set to BPSK (or π / 2 shift BPSK) (wherein the modulation signal of a single stream can be transmitted using one antenna or multiple antennas).

[0551] Sending method #5-2:

[0552] The modulation mode of transmitting a single stream (s1(i)) is set to QPSK (or π / 2 phase shift QPSK) (wherein the modulated signal of a single stream can be transmitted using one antenna or multiple antennas).

[0553] Sending method #5-3:

[0554] The modulation method for transmitting a single stream (s1(i)) is set to 16QAM (or π / 2 phase-shifted 16QAM) (or a modulation method such as 16APSK in which there are 16 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0555] Sending method #5-4:

[0556] The modulation method for transmitting a single stream (s1(i)) is set to 64QAM (or π / 2 phase-shifted 64QAM) (or a modulation method such as 64APSK in which there are 64 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0557] Sending method #5-5:

[0558] The modulation method of s1(i) is set to BPSK (or π / 2 phase shift BPSK) when transmitting two streams (s1(i) and s2(i)), and the modulation method of s2(i) is set to BPSK (or π / 2 phase shift BPSK). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0559] Sending Method #5-6:

[0560] The modulation method of s1(i) is set to QPSK (or π / 2 shift QPSK) for transmitting two streams (s1(i) and s2(i)), and the modulation method of s2(i) is set to QPSK (or π / 2 shift QPSK). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas. In addition, the two streams are based on Figure 2 、 Figure 3, precoding (weighted synthesis) is performed using one of the (precoding) matrices of equations (13) to (20), and then, phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that 0≠0 radians (in addition, θ is assumed to be greater than or equal to 0 radians and less than 2π radians (0 radians ≤ θ < 2π radians)).

[0561] Sending Methods #5-7:

[0562] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to QPSK (or π / 2 phase shift QPSK), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , use one of the (precoding) matrices of equations (13) to (20) for precoding (weighted synthesis), and then perform phase change (by the phase change unit 205B) and send. (In addition, there is also a case where the phase change is not performed, and coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than 0 radians and less than 2π radians (0 radians ≤ θ < 2π radians)). If it is set to (θ = π / 4 radians (45 degrees), the average transmission power of the modulated signal sent from each antenna is equal).

[0563] Sending Methods #5-8:

[0564] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3, precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0565] The precoding process here will be described.

[0566] exist Figure 1 In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0567] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0568] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0569] Sending Methods #5-9:

[0570] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3, precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0571] Or the modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). In this case, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices of equations (13) to (20), and then, phase change is performed (by the phase change unit 205B) and transmitted. (Also, it is also possible not to perform phase change, and there are also cases where coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ = 0 radians (although θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0572] Or the modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). In this case, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3, precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0573] The precoding process here will be described.

[0574] exist Figure 1 In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0575] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0576] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0577] Furthermore, the fifth selection method does not need to be compatible with all of the transmission methods from transmission method #5-1 to transmission method #5-9. For example, the fifth selection method only needs to be compatible with at least one of the three transmission methods #5-5, #5-6, and #5-7. Furthermore, the fifth selection method only needs to be compatible with at least one of the two transmission methods #5-8 and #5-9.

[0578] In addition, in the fifth selection method, it is not necessary to correspond to the transmission method #4-1. (In the fifth selection method, Figure 1 The selection candidates for the sending method of the sending device do not include sending method #5-1).

[0579] The fifth selection method may include transmission methods other than transmission methods #5-1 to #5-9.

[0580] At this time, the following is satisfied.

[0581] Sending method #5-1:

[0582] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is two.

[0583] Sending method #5-2:

[0584] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is four.

[0585] Sending method #5-3:

[0586] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 16.

[0587] Sending method #5-4:

[0588] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 64.

[0589] Sending method #5-5:

[0590] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 2 and less than or equal to 4. This allows for a transmission diversity effect.

[0591] Sending Method #5-6:

[0592] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 4 and less than or equal to 16. This allows for a transmission diversity effect.

[0593] Sending Methods #5-7:

[0594] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 4 and less than or equal to 64. This allows for the effect of transmission diversity.

[0595] Sending Methods #5-8:

[0596] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 16 and not more than 256. There are cases where the effect of transmission diversity can be obtained.

[0597] Sending Methods #5-9:

[0598] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 64 and not more than 4096. There may be cases where the effect of transmission diversity can be obtained.

[0599] As described above, the method of selecting a transmission method when transmitting a modulated signal of a single-carrier scheme is different from the method of selecting a transmission method when transmitting a modulated signal of a multi-carrier scheme such as the OFDM scheme.

[0600] The reason for selecting the fifth selection method as a method of selecting a transmission method when transmitting a modulated signal of a multi-carrier method such as the OFDM method will be described.

[0601] Transmitters that transmit multi-carrier modulated signals, such as OFDM, must meet the following requirements: minimize the impact of RF phase noise, regardless of the modulation method, and minimize the impact of nonlinear distortion in the transmit power amplifier. (If these requirements are not met, high data reception quality will be difficult to achieve in a receiver that receives the modulated signals sent by the transmitter.) (Because transmitters simultaneously transmit modulated signals using multiple carriers, PAPR is high regardless of the modulation method, making these requirements important.)

[0602] Therefore, in Figure 1 When the transmitting device is the "third transmitting device" (or the first transmitting device), by setting it to the fifth selection method, when multiple modulated signals are sent, in order to increase the possibility that the receiving device can obtain higher data reception quality, it is given priority to implement precoding as much as possible.

[0603] By doing as described above, it is possible to obtain an effect of higher data reception quality regardless of whether "the transmitting device transmits a modulated signal in a single-carrier manner or a modulated signal in a multi-carrier manner such as an OFDM manner," the receiving device that receives the modulated signal sent by the transmitting device can obtain.

[0604] Next, a sixth selection method, which is different from the fourth and fifth selection methods, will be described for transmitting a modulated signal in a multi-carrier transmission method such as the OFDM method.

[0605] 6th selection method:

[0606] Sending method #6-1:

[0607] The modulation mode of transmitting a single stream (s1(i)) is set to BPSK (or π / 2 shift BPSK) (wherein the modulation signal of a single stream can be transmitted using one antenna or multiple antennas).

[0608] Sending method #6-2:

[0609] The modulation mode of transmitting a single stream (s1(i)) is set to QPSK (or π / 2 phase shift QPSK) (wherein the modulated signal of a single stream can be transmitted using one antenna or multiple antennas).

[0610] Sending method #6-3:

[0611] The modulation method for transmitting a single stream (s1(i)) is set to 16QAM (or π / 2 phase-shifted 16QAM) (or a modulation method such as 16APSK in which there are 16 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0612] Sending Method #6-4:

[0613] The modulation method for transmitting a single stream (s1(i)) is set to 64QAM (or π / 2 phase-shifted 64QAM) (or a modulation method such as 64APSK in which there are 64 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0614] Sending method #6-5:

[0615] The modulation method of s1(i) is set to BPSK (or π / 2 phase shift BPSK) when transmitting two streams (s1(i) and s2(i)), and the modulation method of s2(i) is set to BPSK (or π / 2 phase shift BPSK). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0616] The precoding process here will be described.

[0617] exist Figure 1 In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0618] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0619] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0620] Sending method #6-6:

[0621] The modulation method of s1(i) is set to QPSK (or π / 2 shift QPSK) for transmitting two streams (s1(i) and s2(i)), and the modulation method of s2(i) is set to QPSK (or π / 2 shift QPSK). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0622] The precoding process here will be described.

[0623] exist Figure 1 In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0624] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0625] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0626] Sending Method #6-7:

[0627] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to QPSK (or π / 2 phase shift QPSK), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , use one of the (precoding) matrices of equations (13) to (20) for precoding (weighted synthesis), and then perform phase change (by the phase change unit 205B) and send. (In addition, there is also a case where the phase change is not performed, and coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than 0 radians and less than 2π radians (0 radians ≤ θ < 2π radians)). If it is set to (θ = π / 4 radians (45 degrees), the average transmission power of the modulated signal sent from each antenna is equal).

[0628] Sending Methods #6-8:

[0629] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0630] Sending Methods #6-9:

[0631] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0632] Or the modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). In this case, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices of equations (13) to (20), and then, phase change is performed (by the phase change unit 205B) and transmitted. (Also, it is also possible not to perform phase change, and there are also cases where coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ = 0 radians (although θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0633] Or the modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). In this case, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0634] The precoding process here will be described.

[0635] exist Figure 1 In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0636] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0637] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0638] Furthermore, the sixth selection method does not need to be compatible with all of the transmission methods from transmission method #6-1 to transmission method #6-9. For example, the sixth selection method only needs to be compatible with at least one of the three transmission methods #6-5, #6-6, and #6-7. Furthermore, the sixth selection method only needs to be compatible with at least one of the two transmission methods #6-8 and #6-9.

[0639] In addition, in the sixth selection method, it is not necessary to correspond to the transmission method #6-1. (In the sixth selection method, Figure 1 The selection candidates for the sending method of the sending device do not include sending method #6-1).

[0640] The sixth selection method may include transmission methods other than transmission methods #6-1 to #6-9.

[0641] At this time, the following is satisfied.

[0642] Sending method #6-1:

[0643] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is two.

[0644] Sending method #6-2:

[0645] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is four.

[0646] Sending method #6-3:

[0647] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 16.

[0648] Sending Method #6-4:

[0649] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 64.

[0650] Sending method #6-5:

[0651] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 2 and not more than 4. There are cases where the effect of transmission diversity can be obtained.

[0652] Sending method #6-6:

[0653] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 4 and not more than 16. There are cases where the effect of transmission diversity can be obtained.

[0654] Sending Method #6-7:

[0655] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 4 and less than or equal to 64. This allows for the effect of transmission diversity.

[0656] Sending Methods #6-8:

[0657] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 16 and less than or equal to 256. This allows for a transmission diversity effect.

[0658] Sending Methods #6-9:

[0659] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 64 and not more than 4096. There may be cases where the effect of transmission diversity can be obtained.

[0660] As described above, the method of selecting a transmission method when transmitting a modulated signal of a single-carrier scheme is different from the method of selecting a transmission method when transmitting a modulated signal of a multi-carrier scheme such as the OFDM scheme.

[0661] The reason for selecting the sixth selection method as a method of selecting a transmission method when transmitting a modulated signal of a multi-carrier method such as the OFDM method will be described.

[0662] Transmitters that transmit multi-carrier modulated signals, such as OFDM, must meet the following requirements: minimize the impact of RF phase noise, regardless of the modulation method, and minimize the impact of nonlinear distortion in the transmit power amplifier. (If these requirements are not met, high data reception quality will be difficult to achieve in a receiver that receives the modulated signals sent by the transmitter.) (Because transmitters simultaneously transmit modulated signals using multiple carriers, PAPR is high regardless of the modulation method, making these requirements important.)

[0663] Therefore, in Figure 1 When the transmitting device is the "third transmitting device" (or the first transmitting device), by setting it to the sixth selection method, when multiple modulated signals are sent, in order to increase the possibility that the receiving device can obtain higher data reception quality, it is given priority to implement precoding as much as possible.

[0664] By doing as described above, it is possible to obtain an effect of higher data reception quality regardless of whether "the transmitting device transmits a modulated signal in a single-carrier manner or a modulated signal in a multi-carrier manner such as an OFDM manner," the receiving device that receives the modulated signal sent by the transmitting device can obtain.

[0665] Next, a seventh selection method, which is different from the fourth, fifth, and sixth selection methods, will be described for transmitting a modulated signal in a multi-carrier transmission method such as the OFDM method.

[0666] 7th selection method:

[0667] Sending method #7-1:

[0668] The modulation mode of transmitting a single stream (s1(i)) is set to BPSK (or π / 2 shift BPSK) (wherein the modulation signal of a single stream can be transmitted using one antenna or multiple antennas).

[0669] Sending Method #7-2:

[0670] The modulation mode of transmitting a single stream (s1(i)) is set to QPSK (or π / 2 phase shift QPSK) (wherein the modulated signal of a single stream can be transmitted using one antenna or multiple antennas).

[0671] Sending method #7-3:

[0672] The modulation method for transmitting a single stream (s1(i)) is set to 16QAM (or π / 2 phase-shifted 16QAM) (or a modulation method such as 16APSK in which there are 16 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0673] Sending Method #7-4:

[0674] The modulation method for transmitting a single stream (s1(i)) is set to 64QAM (or π / 2 phase-shifted 64QAM) (or a modulation method such as 64APSK in which there are 64 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0675] Sending method #7-5:

[0676] The modulation method of s1(i) is set to BPSK (or π / 2 phase shift BPSK) when transmitting two streams (s1(i) and s2(i)), and the modulation method of s2(i) is set to BPSK (or π / 2 phase shift BPSK). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas. In addition, the two streams are based on Figure 2 、 Figure 3, precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0677] The precoding process here will be described.

[0678] exist Figure 1 In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0679] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0680] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0681] Sending Method #7-6:

[0682] The modulation method of s1(i) is set to QPSK (or π / 2 shift QPSK) for transmitting two streams (s1(i) and s2(i)), and the modulation method of s2(i) is set to QPSK (or π / 2 shift QPSK). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0683] The precoding process here will be described.

