Transmitting device and transmitting method

Abstract

The present invention provides a transmitting device and a transmitting method, wherein the transmitting device comprises: a signal processing circuit that generates a plurality of control signals generated by performing a cyclic shift diversity method, and a plurality of data streams generated by performing a first signal processing and a second signal processing; and a transmitter that transmits the plurality of control signals and the plurality of data streams via multiple antennas in a single carrier mode. In the first signal processing, a phase change of a plurality of data symbols of each data stream is performed according to a first phase change value that changes periodically. In the second signal processing, a phase change of a plurality of data streams is performed according to a plurality of second phase change values ​​that are certain and provided to each data stream.

Description

[0001] This application is a divisional application of Chinese patent application filed on October 5, 2016, with application number 201680058101.1 and invention title "Transmission Method, Transmission Apparatus, Receiving Method, Receiving Apparatus". Technical Field

[0002] This application particularly relates to a transmitting device and a receiving device for communication employing multiple antennas. Background Technology

[0003] In a line-of-sight (LOS) environment dominated by direct waves, as a transmission method to obtain good reception quality, there is a method described in Non-Patent Document 1, which employs a communication method using multiple antennas, such as a communication method called MIMO (Multiple-Input Multiple-Output).

[0004] (Existing technical literature)

[0005] (Non-patent literature)

[0006] Non-patent literature 1: "MIMO for DVB-NGH, the next generation mobile TV broadcasting", IEEE Commun. Mag., vol. 57, no. 7, pp. 130-137, July 2013.

[0007] Non-patent literature 2: "Standard conformable antenna diversity techniques for OFDM and its application to the DVB-T system", IEEE Globecom 2001, pp. 3100-3105, Nov. 2001.

[0008] Non-patent document 3: IEEE P802.11n (D3.00) Draft STANDARD for Information Technology-Telecommunications and information exchange between systems-Localand metropolitan area networks-Specific requirements-Part11: Wireless LANMedium Access Control (MAC) and Physical Layer (PHY) specifications, 2007. Summary of the Invention

[0009] Non-limiting embodiments of this application provide a transmitting apparatus that improves the quality of data reception in a propagation environment including LOS.

[0010] One aspect of this application relates to a transmitting apparatus comprising: a signal processing circuit that generates a plurality of control signals generated by performing a cyclic shift diversity method, and a plurality of data streams generated by performing a first signal processing and a second signal processing; and a transmitter that transmits the plurality of control signals and the plurality of data streams via multiple antennas in a single-carrier mode; wherein, in the first signal processing, phase changes are performed on a plurality of data symbols of each data stream according to a periodically changing first phase change value; and in the second signal processing, phase changes are performed on the plurality of data streams according to a plurality of second phase change values ​​provided to each data stream.

[0011] One embodiment of this application relates to a transmission method executed by a transmission device, comprising the following steps: generating multiple control signals by performing a cyclic shift diversity method, and generating multiple data streams by performing a first signal processing and a second signal processing; and transmitting the multiple control signals and the multiple data streams via multiple antennas in a single-carrier mode; in the first signal processing, performing phase changes on multiple data symbols of each data stream according to a periodically changing first phase change value; and in the second signal processing, performing phase changes on the multiple data streams according to a certain number of second phase change values ​​provided to each data stream.

[0012] These generalized and specific forms can be realized through any combination of systems, devices, and methods.

[0013] Thus, by means of this application, the reception quality of data in propagation environments including LOS can be improved, thereby enabling the provision of high-quality communication services.

[0014] The advantages and effects of one embodiment of this application can be seen from the specification and drawings. The advantages and / or effects involved are provided by several embodiments and features described in the specification and drawings, but not all of them need to be provided in order to obtain one or more of the same features. Attached Figure Description

[0015] Figure 1 An example configuration of the transmitting device in this embodiment is shown.

[0016] Figure 2 It shows Figure 1 An example of the configuration of a signal processing unit.

[0017] Figure 3 It shows Figure 1 An example of the structure of the wireless unit.

[0018] Figure 4 It shows Figure 1 An example of the composition of a frame of the transmitted signal.

[0019] Figure 5 It shows Figure 1 An example of the composition of a frame of the transmitted signal.

[0020] Figure 6 Showing relevant Figure 2 One example of the components that generate control information.

[0021] Figure 7 It shows Figure 1 An example of the configuration of the antenna section.

[0022] Figure 8 An example configuration of the receiving device in this embodiment is shown.

[0023] Figure 9 The relationship between the transmitting device and the receiving device is shown.

[0024] Figure 10 It shows Figure 8 An example of the configuration of the antenna section.

[0025] Figure 11 It shows Figure 5 Part of a frame.

[0026] Figure 12 It shows Figure 1 An example of the modulation method used by the mapping section.

[0027] Figure 13 It shows Figure 1 An example of a frame of the transmitted signal.

[0028] Figure 14 It shows Figure 1 An example of a frame of the transmitted signal.

[0029] Figure 15 An example configuration using a CCD is shown.

[0030] Figure 16 An example configuration of a carrier using OFDM is shown.

[0031] Figure 17 An example configuration of a transmission device based on the DVB-NGH standard is shown.

[0032] Figure 18 It shows Figure 1 An example of the configuration of a signal processing unit.

[0033] Figure 19 It shows Figure 1 An example of the configuration of a signal processing unit.

[0034] Figure 20 It shows Figure 1 An example of the configuration of a signal processing unit.

[0035] Figure 21 It shows Figure 1 An example of the configuration of a signal processing unit.

[0036] Figure 22 It shows Figure 1 An example of the configuration of a signal processing unit.

[0037] Figure 23 An example of a base station configuration is shown.

[0038] Figure 24 An example of a terminal configuration is shown.

[0039] Figure 25 An example of the frame structure of a modulated signal is shown.

[0040] Figure 26 An example of communication between a base station and a terminal is shown.

[0041] Figure 27 An example of communication between a base station and a terminal is shown.

[0042] Figure 28 It shows Figure 1 An example of the configuration of a signal processing unit.

[0043] Figure 29 It shows Figure 1 An example of the configuration of a signal processing unit.

[0044] Figure 30 It shows Figure 1 An example of the configuration of a signal processing unit.

[0045] Figure 31 It shows Figure 1 An example of the configuration of a signal processing unit.

[0046] Figure 32 It shows Figure 1 An example of the configuration of a signal processing unit.

[0047] Figure 33 It shows Figure 1 An example of the configuration of a signal processing unit.

[0048] Figure 34 An example of a system configuration in which a base station communicates with a terminal is shown.

[0049] Figure 35 An example of communication between a base station and a terminal is shown.

[0050] Figure 36 An example of the data contained in the receive capability notification symbol is shown.

[0051] Figure 37 An example of the data contained in the receive capability notification symbol is shown.

[0052] Figure 38 An example of the data contained in the receive capability notification symbol is shown.

[0053] Figure 39 An example of the frame structure for transmitting signals is shown.

[0054] Figure 40 An example of the frame structure for transmitting signals is shown.

[0055] Figure 41 An example of the configuration of a receiving device is shown.

[0056] Figure 42 An example of a frame structure using a multi-carrier transmission method is shown.

[0057] Figure 43 An example of a frame structure using a single-carrier transmission method is shown.

[0058] Figure 44 An example of the configuration of the transmitting device is shown.

[0059] Figure 45 An example of a symbol configuration method for the time axis is shown.

[0060] Figure 46 An example of a symbol configuration method for the frequency axis is shown.

[0061] Figure 47 An example of a symbol configuration method for the time and frequency axes is shown.

[0062] Figure 48 An example of a symbol configuration method for the time axis is shown.

[0063] Figure 49 An example of a symbol configuration method for the frequency axis is shown.

[0064] Figure 50 An example of a symbol configuration method for the time and frequency axes is shown.

[0065] Figure 51 An example of the composition of a modulated signal is shown.

[0066] Figure 52 An example of the frame structure during the transmission of a modulated signal is shown.

[0067] Figure 53 An example of the frame structure during the transmission of a modulated signal is shown.

[0068] Figure 54 An example of the configuration of the signal processing unit in the transmitting device is shown.

[0069] Figure 55 An example of the configuration of the wireless unit in a transmitting device is shown.

[0070] Figure 56 An example of the configuration of the signal processing unit in the transmitting device is shown.

[0071] Figure 57 An example of the composition of a modulated signal is shown.

[0072] Figure 58 An example of the frame structure during the transmission of a modulated signal is shown.

[0073] Figure 59 An example is shown where a phase-changing unit is configured before and after the weighted synthesis unit.

[0074] Figure 60 An example is shown where a phase-changing unit is configured before and after the weighted synthesis unit.

[0075] Figure 61 An example is shown where a phase-changing unit is configured before and after the weighted synthesis unit.

[0076] Figure 62 An example is shown where a phase-changing unit is configured before and after the weighted synthesis unit.

[0077] Figure 63 An example is shown where a phase-changing unit is configured before and after the weighted synthesis unit.

[0078] Figure 64 An example is shown where a phase-changing unit is configured before and after the weighted synthesis unit.

[0079] Figure 65 An example is shown where a phase-changing unit is configured before and after the weighted synthesis unit.

[0080] Figure 66 An example is shown where a phase-changing unit is configured before and after the weighted synthesis unit.

[0081] Figure 67 An example is shown where a phase-changing unit is configured before and after the weighted synthesis unit.

[0082] Figure 68 This is a diagram used to illustrate the operation of the mapping section.

[0083] Figure 69 An example of signal point configuration in a map is shown.

[0084] Figure 70 An example of signal point configuration in a map is shown.

[0085] Figure 71 An example of signal point configuration in a map is shown.

[0086] Figure 72 An example of signal point configuration in a map is shown.

[0087] Figure 73 An example of the configuration of the transmitting device is shown.

[0088] Figure 74 The operation of the mapping section is shown.

[0089] Figure 75 The operation of the mapping section is shown.

[0090] Figure 76 The operation of the mapping section is shown.

[0091] Figure 77 The operation of the mapping section is shown.

[0092] Figure 78 The operation of the mapping section is shown. Detailed Implementation

[0093] (Communication methods in a LOS environment)

[0094] In a LOS environment dominated by direct waves, non-patent document 1 describes a method that employs multiple antennas, such as a communication method called MIMO, as a transmission method to obtain good reception quality.

[0095] Figure 17 An example of a transmission apparatus based on the DVB-NGH (Digital Video Broadcasting-Next Generation Handheld) standard, as described in Non-Patent Document 1, is shown, with two transmit antennas and two transmit modulated signals (transmit streams). In the transmission apparatus, data 003 encoded by the encoding unit 002 is divided into data 005A and data 005B by the distribution unit 004. Data 005A undergoes optical cross-wavelength division multiplexing processing by the optical cross-wavelength division multiplexer 004A and mapping processing by the mapping unit 006A. Similarly, data 005B undergoes optical cross-wavelength division multiplexing processing by the optical cross-wavelength division multiplexer 004B and mapping processing by the mapping unit 006B. Weighted synthesis units 008A and 008B take the mapped signals 007A and 007B as inputs and perform weighted synthesis respectively to generate weighted synthesized signals 009A and 016B. The weighted synthesized signal 016B is then subjected to phase transformation. Furthermore, the wireless units 010A and 010B perform processes related to OFDM (orthogonal frequency division multiplexing), such as frequency conversion and amplification. The transmitted signal 011A is transmitted by the antenna 012A, and the transmitted signal 011B is transmitted by the antenna 012B.