[0684] exist Figure 1In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0685] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0686] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0687] Sending method #7-7:

[0688] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to QPSK (or π / 2 phase shift QPSK), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , use one of the (precoding) matrices of equations (13) to (20) for precoding (weighted synthesis), and then perform phase change (by the phase change unit 205B) and send. (In addition, there is also a case where the phase change is not performed, and coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than 0 radians and less than 2π radians (0 radians ≤ θ < 2π radians)). If it is set to (θ = π / 4 radians (45 degrees), the average transmission power of the modulated signal sent from each antenna is equal).

[0689] Sending Method #7-8:

[0690] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0691] The precoding process here will be described.

[0692] exist Figure 1 In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0693] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0694] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0695] Sending Methods #7-9:

[0696] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0697] Or the modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). In this case, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices of equations (13) to (20), and then, phase change is performed (by the phase change unit 205B) and transmitted. (Also, it is also possible not to perform phase change, and there are also cases where coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ = 0 radians (although θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0698] Or the modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). In this case, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0699] The precoding process here will be described.

[0700] exist Figure 1 In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0701] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0702] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0703] Furthermore, the seventh selection method does not need to support all of the transmission methods from transmission method #7-1 to transmission method #7-9. For example, the seventh selection method only needs to support at least one of the three transmission methods #7-5, #7-6, and #7-7. Furthermore, the seventh selection method only needs to support at least one of the two transmission methods #7-8 and #7-9.

[0704] In addition, in the seventh selection method, it is not necessary to correspond to the transmission method #7-1. (In the seventh selection method, Figure 1 The selection candidates for the sending method of the sending device do not include sending method #7-1).

[0705] The seventh selection method may include transmission methods other than transmission methods #7-1 to #7-9.

[0706] At this time, the following is satisfied.

[0707] Sending method #7-1:

[0708] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is two.

[0709] Sending Method #7-2:

[0710] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is four.

[0711] Sending method #7-3:

[0712] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 16.

[0713] Sending Method #7-4:

[0714] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 64.

[0715] Sending method #7-5:

[0716] The number of signal points in the in-phase I-quadrature Q plane of the transmitted signal is greater than or equal to 2 and less than or equal to 4. There are cases where the effect of transmit diversity can be obtained. π transmission method #7-6:

[0717] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 4 and not more than 16. There are cases where the effect of transmission diversity can be obtained.

[0718] Sending method #7-7:

[0719] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 4 and less than or equal to 64. This allows for the effect of transmission diversity.

[0720] Sending Method #7-8:

[0721] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 16 and not more than 256. There are cases where the effect of transmission diversity can be obtained.

[0722] Sending Methods #7-9:

[0723] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 64 and not more than 4096. There may be cases where the effect of transmission diversity can be obtained.

[0724] As described above, the method of selecting a transmission method when transmitting a modulated signal of a single-carrier scheme is different from the method of selecting a transmission method when transmitting a modulated signal of a multi-carrier scheme such as the OFDM scheme.

[0725] The reason for selecting the seventh selection method as a method of selecting a transmission method when transmitting a modulated signal of a multi-carrier method such as the OFDM method will be described.

[0726] Transmitters that transmit multi-carrier modulated signals, such as OFDM, must meet the following requirements: minimize the impact of RF phase noise, regardless of the modulation method, and minimize the impact of nonlinear distortion in the transmit power amplifier. (If these requirements are not met, high data reception quality will be difficult to achieve in a receiver that receives the modulated signals sent by the transmitter.) (Because transmitters simultaneously transmit modulated signals using multiple carriers, PAPR is high regardless of the modulation method, making these requirements important.)

[0727] Therefore, in Figure 1 In the case where the transmitting device is the "third transmitting device" (or the first transmitting device), by setting it to the seventh selection method, when multiple modulated signals are sent, in order to increase the possibility that the receiving device can obtain higher data reception quality, it is given priority to implement precoding as much as possible.

[0728] By doing as described above, it is possible to obtain an effect of higher data reception quality regardless of whether "the transmitting device transmits a modulated signal in a single-carrier manner or a modulated signal in a multi-carrier manner such as an OFDM manner," the receiving device that receives the modulated signal sent by the transmitting device can obtain.

[0729] Next, an eighth selection method different from the fourth, fifth, sixth, and seventh selection methods will be described for transmitting a modulated signal in a multi-carrier transmission method such as the OFDM method.

[0730] 8th selection method:

[0731] Sending method #8-1:

[0732] The modulation mode of transmitting a single stream (s1(i)) is set to BPSK (or π / 2 shift BPSK) (wherein the modulation signal of a single stream can be transmitted using one antenna or multiple antennas).

[0733] Sending Method #8-2:

[0734] The modulation mode of transmitting a single stream (s1(i)) is set to QPSK (or π / 2 phase shift QPSK) (wherein the modulated signal of a single stream can be transmitted using one antenna or multiple antennas).

[0735] Sending Method #8-3:

[0736] The modulation method for transmitting a single stream (s1(i)) is set to 16QAM (or π / 2 phase-shifted 16QAM) (or a modulation method such as 16APSK in which there are 16 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0737] Sending Method #8-4:

[0738] The modulation method for transmitting a single stream (s1(i)) is set to 64QAM (or π / 2 phase-shifted 64QAM) (or a modulation method such as 64APSK in which there are 64 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0739] Sending Method #8-5:

[0740] One of the sending methods #4-5 or #6-5.

[0741] Sending Method #8-6:

[0742] One of the sending methods #4-6 or sending method #6-6.

[0743] Sending Method #8-7:

[0744] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to QPSK (or π / 2 phase shift QPSK), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0745] Sending method #8-8:

[0746] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0747] Sending Method #8-9:

[0748] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0749] Or the modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). In this case, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , use one of the (precoding) matrices of equations (13) to (20) for precoding (weighted synthesis), then perform phase change (by phase changer 205B) and transmit. (Also, it is also possible not to perform phase change, and there are also cases where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ = 0 radians (although θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ 0 < 2π radians)).

[0750] Or the modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). In this case, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0751] The precoding process here will be described.

[0752] exist Figure 1 In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0753] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0754] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0755] Furthermore, the eighth selection method does not necessarily need to support all of the transmission methods #8-1 through #8-9. For example, the eighth selection method only needs to support at least one of the three transmission methods #8-5, #8-6, and #8-7. Furthermore, the eighth selection method only needs to support at least one of the two transmission methods #8-8 and #8-9.

[0756] In addition, in the eighth selection method, it is not necessary to correspond to the transmission method #8-1. (In the eighth selection method, Figure 1 The selection candidates for the sending method of the sending device do not include sending method #8-1).

[0757] The eighth selection method may include transmission methods other than transmission methods #8-1 to #8-9.

[0758] At this time, the following is satisfied.

[0759] Sending method #8-1:

[0760] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is two.

[0761] Sending Method #8-2:

[0762] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is four.

[0763] Sending Method #8-3:

[0764] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 16.

[0765] Sending Method #8-4:

[0766] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 64.

[0767] Sending Method #8-5:

[0768] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 2 and not more than 4. There are cases where the effect of transmission diversity can be obtained.

[0769] Sending Method #8-6:

[0770] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 4 and not more than 16. There are cases where the effect of transmission diversity can be obtained.

[0771] Sending Method #8-7:

[0772] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 4 and less than or equal to 64. This allows for the effect of transmission diversity.

[0773] Sending method #8-8:

[0774] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 16 and less than or equal to 256. This allows for a transmission diversity effect.

[0775] Sending Method #8-9:

[0776] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 64 and not more than 4096. There may be cases where the effect of transmission diversity can be obtained.

[0777] As described above, the method of selecting a transmission method when transmitting a modulated signal of a single-carrier scheme is different from the method of selecting a transmission method when transmitting a modulated signal of a multi-carrier scheme such as the OFDM scheme.

[0778] The reason for selecting the eighth selection method as a method of selecting a transmission method when transmitting a modulated signal of a multi-carrier method such as the OFDM method will be described.

[0779] Transmitters that transmit multi-carrier modulated signals, such as OFDM, must meet the following requirements: minimize the impact of RF phase noise, regardless of the modulation method, and minimize the impact of nonlinear distortion in the transmit power amplifier. (If these requirements are not met, high data reception quality will be difficult to achieve in a receiver that receives the modulated signals sent by the transmitter.) (Because transmitters simultaneously transmit modulated signals using multiple carriers, PAPR is high regardless of the modulation method, making these requirements important.)

[0780] Therefore, in Figure 1 In the case where the transmitting device is the "third transmitting device" (or the first transmitting device), by setting it to the 8th selection method, when multiple modulated signals are sent, in order to increase the possibility that the receiving device can obtain higher data reception quality, it is given priority to implement precoding as much as possible.

[0781] By doing as described above, it is possible to obtain an effect of higher data reception quality regardless of whether "the transmitting device transmits a modulated signal in a single-carrier manner or a modulated signal in a multi-carrier manner such as an OFDM manner," the receiving device that receives the modulated signal sent by the transmitting device can obtain.

[0782] Next, a ninth selection method will be described that is different from the fourth, fifth, sixth, seventh, and eighth selection methods when transmitting a modulated signal in a multi-carrier transmission method such as the OFDM method.

[0783] 9th selection method:

[0784] Sending Method #9-1:

[0785] The modulation mode of transmitting a single stream (s1(i)) is set to BPSK (or π / 2 shift BPSK) (wherein the modulation signal of a single stream can be transmitted using one antenna or multiple antennas).

[0786] Sending Method #9-2:

[0787] The modulation mode of transmitting a single stream (s1(i)) is set to QPSK (or π / 2 phase shift QPSK) (wherein the modulated signal of a single stream can be transmitted using one antenna or multiple antennas).

[0788] Sending Method #9-3:

[0789] The modulation method for transmitting a single stream (s1(i)) is set to 16QAM (or π / 2 phase-shifted 16QAM) (or a modulation method such as 16APSK in which there are 16 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0790] Sending Method #9-4:

[0791] The modulation method for transmitting a single stream (s1(i)) is set to 64QAM (or π / 2 phase-shifted 64QAM) (or a modulation method such as 64APSK in which there are 64 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0792] Sending Method #9-5:

[0793] One of the sending methods #4-5 or #6-5.

[0794] Sending Method #9-6:

[0795] One of the sending methods #4-6 or sending method #6-6.

[0796] Sending Method #9-7:

[0797] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to QPSK (or π / 2 phase shift QPSK), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0798] Sending Method #9-8:

[0799] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0800] The precoding process here will be described.

[0801] exist Figure 1In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0802] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0803] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0804] Sending method #9-9:

[0805] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0806] Or the modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). In this case, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices of equations (13) to (20), and then, phase change is performed (by the phase change unit 205B) and transmitted. (Also, it is also possible not to perform phase change, and there are also cases where coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ = 0 radians (although θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0807] Or the modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). In this case, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0808] The precoding process here will be described.

[0809] exist Figure 1In a transmitting device, for precoding processing, multiple precoding matrices represented by any of equations (13) to (20) are prepared. For example, N (N is an integer greater than or equal to 2) precoding matrices are prepared as precoding matrices. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by any of equations (13) to (20)).

[0810] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0811] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0812] Furthermore, the ninth selection method does not need to be compatible with all of the transmission methods from transmission method #9-1 to transmission method #9-9. For example, the ninth selection method only needs to be compatible with at least one of the three transmission methods #9-5, #9-6, and #9-7. Furthermore, the ninth selection method only needs to be compatible with at least one of the two transmission methods #9-8 and #9-9.

[0813] In addition, in the 9th selection method, it is not necessary to correspond to the transmission method #9-1. (In the 9th selection method, Figure 1 The selection candidates for the sending method of the sending device do not include sending method #9-1).

[0814] The ninth selection method may include transmission methods other than transmission methods #9-1 to #9-9.

[0815] At this time, the following is satisfied.

[0816] Sending Method #9-1:

[0817] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is two.

[0818] Sending Method #9-2:

[0819] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is four.

[0820] Sending Method #9-3:

[0821] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 16.

[0822] Sending Method #9-4:

[0823] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is 64.

[0824] Sending Method #9-5:

[0825] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 2 and not more than 4. There are cases where the effect of transmission diversity can be obtained.

[0826] Sending Method #9-6:

[0827] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 4 and not more than 16. There are cases where the effect of transmission diversity can be obtained.

[0828] Sending Method #9-7:

[0829] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is greater than 4 and less than or equal to 64. This allows for the effect of transmission diversity.

[0830] Sending Method #9-8:

[0831] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 16 and not more than 256. There are cases where the effect of transmission diversity can be obtained.

[0832] Sending method #9-9:

[0833] The number of signal points in the in-phase I-quadrature Q plane of the transmission signal is not less than 64 and not more than 4096. There may be cases where the effect of transmission diversity can be obtained.

[0834] As described above, the method of selecting a transmission method when transmitting a modulated signal of a single-carrier scheme is different from the method of selecting a transmission method when transmitting a modulated signal of a multi-carrier scheme such as the OFDM scheme.

[0835] The reason for selecting the ninth selection method as a method of selecting a transmission method when transmitting a modulated signal of a multi-carrier method such as the OFDM method will be described.

[0836] Transmitters that transmit multi-carrier modulated signals, such as OFDM, must meet the following requirements: minimize the impact of RF phase noise, regardless of the modulation method, and minimize the impact of nonlinear distortion in the transmit power amplifier. (If these requirements are not met, high data reception quality will be difficult to achieve in a receiver that receives the modulated signals sent by the transmitter.) (Because transmitters simultaneously transmit modulated signals using multiple carriers, PAPR is high regardless of the modulation method, making these requirements important.)

[0837] Therefore, in Figure 1 In the case where the transmitting device is the "third transmitting device" (or the first transmitting device), by setting it to the 9th selection method, when multiple modulated signals are sent, in order to increase the possibility that the receiving device can obtain higher data reception quality, it is given priority to implement precoding as much as possible.

[0838] By doing as described above, it is possible to obtain an effect of higher data reception quality regardless of whether "the transmitting device transmits a modulated signal in a single-carrier manner or a modulated signal in a multi-carrier manner such as an OFDM manner," the receiving device that receives the modulated signal sent by the transmitting device can obtain.

[0839] Next, application examples of the single-carrier transmission method described so far and a multi-carrier transmission method such as the OFDM method will be described.

[0840] For example, assume that standard α exists as a wireless communication method. Furthermore, assume that standard α specifies the frequency band to be used and sets one or more frequency bands. In this case, standard α is assumed to be a standard capable of transmitting modulated signals using both single-carrier transmission and multi-carrier transmission using OFDM or other methods.

[0841] Furthermore, as a single-carrier transmission, one of the “first selection method,” “second selection method,” or “third selection method” described in Implementation 1 is supported. Furthermore, as a multi-carrier transmission such as an OFDM method, one of the “fourth selection method,” “fifth selection method,” “sixth selection method,” “seventh selection method,” “eighth selection method,” or “ninth selection method” described in this implementation is supported.

[0842] Therefore, based on the description of "first transmitting device", "second transmitting device" and "third transmitting device", the following three types of transmitting devices can be considered.

[0843] 4th sending device:

[0844] The fourth transmitting device is a transmitting device capable of selectively transmitting both a modulation signal of a single carrier method of the standard α and a modulation signal of a multi-carrier transmission method such as the OFDM method of the standard α. Figure 1 The control signal 100 of the transmitting device includes control information for designating "single carrier transmission / multi-carrier transmission such as OFDM transmission". When the control signal 100 indicates "single carrier transmission", Figure 1 The transmitting device transmits a modulated signal of a single carrier method of the standard α, and when the control signal 100 indicates "transmission of a multi-carrier method such as OFDM method", Figure 1 The transmitting device transmits a modulated signal of a multi-carrier method such as the OFDM method of the standard α. Figure 1 The sending device is Figure 19 The receiving device sends control information for designating "single-carrier transmission / multi-carrier transmission such as OFDM", Figure 19 The receiving device can Figure 1 The modulated signal sent by the transmitting device is received and demodulated and decoded.

[0845] No. 5 sending device:

[0846] Assume that the fifth transmitting device is a transmitting device capable of transmitting a modulated signal of a standard α single carrier method. Figure 1 When the control signal 100 of the transmitting device includes control information for designating "single carrier transmission / multi-carrier transmission such as OFDM", only "single carrier transmission" can be selected as the control information. Figure 1 The transmitting device transmits the modulated signal of the standard α single carrier mode. Figure 1 The sending device is Figure 19 The receiving device sends control information for designating "single-carrier transmission / multi-carrier transmission such as OFDM", Figure 19 The receiving device can Figure 1 The modulated signal sent by the transmitting device is received and demodulated and decoded.

[0847] No. 6 sending device:

[0848] Assume that the sixth transmitting device is a transmitting device capable of transmitting a modulated signal of a multi-carrier method such as the standard α OFDM method. Figure 1 When the control signal 100 of the transmitting device includes control information for designating "single carrier transmission / multi-carrier transmission such as OFDM", only "multi-carrier transmission such as OFDM" can be selected as the control information. Figure 1The transmitting device transmits a modulated signal of a multi-carrier method such as the OFDM method of the standard α. Figure 1 The sending device is Figure 19 The receiving device sends control information for designating "single-carrier transmission / multi-carrier transmission such as OFDM", Figure 19 The receiving device can Figure 1 The modulated signal sent by the transmitting device is received and demodulated and decoded.

[0849] When the fourth transmitting device supports Standard α, for example, when the transmitting device uses a common RF unit and a common transmit power amplifier to support both transmission of signals modulated using Standard α's single-carrier method and transmission of signals modulated using a multi-carrier transmission method such as Standard α's OFDM method, the RF unit and transmit power amplifier are designed to minimize the effects of phase noise and nonlinear distortion on signals modulated using a multi-carrier transmission method such as Standard α's OFDM method. Consequently, the effects of phase noise and nonlinear distortion on signals modulated using Standard α's single-carrier method are also minimized. Consequently, the receiving device can achieve high data reception quality regardless of whether the transmitting device transmits signals modulated using Standard α's single-carrier method or using a multi-carrier transmission method such as Standard α's OFDM method.

[0850] As another method, in the fourth transmitting device, when a modulated signal of a single-carrier method is transmitted in accordance with standard α, an RF unit and a transmitting power amplifier for transmitting a modulated signal of a single-carrier method are used; and when a modulated signal of a multi-carrier transmission method such as the OFDM method of standard α is transmitted, an RF unit and a transmitting power amplifier for transmitting a modulated signal of a multi-carrier method such as the OFDM method are used.

[0851] This allows the receiving device to achieve high data reception quality regardless of whether the transmitting device transmits a signal modulated using a standard α single-carrier method or a multi-carrier transmission method such as the standard α OFDM method. Furthermore, since the transmitting device can use an appropriate RF unit and transmit power amplifier when transmitting a standard α single-carrier modulation signal, power consumption can be reduced.

[0852] The fifth transmitting device transmits a modulated signal using a standard α single-carrier scheme. In this case, as described in Embodiments 1 and 2, the selection method limits the available transmission methods, thereby reducing the PAPR. This reduces the effects of phase noise and nonlinear distortion, improving data reception quality in a receiving device that receives the modulated signal transmitted by the transmitting device. Furthermore, the transmitting device can utilize a smaller circuit size and a lower power consumption RF unit and transmit power amplifier.

[0853] The sixth transmitting device transmits a modulated signal using a multi-carrier scheme such as the standard α OFDM scheme. In this case, as described in Embodiment 2, the selector method limits the available transmission methods. This improves the data reception quality at the receiving device that receives the modulated signal transmitted by the transmitting device.

[0854] As described above, in Standard α, which supports both single-carrier transmission and multi-carrier transmission methods such as OFDM, the differences between the transmission method supporting single-carrier transmission and the transmission method supporting multi-carrier transmission methods such as OFDM are significant. This enables the effects described above to be achieved.

[0855] Furthermore, the spread spectrum communication method can be applied to a single-carrier modulation signal, and can also be applied to a multi-carrier modulation signal such as an OFDM method.

[0856] (Supplement 1)

[0857] Of course, the embodiment modes and other contents described in this specification may be combined in a plurality and implemented.

[0858] In addition, each embodiment is merely an example. For example, although "modulation method, error correction coding method (error correction code used, code length, coding rate, etc.), control information, etc." are illustrated, the same structure can be used when other "modulation method, error correction coding method (error correction code used, code length, coding rate, etc.), control information, etc." are applied.

[0859] Regarding the modulation method, the embodiments and other contents described in this specification can be implemented even if a modulation method other than the modulation method described in this specification is used. For example, APSK (Amplitude Phase Shift Keying) (for example, 16APSK, 64APSK, 128APSK, 256APSK, 1024APSK, 4096APSK, etc.), PAM (Pulse Amplitude Modulation) (for example, 4PAM, 8PAM, 16PAM, 64PAM, 128PAM, 256PAM, 1024PAM, 4096PAM, etc.), PSK (Phase Shift Keying) (for example, BPSK, QPSK, 8PSK, 16PSK, 64PSK, 128PSK, 256PSK, 1024PSK, 4096PSK, etc.), QAM (Quadrature Amplitude Modulation) (for example, 4PAM, 8PAM, 16PAM, 64PAM, 128PAM, 256PAM, 1024PAM, 4096PAM, etc.), Modulation: Quadrature Amplitude Modulation (for example, 4QAM, 8QAM, 16QAM, 64QAM, 128QAM, 256QAM, 1024QAM, 4096QAM, etc.), etc., can also be set to uniform mapping or non-uniform mapping in each modulation method. In addition, the configuration method of 2, 4, 8, 16, 64, 128, 256, 1024, etc. signal points in the IQ plane (modulation methods with 2, 4, 8, 16, 64, 128, 256, 1024, etc. signal points) is not limited to the signal point configuration methods of the modulation methods described in this specification.

[0860] In this specification, a transmitter can be considered to be, for example, a communication / broadcasting device such as a broadcast station, base station, access point, terminal, or mobile phone. A receiver can be considered to be a communication device such as a television, radio, terminal, personal computer, mobile phone, access point, or base station. Furthermore, the transmitter and receiver in the present invention are devices with communication functions, and it is also possible to consider such devices to be connected to a device for executing an application, such as a television, radio, personal computer, or mobile phone, via some interface. Furthermore, in this embodiment, symbols other than data symbols, such as pilot symbols (preamble, unique word, postamble, reference symbol, etc.) and control information symbols, can be arranged in any manner within a frame. While they are referred to here as pilot symbols and control information symbols, any naming is acceptable; the function itself is what is important.

[0861] The pilot code element can be, for example, a known code element modulated using PSK modulation in a transceiver (or, it can be synchronized through the receiver so that the receiver knows the code element sent by the transmitter). The receiver uses this code element to perform frequency synchronization, time synchronization, channel estimation (CSI (Channel State Information) estimation) (of each modulated signal), signal detection, etc.

[0862] In addition, the code elements used for control information are code elements used to implement communications other than data (applications, etc.) and to transmit information that needs to be transmitted to the communication partner (for example, the modulation method used in the communication, the error correction coding method, the coding rate of the error correction coding method, setting information in the upper layer, etc.).

[0863] The present invention is not limited to the embodiments and can be implemented with various modifications. For example, in each embodiment, the case where the communication device is used is described, but the present invention is not limited to this and the communication method can also be implemented as software.

[0864] Alternatively, for example, a program for executing the above-mentioned communication method may be stored in advance in a ROM (Read Only Memory), and the program may be run by a CPU (Central Processor Unit).

[0865] Alternatively, a program for executing the communication method may be stored in a computer-readable storage medium, and the program stored in the storage medium may be recorded in a RAM (Random Access Memory) of the computer to cause the computer to operate according to the program.

[0866] Furthermore, each structure of each embodiment described above can typically also be implemented as an integrated circuit, namely LSI (LargeScale Integration). They can be individually integrated into one chip, or they can be integrated into one chip in a manner that includes all or part of the structure of each embodiment. Here, it is set as LSI, but depending on the difference in integration, it is also called IC (Integrated Circuit), system LSI, super LSI, and ultra-large-scale LSI. In addition, the method of integrated circuitization is not limited to LSI, and it can also be implemented by a dedicated circuit or a general-purpose processor. It is also possible to use an FPGA (Field Programmable Gate Array) that can be programmed after the LSI is manufactured or a reconfigurable processor that can reconfigure the connection and setting of the circuit units inside the LSI. Furthermore, if an integrated circuit technology that replaces LSI emerges due to the advancement of semiconductor technology or other derived technologies, then of course the technology can also be used to integrate functional blocks. It may be an application in biotechnology, etc.

[0867] In addition, in the embodiment of this specification, as the structure of the sending device, a method based on Figure 1 The structure of the description, but not limited to this, for example, if it is Figure 22 Such a structure can also be implemented in each embodiment.

[0868] exist Figure 22 In, about Figure 1 Parts that operate in the same manner are given the same reference numerals. Figure 1 The description of the parts that operate in the same manner will be omitted.

[0869] exist Figure 22 In, with Figure 1 The difference in operation is that the error correction coding unit 102 outputs coded data 103_1 and 103_2. For example, the error correction coding unit 102 performs block coding such as LDPC (low density parity check) code. In this case, the coded data for the 2n-1th block is output as coded data 103_1, and the coded data for the 2nth block is output as coded data 103_2 (assuming n is an integer greater than 1).

[0870] Furthermore, the mapping unit 104 performs mapping of a specified modulation scheme based on the coded data 103_1 and outputs the mapped signal 105_1 , and performs mapping of a specified modulation scheme based on the coded data 103_2 and outputs the mapped signal 105_2 .

[0871] In addition, as Figure 1 、 Figure 22The signal processing unit 106 is configured to use Figure 2 The embodiment in this specification is described, but it can also be replaced Figure 2 And set Figure 23 structure to implement each implementation method.

[0872] exist Figure 23 In, about Figure 2 Parts that operate in the same manner are given the same reference numerals. Figure 1 The description of the parts that operate in the same manner will be omitted.