[0096] In the past configurations, the transmission of single-stream signals was not considered. In such cases, it is particularly desirable to consider introducing new transmission methods to improve the reception quality of single-stream data in the receiving device.

[0097] Hereinafter, embodiments of this application will be described in detail with reference to the accompanying drawings.

[0098] (Implementation Method 1)

[0099] The transmitting method, transmitting device, receiving method, and receiving device of this embodiment will be described in detail.

[0100] Figure 1An example of the configuration of a transmitting device such as a base station, access point, or broadcasting station in this embodiment is shown. The error correction coding unit 102 takes data 101 and control signal 100 as input, performs error correction coding based on information related to the error correction code contained in the control signal 100 (e.g., error correction code information, code length (block length), coding rate), and outputs coded data 103. Furthermore, the error correction coding unit 102 may include an optical cross-wavelength division multiplexer; if an optical cross-wavelength division multiplexer is included, the data can be rearranged after coding, and the coded data 103 can be output.

[0101] The mapping unit 104 takes the encoded data 103 and the control signal 100 as inputs, performs mapping corresponding to the modulation method based on the modulation signal information contained in the control signal 100, and outputs baseband signal 105_1 and baseband signal 105_2 as the mapped signal. Furthermore, the mapping unit 104 generates the mapped signal 105_1 using a first series and the mapped signal 105_2 using a second series. Here, the first series and the second series are different.

[0102] The signal processing unit 106 takes the mapped signals 105_1 and 105_2, signal group 110, and control signal 100 as inputs, performs signal processing according to control signal 100, and outputs processed signals 106_A and 106_B. At this time, processed signal 106_A is represented as u1(i), and processed signal 106_B is represented as u2(i). i is the symbol number, for example, i is an integer greater than or equal to 0. Furthermore, regarding signal processing, [the following is used]... Figure 2 This will be explained later.

[0103] The wireless unit 107_A takes the processed signal 106_A and the control signal 100 as inputs, processes the processed signal 106_A according to the control signal 100, and outputs the transmission signal 108_A. Furthermore, the transmission signal 108_A is output as a radio wave from the antenna unit #A 109_A.

[0104] Similarly, the wireless unit 107_B takes the processed signal 106_B and the control signal 100 as inputs, processes the processed signal 106_B according to the control signal 100, and outputs the transmission signal 108_B. Furthermore, the transmission signal 108_B is output as a radio wave from the antenna unit #B 109_B.

[0105] The antenna unit #A 109_A takes the control signal 100 as input. At this time, the transmit signal 108_A is processed according to the control signal 100 and output as a radio wave. However, the antenna unit #A 109_A may also not take the control signal 100 as input.

[0106] Similarly, antenna unit #B 109_B takes control signal 100 as input. At this time, based on control signal 100, the transmitted signal 108_B is processed, and radio waves are output. However, antenna unit #B 109_B may also choose not to take control signal 100 as input.

[0107] In addition, control signal 100 can also be used as... Figure 1 The information sent by the communication object's device is generated. Figure 1 The device may have an input section, and the data is generated based on information input from the input section.

[0108] Figure 2 It shows Figure 1 An example of the configuration of the signal processing unit 106. The weighted synthesis unit (precoding unit) 203 processes the mapped signal 201A ( Figure 1 The mapped signal 105_1), the mapped signal 201B ( Figure 1 The mapped signal 105_2), and the control signal 200 ( Figure 1 Taking control signal 100 as input, the signal is weighted and synthesized (pre-encoded) according to control signal 200, outputting weighted signals 204A and 204B. At this point, the mapped signal 201A is represented as s1(t), the mapped signal 201B as s2(t), the weighted signal 204A as z1(t), and the weighted signal 204B as z2'(t). Additionally, t, as an example, represents time. s1(t), s2(t), z1(t), and z2'(t) are defined by complex numbers. Therefore, they can also be real numbers.

[0109] The weighted synthesis unit (precoding unit) 203 performs the following calculations.

[0110] [Formula 1]

[0111]

[0112] In equation (1), a, b, c, and d are defined by complex numbers. Additionally, a, b, c, and d can also be real numbers. Furthermore, i is the symbol number.

[0113] Furthermore, the phase-changing unit 205B takes the weighted synthesized signal 204B and the control signal 200 as inputs, performs a phase change on the weighted synthesized signal 204B according to the control signal 200, and outputs the phase-changed signal 206B. The phase-changed signal 206B is represented by z2(t), where z2(t) is defined by a complex number. Alternatively, z2(t) can also be a real number.

[0114] The specific operation of the phase-changing unit 205B will be explained. In the phase-changing unit 205B, for example, a phase change of y(i) is performed for z2'(i). Therefore, it can be expressed as z2(i) = y(i) × z2'(i). i is the symbol number, and i is an integer greater than or equal to 0.

[0115] For example, the phase change value can be set as follows: N is an integer greater than or equal to 2, and N is the period of the phase change. Setting N to an odd number greater than or equal to 3 may improve the data reception quality.

[0116] [Formula 2]

[0117]

[0118] j is the imaginary unit. However, equation (2) is only an example and is not limited to it. Therefore, the phase change value y(i) = e j×δ(i) To express.

[0119] At this point, z1(i) and z2(i) can be represented by the following formula.

[0120] [Formula 3]

[0121]

[0122] Furthermore, δ(i) is a real number. Also, z1(i) and z2(i) are transmitted by the transmitting device at the same time and at the same frequency (same frequency band).

[0123] In equation (3), the value of the phase change is not limited to equation (2). For example, a periodic or regular method of changing the phase can be considered.

[0124] Set the matrix (precoding matrix) in equations (1) and (3) as equation 4.

[0125] [Formula 4]

[0126]

[0127] For example, one could consider that matrix F could be any of the following matrices.

[0128] [Formula 5]

[0129]

[0130] [Formula 6]

[0131]

[0132] [Formula 7]

[0133]

[0134] [Formula 8]

[0135]

[0136] [Formula 9]

[0137]

[0138] [Formula 10]

[0139]

[0140] [Formula 11]

[0141]

[0142] [Formula 12]

[0143]

[0144] Furthermore, in equations (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). And β is also not 0 (zero).

[0145] [Formula 13]

[0146]

[0147] [Formula 14]

[0148]

[0149] [Formula 15]

[0150]

[0151] [Formula 16]

[0152]

[0153] [Formula 17]

[0154]

[0155] [Formula 18]

[0156]

[0157] [Formula 19]

[0158]

[0159] [Formula 20]

[0160]

[0161] Furthermore, in equations (13), (15), (17), and (19), β can be a real number or an imaginary number. However, β is not 0 (zero). (θ is a real number)

[0162] [Formula 21]

[0163]

[0164] [Formula 22]

[0165]

[0166] [Formula 23]

[0167]

[0168] [Formula 24]

[0169]

[0170] [Formula 25]

[0171]

[0172] [Formula 26]

[0173]

[0174] [Formula 27]

[0175]

[0176] [Formula 28]

[0177]

[0178] [Formula 29]

[0179]

[0180] [Formula 30]

[0181]

[0182] [Formula 31]

[0183]

[0184] [Formula 32]

[0185]

[0186] However, θ 11 (i), θ 21 λ(i) and λ(i) are functions of symbol number i, and are real numbers. λ may be a fixed value, a real number, or it may not be a fixed value. α can be a real number or an imaginary number. β can be a real number or an imaginary number. However, α is not 0 (zero). Furthermore, β is also not 0 (zero). And θ 11 θ 21 It is a real number.

[0187] Furthermore, in addition to the above, various embodiments of this application can be performed even using any of the precoding matrices shown below.

[0188] [Formula 33]

[0189]

[0190] [Formula 34]

[0191]

[0192] [Formula 35]

[0193]

[0194] [Formula 36]

[0195]

[0196] In addition, β in equations (34) and (36) can be a real number or an imaginary number. However, β is not 0 (zero).

[0197] The insertion unit 207A takes the weighted synthesized signal 204A, the pilot symbol signal pa(t) 251A in time t, the preamble signal 252, the control information symbol signal 253, and the control signal 200 as inputs, and outputs the baseband signal 208A based on the frame composition information contained in the control signal 200.

[0198] Similarly, the insertion unit 207B takes the phase-changed signal 206B, the pilot symbol signal pb(t) 251B in time t, the preamble signal 252, the control information symbol signal 253, and the control signal 200 as inputs, and outputs the baseband signal 208B based on the frame composition information contained in the control signal 200.

[0199] The phase-changing unit 209B takes the baseband signal 208B and the control signal 200 as inputs. It performs phase-changing on the baseband signal 208B according to the control signal 200 and outputs the phase-changed signal 210B. The baseband signal 208B is used as a function of symbol number i, represented as x'(i). Thus, the phase-changed signal x(i)210B can be represented by x(i) = ej × ε(i) × x'(i). Here, i is an integer greater than or equal to 0, and j is the imaginary unit.

[0200] Furthermore, as will be explained later, the operation of the phase-changing unit 209B can be either CDD (Cyclic Delay Diversity) or CSD (Cyclic Shift Diversity) as described in Non-Patent Documents 2 and 3. Hereinafter referred to as CDD / CSD. Moreover, the phase-changing unit 209B performs phase changes on symbols existing in the frequency axis direction. That is, the phase-changing unit 209B performs phase changes on data symbols, pilot symbols, control information symbols, etc.

[0201] Figure 3 It shows Figure 1 This is an example of the configuration of the wireless units 107_A and 107_B. The serial-to-parallel conversion unit 302 converts the signal 301 and the control signal 300 ( Figure 1 The control signal 100 is used as input, and the serial-to-parallel conversion is performed according to the control signal 300, and the converted signal 303 is output.

[0202] The inverse Fourier transform 304 takes the serial-to-parallel converted signal 303 and the control signal 300 as inputs, performs an inverse Fourier transform based on the control signal 300, for example, performs an inverse fast Fourier transform (IFFT), and outputs the Fourier transformed signal 305.

[0203] The processing unit 306 takes the Fourier transform signal 305 and the control signal 300 as inputs, performs frequency conversion, amplification and other processing according to the control signal 300, and outputs the modulation signal 307.

[0204] For example, when using signal 301 as Figure 1 In the case of signal 106_A after signal processing, the modulation signal 307 is equivalent to Figure 1 The transmitted signal is 108_A. Furthermore, signal 301 is used as... Figure 1 In the case of signal 106_B after signal processing, the modulated signal 307 is equivalent to Figure 1 The transmitted signal is 108_B.

[0205] Figure 4 It shows Figure 1 The frame structure consists of the transmitted signal 108_A. Figure 4 In the diagram, the horizontal axis represents frequency (carrier), and the vertical axis represents time. Because multi-carrier transmission methods such as OFDM are used, the symbols exist in the carrier direction. Furthermore, in... Figure 4 The code elements of all the carriers are shown. Furthermore, in Figure 4 The symbols from time $1 to time $11 are shown.