[0873] exist Figure 23 In, with Figure 2 The difference is that in Figure 23 No Figure 2 Therefore, the baseband signal 208A is equivalent to the phase change unit 209B. Figure 1 、 Figure 22 The processed signal 106_A and the baseband signal 208B are equivalent to Figure 1 、 Figure 22 The processed signal is 106_B.

[0874] In this specification, even if the specific configuration of the transmitting device differs, by generating a signal identical to any of the processed signals 106_A and 106_B described in each embodiment disclosed in this specification and transmitting it using multiple antenna units, the receiving device can achieve improved data reception quality for data symbols performing MIMO transmission (transmitting multiple streams) in an environment dominated by direct waves, particularly in a Loss of Sight (LOS) environment. (Other effects described in this specification can also be achieved similarly.)

[0875] In addition, Figure 1 、 Figure 22 In signal processing unit 106, phase changers may be provided both before and after weighted combination unit 203. Specifically, signal processing unit 106 includes, before weighted combination unit 203, either or both of phase changer 205A_1, which performs a phase change on mapped signal 201A to generate phase-changed signal 2801A, and phase changer 205B_1, which performs a phase change on mapped signal 201B to generate phase-changed signal 2801B. Furthermore, signal processing unit 106 includes, before insertion units 207A and 207B, either or both of phase changer 205A_2, which performs a phase change on weighted combination signal 204A to generate phase-changed signal 206A, and phase changer 205B_2, which performs a phase change on weighted combination signal 204B to generate phase-changed signal 206B.

[0876] Here, when signal processing unit 106 includes phase changer 205A_1, one input to weighted combination unit 203 is phase-changed signal 2801A. If signal processing unit 106 does not include phase changer 205A_1, one input to weighted combination unit 203 is mapped signal 201A. If signal processing unit 106 includes phase changer 205B_1, the other input to weighted combination unit 203 is phase-changed signal 2801B. If signal processing unit 106 does not include phase changer 205B_1, the other input to weighted combination unit 203 is mapped signal 201B. If signal processing unit 106 includes phase changer 205A_2, the input to insertion unit 207A is phase-changed signal 206A. If signal processing unit 106 does not include phase changer 205A_2, the input to insertion unit 207A is weighted-combined signal 204A. Furthermore, when the signal processing unit 106 includes the phase change unit 205B_2, the input of the insertion unit 207B is the phase-changed signal 206B. When the signal processing unit 106 does not include the phase change unit 205B_2, the input of the insertion unit 207B is the weighted-synthesized signal 204B.

[0877] also, Figure 1 、 Figure 22 The transmitting device may also include a second signal processing unit that performs other signal processing on the signal-processed signals 106_A and 106_B output by the signal processing unit 106. In this case, assuming that the two signals output by the second signal processing unit are the second signal-processed signal A and the second signal-processed signal B, the wireless unit 107_A receives the second signal-processed signal A as input and performs predetermined processing, while the wireless unit 107_B receives the second signal-processed signal B as input and performs predetermined processing.

[0878] In the case where the signal processing unit 106 is configured to include, at the preceding stage of the insertion units 207A and 207B, a phase changer 205A_2 for performing a phase change on the weighted-synthesized signal 204A to generate the phase-changed signal 206A, and a phase changer 205B_2 for performing a phase change on the weighted-synthesized signal 204B to generate the phase-changed signal 206B, the phase-changed signals 206A(z1(i)) and 206B(z2(i)) input to the insertion units 207A and 207B are obtained by, for example, applying the formulas (3) and (37) to (45) to the formulas (45).

[0879] [Formula 47]

[0880]

[0881] Towards

[0882] [Formula 48]

[0883]

[0884] A certain expression after the substitution of the first substitution. The expression after the substitution of the first substitution of the above-mentioned equations (3) and equations (37) to equations (45) can be applied as an expression representing its modified example to all structures described using any of equations (3) and equations (37) to equations (45) in the specification of this application.

[0885] The phase change value A(y A (i)) Phase change value B(y B (i)) can be used with y A (i) = ej × δ A (i) y B (i) = ej × δ B (i) represents. Here, δ A (i) and δ B (i) is a real number. A (i) and δ B (i) For example, it is assumed that for δ A (i)-δ B (i) The remainder calculation result of the divisor 2π changes with a period of N (N is an integer greater than 2). A (i) and δ B The setting of (i) is not limited to this. For example, the phase change value A(y A (i)) Phase change value B(y B (i) The difference (y) between the phase change value A and the phase change value B changes periodically or regularly. A (i) / y B (i) A method of periodically or regularly changing.

[0886] In the case where the signal processing unit 106 has a configuration in which both the phase changer 205A_2 for performing a phase change on the weighted synthesized signal 204A to generate the phase-changed signal 206A and the phase changer 205B_2 for not performing a phase change on the weighted synthesized signal 204B to generate the phase-changed signal 206B are provided at the preceding stage of the insertion units 207A and 207B, the phase-changed signal 206A (z1(i)) and the weighted synthesized signal 204B (z2(i)) input to the insertion units 207A and 207B can be obtained by, for example, applying equations (3) and (37) to equation (45).

[0887] [Formula 49]

[0888]

[0889] Towards

[0890] [Formula 50]

[0891]

[0892] The formula after the second substitution of the substitution is performed on Formula (3) and Formula (37) to Formula (45) can be applied as a formula representing its modified example to all structures described using any of Formula (3) and Formula (37) to Formula (45) in the specification of this application.

[0893] The phase change value y(i) is represented by, for example, equation (2). However, the method for setting the phase change value y(i) is not limited to equation (2), and methods such as periodically or regularly changing the phase may be considered.

[0894] In addition, in Embodiment 1, when the modulation method of the mapped signal 201A (s1(i)) is QPSK and the modulation method of the mapped signal 201B (s2(i)) is 16QAM, the values ​​of u and v in equation (37) are set to

[0895] [Formula 51]

[0896]

[0897] [Formula 52]

[0898]

[0899] or

[0900] [Formula 53]

[0901]

[0902] [Formula 54]

[0903]

[0904] The receiving device can obtain good data reception quality. However, when the modulation method of mapped signal 201A (s1(i)) is QPSK and the modulation method of mapped signal 201B (s2(i)) is 16QAM, the example of setting the values ​​of u and v that allows the receiving device to obtain good data reception quality is not limited to the combination of equations (51) and (52) and the combination of equations (53) and (54).

[0905] As an example, the error correction coding scheme used by error correction coding unit 102 to generate coded data 103 can be selected from a first error correction coding scheme and a second error correction coding scheme whose coding rate or code length differs from the first error correction coding scheme, or both. Mapping unit 104 uses the first modulation scheme to generate mapped signal 201A (s1(i)) and uses the second modulation scheme, which differs from the first modulation scheme, to generate mapped signal 201B (s2(i)). Here, when the first error correction coding scheme is used as the error correction coding scheme and the first and second modulation schemes are used as a combination of modulation schemes, signal processing unit 106 uses u1 and v1 as the values ​​of u and v, respectively, in equation (37). Furthermore, when the second error correction coding scheme is used as the error correction coding scheme and the first and second modulation schemes are used as a combination of modulation schemes, signal processing unit 106 uses u2 and v2 as the values ​​of u and v, respectively, in equation (37). At this time, when the ratio of u1 to v1 is different from the ratio of u2 to v2, the receiving device may be able to obtain better data reception quality than when the ratio of u1 to v1 and the ratio of u2 to v2 are the same.

[0906] In the above description, the ratio of the value of u to the value of v in equation (37) is varied when the coding rate or code length of the error correction coding scheme used by the error correction coding unit 102 to generate the coded data 103 is different, or when both are different. However, the ratio of the value of u to the value of v may be varied based on conditions other than the coding rate or code length of the error correction coding scheme. For example, the signal processing unit 106 may vary the ratio of the value of u to the value of v depending on the combination of the modulation schemes used as the first modulation scheme and the second modulation scheme. As another example, even when the error correction coding schemes are the same and the combination of the modulation schemes used as the first modulation scheme and the second modulation scheme are the same, the signal processing unit 106 may vary the ratio of the value of u to the value of v when transmitting a single-carrier modulation signal and when transmitting a multi-carrier modulation signal such as the OFDM scheme. With this configuration, the receiving device may be able to obtain good data reception quality.

[0907] (Supplement 2)

[0908] While the fifth, sixth, seventh, eighth, and ninth selection methods described in Embodiment 2 are described as being applied to a multi-carrier transmission method such as the OFDM method, the fifth, sixth, seventh, eighth, and ninth selection methods can also be applied to a single-carrier method. That is, when a transmitting apparatus generates a modulated signal for transmission, the fifth, sixth, seventh, eighth, and ninth selection methods can also be used.

[0909] The advantages of this case will be explained.

[0910] For example, in transmission methods #7-5, #7-6, #7-8, and #7-9 of the seventh selection method, when generating multiple modulated signals, the transmitting device selects a precoding matrix to be used for precoding from among multiple precoding matrices. When the transmitting device selects a precoding matrix that satisfies "one of equations (13) to (20) with θ ≠ 0," if the received electric field strengths of the multiple modulated signals transmitted by the transmitting device differ at the receiving device serving as the communication partner, the effect of improved data reception quality can be achieved (since each stream is transmitted from multiple antennas, a spatial diversity effect can be achieved).

[0911] On the other hand, when the transmitting device selects a precoding matrix that satisfies "one of equations (13) to (20) with θ = 0", when the received electric field strengths of the multiple modulated signals sent by the transmitting device do not differ significantly in the receiving device serving as the communication counterpart, better data reception quality can be achieved.

[0912] Therefore, the transmitting apparatus can achieve an effect of improving data reception quality at the receiving apparatus of the communicating party by appropriately selecting a precoding matrix used when generating multiple modulated signals to be transmitted based on, for example, feedback information from the terminal.

[0913] Furthermore, the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth selection methods described in Embodiments 1 and 2 do not necessarily support all of the configured transmission methods. Furthermore, in the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth selection methods, transmission methods other than the configured transmission methods may be included in the selection candidates of the transmission device. Furthermore, a combination of these two methods is also possible.

[0914] For example, in the seventh selection method, in Embodiment 2, transmission method #7-1, transmission method #7-2, transmission method #7-3, transmission method #7-4, transmission method #7-5, transmission method #7-6, transmission method #7-7, transmission method #7-8, and transmission method #7-9 are listed as selection candidates for the transmission method of the transmission device. In this case, all of transmission methods #7-1 through #7-9 may not be included as selection candidates for the transmission device. Furthermore, transmission methods other than transmission methods #7-1 through #7-9 may be included as selection candidates for the transmission device.

[0915] Record specific examples.

[0916] Example 1:

[0917] The selection candidates of the transmission device are set to "Transmission method #7-1, Transmission method #7-2, Transmission method #7-3, Transmission method #7-4, Transmission method #7-5, Transmission method #7-6, Transmission method #7-8, Transmission method #7-9".

[0918] Example 2:

[0919] The selection candidates for the transmission device are set to "Transmission Method #7-1, Transmission Method #7-2, Transmission Method #7-3, Transmission Method #7-4, Transmission Method #7-5, Transmission Method #7-6, Transmission Method #7-7, Transmission Method #7-8, Transmission Method #7-9 and Transmission Method #A".

[0920] For example, let transmission method #A be the following transmission method.

[0921] The modulation mode of transmitting a single stream (s1(i)) is set to 256QAM (or 256APSK (Amplitude Phase Shift Keying) or a modulation mode with 256 signal points in the in-phase I-quadrature Q plane) (wherein the modulated signal of a single stream can be transmitted using one antenna or multiple antennas).

[0922] Example 3:

[0923] The selection candidates for the transmission device are set to "Transmission Method #7-1, Transmission Method #7-2, Transmission Method #7-3, Transmission Method #7-4, Transmission Method #7-5, Transmission Method #7-6, Transmission Method #7-8, Transmission Method #7-9, and Transmission Method #A."

[0924] In addition, although Example 1, Example 2, and Example 3 are described as specific examples, the present invention is not limited thereto.

[0925] Furthermore, if a transmission device is configured with the 7'th selection method from transmission method #7'-1 to transmission method #7'-9, the data reception quality is improved in the receiving device of the communication partner.

[0926] 7th' selection method:

[0927] Sending method #7'-1:

[0928] The modulation mode of transmitting a single stream (s1(i)) is set to BPSK (or π / 2 shift BPSK) (wherein the modulation signal of a single stream can be transmitted using one antenna or multiple antennas).

[0929] Sending method #7'-2:

[0930] The modulation mode of transmitting a single stream (s1(i)) is set to QPSK (or π / 2 phase shift QPSK) (wherein the modulated signal of a single stream can be transmitted using one antenna or multiple antennas).

[0931] Sending method #7'-3:

[0932] The modulation method for transmitting a single stream (s1(i)) is set to 16QAM (or π / 2 phase-shifted 16QAM) (or a modulation method such as 16APSK in which there are 16 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0933] Sending method #7'-4:

[0934] The modulation method for transmitting a single stream (s1(i)) is set to 64QAM (or π / 2 phase-shifted 64QAM) (or a modulation method such as 64APSK in which there are 64 signal points in the in-phase I-quadrature Q plane (phase shift can also be implemented)) (wherein the single-stream modulated signal can be transmitted using one antenna or multiple antennas).

[0935] Sending method #7'-5:

[0936] The modulation method of s1(i) is set to BPSK (or π / 2 phase shift BPSK) when transmitting two streams (s1(i) and s2(i)), and the modulation method of s2(i) is set to BPSK (or π / 2 phase shift BPSK). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0937] The precoding process here will be described.

[0938] exist Figure 1 In the transmitting device, it is assumed that a certain coding rate is set as error correction coding. In this case, for the precoding process, a plurality of precoding matrices represented by one of equations (13) to (20) are prepared. For example, as precoding matrices, N (N is an integer greater than or equal to 2) precoding matrices are prepared. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)". (The i-th matrix is ​​represented by one of equations (13) to (20)).

[0939] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0940] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0941] Sending method #7'-6:

[0942] The modulation method of s1(i) is set to QPSK (or π / 2 shift QPSK) for transmitting two streams (s1(i) and s2(i)), and the modulation method of s2(i) is set to QPSK (or π / 2 shift QPSK). In this case, two modulated signals are transmitted, and the first modulated signal is transmitted using one or more antennas, and the second modulated signal is transmitted using one or more antennas. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0943] The precoding process here will be described.

[0944] exist Figure 1 In the transmitting device, it is assumed that a certain coding rate is set as error correction coding. In this case, for the precoding process, a plurality of precoding matrices represented by one of equations (13) to (20) are prepared. For example, as precoding matrices, N (N is an integer greater than or equal to 2) precoding matrices are prepared. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)". (The i-th matrix is ​​represented by one of equations (13) to (20)).

[0945] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0946] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0947] Sending method #7'-7:

[0948] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to QPSK (or π / 2 phase shift QPSK), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , use one of the (precoding) matrices of equations (13) to (20) for precoding (weighted synthesis), and then perform phase change (by the phase change unit 205B) and send. (In addition, there is also a case where the phase change is not performed, and coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ≠0 radians (in addition, it is assumed that θ is greater than 0 radians and less than 2π radians (0 radians ≤ θ < 2π radians)). If it is set to (θ = π / 4 radians (45 degrees), the average transmission power of the modulated signal sent from each antenna is equal).

[0949] Sending Method #7'-8:

[0950] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 16QAM (or π / 2 phase shift 16QAM) (or a modulation method such as 16APSK with 16 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0951] The precoding process here will be described.

[0952] exist Figure 1 In the transmitting device, it is assumed that a certain coding rate is set as error correction coding. In this case, for the precoding process, a plurality of precoding matrices represented by one of equations (13) to (20) are prepared. For example, as precoding matrices, N (N is an integer greater than or equal to 2) precoding matrices are prepared. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)". (The i-th matrix is ​​represented by one of equations (13) to (20)).

[0953] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0954] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0955] Sending Methods #7'-9:

[0956] The modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). At this time, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices of equations (13) to (20), and then, phase change is performed (by phase changer 205B) and transmitted. (Also, phase change may not be performed, and coefficient multiplication may be performed (by coefficient multiplication units 301A and 302A)). In this case, in equations (13) to (20), it is assumed that 0≠0 radians (in addition, θ is assumed to be greater than or equal to 0 radians and less than 2π radians (0 radians ≤ θ < 2π radians)).

[0957] Or the modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 16APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). In this case, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices of equations (13) to (20), and then, phase change is performed (by the phase change unit 205B) and transmitted. (Also, it is also possible not to perform phase change, and there are also cases where coefficient multiplication is performed (by the coefficient multiplication units 301A and 302A)). At this time, in equations (13) to (20), it is assumed that θ = 0 radians (although θ is greater than or equal to 0 radians and less than or equal to 2π radians (0 radians ≤ θ < 2π radians)).

[0958] Or the modulation method of s1(i) for sending two streams (s1(i) and s2(i)) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)), and the modulation method of s2(i) is set to 64QAM (or π / 2 phase shift 64QAM) (or a modulation method such as 64APSK with 64 signal points in the in-phase I-orthogonal Q plane (phase shift can also be implemented)). In this case, two modulated signals are sent, and the first modulated signal is sent using more than one antenna, and the second modulated signal is sent using more than one antenna. In addition, the two streams are based on Figure 2 、 Figure 3 , precoding (weighted synthesis) is performed using one of the (precoding) matrices in equations (13) to (20), and then a phase change is performed (by phase changer 205B) and transmitted. (Alternatively, there is also the case where coefficient multiplication is performed (by coefficient multiplication units 301A and 302A)) without performing a phase change.

[0959] The precoding process here will be described.

[0960] exist Figure 1 In the transmitting device, it is assumed that a certain coding rate is set as error correction coding. In this case, for the precoding process, a plurality of precoding matrices represented by one of equations (13) to (20) are prepared. For example, as precoding matrices, N (N is an integer greater than or equal to 2) precoding matrices are prepared. Here, the N precoding matrices are named "i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)". (The i-th matrix is ​​represented by one of equations (13) to (20)).

[0961] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0962] In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ=0". In addition, among the N matrices, there is at least one "precoding matrix that satisfies one of the equations (13) to (20) with θ≠0".

[0963] In addition, although "a certain coding rate is set as error correction coding" is described in transmission methods #7'-5, #7'-6, #7'-8, and #7'-9, the coding rate is not limited to one.

[0964] For example, at a coding rate of 1 / 2, "for precoding processing, a plurality of precoding matrices represented by one of equations (13) to (20) are prepared. For example, as precoding matrices, N (N is an integer greater than or equal to 2) precoding matrices are prepared. Here, the N precoding matrices are named "the i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)." (The i-th matrix is ​​represented by one of equations (13) to (20)).

[0965] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0966] In addition, among the N matrices, at least one "precoding matrix that satisfies any one of equations (13) to (20) with θ=0" is included. In addition, among the N matrices, at least one "precoding matrix that satisfies any one of equations (13) to (20) with θ≠0" is included. At a coding rate of 2 / 3, "for precoding processing, multiple precoding matrices represented by any one of equations (13) to (20) are prepared. For example, as precoding matrices, N (N is an integer greater than or equal to 2) precoding matrices are prepared. Here, the N precoding matrices are named "the i-th matrix (i is an integer greater than or equal to 1 and less than or equal to N)". (The i-th matrix is ​​represented by any one of equations (13) to (20)).

[0967] and, Figure 2 、 Figure 3 Based on the control signal 200 , the weighted combination unit 203 performs precoding using one matrix designated by the control signal 200 among the N matrices from the first matrix to the Nth matrix.

[0968] In addition, at least one "precoding matrix that satisfies any one of equations (13) to (20) with θ=0" may be included among the N matrices. Alternatively, at least one "precoding matrix that satisfies any one of equations (13) to (20) with θ≠0" may be included among the N matrices.

[0969] Furthermore, in the seventh selection method, it is not necessary to support all the transmission methods of the configuration. Furthermore, in the seventh selection method, the selection candidates of the transmission device may include transmission methods other than the transmission methods of the configuration. Furthermore, a combination of the two may be used.

[0970] For example, in the 7' selection method, as the transmission method, transmission method #7'-1, transmission method #7'-2, transmission method #7'-3, transmission method #7'-4, transmission method #7'-5, transmission method #7'-6, transmission method #7'-7, transmission method #7'-8, and transmission method #7'-9 are described as selection candidates for the transmission method of the transmission device. In this case, all of transmission methods #7'-1 to #7'-9 may not be included as selection candidates for the transmission device. In addition, transmission methods other than transmission methods #7'-1 to #7'-9 may be included in the selection candidates for the transmission device.

[0971] Record specific examples.

[0972] Example 4:

[0973] The selection candidates of the transmission device are set to "Transmission method #7'-1, Transmission method #7'-2, Transmission method #7'-3, Transmission method #7'-4, Transmission method #7'-5, Transmission method #7'-6, Transmission method #7'-8, Transmission method #7'-9".

[0974] Example 5:

[0975] The selection candidates of the transmission device are set to "Transmission Method #7'-1, Transmission Method #7'-2, Transmission Method #7'-3, Transmission Method #7'-4, Transmission Method #7'-5, Transmission Method #7'-6, Transmission Method #7'-7, Transmission Method #7'-8, Transmission Method #7'-9 and Transmission Method #A".

[0976] Example 6:

[0977] The selection candidates of the transmission device are set to "Transmission Method #7'-1, Transmission Method #7'-2, Transmission Method #7'-3, Transmission Method #7'-4, Transmission Method #7'-5, Transmission Method #7'-6, Transmission Method #7'-8, Transmission Method #7'-9, and Transmission Method #A".

[0978] In addition, although Example 4, Example 5, and Example 6 are described as specific examples, the present invention is not limited thereto.

[0979] (Implementation 3)

[0980] In this embodiment, Figure 1 、 Figure 22 The signal processing unit 106 in the transmitting device and Figure 2 、 Figure 23 Different structures are described.

[0981] Figure 24 Represents Figure 2 、 Figure 23 An example of a different structure of the signal processing unit 106, Figure 2 、 Figure 23 Parts that operate in the same manner are assigned the same numbers and their descriptions are omitted.

[0982] Figure 24 Especially with Figure 2 The difference is that two phase change units are provided immediately after the weighted synthesis unit 203.

[0983] Phase changer 205A receives weighted signal 204A and control signal 200 as input, applies a phase change to weighted signal 204A based on control signal 200, and outputs phase-changed signal 206A. As an example, weighted signal 204A is represented as z1'(t). Here, t represents time, and z1'(t) is defined by a complex number. Therefore, z1'(t) can also be a real number. Furthermore, phase-changed signal 206A is represented as z1(t). Here, z1(t) is defined by a complex number. Therefore, z1(t) can also be a real number. While z1'(t) and z1(t) are described as functions of t, they can also be functions of frequency f, or functions of both time t and frequency f. Furthermore, they can also be described as functions of symbol number i. Hereinafter, this description will be made as a function of symbol number i. Regarding this point, the same description and numerical expression will be used throughout this specification.

[0984] Phase changer 205B receives weighted signal 204B and control signal 200 as input, applies a phase change to weighted signal 204B based on control signal 200, and outputs phase-changed signal 206B. As an example, weighted signal 204B is represented as z2'(t). Here, t is time, and z2'(t) is defined by a complex number. Therefore, z2'(t) can also be a real number. Furthermore, phase-changed signal 206B is represented as z2(t). Here, z2(t) is defined by a complex number. Therefore, z2(t) can also be a real number. While z2'(t) and z2(t) are described as functions of t, they can also be functions of frequency f, or functions of both time t and frequency f. Furthermore, they can also be described as functions of symbol number i. Hereinafter, they will be described as functions of symbol number i.

[0985] The weighted combination unit (precoding unit) 203 performs the following calculations.

[0986] [Formula 55]

[0987]

[0988] In equation (55), a, b, c, and d can be defined using complex numbers and, therefore, real numbers. Furthermore, a specific example of the precoding matrix (equation (4)) composed of a, b, c, and d is described using equations (5) to (36) of embodiment 1.

[0989] In phase changer 205A, for example, a phase change of Y(i) is applied to z1'(i). Therefore, z1(i)=Y(i)×z1'(i). For example, symbol number i is an integer greater than 0.

[0990] Furthermore, in the phase changer 205B, for example, the phase change of y(i) is applied to z2'(i). Therefore, it can be expressed as z2(i)=y(i)×z2'(i).

[0991] Therefore, for example, z1(i) and z2(i) can be expressed by the following formula.

[0992] [Formula 56]

[0993]

[0994] Note that δ(i) and ε(i) are real numbers, and z1(i) and z2(i) are transmitted from the transmitting device at the same time and frequency (same frequency band).

[0995] For example, the phase change values ​​Y(i) and y(i) are given as follows.

[0996] [Formula 57]

[0997]

[0998] [Formula 58]

[0999]

[1000] In addition, N is the period of phase change, and N is an integer greater than 3, that is, an integer greater than the number of transmission streams or the number of transmission modulated signals, 2. In addition, Γ and Ω are real numbers. (As a simple example, Γ and Ω are assumed to be zero. However, this is not limited to this.) Under such settings, the PAPR (Peak-to-Average Power Ratio) of z1(i) and the PAPR of z2(i) are equivalent in the single-carrier mode, and thus, Figure 1 , Figure 22This makes the phase noise and transmission power amplifier linearity requirements of wireless units 107_A and 107_B equivalent, facilitating low power consumption and enabling the use of a common wireless unit configuration. (This is likely to be achieved with multi-carrier schemes such as OFDM.)

[1001] Alternatively, the phase change values ​​Y(i) and y(i) may be given as follows.

[1002] [Formula 59]

[1003]

[1004] [Formula 60]

[1005]

[1006] Even if given as in equations (59) and (60), the same effect as above can be obtained.

[1007] The phase change values ​​Y(i) and y(i) can also be given as follows.

[1008] [Formula 61]

[1009]

[1010] [Formula 62]

[1011]

[1012] In addition, k is an integer other than 0. Even if it is given as Formula (61) and Formula (62), the same effect as above can be obtained.