[0206] exist Figure 4 Pilot symbol 401 is shown. Figure 2 The pilot symbol signal 251A), data symbol 402, and other symbols 403. Here, the pilot symbol is, for example, a PSK (Phase Shift Keying) symbol, used by the receiving device receiving this frame to perform channel estimation (estimation of transport path variation), frequency offset, and phase variation estimation. Figure 1 Transmitting device and receiving device Figure 4 The receiving device of the frame can share the method of transmitting pilot symbols.

[0207] Here, the mapped signal 201A ( Figure 1 The mapped signal 105_1 is named "stream #1", and the mapped signal 201B is named "stream #1". Figure 1 The mapped signal 105_2 is named "Stream #2". The same applies to this later explanation.

[0208] Data symbol 402 is equivalent to... Figure 2 The signal processing generates baseband signal 208A symbols. Therefore, data symbol 402 is either (including symbols from both "stream #1" and "stream #2") or either "stream #1" or "stream #2", which will be determined by the composition of the precoding matrix used by the weighted synthesis unit 203.

[0209] The other code 403 is equivalent to Figure 2 The symbols in the preamble signal 242 and control information symbol signal 253 are used. However, other symbols may include symbols other than the preamble signal and control information symbols. In this case, the preamble signal can transmit (control) data and is composed of symbols for signal detection, symbols for frequency synchronization and time synchronization, symbols for channel estimation (symbols for estimating transport path changes), etc. Furthermore, the control information symbols include those received by the receiver. Figure 4 The frame receiving device demodulates the data symbols and decodes the control information symbols.

[0210] For example, Figure 4All carriers from time $1 to time 4 become other code elements 403.

[0211] and,

[0212] At time $5,

[0213] Carriers 1 to 11 become data symbol 402. After this,

[0214] Carrier 12 becomes pilot symbol 401.

[0215] Carriers 13 to 23 become data code element 402.

[0216] Carrier 24 becomes pilot symbol 401; further details are omitted here.

[0217] At time $6,

[0218] Carrier 1 and carrier 2 become data symbol 402.

[0219] Carrier 3 becomes pilot symbol 401, and subsequent details are omitted.

[0220] • The records from time $7 to time $10 are omitted.

[0221] At time $11,

[0222] Descriptions of carriers 1 to 29 are omitted.

[0223] At time $11, carrier 30 becomes pilot symbol 401.

[0224] At time $11, carriers 31 to 36 become data code 402.

[0225] Figure 5 It shows Figure 1 The frame structure consists of the transmitted signal 108_B. Figure 5 In the diagram, the horizontal axis represents frequency (carrier), and the vertical axis represents time. Due to the use of multi-carrier transmission methods such as OFDM, the symbols exist in the carrier direction. Furthermore, in... Figure 5 The code elements of all the carriers are shown. Furthermore, in Figure 5 The symbols from time $1 to time $11 are shown.

[0226] exist Figure 5 Pilot symbol 501 is shown. Figure 2 The pilot signal 251B), data symbols 502, and other symbols 503. Here, the pilot symbols are, for example, PSK symbols, used by the receiving device to perform channel estimation (estimation of transport path variation), frequency offset, and phase variation estimation. Figure 1 Transmitting device and receiving device Figure 5The receiving device of the frame can share the method of transmitting pilot symbols.

[0227] Data symbol 502 is equivalent to... Figure 2 The baseband signal 208B is generated by signal processing. Therefore, the data symbol 502 is any one of the symbols of both "stream #1" and "stream #2", or "stream #1" or "stream #2", which will be determined by the composition of the precoding matrix used by the weighted synthesis unit 203.

[0228] The other code 503 is equivalent to Figure 2 The code includes the preamble signal 252 and the control information code signal 253. However, other code elements may also include code elements other than the pilot signal and control information code elements. In this case, the preamble can transmit data (e.g., control data) and is composed of code elements for signal detection, code elements for frequency and time synchronization, and code elements for channel estimation. Furthermore, the control information code elements include those for receiving... Figure 5 The frame receiving device demodulates the data symbols and decodes the control information symbols.

[0229] For example, in Figure 5 middle,

[0230] • Between time $1 and time $4,

[0231] All carriers become other code elements 403.

[0232] At time $5,

[0233] Carriers 1 to 11 become data code 402.

[0234] Carrier 12 becomes pilot symbol 401.

[0235] Carriers 13 to 23 become data code element 402.

[0236] Carrier 24 becomes pilot symbol 401, and the record of the carrier in subsequent time $5 is omitted.

[0237] At time $6,

[0238] Carrier 1 and carrier 2 become data symbol 402.

[0239] Carrier 3 becomes pilot symbol 401, and the record of the carrier in subsequent time $6 is omitted.

[0240] • The records for times $7 to $10 are omitted.

[0241] At time $11,

[0242] Descriptions of carriers 1 to 29 are omitted.

[0243] Carrier 30 becomes pilot symbol 401.

[0244] Carriers 31 to 36 become data code element 402.

[0245] exist Figure 4 The carrier A and time B contain code elements. Figure 5 When carrier A and time B contain code elements, Figure 4 The code elements of carrier A and time B are Figure 5 The symbols of carrier A and time B are transmitted at the same time and frequency. Furthermore, regarding frame composition, it is not affected by... Figure 4 and Figure 5 limited, Figure 4 and Figure 5 This is just an example of what a frame is made of.

[0246] and, Figure 4 and Figure 5 The other code elements in the text are equivalent to " Figure 2 The code elements of "preamble signal 252" and "control information code element signal 253" are therefore, in conjunction with... Figure 4 The other code elements 403 are from the same time and at the same frequency (same carrier). Figure 5 In the case of other code elements 503 transmitting control information, the same data (the same control information) is transmitted.

[0247] In addition, although it was conceived Figure 4 frames and Figure 5 The frames are received simultaneously by the receiving device, even if the receiving device receives Figure 4 frames or Figure 5 The receiving device can also receive the data sent from the transmitting device in the frame.

[0248] Figure 6 It shows the method used to generate Figure 2 This is an example of the composition of the control information generation related part of the control information symbol signal 253.

[0249] The control information mapping unit 602 takes data 601 related to control information and control signal 600 as input, and maps the data 601 related to control information using a modulation method based on control signal 600, outputting a mapped signal 603 for control information. Furthermore, the mapped signal 603 for control information is equivalent to... Figure 2 The control information symbol signal 253.

[0250] Figure 7 It shows Figure 1An example of the configuration of antenna section #A 109_A and antenna section #B 109_B is shown. An example of antenna section #A 109_A and antenna section #B 109_B being composed of multiple antennas is shown.

[0251] The distribution unit 702 takes the transmission signal 701 as input, distributes it, and outputs transmission signals 703_1, 703_2, 703_3, and 703_4.

[0252] The multiplication unit 704_1 takes the transmission signal 703_1 and the control signal 700 as inputs, and multiplies the transmission signal 703_1 with the multiplication coefficients according to the information of the multiplication coefficients contained in the control signal 700, and outputs the multiplied signal 705_1. The multiplied signal 705_1 is output as a radio wave from the antenna 706_1.

[0253] When the transmitted signal 703_1 is set as Tx1(t) and the multiplication coefficient is set as W1, the multiplied signal 705_1 is represented as Tx1(t)×W1. t represents time, and W1 can be defined by a complex number, so it can also be a real number.

[0254] The multiplication unit 704_2 takes the transmission signal 703_2 and the control signal 700 as inputs, and multiplies the transmission signal 703_2 with the multiplication coefficients according to the information of the multiplication coefficients contained in the control signal 700, and outputs the multiplied signal 705_2. The multiplied signal 705_2 is output as a radio wave from the antenna 706_2.

[0255] If we define the transmitted signal 703_2 as Tx2(t) and the multiplication coefficient as W2, the multiplied signal 705_2 is then expressed as Tx2(t)×W2. t represents time, and W2 can be defined by a complex number, so it can also be a real number.

[0256] The multiplication unit 704_3 takes the transmission signal 703_3 and the control signal 700 as inputs, and multiplies the transmission signal 703_3 with the multiplication coefficients according to the information of the multiplication coefficients contained in the control signal 700, and outputs the multiplied signal 705_3. The multiplied signal 705_3 is output as a radio wave from the antenna 706_3.

[0257] If the transmitted signal 703_3 is set as Tx3(t) and the multiplication coefficient is set as W3, the multiplied signal 705_3 is represented as Tx3(t)×W3. W3 can be defined by a complex number, and therefore can also be a real number.

[0258] The multiplication unit 704_4 takes the transmission signal 703_4 and the control signal 700 as inputs, and multiplies the transmission signal 703_4 with the multiplication coefficients according to the information of the multiplication coefficients contained in the control signal 700, and outputs the multiplied signal 705_4. The multiplied signal 705_4 is output as a radio wave from the antenna 706_4.

[0259] When the transmitted signal 703_4 is set as Tx4(t) and the multiplication coefficient is set as W4, the multiplied signal 705_4 is represented as Tx4(t)×W4. W4 can be defined as a complex number, and therefore can also be a real number.

[0260] Alternatively, it can also be that "the absolute values ​​of W1, W2, W3, and W4 are equal." In this case, it is equivalent to a phase shift. Of course, the absolute values ​​of W1, W2, W3, and W4 can also be unequal.

[0261] Furthermore, in Figure 7 The example given is an antenna section consisting of four antennas. However, the number of antennas is not limited to four; it can consist of two or more antennas. Alternatively, the antenna section can also consist of four antennas and four multiplication units.

[0262] Furthermore, in Figure 1 The antenna section #A 109_A is configured as follows: Figure 7 As shown, transmitting signal 701 is equivalent to Figure 1 The transmitted signal is 108_A. Furthermore, in Figure 1 The antenna section #B 109_B is configured as follows: Figure 7 As shown, transmitting signal 701 is equivalent to Figure 1 The transmitted signal 108_B is equivalent to Figure 1 The transmitted signal is 108_B. However, antenna section #A 109_A and antenna section #B 109_B may not be... Figure 7 As shown in the configuration above, the antenna section may not require the control signal 100 as an input.

[0263] Figure 8 It is shown that, in Figure 1 The transmitting device, for example, transmits Figure 4 and Figure 5 An example of a receiving device that receives a modulated signal when the transmitted signal is composed of frames.

[0264] The wireless unit 803X takes the received signal 802X received by the antenna unit #X 801X as input, performs frequency conversion, Fourier transform and other processing, and outputs the baseband signal 804X.

[0265] Similarly, the wireless unit 803Y takes the received signal 802Y received by the antenna unit #Y 801Y as input, performs frequency conversion, Fourier transform and other processing, and outputs the baseband signal 804Y.

[0266] Furthermore, although the antenna section #X 801X and antenna section #Y 801Y are configured to take the control signal 810 as input, Figure 8 As shown, it can also be configured without the control signal 810 as an input. The operation when the control signal 810 is present as an input will be explained in detail later.

[0267] Here, Figure 9 The relationship between the transmitting device and the receiving device is shown. Figure 9 Antennas 901_1 and 901_2 are transmitting antennas. Figure 9 The antenna 901_1 is equivalent to Figure 1 The antenna section #A 109_A. Furthermore, Figure 9 The antenna 901_2 is equivalent to Figure 1 The antenna section #B 109_B.

[0268] and, Figure 9 Antennas 902_1 and 902_2 are receiving antennas. Figure 9 The antenna 902_1 is equivalent to Figure 8 The antenna section #X801X. Furthermore, Figure 9 The antenna 902_2 is equivalent to Figure 8 The antenna section #Y801Y.

[0269] like Figure 9 As shown, the signal transmitted from transmitting antenna 901_1 is designated as u1(i), the signal transmitted from transmitting antenna 901_2 is designated as u2(i), the signal received from receiving antenna 902_1 is designated as r1(i), and the signal received from receiving antenna 902_2 is designated as r2(i). Additionally, i represents the symbol number, which is, for example, an integer greater than or equal to 0.

[0270] Furthermore, let h11(i) be the propagation coefficient from transmitting antenna 901_1 to receiving antenna 902_1, h21(i) be the propagation coefficient from transmitting antenna 901_1 to receiving antenna 902_2, h12(i) be the propagation coefficient from transmitting antenna 901_2 to receiving antenna 902_1, and h22(i) be the propagation coefficient from transmitting antenna 901_2 to receiving antenna 902_2. Thus, the following relationship holds.

[0271] [Formula 37]

[0272]

[0273] In addition, n1(i) and n2(i) are noise.

[0274] Figure 8 The channel estimation unit 805_1 of the modulation signal u1 takes the baseband signal 804X as input and utilizes... Figure 4 , Figure 5 The preamble and / or pilot symbols in the code are used to perform channel estimation of the modulated signal u1, that is, to perform h11(i) estimation of equation (37) and output the channel estimation signal 806_1.

[0275] The channel estimation unit 805_2 of the modulated signal u2 takes the baseband signal 804X as input and utilizes... Figure 4 , Figure 5 The preamble and / or pilot symbols in the modulated signal u2 are used to estimate the channel of the modulated signal u2, that is, to estimate h12(i) of equation (37) and output the channel estimation signal 806_2.

[0276] The channel estimation unit 807_1 of the modulated signal u1 takes the baseband signal 804Y as input and utilizes... Figure 4 , Figure 5 The preamble and / or pilot symbols in the modulated signal u1 are used to estimate the channel of the modulated signal u1, and the h21(i) of equation (37) is estimated to output the channel estimation signal 808_1.

[0277] The channel estimation unit 807_2 of the modulated signal u2 takes the baseband signal 804Y as input and utilizes... Figure 4 , Figure 5 The preamble and / or pilot symbols in the modulated signal u2 are used to estimate the channel of the modulated signal u2, that is, to estimate h22(i) of equation (37) and output the channel estimation signal 808_2.

[0278] The control information decoding unit 809 takes the baseband signals 804X and 804Y as input and performs... Figure 4 , Figure 5 The demodulation and decoding of control information contained in the "other code elements" outputs a control signal 810 containing control information.

[0279] The signal processing unit 811 takes the channel estimation signals 806_1, 806_2, 808_1, 808_2, baseband signals 804X, 804Y, and control signal 810 as inputs, uses the relationship of equation (37), and demodulates and decodes the control information (e.g., information on modulation mode and error correction code association) in the control signal 810, and outputs the received data 812.

[0280] Additionally, control signal 810 may not be... Figure 8 The signal generated by the method shown. For example, Figure 8The control signal 810 can be used as Figure 8 The other party in the communication ( Figure 1 The device generates a signal based on the information sent. Figure 8 The device has an input section, so that information can be generated based on information input from the input section.

[0281] Figure 10 It shows Figure 8 An example of the configuration of antenna section #X 801X and antenna section #Y 801Y is shown. An example of antenna section #X 801X and antenna section #Y 801Y being composed of multiple antennas is shown.

[0282] The multiplication unit 1003_1 takes the received signal 1002_1 and the control signal 1000 received by the antenna 1001_1 as inputs, and multiplies the received signal 1002_1 with the multiplication coefficients according to the information of the multiplication coefficients contained in the control signal 1000, and outputs the multiplied signal 1004_1.

[0283] When the received signal 1002_1 is set as Rx1(t) and the multiplication coefficient is set as D1, the multiplied signal 1004_1 is represented as Rx1(t)×D1. t represents time, and D1 can be defined by a complex number, so it can also be a real number.

[0284] The multiplication unit 1003_2 takes the received signal 1002_2 and the control signal 1000 received by the antenna 1001_2 as inputs, and multiplies the received signal 1002_2 with the multiplication coefficients according to the information of the multiplication coefficients contained in the control signal 1000, and outputs the multiplied signal 1004_2.

[0285] When the received signal 1002_2 is set as Rx2(t) and the multiplication coefficient is set as D2, the multiplied signal 1004_2 is represented as Rx2(t)×D2. D2 can be defined by a complex number, so it can also be a real number.

[0286] The multiplication unit 1003_3 takes the received signal 1002_3 and the control signal 1000 received by the antenna 1001_3 as inputs, and multiplies the received signal 1002_3 with the multiplication coefficients according to the information of the multiplication coefficients contained in the control signal 1000, and outputs the multiplied signal 1004_3.

[0287] When the received signal 1002_3 is set as Rx3(t) and the multiplication coefficient is set as D3, the multiplied signal 1004_3 is represented as Rx3(t)×D3. D3 can be defined by a complex number, and therefore can also be a real number.

[0288] The multiplication unit 1003_4 takes the received signal 1002_4 and the control signal 1000 received by the antenna 1001_4 as inputs, and multiplies the received signal 1002_4 with the multiplication coefficients according to the information of the multiplication coefficients contained in the control signal 1000, and outputs the multiplied signal 1004_4.

[0289] When the received signal 1002_4 is set as Rx4(t) and the multiplication coefficient is set as D4, the multiplied signal 1004_4 is represented as Rx4(t)×D4. D4 can be defined by a complex number, and therefore can also be a real number.

[0290] The synthesis unit 1005 takes the multiplied signals 1004_1, 1004_2, 1004_3, and 1004_4 as input, synthesizes them, and outputs the synthesized signal 1006. Furthermore, the synthesized signal 1006 is represented as Rx1(t)×D1+Rx2(t)×D2+Rx3(t)×D3+Rx4(t)×D4.

[0291] exist Figure 10 Although the example given uses a configuration with four antennas, the number of antennas is not limited to four; it can be composed of two or more antennas. The antenna section can also consist of four antennas and four multiplication units.

[0292] Furthermore, in Figure 8 The antenna section of #X 801X is configured as follows: Figure 10 As shown, the received signal 802X is equivalent to Figure 10 The synthesized signal 1006 and the control signal 710 are equivalent to Figure 10 The control signal is 1000. Furthermore, in... Figure 8 The antenna section #Y 801Y is configured as follows: Figure 10 As shown, the received signal 802Y is equivalent to Figure 10 The synthesized signal 1006 and the control signal 710 are equivalent to Figure 10 The control signal is 1000. However, antenna section #X 801X and antenna section #Y 801Y may not be... Figure 10 With the configuration shown, the antenna section described above may not require the control signal 710 as an input.

[0293] Alternatively, the control signal 800 can also be a signal generated by the communication counterpart based on the information sent, and the device has an input section, which can also be a signal generated based on the information input from that input section.

[0294] then, Figure 1 The signal processing unit 106 of the transmitting device shown is as follows: Figure 2As shown, phase change unit 205B and phase change unit 209B are inserted. The features and effects at this time will be explained.

[0295] Such as using Figure 4 , Figure 5 As described above, precoding (weighted synthesis) is performed on the mapped signal s1(i)201A obtained by mapping using the first series and the mapped signal s2(i)201B obtained by mapping using the second series. A phase change is performed on one of the weighted synthesized signals 204A and 204B, and this phase change is performed by the phase change unit 205B. i is the symbol number, and i is an integer greater than or equal to 0.

[0296] Furthermore, the weighted combined signal 204A and the phase-changed signal 206B are transmitted at the same frequency and at the same time. Therefore, in Figure 4 , Figure 5 In China, targeting Figure 5 The data symbol 502 undergoes a phase change.

[0297] exist Figure 2 In this case, since the phase change unit 205B targets the weighted and synthesized signal 204B, therefore... Figure 5 The data symbol 502 undergoes a phase change. When performing a phase change on the weighted synthesized signal 204A, the phase change is performed on... Figure 4 The data symbol 402 undergoes a phase change. This will be explained later.

[0298] For example, Figure 11 Showing the target Figure 5 From the frames, carriers 1 to 5 and time intervals $4 to $6 were extracted. Additionally, in Figure 11 Zhongyu Figure 5 Similarly, pilot symbol 501, data symbol 502, and other symbols 503 are shown.

[0299] As mentioned above, in Figure 11 The code symbols shown are phase-modified by the phase-modification unit 205B for the data code symbols in (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6).

[0300] Therefore, in response to Figure 11 The data symbols shown are configured with the following phase change values.

[0301] In (carrier 1, time $5) is "e" j×δ15(i) "

[0302] At (carrier 2, time $5) is "e" j×δ25(i) "

[0303] At (carrier 3, time $5) is "e" j×δ35(i) "

[0304] At (carrier 4, time $5) is "e" j×δ45(i) "

[0305] In (carrier 5, time $5) is "e" j×δ55(i) "

[0306] In (carrier 1, time $6) is "e" j×δ16(i) "

[0307] At (carrier 2, time $6) is "e" j×δ26(i) "

[0308] At (carrier 4, time $6) is "e" j×δ46(i) "

[0309] At (carrier 5, time $6) is "e" j×δ56(i) ".

[0310] In addition, Figure 11 The other symbols shown in (carrier 1, time $4), (carrier 2, time $4), (carrier 3, time $4), (carrier 4, time $4), (carrier 5, time $4), and the pilot symbols in (carrier 3, time $6) are not the targets of phase change by the phase change unit 205B.

[0311] This is a characteristic of the phase change unit 205B. Additionally, in relation to... Figure 11 The data symbols in the phase-change objects (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are "the same carrier, the same time", such as Figure 4 Configure the data carrier as shown.

[0312] That is, in Figure 4 In the diagram, (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are data symbols.

[0313] That is, the data symbols used in MIMO transmission are the targets of phase changes by the phase change unit 205B. MIMO transmission means transmitting multiple streams.

[0314] Furthermore, as an example of the phase change unit 205B performing phase changes on data symbols, as shown in equation (2), a regular phase change is performed on the data symbols, for example, a phase change with a period of N. However, the method of performing phase changes on data symbols is not limited to this.

[0315] Thus, in environments dominated by direct sunlight, such as in a LOS environment, it is possible to improve the reception quality of data symbols transmitted via MIMO in the receiving device. This effect will be explained.

[0316] For example, Figure 1 The modulation scheme used by the mapping unit 104 is QPSK (Quadrature Phase Shift Keying). Figure 2 The mapped signal 201A is a QPSK signal, and the mapped signal 201B also becomes a QPSK signal. That is, two QPSK streams are transmitted. Thus, in Figure 8 The signal processing unit 811, for example, uses channel estimation signals 806_1 and 806_2 to obtain 16 candidate signal points. QPSK can transmit 2 bits; since there are two streams, a total of 4 bits are transmitted. Therefore, there are 2... 4 = 16 candidate signal points. In addition, another 16 candidate signal points can be obtained using channel estimation signals 808_1 and 808_2. Since the explanation is the same, the focus will be on the 16 candidate signal points obtained using channel estimation signals 806_1 and 806_2.