[1013] The method of giving the phase change values ​​Y(i), y(i) is not limited to the above example. Figure 24 When the precoding matrix used by the weighted synthesis unit 203 is expressed as in equations (33) and (34), Figure 24 Weighted synthesis unit 203 in the image processing apparatus 200 does not perform signal processing on mapped signals 201A and 201B, but outputs mapped signal 201A as weighted synthesized signal 204A and outputs mapped signal 201B as weighted synthesized signal 204B. In other words, weighted synthesis unit 203 may not be present. If weighted synthesis unit 203 is present, whether weighted synthesis is performed or not may be controlled by control signal 200.

[1014] Next, as Figure 1 、 Figure 22 The signal processing unit 106 in the transmitting device and Figure 2 、 Figure 23 、 Figure 24 Different structures Figure 25 The structure of .

[1015] exist Figure 25 In the Figure 24 Parts that operate in the same manner are given the same numbers and their descriptions are omitted. Figure 24 and Figure 25 The difference is that Figure 24 The phase change unit 209B present in Figure 25 This does not exist in Figure 23 It is explained in the description, so the description is omitted.

[1016] And, about Figure 25 The weighted synthesis unit 203, phase change unit 205A, 205B in the operation, due to the Figure 24 The same operation is performed as described in the previous section, so the description is omitted. Figure 25 When the precoding matrix used by the weighted synthesis unit 203 is expressed as in equations (33) and (34), Figure 24 In the weighted synthesis unit 203, mapped signals 201A and 201B are not subjected to signal processing, but are output as weighted synthesized signal 204A and as weighted synthesized signal 204B respectively. Specifically, weighted synthesis unit 203 may not be present. If weighted synthesis unit 203 is present, whether weighted synthesis is performed or not may be controlled by control signal 200.

[1017] Even if Figure 1 、 Figure 22 The structure of the signal processing unit 106 in the transmitting device is made as described in this embodiment. Figure 24 、 Figure 25 , for those with Figure 24 、 Figure 25 structure Figure 1 , Figure 22 The sending device can be implemented in combination with the various embodiments described in this specification, and each embodiment can be implemented in the same manner, and the effects described in the various embodiments can be obtained in the same manner.

[1018] (Supplement 3)

[1019] In this embodiment, Figure 1 、 Figure 22 The signal processing unit 106 in the transmitting device and Figure 2 、 Figure 23 、 Figure 24 、 Figure 25Different structures are described.

[1020] This embodiment Figure 1 、 Figure 22 The structure of the signal processing unit 106 in the transmitting device is as follows: Figure 23 or Figure 25 Connected Figure 26 、 Figure 27 、 Figure 28 、 Figure 29 or Figure 30 In addition, regarding Figure 23 and Figure 25 , as explained above, so the following is Figures 26 to 30 The structure of .

[1021] Figure 26 yes Figure 23 、 Figure 25 The first structure after the insertion part 207A and after the insertion part 207B.

[1022] exist Figure 26 In the Figure 23 、 Figure 25 Parts that operate in the same manner are assigned the same numbers and their descriptions are omitted.

[1023] CDD (Cyclic Delay Diversity) unit 2601A receives signal 208A and control signal 200 as input, performs CDD processing on signal 208A based on control signal 200, and outputs a CDD-processed signal 2602A. CDD may also be referred to as CSD (Cyclic Shift Diversity).

[1024] Figure 26 The CDD processed signal 2602A is equivalent to Figure 1 、 Figure 22 The processed signal 106_A and signal 208B are equivalent to Figure 1 、 Figure 22 The signal in the signal processing is signal 106_B.

[1025] Figure 27 yes Figure 23 、 Figure 25 The second structure after the insertion part 207A and after the insertion part 207B.

[1026] exist Figure 27 In, about Figure 23 、 Figure 25 Parts that operate in the same manner are assigned the same numbers and their descriptions are omitted.

[1027] The CDD unit 2601B receives the signal 208B and the control signal 200 as input, performs CDD processing on the signal 208B based on the control signal 200, and outputs a signal 2602B after the CDD processing.

[1028] Figure 27 The signal 208A in the Figure 1 、 Figure 22 The signal 106_A after signal processing and the signal 2602B after CDD processing are equivalent to Figure 1 、 Figure 22 The signal in the signal processing is signal 106_B.

[1029] Figure 28 yes Figure 23 、 Figure 25 The third structure after the insertion part 207A and after the insertion part 207B.

[1030] exist Figure 28 In, about Figure 23 、 Figure 25 、 Figure 26 、 Figure 27 Parts that operate in the same manner are assigned the same numbers and their descriptions are omitted.

[1031] Figure 27 The CDD processed signal 2602A is equivalent to Figure 1 、 Figure 22 The signal 106_A after signal processing and the signal 2602B after CDD processing are equivalent to Figure 1 、 Figure 22 The signal in the signal processing is signal 106_B.

[1032] Figure 29 yes Figure 23 、 Figure 25 The fourth structure after the insertion part 207A and after the insertion part 207B.

[1033] exist Figure 29 In, about Figure 23 、 Figure 25 Parts that operate in the same manner are assigned the same numbers and their descriptions are omitted.

[1034] Phase changer 209A receives signal 208A and control signal 200 as input, performs phase change processing on signal 208A based on control signal 200, and outputs signal 210A after phase change. Figure 2 The phase change unit 209B in is the same, so the description is omitted.

[1035] Figure 29 The phase-changed signal 210A is equivalent to Figure 1 、 Figure 22 The processed signal 106_A and signal 208B are equivalent to Figure 1 、 Figure 22 The signal in the signal processing is signal 106_B.

[1036] Figure 30 yes Figure 23 、 Figure 25 The fifth structure after the insertion part 207A and after the insertion part 207B.

[1037] exist Figure 30 In, about Figure 2 、 Figure 23 、 Figure 25 、 Figure 29 Parts that operate in the same manner are assigned the same numbers and their descriptions are omitted.

[1038] Figure 30 The phase-changed signal 210A is equivalent to Figure 1 、 Figure 22 The signal 106_A after signal processing and the signal 210B after phase change are equivalent to Figure 1 、 Figure 22 The signal in the signal processing is signal 106_B.

[1039] If Figure 1 、 Figure 22 The structure of the signal processing unit in the sending device is made into the structure described above. For such a sending device combined with the various embodiments described in this specification, each embodiment can also be implemented in the same way, and the effects described in each embodiment can be obtained in the same way.

[1040] Next, the operations of the CDD units 2601A, 2601B and the phase changers 209A, 209B are described.

[1041] First, the processing of CDD will be described.

[1042] exist Figure 31 The structure when CDD (CSD) is used is shown in FIG. The part that performs the same processing as the CDD parts 2601A and 2601B is Figure 31 3102_1~3102_M.

[1043] Cyclic delay unit 3102_1 takes modulated signal 3101 as input, performs cyclic delay processing, and outputs cyclically delayed signal 3103_1. If cyclically delayed signal 3103_1 is X1[n], then X1[n] is given by the following equation.

[1044] [Formula 63]

[1045] X1[n]=X[(n-δ1)mod N]…Equation (63)

[1046] In addition, mod stands for modulo, and "y mod Z" is the remainder when y is divided by Z. Furthermore, δ1 is the cyclic delay (δ1 is an integer), and x[n] consists of N samples (N is an integer greater than or equal to 2). Therefore, n is an integer greater than or equal to 0 and less than or equal to N-1.

[1047] Cyclic delay unit 3102_M takes modulated signal 3101 as input, performs cyclic delay processing, and outputs cyclically delayed signal 3103_M. If cyclically delayed signal 3103_M is XM[n], then XM[n] is given by the following equation.

[1048] [Formula 64]

[1049] XM[n]=X[(n-δM)modN]…Equation (64)

[1050] In addition, δM is a cyclic delay amount (δM is an integer), X[n] is composed of N samples (N is an integer greater than or equal to 2), and therefore, n is an integer greater than or equal to 0 and less than or equal to N-1.

[1051] Therefore, cyclic delay unit 3102_i (where i is an integer greater than or equal to 1 and less than or equal to M (M is an integer greater than or equal to 1)) receives modulated signal 3101 as input, performs cyclic delay processing, and outputs cyclically delayed signal 3103_i. If cyclically delayed signal 3103_i is Xi[n], Xi[n] is given by the following equation.

[1052] [Formula 65]

[1053] Xi[n]=X[(n-δi)mod N]…Equation (65)

[1054] In addition, δi is a cyclic delay amount (δi is an integer), X[n] is composed of N samples (N is an integer greater than or equal to 2), and therefore, n is an integer greater than or equal to 0 and less than or equal to N-1.

[1055] Then, the cyclically delayed signal 3103_i is transmitted from antenna i. Thus, the cyclically delayed signals 3103_1, ..., and the cyclically delayed signal 3103_M are transmitted from different antennas.

[1056] This makes it possible to obtain a diversity effect due to cyclic delay (particularly, to reduce the adverse effects of delayed waves), and improve the quality of data reception in the receiving apparatus.

[1057] The relationship between the CDD units 2601A and 2601B and the phase change units 209A and 209B will be described.

[1058] For example, consider the case of applying CDD (CSD) to OFDM.

[1059] If the carrier with the lowest frequency is defined as "carrier 1", then it is arranged as "carrier 2", "carrier 3", "carrier 4" and so on.

[1060] Phase changers 209A and 209B introduce a cyclic delay τ, similar to CDD units 2601A and 2601B. Therefore, the phase change value Ω[i] for carrier i is expressed as follows.

[1061] [Formula 66]

[1062] Ω[i]=e j×μ×i …Formula (66)

[1063] Note that μ is a value that can be determined from the cyclic delay amount, FFT (Fast Fourier Transform) size, and the like.

[1064] Furthermore, if the baseband signal of "carrier i" at time t before the phase change (before the cyclic processing delay) is v'[i][t], then the signal v[i][t] of "carrier i" at time t after the phase change can be expressed as v[i][t] = Ω[i] × v'[i][t].

[1065] Therefore, the phase changers 209A and 209B also perform phase change operations by providing cyclic delay amounts.

[1066] And, in Figure 2 、 Figure 23 、 Figure 24 、 Figure 25 Phase changers 205A and 205B in the examples may also be controlled to perform or not perform phase changes based on control signal 200 as input. Thus, for example, control signal 200 may include control information regarding whether phase changer 205A performs or does not perform phase change, and control information regarding whether phase changer 205B performs or does not perform phase change. This control information can be used to control whether phase changers 205A and 205B perform or do not perform phase change.

[1067] Phase changer 205A receives control signal 200 as input. When receiving an instruction from control signal 200 not to perform a phase change, phase changer 205A outputs input signal 204A as 206A.

[1068] Similarly, phase changer 205B receives control signal 200 as input. When receiving an instruction from control signal 200 not to perform a phase change, phase changer 205B outputs input signal 204B as signal 206B.

[1069] In addition, the transmitting device transmits information about "implementation or non-implementation of phase change" in phase change units 205A and 205B as part of a control information symbol to notify the receiving device serving as the communication partner.

[1070] In addition, Figure 2 、 Figure 24 、 Figure 26 、 Figure 27 、 Figure 28 、 Figure 29 、 Figure 30 In phase changers 209A and 209B and CDD units 2601A and 2601B, control signal 200 as input may be used to control whether phase change is performed or not. Furthermore, control signal 200 as input may be used to control whether CSD processing is performed or not. Thus, for example, control signal 200 may include control information regarding whether phase changer 205A performs phase change, control information regarding whether phase changer 205B performs phase change, control information regarding whether CDD unit 2601A performs CDD processing, and control information regarding whether CDD unit 2601B performs CDD processing. This control information may be used to control whether phase changers 209A and 209B perform phase change, and whether CDD units 2601A and 2601B perform CDD processing.

[1071] Phase changer 209A receives control signal 200 as input. When receiving an instruction not to perform a phase change through control signal 200, phase changer 209A outputs input signal 208A as 210A.

[1072] Similarly, phase changer 209B receives control signal 200 as input. When receiving an instruction not to perform a phase change through control signal 200, phase changer 209B outputs input signal 208B as 210B.

[1073] The CDD unit 2601A receives the control signal 200 as input. When receiving an instruction not to perform CDD processing from the control signal 200, the CDD unit 2601A outputs the input signal 208A as 2602A.

[1074] Similarly, the CDD unit 2601B receives the control signal 200 as input, and when receiving an instruction not to perform CDD processing through the control signal 200, the CDD unit 2601B outputs the input signal 208B as 2602B.

[1075] In the present invention, when there is a complex plane, the unit of phase, such as deflection angle, is radian.

[1076] If the complex plane is used, it can be displayed in polar form as a display of complex number polar coordinates. When a point (a, b) on the complex plane is associated with a complex number z = a + jb (a, b are real numbers, j is an imaginary unit), the point is expressed in polar coordinates as [r, θ], then a = r × cos θ, b = r × sin θ

[1077] [Formula 67]

[1078]

[1079] holds true, r is the absolute value of z (r=|z|), θ is the angle of deflection (argument). Furthermore, z=a+jb can be expressed as r×ejθ.

[1080] (Supplement 4)

[1081] In this embodiment 1 Figure 3 Supplementary explanation of the description.