[0317] An example of this state is given by Figure 12 A, Figure 12 B is shown. Figure 12 A and Figure 12 B represents the horizontal axis as in-phase I and the vertical axis as orthogonal Q. In the in-phase I-orthogonal Q plane, there are 16 candidate signal points. Among these 16 candidate signal points, one is the signal point transmitted by the transmitting device. Therefore, it is called the "16 candidate signal points".

[0318] In environments dominated by direct sunlight, such as in a LOS environment, the first case can be considered as " Figure 2 In the case where the phase change unit 205B is absent, i.e., not by Figure 2 The phase change unit 205B performs phase change.

[0319] In the "first scenario," since no phase change occurs, it is possible to fall into... Figure 12 The state shown in A. Trapped in... Figure 12 In state A, as shown in "signal points 1201, 1202", "signal points 1203, 1204, 1205, 1206", and "signal points 1207, 1208", due to the existence of densely packed signal points (i.e., points that are close to each other), therefore... Figure 8 The receiving device may reduce the quality of data reception.

[0320] To overcome this phenomenon, Figure 2 In the middle, a phase transition unit 205B is inserted. When inserting the phase transition unit 205B, since the symbol number i, there exists... Figure 12 The symbol numbering of the densely packed signal points shown in A, and... Figure 12 The symbol numbers for "long distance between signal points" shown in B are mixed up. To address this situation, by introducing error-correcting codes, a high error-correction capability can be achieved. Figure 8 The receiving device is capable of achieving high data reception quality.

[0321] In addition, Figure 2 For pilot symbols and preambles, which are used for demodulation (detection) of data symbols and for channel estimation, in Figure 2 The phase-changing unit 205B does not perform phase changing. Therefore, in data symbols, "due to symbol number i, thus..." Figure 12 The symbol numbering of the densely packed signal points shown in A, and... Figure 12 The symbol numbering for “long distance between signal points” shown in B is mixed up.

[0322] However, regarding pilot symbols and preambles, which are used for demodulating (detecting) data symbols and for channel estimation, in Figure 2 Even if the phase-changing unit 205B performs a phase change, the following situation may occur: when the data symbol can achieve "due to symbol number i, therefore..." Figure 12 The symbol number of the "dense signal point area" shown in A, and... Figure 12 The symbol numbering for “long distance between signal points” shown in B is mixed up.

[0323] In this case, phase changes are performed by adding certain conditions to the pilot symbols and preamble. For example, it is possible to consider setting different rules than those for phase changes to data symbols, and to perform phase changes for "pilot symbols and / or preamble". As an example, there are methods for performing regular phase changes with a period of N for data symbols and regular phase changes with a period of M for pilot symbols and / or preamble. N and M are integers of 2 or higher.

[0324] As described above, the phase-changing unit 209B takes the baseband signal 208B and the control signal 200 as inputs, performs phase-changing on the baseband signal 208B based on the control signal 200, and outputs the phase-changed signal 210B. If the baseband signal 208B is set as a function of symbol number i, it is represented as x'(i). Thus, the phase-changed signal 210B(x(i)) can be expressed as x(i) = e j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[0325] Furthermore, the operation of the phase-changing unit 209B can also be the CDD / CSD described in Non-Patent Documents 2 and 3. Moreover, the phase-changing unit 209B is characterized by performing phase changes on symbols present in the frequency axis direction (performing phase changes on data symbols, pilot symbols, control information symbols, etc.).

[0326] Therefore, in this case, the code elements that become the object with code element number i are data code elements, pilot code elements, control information code elements, preamble (other code elements), etc.

[0327] Because in Figure 2 In this case, the phase change unit 209B performs phase change on the baseband signal 208B, therefore... Figure 5 The recorded symbols undergo phase changes. In the process of... Figure 2 When the baseband signal 208A undergoes phase change, for Figure 4 The recorded symbols undergo phase changes. This will be explained later.

[0328] Therefore, in Figure 5 In the frame, Figure 2 The phase-changing unit 209B performs phase changes on all symbols (other symbols 503) of all carriers at time $1.

[0329] same, Figure 2 The phase-changing unit 209B performs phase changes for the following symbols:

[0330] "All symbols of all carriers at time $2 (other symbols 503)"

[0331] "All symbols of all carriers at time $3 (other symbols 503)"

[0332] "All symbols of all carriers at time $4 (other symbols 503)"

[0333] "All symbols of all carriers at time $5 (pilot symbol 501 or data symbol 502)".

[0334] "All symbols of all carriers at time $6 (pilot symbol 501 or data symbol 502)".

[0335] "All symbols of all carriers at time $7 (pilot symbol 501 or data symbol 502)"

[0336] "All symbols of all carriers at time $8 (pilot symbol 501 or data symbol 502)"

[0337] "All symbols of all carriers at time $9 (pilot symbol 501 or data symbol 502)".

[0338] "All symbols of all carriers at time $10 (pilot symbol 501 or data symbol 502)"

[0339] "All symbols of all carriers at time $11 (pilot symbol 501 or data symbol 502)"

[0340] Furthermore, the details of the time and the medium are omitted.

[0341] Figure 13 It shows Figure 1 The transmitted signal 108_A and Figure 4 Different frames constitute the composition. Figure 13 In China, for the sake of Figure 4 The same job is assigned the same number. Figure 13 In the diagram, the horizontal axis represents frequency (carrier), and the vertical axis represents time. Figure 4 Similarly, due to the use of multi-carrier transmission methods such as OFDM, symbols exist in the carrier direction. Furthermore, in Figure 13 Zhongyu Figure 4 Similarly, the code elements of all the carriers are shown. And, in Figure 13 Zhongyu Figure 4 Similarly, the symbols for times $1 to $11 are shown.

[0342] exist Figure 13 In addition to pilot code element 401 ( Figure 2In addition to the pilot signal 251A, data code element 402, and other code elements 403, a null symbol 1301 is also inserted.

[0343] Regarding the null character 1301, the in-phase component I is zero (0), and the orthogonal component Q is zero (0). Furthermore, although it is referred to here as the "null character," it is not limited to this name.

[0344] Furthermore, in Figure 13 A null character will be inserted into carrier 19. Furthermore, the method of inserting the null character is not subject to... Figure 13 Due to limitations of the configuration shown, for example, a null character can be inserted at a specific time, or in a specific frequency domain and time domain. It can also be inserted continuously in the time domain and frequency domain, or discretely in the time domain and frequency domain.

[0345] Figure 14 It shows Figure 1 The transmitted signal 108_B and Figure 5 Different frames constitute the composition. Figure 14 For Figure 5 The same job is assigned the same number. Figure 14 In the diagram, the horizontal axis represents frequency (carrier), and the vertical axis represents time. Figure 5 Similarly, due to the use of multi-carrier transmission methods such as OFDM, symbols exist in the carrier direction. Furthermore, in Figure 14 and Figure 5 Similarly, the code elements of all the carriers are shown. And, in Figure 14 and Figure 5 Similarly, the symbols for times $1 to $11 are shown.

[0346] exist Figure 14 In addition to pilot symbol 501, Figure 2 In addition to the pilot signal 251B, data code element 502, and other code elements 503, a null character 1301 was also inserted.

[0347] Regarding the null character 1301, the in-phase component I is zero (0), and the orthogonal component Q is zero (0). Furthermore, although it is referred to here as the "null character," it is not limited to this name.

[0348] Furthermore, in Figure 14 In this process, a null character is inserted into carrier 19. Furthermore, the method of inserting the null character is not subject to... Figure 14 Due to limitations of the configuration shown, for example, a null character can be inserted at a specific time, or at a specific frequency domain and time domain, or continuously inserted in the time domain and frequency domain, or discretely inserted in the time domain and frequency domain.

[0349] exist Figure 13 The carrier A and time B contain code elements. Figure 14 When carrier A and time B contain code elements, Figure 13 The code of carrier A at time $B and Figure 14 The symbols of carrier A at time B are transmitted at the same time and frequency. Additionally, Figure 13 , Figure 14 The frame structure shown is just one example.

[0350] and, Figure 13 , Figure 14 The other code elements in the text are equivalent to " Figure 2 The code elements of "preamble signal 252" and "control information code element signal 253" are therefore, in conjunction with... Figure 13 The other code elements 403 are from the same time and at the same frequency (same carrier). Figure 14 In the case of other code elements 503 transmitting control information, the same data (the same control information) can also be transmitted.

[0351] In addition, although the idea is Figure 13 Frames and Figure 14 The frames are simultaneously received by the receiving device, even if the receiving device... Figure 13 frames or Figure 14 The receiving device can also receive the data sent by the transmitting device from the frame.

[0352] The phase-changing unit 209B takes the baseband signal 208B and the control signal 200 as inputs, performs phase-changing on the baseband signal 208B based on the control signal 200, and outputs the phase-changed signal 210B. The baseband signal 208B is set as a function of symbol number i, represented as x'(i). Thus, the phase-changed signal 210B(x(i)) can be expressed as x(i) = e j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit. Furthermore, the operation of the phase change unit 209B can also be the CDD or CSD described in Non-Patent Document 2 and Non-Patent Document 3.

[0353] Furthermore, the phase-changing unit 209B performs phase changes on symbols existing in the frequency axis direction. That is, the phase-changing unit 209B performs phase changes on data symbols, pilot symbols, control information symbols, etc. At this time, the null character can also be considered as an object of phase change. Therefore, the symbols that become objects of symbol number i are data symbols, pilot symbols, control information symbols, preambles (other symbols), null characters, etc.

[0354] However, since the in-phase component I is zero (0) and the quadrature component Q is zero (0), even if a phase shift is applied to the null character, the signal before the phase shift is the same as the signal after the phase shift. Therefore, the null character can also be interpreted as not being the object of phase shifting. Figure 2 In this case, since the phase change unit 209B performs phase change on the baseband signal 208B, therefore for Figure 14 The recorded symbols undergo phase changes. In response to... Figure 2 When the baseband signal 208A undergoes phase change, for Figure 13 The recorded symbols undergo phase changes. This will be explained later.

[0355] Therefore, in Figure 14 In the frame, for time $1, all the symbols of all carriers (other symbols 503), Figure 2 The phase change unit 209B performs a phase change. However, the processing of the phase change for the null character 1301 is the same as described above.

[0356] same, Figure 2 The phase-changing unit 209B performs phase changes for the following symbols, namely:

[0357] "All symbols of all carriers at time $2 (other symbols 503)"

[0358] "All symbols of all carriers at time $3 (other symbols 503)"

[0359] "All symbols of all carriers at time $4 (other symbols 503)"

[0360] "All symbols of all carriers at time $5 (pilot symbol 501 or data symbol 502)".

[0361] "All symbols of all carriers at time $6 (pilot symbol 501 or data symbol 502)".

[0362] "All symbols of all carriers at time $7 (pilot symbol 501 or data symbol 502)"

[0363] "All symbols of all carriers at time $8 (pilot symbol 501 or data symbol 502)"

[0364] "All symbols of all carriers at time $9 (pilot symbol 501 or data symbol 502)".

[0365] "All symbols of all carriers at time $10 (pilot symbol 501 or data symbol 502)"

[0366] "All symbols of all carriers at time $11 (pilot symbol 501 or data symbol 502)", however, the handling of the phase change of the null character 1301 is the same as described above.

[0367] The following records are omitted.

[0368] The phase change value in the phase change unit 209B is represented as Ω(i). The baseband signal 208B is x'(i), and the phase-changed signal 210B is x(i). Therefore, x(i) = Ω(i) × x'(i) holds true. For example, the phase change value is set as follows: Q is an integer greater than or equal to 2, and Q is the period of the phase change.

[0369] [Formula 38]

[0370]

[0371] j is the imaginary unit. However, equation (38) is only an example and is not limited to it.

[0372] For example, Ω(i) can be set in a way that uses a periodic Q to perform phase changes.

[0373] And it can also be, for example, in Figure 5 , Figure 14 In this approach, the same phase change value is assigned to the same carrier, while the phase change value is set for each carrier individually. For example, it becomes as shown below.

[0374] ·against Figure 5 , Figure 14 The carrier 1 in the middle is independent of time, and the phase change value is set as formula 39.

[0375] [Formula 39]

[0376] e j×0×π ...Formula (39)

[0377] ·against Figure 5 , Figure 14 The carrier 2 in the middle is independent of time, and the phase change value is set to the number 40.

[0378] [Formula 40]

[0379]

[0380] ·against Figure 5 , Figure 14 The carrier 3 in the middle is independent of time, and the phase change value is set as formula 41.

[0381] [Formula 41]

[0382]

[0383] ·against Figure 5 , Figure 14 The carrier 4 in the middle is independent of time, and the phase change value is set as formula 42.

[0384] [Formula 42]

[0385]

[0386] The following records are omitted.

[0387] The above is Figure 2 An example of the operation of the phase change unit 209B.

[0388] In response to Figure 2 The effects obtained by the phase change unit 209B will be explained.

[0389] exist" Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The other code elements 403 and 503 of the "frame" include control information code elements. As described above, these control information code elements are from the same time and at the same frequency (same carrier) as the other code elements 403. Figure 5 Other code elements 503 transmit the same data (the same control information) when transmitting control information.

[0390] However, the following situation should be taken into consideration.

[0391] Case 2: Control information code elements pass through Figure 1 The antenna can be transmitted from either antenna section #A 109_A or antenna section #B 109_B.

[0392] In the transmission scenario shown in "Case 2", since the number of antennas transmitting control information symbols is 1, compared to the case of "using both antennas #A 109_A and antennas #B 109_B to transmit control information symbols", the spatial diversity gain is smaller. Therefore, in "Case 2", even if... Figure 8 If the receiving device fails to receive the data, the data reception quality will also decrease. Therefore, in order to improve the data reception quality, it is best to "use both antenna sections #A 109_A and #B 109_B to transmit control information symbols".

[0393] Scenario 3: Utilizing Figure 1 The antenna sections #A 109_A and #B 109_B transmit control information symbols. However, in Figure 2 The phase change unit 209B in the middle does not perform phase change.

[0394] In the transmission case shown in "Case 3", since the modulation signal transmitted from antenna section #A109_A is the same as or offset from the modulation signal transmitted from antenna section #B109_B by a specific phase, due to the propagation environment of the radio waves, Figure 8 The receiving device may receive a poor-quality signal, thus both modulated signals will be affected by the same multipath effect. Therefore, in Figure 8 In the receiving device, there will be a phenomenon of reduced data reception quality.

[0395] To mitigate this phenomenon, Figure 2 A phase-changing unit 209B is provided. Accordingly, since the phase changes in the time or frequency direction, therefore... Figure 8 In the receiving device, the possibility of receiving a poor-quality signal can be reduced. Furthermore, since the modulation signal transmitted from antenna section #A109_A is more likely to be affected by multipath effects and differs from the modulation signal transmitted from antenna section #B109_B, the possibility of obtaining diversity gain is high. Therefore, in Figure 8 The receiving device can improve the quality of data reception.

[0396] For the reasons mentioned above, therefore in Figure 2 A phase change unit 209B is installed, and phase change is performed.

[0397] In addition to control information symbols, other symbols 403 and 503 include, for example, symbols for signal detection, symbols for frequency and time synchronization, and symbols for channel estimation, for demodulating and decoding control information symbols. Furthermore, in the context of… Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The frame includes pilot symbols 401 and 501. By utilizing these symbols, the control information symbols can be demodulated and decoded with higher accuracy.

[0398] Furthermore, in " Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 In the frame, multiple streams are transmitted using the same frequency (band) and time through data symbols 402 and 502, i.e., MIMO transmission is performed. In order to demodulate these data symbols, other symbols 403 and other symbols 503 contain symbols for signal detection, frequency synchronization and time synchronization, and channel estimation.

[0399] At this time, the "other symbols 403 and other symbols 503, including symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation", are phase-changed by the phase-changing unit 209B as described above.

[0400] In this situation, if there is no response to this processing for data symbols 402 and 502 (specifically, data symbol 502 in the above description), and the receiving device demodulates and decodes data symbols 402 and 502, the process is likely to become complex because it requires demodulation and decoding in response to the phase change processing performed by the phase change unit 209B. The phase change unit 209B performs phase changes on "other symbols 403 and the symbols included in other symbols 503, such as those for signal detection, frequency synchronization, time synchronization, and channel estimation."

[0401] However, as Figure 2 As shown, the advantage here is that when the phase change unit 209B performs phase change on data symbol 402 and data symbol 502 (data symbol 502 in the above description), the receiving device can easily demodulate and decode data symbol 402 and data symbol 502 by using the channel estimation signal (the estimation signal of the transport path change) estimated by "other symbols 403 and other symbols 503 including symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation".

[0402] In addition, such as Figure 2 As shown, when the phase change unit 209B performs phase change on data symbol 402 and data symbol 502 (data symbol 502 in the above description), the effect of the sharp drop in electric field intensity in the frequency axis in the multipath can be reduced, thereby improving the reception quality of data of data symbol 402 and data symbol 502.

[0403] Thus, the difference between "the object of the symbol that performs the phase change of the phase change unit 205B" and "the object of the symbol that performs the phase change of the phase change unit 209B" becomes a distinctive feature.

[0404] As mentioned above, through Figure 2 The phase-changing unit 205B performs phase changing, which can obtain data symbol 402 and data symbol 502. For example, in a LOS environment, this improves the data reception quality in the receiving device. Figure 2 The phase change unit 209B performs phase change, for example, it can improve the " Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The control information symbols contained in the frame affect the reception quality in the receiving device, and can simplify the demodulation and decoding of data symbols 402 and 502.

[0405] In addition, through Figure 2 The phase-changing unit 205B performs phase changing, thereby improving the reception quality of data symbols 402 and 502 in the receiving device, for example, in a LOS environment. Furthermore, by... Figure 2 The phase-changing unit 209B performs phase changes on data symbol 402 and data symbol 502, thereby improving the reception quality of data symbol 402 and data symbol 502.

[0406] in addition, Figure 2 Although the example shows a configuration where the phase-changing unit 209B is placed after the insertion unit 207B to perform phase changing on the baseband signal 208B, the configuration that achieves the phase-changing effect of the phase-changing unit 205B and the phase-changing effect of the phase-changing unit 209B described above is not affected by the configuration. Figure 2 The shown composition is limited.

[0407] For example, it could also be a variation like the following, where in the construction of this variation, from... Figure 2 In the configuration, the phase change unit 209B is removed, the baseband signal 208B output from the insertion unit 207B is set as the signal 106_B after signal processing, and a phase change unit 209A that performs the same operation as the phase change unit 209B is added after the insertion unit 207A. The phase-changed signal 210A after the phase change unit 209A changes the phase of the baseband signal 208A is used as the signal 106_A after signal processing.

[0408] Even with this structure, it still differs from the above. Figure 2 Similarly, by performing phase change by phase change unit 205B, the reception quality of data symbols 402 and 502 in the receiving device can be improved, for example, in a LOS environment. Furthermore, by performing phase change on data symbols 402 and 502 by phase change unit 209A, the reception quality of data symbols 402 and 502 can be improved.

[0409] Moreover, it is possible to obtain " Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The control information symbols contained in the frame improve the reception quality in the receiving device.

[0410] (Supplement 1)

[0411] In Embodiment 1, etc., the operation of the "phase change unit B" may also be the CDD / CSD described in Non-Patent Documents 2 and 3. Further explanation is provided regarding this point.

[0412] Figure 15 The configuration using CDD / CSD is shown. The modulated signal 1501, denoted as X[n], is the signal without cyclic delay.

[0413] The cyclic delay unit (circular delay unit) 1502_1 takes the modulation signal 1501 as input, performs cyclic delay (circular delay) processing, and outputs the cyclic delay processed signal 1503_1. The cyclic delay processed signal 1503_1 is set as X1[n], and X1[n] is given by the following formula.

[0414] [Formula 43]

[0415] X1[n]=X[(n-δ1)mod N]···Formula (43)

[0416] Additionally, δ1 is the cycle delay (δ1 is an integer greater than or equal to 0), 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 N-1. Furthermore, mod stands for modulo, and "A mod B" means "the remainder when B is divided by A". ... The cyclic delay unit (cycle delay unit) 1502_M takes the modulated signal 1501 as input, performs cyclic delay (cycle delay) processing, and outputs the cyclically delayed signal 1503_M. The cyclically delayed signal 1503_M is set as XM[n], which is given by the following formula.

[0417] [Formula 44]

[0418] XM[n]=X[(n-δM)mod N]···Formula (44)

[0419] In addition, δM is the cycle delay (δM is an integer greater than or equal to 0), and X[n] is considered to be composed 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.

[0420] Therefore, the cyclic delay unit (circular delay unit) 1502_i takes the modulation signal 1501 as input, performs cyclic delay (circular delay) processing, and outputs the cyclically delayed signal 1503_i. Let the cyclically delayed signal 1503_i be Xi[n], where Xi[n] is given by the following formula: i is an integer greater than or equal to 1 and less than or equal to M, and M is an integer greater than or equal to 1.

[0421] [Formula 45]

[0422] Xi[n]=X[(n-δi)mod N]···Formula (45)

[0423] Additionally, δi is the cycle delay (δi is an integer greater than or equal to 0), which is considered here as X[n] consisting of N samples (N is an integer greater than or equal to 2). Therefore, n is an integer greater than or equal to N-1.

[0424] Furthermore, the signal 1503_i after cyclic delay processing is transmitted by antenna i. Therefore, the signals 1503_1, ..., 1503_M after cyclic delay processing are transmitted by different antennas. Although the above explanation uses discrete signals as an example, the same processing can also be applied to continuous signals.

[0425] In this way, diversity can be achieved through cyclic delay, thereby mitigating the adverse effects of delayed waves and improving the quality of data reception in the receiving device.

[0426] For example, it can be Figure 2 The phase change unit 209B is replaced with Figure 15 The cyclic delay section shown makes the operation of the phase change section 209B the same as that of the cyclic delay section.