[1082] The following describes a case where the modulation scheme of the mapped signal 201A (s1(i)) is QPSK (Quadrature Phase Shift Keying) and the modulation scheme of the mapped signal 201B (s2(i)) is 16QAM (QAM: Quadrature Amplitude Modulation).

[1083] Furthermore, it is assumed that the average (transmitted) power of the mapped signal 201A is equal to the average (transmitted) power of the mapped signal 201B.

[1084] In the embodiment 1 Figure 3 While the description of the operation when phase changer 205B is present has been described, there are also methods for improving data reception quality when phase changer 205B is not performing a phase change, or when phase changer 205B is not present. This will be explained below.

[1085] Assume that the signal after weighted synthesis is 204A (Z1(i)) and the signal without phase change is z2(i) (equivalent to 204B. However, 204B and 206B are the same signal). Figure 4 , the weighted synthesized signal 204A (Z1(i)) and the signal z2(i) without phase change can be expressed using any of equations (68) to (75). Furthermore, F, u, v, β, θ, etc. are as described in the first embodiment.

[1086] [Formula 68]

[1087]

[1088] [Formula 69]

[1089]

[1090] [Formula 70]

[1091]

[1092] [Formula 71]

[1093]

[1094] [Formula 72]

[1095]

[1096] [Formula 73]

[1097]

[1098] [Formula 74]

[1099]

[1100] [Formula 75]

[1101]

[1102] Alternatively, the modulation scheme of the mapped signal 201A (s1(i)) may be 16QAM, and the modulation scheme of the mapped signal 201B (s2(i)) may be QPSK.

[1103] Furthermore, it is assumed that the average (transmitted) power of the mapped signal 201A is equal to the average (transmitted) power of the mapped signal 201B.

[1104] At this time, if based on Figure 4 ,but Figure 3The weighted synthesized signal 204A (z1(i)) and the phase-changed signal 206B (z2(i)) can be expressed by any of equations (76) to (83). Furthermore, F, u, v, β, θ, etc. are as described in the first embodiment.

[1105] [Formula 76]

[1106]

[1107] [Formula 77]

[1108]

[1109] [Formula 78]

[1110]

[1111] [Formula 79]

[1112]

[1113] [Formula 80]

[1114]

[1115] [Formula 81]

[1116]

[1117] [Formula 82]

[1118]

[1119] [Formula 83]

[1120]

[1121] Alternatively, the modulation scheme of the mapped signal 201A (s1(i)) may be 16QAM, and the modulation scheme of the mapped signal 201B (s2(i)) may be 64QAM.

[1122] Furthermore, it is assumed that the average (transmitted) power of the mapped signal 201A is equal to the average (transmitted) power of the mapped signal 201B.

[1123] at this time, Figure 3 The weighted combined signal 204A (z1(i)) and the phase-changed signal 206B (z2(i)) can be expressed by any of equations (84) to (91). Furthermore, F, u, v, β, θ, etc. are as described in the first embodiment.

[1124] [Formula 84]

[1125]

[1126] [Formula 85]

[1127]

[1128] [Formula 86]

[1129]

[1130] [Formula 87]

[1131]

[1132] [Formula 88]

[1133]

[1134] [Formula 89]

[1135]

[1136] [Formula 90]

[1137]

[1138] [Formula 91]

[1139]

[1140] exist Figure 32 In the middle, it means P 16QAM is the average (transmit) power of 16QAM, P 64QAM is the average (transmitted) power of 64QAM, and the horizontal axis is P 16QAM / (P 16QAM +P 64QAM ), the vertical axis represents the capacity of each SNR (Signal-to-Noise power Ratio) when the capacity is represented (in addition, the channel model in the graph is an AWGN (Additive White Gaussian Noise) environment). According to the results, it can be seen that by setting the equations (84) to (91), the receiving device can obtain the effect of obtaining good data reception quality. In addition, Figure 32 In the graph, the 21 curves showing the relationship between the power ratio and the capacity correspond to SNR=0dB, 1dB, 2dB, ..., 20dB in order from the lower capacity.

[1141] Alternatively, the modulation scheme of the mapped signal 201A (s1(i)) may be 64QAM, and the modulation scheme of the mapped signal 201B (s2(i)) may be 16QAM.

[1142] Furthermore, it is assumed that the average (transmitted) power of the mapped signal 201A is equal to the average (transmitted) power of the mapped signal 201B.

[1143] At this time, if based on Figure 32 ,but Figure 3 The weighted combined signal 204A (z1(i)) and the phase-changed signal 206B (z2(i)) can be expressed by any of equations (92) to (99). Furthermore, F, u, v, β, θ, etc. are as described in the first embodiment.

[1144] [Formula 92]

[1145]

[1146] [Formula 93]

[1147]

[1148] [Formula 94]

[1149]

[1150] [Formula 95]

[1151]

[1152] [Formula 96]

[1153]

[1154] [Formula 97]

[1155]

[1156] [Formula 98]

[1157]

[1158] [Formula 99]

[1159]

[1160] When the modulation method of the mapped signal 201A (s1(i)) is 16QAM and the modulation method of the mapped signal 201B (s2(i)) is 64QAM, in the embodiment 1, Figure 3 While the description of the operation when phase changer 205B is present has been described, there are also methods for improving data reception quality when phase changer 205B is not performing a phase change, or when phase changer 205B is not present. This will be explained below.

[1161] Assume that the signal after weighted synthesis is 204A (Z1(i)) and the signal without phase change is z2(i) (equivalent to 204B. However, 204B and 206B are the same signal). Figure 32 , then the weighted combined signal 204A (Z1(i)) and the signal z2(i) without phase change can be expressed by any of equations (100) to (107). Furthermore, F, u, v, β, θ, etc. are as described in the first embodiment.

[1162] Furthermore, it is assumed that the average (transmitted) power of the mapped signal 201A is equal to the average (transmitted) power of the mapped signal 201B.

[1163] [Formula 100]

[1164]

[1165] [Formula 101]

[1166]

[1167] [Formula 102]

[1168]

[1169] [Formula 103]

[1170]

[1171] [Formula 104]

[1172]

[1173] [Formula 105]

[1174]

[1175] [Formula 106]

[1176]

[1177] [Formula 107]

[1178]

[1179] In addition, in equations (68) to (107), α and β can be either real numbers or imaginary numbers.

[1180] Furthermore, in equations (68) to (107), θ is set to π / 4 radians (45 degrees). The average (transmitted) power of signal 302A after coefficient multiplication differs from the average (transmitted) power of signal 302B after coefficient multiplication. However, by "setting θ to π / 4 radians (45 degrees)", the average (transmitted) power of signal 204A (z1(i)) after weighted synthesis can be made equal to the average (transmitted) power of signal 206B (204B) (z2(i)). In the case where the transmission regulations determine that the average transmitted power of the modulated signal transmitted from each antenna is constant, it is necessary to "set θ to π / 4 radians (45 degrees)". Also, here, "θ is set to π / 4 radians (45 degrees)", but "θ can be any value of π / 4 radians (45 degrees), (3×π) / 4 radians (135 degrees), (5×π) / 4 radians (225 degrees), or (7×π) / 4 radians (315 degrees)."

[1181] In addition, the coefficients u and v are set as shown in equations (68) to (107).

[1182] In addition, it is described Figure 1 、 Figure 2 、 Figure 3 The method using equations (1) to (45) as an example generates code elements (for example, z1(i), z2(i)). In this case, the generated code elements can also be arranged in the time axis direction. In addition, when a multi-carrier method such as OFDM (Orthogonal Frequency Division Multiplexing) is used, the generated code elements can also be arranged in the frequency axis direction or in the time-frequency direction. In addition, the generated code elements can also be interleaved (rearranged) and arranged in the time axis direction, in the frequency axis direction, or in the time-frequency axis direction. However, z1(i) and z2(i) with the same code element number i are sent by the transmitting device using the same time and the same frequency (the same frequency band).

[1183] In addition, Figure 3 In the embodiment, a phase changer 205A may be provided between the weighted combination unit 203 and the insertion unit 207A. In this way, the phase of the weighted-combined signal 204A can also be changed.

[1184] Furthermore, phase changer 209A may be disposed after insertion unit 207A. Furthermore, phase changer 209B may not be present.

[1185] By implementing the above, weighted combining and power changes are performed to increase capacity, thereby improving the data reception quality of the receiving device serving as the communication partner. Furthermore, when the modulation schemes of s1(i) and s2(i) are changed over time or frame by frame, more appropriate power values ​​u and v are set.

[1186] In the above example, it is described that when the modulation method of the mapped signal 201A (s1(i)) is 16QAM and the modulation method of the mapped signal 201B (s2(i)) is 64QAM, the weighted synthesized signal 204A (z1(i)) and the weighted synthesized signal 206B (z2(i)) can be expressed by any of equations (84) to (91) and equations (100) to (107). However, it is also possible to express the weighted synthesized signal 204A (z1(i)) and the weighted synthesized signal 206B (z2(i)) by using the following equations: The values ​​of u and v in equations (84) to (91) and (100) to (107) are switched based on the encoding method of the error correction code used when generating the data, as contained in the signal s1(i) and the mapped signal s2(i). For example, assume that there is a first error correction code with a code length (block length) of A (A is an integer greater than or equal to 2) and a second error correction code with a code length (block length) of B (B is an integer greater than or equal to 2). Furthermore, assume that A ≠ B.

[1187] In this case, when the first error correction code is used, let the value of u in equations (84) to (91) and (100) to (107) be ua, and the value of v be va. When the second error correction code is used, let the value of u in equations (84) to (91) and (100) to (107) be ub, and the value of v be vb. In this case, equation (108) holds.

[1188] [Formula 108]

[1189]

[1190] As another example, assume that there is a third error-correcting code with a coding rate of C (C is a real number greater than 0 and less than 1) and a fourth error-correcting code with a coding rate of D (D is a real number greater than 0 and less than 1). Furthermore, let C ≠ D. In this case, when the third error-correcting code is used, let the value of u in equations (84) to (91) and equations (100) to (107) be uc, and the value of v be vc. When the fourth error-correcting code is used, let the value of u in equations (84) to (91) and equations (100) to (107) be ud, and the value of v be vd. In this case, equation (109) holds.

[1191] [Formula 109]

[1192]

[1193] As another example, assume that there is a fifth error correction code whose error correction coding method is E and a sixth error correction code whose error correction coding method is F. Also, assume that the error correction coding method E and the error correction coding method F are different methods.

[1194] At this time, when the fifth error correction code is used, let the value of u in equations (84) to (91) and (100) to (107) be ue, and the value of v be ve. When the sixth error correction code is used, let the value of u in equations (84) to (91) and (100) to (107) be uf, and the value of v be vf. In this case, equation (110) holds.

[1195] [Formula 110]

[1196]

[1197] It is recorded that when the modulation mode of the mapped signal 201A (s1 (i)) is 64QAM and the modulation mode of the mapped signal 201B (s2 (i)) is 16QAM, the weighted synthesized signal 204A (z1 (i)) and the weighted synthesized signal 206B (z2 (i)) can be expressed by one of the equations (92) to (99), but the values ​​of u and v in equations (92) to (99) can also be switched according to the encoding method of the error correction code used when generating data contained in the mapped signal 201A (s1 (i)) and the mapped signal 201B (s2 (i)).

[1198] For example, assume that there is a first error-correcting code with a code length (block length) of G (G is an integer greater than or equal to 2) and a second error-correcting code with a code length (block length) of H (H is an integer greater than or equal to 2). Furthermore, G≠H.

[1199] In this case, when the first error correction code is used, let the value of u in equations (92) to (99) be ug and the value of v be vg. When the second error correction code is used, let the value of u in equations (92) to (99) be uh and the value of v be vh. In this case, equation (111) holds.

[1200] [Formula 111]

[1201]

[1202] As another example, assume that there is a third error-correcting code with a coding rate of I (I is a real number greater than 0 and less than 1) and a fourth error-correcting code with a coding rate of J (J is a real number greater than 0 and less than 1). Furthermore, I ≠ J. In this case, when the third error-correcting code is used, let the value of u in equations (92) to (99) be ui and the value of v be vi. When the fourth error-correcting code is used, let the value of u in equations (92) to (99) be uj and the value of v be vj. In this case, equation (112) holds.

[1203] [Formula 112]

[1204]

[1205] As another example, assume that there is a fifth error correction code whose error correction coding method is K and a sixth error correction code whose error correction coding method is M. Furthermore, assume that the error correction coding method K and the error correction coding method M are different methods.

[1206] At this time, when the fifth error correction code is used, let the value of u in equations (92) to (99) be uk and the value of v be vk. When the sixth error correction code is used, let the value of u in equations (92) to (99) be um and the value of v be vm. In this case, equation (113) holds.

[1207] [Formula 113]

[1208]

[1209] It is recorded that when the modulation mode of the mapped signal 201A (s1 (i)) is 16QAM and the modulation mode of the mapped signal 201B (s2 (i)) is 64QAM, the weighted synthesized signal 204A (z1 (i)) and the weighted synthesized signal 206B (z2 (i)) can be expressed by any of the equations (84) to (91) and (100) to (107), but the values ​​of u and v in equations (84) to (91) and (100) to (107) can also be switched according to the encoding method of the error correction code used when generating data contained in the mapped signal 201A (s1 (i)) and the mapped signal 201B (s2 (i)).