[0427] Therefore, in Figure 2 The phase-changing unit 209B provides a cycle delay amount δ (δ is an integer greater than or equal to 0), and represents the input signal of the phase-changing unit 209B as Y[n]. Furthermore, when the output signal of the phase-changing unit 209B is represented as Z[n], Z[n] is given by the following formula.

[0428] [Formula 46]

[0429] Z[n]=Y[(n-δ)mod N]···Formula (46)

[0430] Furthermore, Y[n] is considered here to consist of N samples (N is an integer greater than or equal to 2), therefore, n is an integer greater than or equal to N-1.

[0431] Next, the relationship between the cycle delay and the phase change will be explained.

[0432] For example, consider the application of CDD / CSD in OFDM. Additionally, the carrier configuration when using OFDM is as follows: Figure 16 As shown.

[0433] exist Figure 16 In this code, 1601 represents the symbol, and the horizontal axis represents the frequency (carrier number). The carriers are arranged in ascending order from low frequency to high frequency. Therefore, when the lowest frequency carrier is designated as "carrier 1", "carrier 2", "carrier 3", "carrier 4", and so on are arranged sequentially after it.

[0434] And, for example, in Figure 2 The phase change unit 209B provides the cycle delay τ. Thus, the phase change value Ω[i] in "carrier i" can be represented as follows.

[0435] [Formula 47]

[0436] Ω[i]=e j×μ×i ...Formula (47)

[0437] Additionally, μ is the cycle delay, a value that can be obtained from the FFT (Fast Fourier Transform) size, etc.

[0438] Furthermore, when the baseband signal of “carrier i” at time t before phase change (before the cycle delay processing) is set as v'[i][t], the signal v[i][t] of “carrier i” at time t after phase change can be expressed as v[i][t]=Ω[i]×v'[i][t].

[0439] (Supplement 2)

[0440] Of course, the implementation methods described in this specification can be combined in various ways to perform them.

[0441] Furthermore, the various implementation methods and other content are merely examples. For instance, even if "modulation method, error correction coding method (error correction code used, code length, coding rate, etc.), control information, etc." are shown, they can still be implemented with the same configuration even if other "modulation method, error correction coding method (error correction code used, code length, coding rate, etc.), control information, etc." are applied.

[0442] Regarding the modulation method, even when using a modulation method other than that described in this application, the implementation method described in this application can still be performed, and other functions can be executed. For example, APSK (Amplitude Phase Shift Keying) (e.g., 16APSK, 64APSK, 128APSK, 256APSK, 1024APSK, 4096APSK, etc.), PAM (Pulse Amplitude Modulation) (e.g., 4PAM, 8PAM, 16PAM, 64PAM, 128PAM, 256PAM, 1024PAM, 4096PAM, etc.), PSK (e.g., BPSK, QPSK, 8PSK, 16PSK, 64PSK, 128PSK, 256PSK, 1024PSK, 4096PSK, etc.), and QAM (Quadrature Modulation) can also be applied. Amplitude Modulation (e.g., 4QAM, 8QAM, 16QAM, 64QAM, 128QAM, 256QAM, 1024QAM, 4096QAM, etc.) can be uniform or non-uniform mapping in each modulation method.

[0443] Furthermore, the configuration methods for 2, 4, 8, 16, 64, 128, 256, and 1024 signal points in the IQ plane (modulation methods with 2, 4, 8, 16, 64, 128, 256, and 1024 signal points) are not limited to the signal point configuration method of the modulation method shown in this application. Therefore, the function of outputting in-phase and quadrature components based on multiple bits becomes the function of the mapping unit, and thereafter, the execution of precoding and phase transformation becomes an effective function of this application.

[0444] Furthermore, in this application, where there is In this case, Indicates a universal quantifier. Existential quantifier.

[0445] Furthermore, in this application, in the case of a complex plane, the unit of phase, such as the deflection angle, is "radian".

[0446] If the complex plane is used, the polar coordinates of complex numbers can be represented in polar form. A point (a, b) on the complex plane can correspond to the complex number z = a + jb (where a and b are real numbers, and j is the imaginary unit), and this point can be represented by polar coordinates [r, θ], thus a = r × cosθ, b = r × sinθ [Equation 48]

[0447]

[0448] This holds true, where r is the absolute value of z (r = |z|), and θ is the angle of deflection. Furthermore, z = a + jb is derived from r × e. jθ To express.

[0449] In this application, the receiving device and the antenna of the terminal can be configured separately. For example, the receiving device may have an interface for inputting signals received by the antenna, or signals after frequency conversion of signals received by the antenna, via a cable, and the receiving device may perform subsequent processing thereafter.

[0450] Furthermore, the data and information obtained by the receiving device are subsequently converted into images or sound, which can be displayed on a monitor or output through speakers. Moreover, the data and information obtained by the receiving device undergoes signal processing related to images or sound, and can be output from the receiving device via RCA terminals (video terminals, audio terminals), USB (Universal Serial Bus), HDMI (High-Definition Multimedia Interface), digital terminals, etc. Alternatively, the effects of this application can be achieved even without performing signal processing related to images or sound.

[0451] In this application, the transmitting device can be, for example, a broadcasting station, base station, access point, terminal, mobile phone, or other communication and broadcasting equipment. Similarly, the receiving device can be, for example, a television set, radio, terminal, personal computer, mobile phone, access point, base station, or other communication equipment. Furthermore, the transmitting and receiving devices in this application are devices with communication functions, and these devices can be configured to connect to a television set, radio, personal computer, mobile phone, or other device using a mobile phone via some interface.

[0452] Furthermore, in this embodiment, symbols other than data symbols, such as pilot symbols (preamble, unique word, sync code, reference symbol, etc.) and symbols for control information, can be configured at any position in the frame. Also, although referred to here as pilot symbols and symbols for control information, any naming method can be used; the important thing is the function itself.

[0453] Pilot symbols, for example, in a transceiver, can be any known symbols that are modulated using PSK modulation. The receiver uses these symbols for frequency synchronization, time synchronization, channel state information (CSI) estimation (for each modulated signal), signal detection, and so on. Furthermore, through synchronization, the receiver can also determine the pilot symbols transmitted by the transmitter.

[0454] Furthermore, the symbols used for control information are symbols used to transmit information that needs to be transmitted to the communication partner in order to achieve communication other than data (e.g., application data). For example, they are symbols used to transmit the modulation method, error correction coding method and the coding rate of the error correction coding method, and the setting information of the upper layer used in the communication.

[0455] Furthermore, this application is not limited to the various embodiments and can be implemented with various modifications. For example, in the various embodiments, the case of being a communication device has been described, but it is not limited thereto, and these communication methods can also be implemented as software.

[0456] Furthermore, although the precoding switching method in the method of transmitting two modulated signals from two antennas has been described above, it is not limited to this. Even in the method of precoding four mapped signals to generate four modulated signals and transmitting them from four antennas, the precoding weights (precoding matrix) can be changed in the same way, and it can also be executed as a precoding switching method. In other words, it can be executed in the same way in the method of precoding N mapped signals to generate N modulated signals and transmitting them from N antennas.

[0457] Although terms such as "precoding" and "precoding weights" are used in this application, the names themselves can be arbitrary. What is important in this application is the signal processing itself.

[0458] Different data can be transmitted through streams s1(t) and s2(t), or the same data can be transmitted.

[0459] Although only one transmitting antenna of the transmitting device and one receiving antenna of the receiving device are shown in the figure, they can also be composed of multiple antennas.

[0460] Although the transmitting device notifies the receiving device of the transmission method (MIMO, SISO, time-space block coding, optical cross-wavelength division multiplexing), modulation method, and error correction coding method, this information can also exist within the frames transmitted by the transmitting device. The receiving device uses this information to make changes to its operation.

[0461] Alternatively, the program that executes the above communication method can be pre-stored in ROM (Read Only Memory) and made to work by CPU (Central Processor Unit).

[0462] Furthermore, the program that executes the above communication method can be stored in a computer-readable recording medium, and the program stored in the recording medium can be recorded in the computer's RAM (Random Access Memory) so that the computer can work according to the program.

[0463] Furthermore, the various embodiments and configurations described above can typically be implemented as LSI (Large Scale Integration) of an integrated circuit. These can be fabricated separately on a single chip, or all or a portion of the configurations of each embodiment can be fabricated on a single chip.

[0464] Here, although LSI is shown, it can also be called IC (Integrated Circuit), System LSI, Super LSI, or Extreme Super LSI depending on the level of integration. Furthermore, the method of integrated circuit implementation is not limited to LSI; it can also be implemented using dedicated circuits or general-purpose processors. After LSI manufacturing, programmable FPGAs (Field Programmable Gate Arrays) or reconfigurable processors capable of reconfiguring the connections or settings of the internal circuit units of the LSI can also be used.

[0465] Furthermore, as semiconductor technology advances or other derived technologies emerge to replace LSI in integrated circuits, this technology can also be used for the integration of functional blocks. Furthermore, applications in biotechnology will also become possible.

[0466] This application is widely applicable to wireless systems that transmit different modulated signals from multiple antennas. Furthermore, it is also applicable to MIMO transmission in wired communication systems with multiple transmission locations (e.g., PLC (Power Line Communication) systems, optical communication systems, DSL (Digital Subscriber Line) systems).

[0467] (Implementation Method 2)

[0468] In this embodiment, compared with embodiment 1... Figure 2 The implementation methods for different configurations will be explained.

[0469] Figure 1 An example of the configuration of a transmitting device such as a base station, access point, or broadcasting station in this embodiment is shown. Since detailed descriptions have been provided in Embodiment 1, they are omitted here.

[0470] The signal processing unit 106 takes the mapped signals 105_1 and 105_2, signal group 110, and control signal 100 as inputs, performs signal processing according to control signal 100, and outputs processed signals 106_A and 106_B. At this time, processed signal 106_A is represented by u1(i), and processed signal 106_B is represented by u2(i). i is the symbol number, for example, i is an integer greater than or equal to 0. Further details regarding signal processing will be provided using... Figure 18 Let me explain.

[0471] Figure 18 It shows Figure 1 An example of the configuration of the signal processing unit 106. The weighted synthesis unit (precoding unit) 203 processes the mapped signal 201A ( Figure 1 The mapped signal 105_1), the mapped signal 201B ( Figure 1 The mapped signal 105_2), and the control signal 200 ( Figure 1 Using control signal 100 as input, the signal is weighted and synthesized (pre-encoded) according to control signal 200, outputting weighted signals 204A and 204B. At this point, the mapped signal 201A is represented by s1(t), the mapped signal 201B by s2(t), the weighted signal 204A by z1(t), and the weighted signal 204B by z2'(t). Additionally, as an example, t represents time. s1(t), s2(t), z1(t), and z2'(t) are defined by complex numbers, and therefore can also be real numbers.

[0472] Here, although it is treated as a function of time, it can also be treated as a function of "frequency (carrier number)," or as a function of "time and frequency." Furthermore, it can also be a function of "symbol number." This is the same as in Implementation Method 1.

[0473] The weighted synthesis unit (precoding unit) 203 performs the operation of equation (1).