[1210] For example, as a first case, it is assumed that error correction coding method N is used for mapped signal 201A (s1(i)), and error correction coding method P is used for mapped signal 201B (s2(i)). As a second case, it is assumed that error correction coding method Q is used for mapped signal 201A (s1(i)), and error correction coding method R is used for mapped signal 201B (s2(i)).

[1211] Furthermore, it is assumed that "error correction coding method N is different from error correction coding method Q" or "error correction coding method P is different from error correction coding method R" holds true.

[1212] In this case, in the first case, let the value of u in equations (84) to (91) and (100) to (107) be un and the value of v be vn. In the second case, let the value of u in equations (84) to (91) and (100) to (107) be up and the value of v be vp. In this case, equation (114) holds.

[1213] [Formula 114]

[1214]

[1215] It is recorded that when the modulation mode of the mapped signal 201A (s1 (i)) is 64QAM and the modulation mode of the mapped signal 201B (s2 (i)) is 16QAM, the weighted synthesized signal 204A (z1 (i)) and the weighted synthesized signal 206B (z2 (i)) can be expressed by one of the equations (92) to (99), but the values ​​of u and v in equations (92) to (99) can also be switched according to the encoding method of the error correction code used when generating data contained in the mapped signal 201A (s1 (i)) and the mapped signal 201B (s2 (i)).

[1216] For example, as a third case, it is assumed that error correction coding method S is used for mapped signal 201A (s1(i)), and error correction coding method T is used for mapped signal 201B (s2(i)). As a fourth case, it is assumed that error correction coding method W is used for mapped signal 201A (s1(i)), and error correction coding method X is used for mapped signal 201B (s2(i)).

[1217] Furthermore, it is assumed that "error correction coding method S is different from error correction coding method W" or "error correction coding method T is different from error correction coding method X" holds true.

[1218] In this case, in the first case, let the value of u in equations (92) to (99) be us and the value of v be vs. In the second case, let the value of u in equations (92) to (99) be uw and the value of v be vw. In this case, equation (115) holds.

[1219] [Formula 115]

[1220]

[1221] In addition, in the above, it can be imagined that when the Yth error correction coding method is different from the Zth error correction coding method, the error correction coding method itself is different or the code length (block length) is different, the coding rate is different, etc.

[1222] In addition, in the above example, "the modulation mode of the mapped signal 201A (s1 (i)) is 16QAM, and the modulation mode of the mapped signal 201B (s2 (i)) is 64QAM" and "the modulation mode of the mapped signal 201A (s1 (i)) is 64QAM, and the modulation mode of the mapped signal 201B (s2 (i)) is 16QAM" are used as examples for explanation, but "the set of the modulation mode of the mapped signal 201A (s1 (i)) and the modulation mode of the mapped signal 201B (s2 (i))" is not limited to this example.

[1223] Furthermore, in the above example, when the modulation mode of the mapped signal 201A (s1 (i)) is 16QAM and the modulation mode of the mapped signal 201B (s2 (i)) is non-uniform 64QAM, the weighted synthesized signal 204A (z1 (i)) and the weighted synthesized signal 206B (z2 (i)) can be expressed by any of Equations (84) to (91) and (100) to (107).

[1224] Furthermore, it is assumed that the first non-uniform 64QAM mapping is used in the fifth case, and the second non-uniform 64QAM mapping is used in the sixth case. Furthermore, it is assumed that the first non-uniform 64QAM mapping is different from the second non-uniform 64QAM mapping.

[1225] At this time, when the first non-uniform 64QAM is used, let the value of u in equations (84) to (91) and equations (100) to (107) be u1, and let the value of v be v1. When the second non-uniform 64QAM is used, let the value of u in equations (84) to (91) and equations (100) to (107) be u2, and let the value of v be v2. In this case, equation (116) holds.

[1226] [Formula 116]

[1227]

[1228] In this example, the modulation scheme of the mapped signal 201A (s1(i)) may be a modulation scheme other than 16QAM.

[1229] As another example, when the modulation method of the mapped signal 201A (s1 (i)) is non-uniform 64QAM and the modulation method of the mapped signal 201B (s2 (i)) is 16QAM, the weighted synthesized signal 204A (z1 (i)) and the weighted synthesized signal 206B (z2 (i)) can also be expressed by one of equations (92) to (99).

[1230] Furthermore, it is assumed that the third non-uniform 64QAM mapping is used in the seventh case, and the fourth non-uniform 64QAM mapping is used in the eighth case. Furthermore, it is assumed that the third non-uniform 64QAM mapping is different from the fourth non-uniform 64QAM mapping.

[1231] At this time, when the third non-uniform 64QAM is used, let the value of u in equations (92) to (99) be u3, and let the value of v be v3. When the fourth non-uniform 64QAM is used, let the value of u in equations (92) to (99) be u4, and let the value of v be v4. In this case, equation (117) holds.

[1232] [Formula 117]

[1233]

[1234] In addition, in this example, the modulation method of the mapped signal 201B (s2(i)) may also be a modulation method other than 16QAM.

[1235] By doing the above, it is possible to achieve an effect in which higher data reception quality can be obtained in the receiving device.

[1236] (other)

[1237] In addition, in this manual, Figure 1 、 Figure 22 The processed signal 106_A is sent from multiple antennas. Figure 1 、 Figure 22 Signal 106_B, after signal processing, is transmitted from multiple antennas. Signal 106_A, after signal processing, may include, for example, any of signals 204A, 206A, 208A, 210A, or 2602A. Signal 106_B, after signal processing, may include, for example, any of signals 204B, 206B, 208B, 210B, or 2602B.

[1238] For example, assume there are N transmitting antennas, that is, there are transmitting antennas from antenna 1 to antenna N. In addition, N is an integer greater than or equal to 2. In this case, the modulated signal transmitted from transmitting antenna k is represented as ck. In addition, k is an integer greater than or equal to N. And, the vector C consisting of c1 to cN is represented as C = (c1, c2, ..., cN) T In addition, the transposed vector of vector A is represented as A T . At this time, when the precoding matrix (weighting matrix) is set to G, the following equation holds.

[1239] [Formula 118]

[1240]

[1241] Furthermore, let da(i) be the processed signal 106_A, db(i) be the processed signal 106_B, and let i be the symbol number. Furthermore, let G be a matrix with N rows and 2 columns, which can also be a function of i. Furthermore, G can be switched at a certain timing (i.e., it can also be a function of frequency or time).

[1242] Furthermore, the transmitting device can switch between "transmitting processed signal 106_A from multiple transmit antennas and transmitting processed signal 106_B from multiple transmit antennas" and "transmitting processed signal 106_A from a single transmit antenna and transmitting processed signal 106_B from a single transmit antenna." The switching timing can be frame-by-frame or can be performed when a modulated signal is determined to be transmitted (either switching timing is acceptable).

[1243] Alternatively, a configuration may be employed in which at least one of the FPGA (Field Programmable Gate Array) and the CPU (Central Processing Unit) can download all or part of the software required to implement the communication method described in the present invention via wireless or wired communication. Furthermore, a configuration may be employed in which all or part of the software for updating can be downloaded via wireless or wired communication. Furthermore...

Claims

1. A sending method, comprising: generating modulated quadrature phase shift keying (QPSK) points s1(i) by using bits of the first stream and generating modulated 16-quadrature amplitude modulation (QAM) points s2(i) by using bits of the second stream, where i is a symbol number; pass Multiply transforming the modulated QPSK point s1(i) into a first transformed point z1(i) and transforming the modulated 16-QAM point s2(i) into a second transformed point z2(i), wherein j is an imaginary unit and δ(i) is a real unit that increases by a constant value for each i; as well as One or more Orthogonal Frequency Division Multiplexing (OFDM) symbols are generated, the one or more OFDM symbols including the first transition point z1(i) and the second transition point z2(i).

2. The transmission method as claimed in claim 1, wherein the value of δ(i) changes periodically with a period N, wherein N is an integer.

3. The sending method as claimed in claim 2, wherein N is eight. 4 . The transmitting method according to claim 1 , wherein the constant value is 2π / N, where N is an integer greater than or equal to two.

5. The sending method according to claim 1, further comprising: The one or more OFDM symbols are transmitted using one or more antennas.

6. A sending device, comprising: a mapping section for generating modulated quadrature phase shift keying (QPSK) points s1(i) by using bits of the first stream and generating modulated 16-quadrature amplitude modulation (QAM) points s2(i) by using bits of the second stream, wherein i is a symbol number; A signal processing unit, the signal processing unit is used to transform the modulated QPSK point s1(i) into a first transformation point z1(i) and transform the modulated 16-QAM point s2(i) into a second transformation point z2(i), wherein the first transformation point z1(i) and the second transformation point z2(i) are defined as: where j is an imaginary unit and δ(i) is a real unit that increases by a constant value for each i; A generating unit, the generating unit is used to generate one or more orthogonal frequency division multiplexing (OFDM) codewords, the OFDM codewords include the first change point z1(i) and the second change point z2(i).

7. The transmitting apparatus as claimed in claim 6, wherein the value of δ(i) changes periodically with a period N, wherein N is an integer.

8. The transmitting apparatus of claim 7, wherein N is eight.

9. The transmitting device according to claim 6, wherein the constant value is 2π / N, where N is an integer greater than or equal to two.

10. The transmitting device as claimed in claim 6, wherein e jδ(i) is the phase change value.

11. The transmitting device according to claim 10, further comprising: A sending unit is used to send the one or more symbols using one or more antennas.

12. A receiving method, comprising: A received signal is obtained by receiving one or more orthogonal frequency division multiplexing (OFDM) symbols, the one or more OFDM symbols including a first transformed signal z1(i) and a second transformed signal z2(i) transmitted by using one or more antennas, wherein i is a symbol number, Wherein the first transformed signal z1(i) and the second transformed signal z2(i) are generated by transforming a quadrature phase shift keying (QPSK) point s1(i) and a 16-quadrature amplitude modulation (QAM) point s2(i), the QPSK point s1(i) being modulated by using bits of a first stream and the 16-QAM point s2(i) being modulated by using bits of a second stream, the first transformed signal z1(i) and the second transformed signal z2(i) being defined as: where j is an imaginary unit and δ(i) is a real unit that increases by a constant value for each i; The received signal is demodulated according to the transformation applied to the QPSK point s1(i) and the 16-QAM point s2(i).

13. The receiving method as claimed in claim 12, wherein the value of δ(i) changes periodically with a period N, wherein N is an integer.

14. The receiving method of claim 12, wherein N is eight.

15. The receiving method of claim 12, wherein the constant value is 2π / N, where N is an integer greater than or equal to two.

16. The receiving method as claimed in claim 12, wherein e jδ(i) is the phase change value.

17. A receiving device, comprising: A receiving unit, the receiving unit is used to obtain a received signal by receiving one or more orthogonal frequency division multiplexing (OFDM) symbols, wherein the one or more OFDM symbols include a first transformed signal z1(i) and a second transformed signal z2(i) transmitted by using one or more antennas, wherein i is a symbol number, The first transformed signal z1(i) and the second transformed signal z2(i) are obtained by Multiply and generating, wherein s1(i) is a modulated quadrature phase shift keying (QPSK) point and s2(i) is a modulated 16-quadrature amplitude modulation (QAM) point, wherein the modulated QPSK point s1(i) is generated by using the bits of the first stream and the modulated 16-QAM point s2(i) is generated by using the bits of the second stream, and wherein j is an imaginary unit, and δ(i) is a real unit that increases by a constant value for each i; as well as A demodulation unit, the demodulation unit is used to demodulate the received signal according to the transformation applied to the modulated QPSK point s1(i) and the modulated 16-QAM point s2(i).

18. The receiving apparatus of claim 17, wherein the value of δ(i) changes periodically with a period N, wherein N is an integer.

19. The receiving apparatus of claim 17, wherein N is eight.

20. The receiving device of claim 17, wherein the constant value is 2π / N, where N is an integer greater than or equal to two.

21. The receiving device as claimed in claim 17, wherein e jδ(i) is the phase change value.

22. A sending method, comprising: generating modulated 16-quadrature amplitude modulation (QAM) points s1(i) by using bits of the first stream and generating modulated quadrature phase shift keying (QPSK) points s2(i) by using bits of the second stream, wherein i is an integer greater than or equal to 0; The modulated 16-QAM point s1(i) is transformed into a first transformation point z1(i) and the modulated QPSK point s2(i) is transformed into a second transformation point z2(i), wherein the modulated 16-QAM point s1(i) is transformed into the first transformation point z1(i) and the modulated QPSK point s2(i) is transformed into the second transformation point z2(i) including: Multiply as well as One or more signals are generated including the first transformation point z1(i) and the second transformation point z2(i).

23. The transmission method according to claim 22, wherein the first transformation point z1(i) and the second transformation point z2(i) are defined as: where y(i) is given by e jδ(i) denoted by , where δ(i) is a real number that increases by a constant value for each i.

24. The transmission method of claim 23, wherein the value of y(i) changes periodically with a period of N, wherein N is 8.

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