[0474] Furthermore, the phase-changing unit 205B takes the weighted synthesized signal 204B and the control signal 200 as inputs, performs phase changing on the weighted synthesized signal 204B according to the control signal 200, and outputs the phase-changed signal 206B. Alternatively, the phase-changed signal 206B can be represented by z2(t), where z2(t) is defined by a complex number or can be a real number.

[0475] The specific operation of the phase-changing unit 205B will be explained. In the phase-changing unit 205B, for example, a phase change of y(i) is performed for z2'(i). Therefore, it can be expressed as z2(i) = y(i) × z2'(i). i is the symbol number, and i is an integer greater than or equal to 0.

[0476] For example, the phase change value is set as shown in equation (2). N is an integer greater than or equal to 2, and N is the period of the phase change. Furthermore, if N is set to an odd number greater than or equal to 3, there is a possibility of improving reception quality. However, equation (2) is only an example and is not a limitation. Therefore, the phase change value y(i) = e j×δ(i) To express.

[0477] At this point, z1(i) and z2(i) can be represented by equation (3). Furthermore, δ(i) is a real number. Also, z1(i) and z2(i) are transmitted from the transmitting device at the same time and at the same frequency (same frequency band). In equation (3), the value of the phase change is not limited to equation (2); for example, a method of performing periodic, regular phase changes can be considered.

[0478] Furthermore, as explained in Embodiment 1, the (precoding) matrix in Equations (1) and (3) can be derived from Equations (5) to (36), etc. However, the precoding matrix is ​​not limited to these, and the same applies to Embodiment 1.

[0479] The insertion unit 207A takes the weighted synthesized signal 204A, pilot symbol signal pa(t) 251A, preamble signal 252, control information symbol signal 253, and control signal 200 as inputs, and outputs a baseband signal 208A based on the frame composition information contained in the control signal 200. Here, t represents time.

[0480] Similarly, the insertion unit 207B takes the phase-changed signal 206B, the pilot symbol signal pb(t) 251B, the preamble signal 252, the control information symbol signal 253, and the control signal 200 as inputs, and outputs the baseband signal 208B based on the frame composition information contained in the control signal 200.

[0481] The phase-changing unit 209A takes the baseband signal 208A and the control signal 200 as inputs, performs phase changing on the baseband signal 208A based on the control signal 200, and outputs the phase-changed signal 210A. The baseband signal 208A is used as a function of symbol number i, represented as x'(i). Thus, the phase-changed signal 210A(x(i)) can be expressed as x(i) = e j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[0482] Furthermore, as described in Embodiment 1, the operation of the phase-changing unit 209A can also be the CDD / CSD described in Non-Patent Documents 2 and 3. Moreover, the phase-changing unit 209A performs phase changes on symbols present in the frequency axis direction. That is, the phase-changing unit 209A performs phase changes on data symbols, pilot symbols, control information symbols, etc.

[0483] Figure 3 It shows Figure 1 An example of the configuration of the wireless units 107_A and 107_B. Figure 4 yes Figure 1 The frame structure of the transmitted signal 108_A, Figure 5 It shows Figure 1 The frame structure of the transmission signal 108_B is described in detail in Embodiment 1, so the description is omitted here.

[0484] exist Figure 4 The carrier A and time B contain code elements. Figure 5 When carrier A and time B contain code elements, Figure 4 The code elements of carrier A and time B are Figure 5 The symbols of carrier A and time B are transmitted at the same time and frequency. Furthermore, regarding frame composition, it is not affected by... Figure 4 , Figure 5 limited, Figure 4 and Figure 5 This is just an example of what a frame is made of.

[0485] and, Figure 4 and Figure 5 The other code elements in the text are equivalent to " Figure 2 The code elements of "preamble signal 252" and "control information code element signal 253" are therefore, in conjunction with... Figure 4 The other code elements 403 are from the same time and at the same frequency (same carrier). Figure 5 In the case of other code elements 503 transmitting control information, the same data (the same control information) is transmitted.

[0486] In addition, although the idea is Figure 4 frames and Figure 5The frames are simultaneously received by the receiving device, even if the receiving device... Figure 4 frames or Figure 5 The receiving device can also obtain the data sent by the transmitting device from the frame.

[0487] Figure 6 It shows the generation Figure 2 An example of the configuration of the part related to the generation of control information signal 253 is provided, but since it has been described in detail in Embodiment 1, the description is omitted here.

[0488] Figure 7 It shows Figure 1 An example of the configuration of antenna section #A 109_A and antenna section #B 109_B. Figure 7 An example is shown where antenna section #A 109_A and antenna section #B 109_B are composed of multiple antennas. Since a detailed description has been provided in Embodiment 1, the description is omitted here.

[0489] Figure 8 It shows Figure 1 The transmitting device, for example, transmits Figure 4 and Figure 5 An example of a receiving device configuration for receiving a modulated signal when a transmission signal consisting of frames is given, which has been described in detail in Embodiment 1, is omitted here.

[0490] Figure 10 It shows Figure 8 An example of the configuration of antenna section #X 801X and antenna section #Y 801Y. Figure 10 An example is shown where antenna section #X 801X and antenna section #Y 801Y are composed of multiple antennas. Since a detailed description has been provided in Embodiment 1, the description is omitted here.

[0491] then, Figure 1 The signal processing unit 106 of the transmitting device shown is as follows: Figure 18 Phase change unit 205B and phase change unit 209A are inserted as shown. The features and effects at this time will be explained.

[0492] Such as using Figure 4 and Figure 5 As explained, the pre-coding (weighted synthesis) is performed on the mapped signal s1(i)201A obtained by mapping using the first series and the mapped signal s2(i)201B obtained by mapping using the second series. The phase-changing unit 205B performs phase transformation on one of the weighted synthesized signals 204A and 204B. i is the symbol number, and i is an integer greater than or equal to 0.

[0493] Furthermore, the weighted combined signal 204A and the phase-changed signal 206B are transmitted at the same frequency and at the same time. Therefore, in Figure 4 and Figure 5 In China, Figure 5 The data symbol 502 undergoes a phase change. Figure 18 In this process, since the phase-changing unit 205 targets the weighted and synthesized signal 204B, therefore... Figure 5 The data symbol 502 undergoes a phase change. When performing a phase change on the weighted synthesized signal 204A, the... Figure 4 The data symbol 402 undergoes a phase change. This will be explained later.

[0494] For example, Figure 11 It shows that, for Figure 5 From the frames, carriers 1 to 5 and time intervals $4 to $6 were extracted. Additionally, with... Figure 5 Similarly, pilot symbol 501, data symbol 502, and other symbols 503 are shown.

[0495] As mentioned above, in Figure 11 In the symbols shown, the phase change unit 205B performs phase change for the data symbols in (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6).

[0496] Therefore, will be with Figure 11 The phase change value corresponding to the shown data symbol is set as follows: at (carrier 1, time $5), it is set to "e". j×δ15(i) “”, set to “e” in (carrier 2, time $5) j×δ25(i) “”, set to “e” in (carrier 3, time $5) j×δ35(i) “”, set to “e” in (carrier 4, time $5) j×δ45(i) “”, set to “e” in (carrier 5, time $5) j×δ55(i) “”, set to “e” in (carrier 1, time $6) j×δ16(i) “”, set to “e” in (carrier 2, time $6) j×δ26(i) “”, set to “e” in (carrier 4, time $6) j×δ46(i) “”, set to “e” in (carrier 5, time $6) j×δ56(i) ".

[0497] Furthermore, in Figure 11Of the symbols shown, the other symbols in (carrier 1, time $4), (carrier 2, time $4), (carrier 3, time $4), (carrier 4, time $4), (carrier 5, time $4), and the pilot symbols in (carrier 3, time $6) are not the targets of phase change by the phase change unit 205B.

[0498] This is a characteristic of the phase change unit 205B. Additionally, in relation to... Figure 11 The data symbols in the phase-change objects (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are "the same carrier, the same time". Figure 4 The data carrier is configured in the middle.

[0499] That is, in Figure 4 In the diagram, (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are data symbols.

[0500] That is, the data symbols used in MIMO transmission of multiple streams are the targets of phase change by the phase change unit 205B.

[0501] Furthermore, as an example of the phase change unit 205B performing phase changes on data symbols, as shown in equation (2), there are methods for performing regular phase changes on data symbols and phase changes with a period of N. However, the methods for performing phase changes on data symbols are not limited to this.

[0502] Thus, in environments dominated by direct sunlight, such as LOS environments, it is possible to improve the reception quality of data symbols for MIMO transmissions carrying multiple streams in the receiving device. This effect will be explained.

[0503] For example, Figure 1 The modulation scheme used by the mapping unit 104 is QPSK. Figure 18 The mapped signal 201A is a QPSK signal, and the mapped signal 201B is also a QPSK signal. That is, two QPSK streams are sent.

[0504] Thus, in Figure 8The signal processing unit 811, for example, uses channel estimation signals 806_1 and 806_2 to obtain 16 candidate signal points. QPSK can transmit 2 bits; since there are two streams, a total of 4 bits are transmitted. Therefore, there are 2... 4 = 16 candidate signal points. In addition, 16 other candidate signal points can be obtained using channel estimation signals 808_1 and 808_2. Since the explanation is the same, the focus of the explanation will be on the 16 candidate signal points obtained using channel estimation signals 806_1 and 806_2.

[0505] An example of this state is given by Figure 12 As shown. In Figure 12 A and Figure 12 In plane B, the horizontal axis represents in-phase I and the vertical axis represents quadrature Q. In the in-phase I-quadrature Q plane, there are 16 candidate signal points. Among these 16 candidate signal points, one is a signal point transmitted by the transmitting device. Therefore, they are called "16 candidate signal points".

[0506] In environments dominated by direct sunlight, such as in a LOS environment, the first scenario can be considered. Figure 18 In the case where the phase change unit 205B is absent, that is... Figure 18 The phase change unit 205B does not perform phase change.

[0507] In the "first scenario," since no phase change occurs, it is possible to fall into... Figure 12 The state shown in A. Trapped in... Figure 12 In state A, as shown in "signal points 1201, 1202", "signal points 1203, 1204, 1205, 1206", and "signal points 1207, 1208", due to the presence of densely packed signal points, therefore... Figure 8 In a receiving device, there is a possibility of reduced data reception quality.

[0508] To overcome this phenomenon, Figure 18 A phase-changing unit 205B is inserted. If the phase-changing unit 205B is inserted, since the symbol number i, therefore... Figure 12 The symbol number shown in A indicates a region with dense signal points, and... Figure 12 As shown in B, the symbol numbering is mixed up due to the large distance between signal points. To address this situation, by introducing error-correcting codes, a high error-correction capability can be achieved. Figure 8 In the receiving device, high data reception quality can be obtained.

[0509] In addition, Figure 18In the context of channel estimation, specifically for "pilot symbols and preambles" used to demodulate (detect) data symbols such as pilot symbols and preambles, [the text is incomplete]. Figure 18 The phase-changing unit 205B does not perform phase changing. Therefore, in data symbols, it is possible to achieve "due to symbol number i, there exists..." Figure 12 The symbol number of the "dense signal point area" shown in A, and... Figure 12 B illustrates the mixing of symbol numbers where "the distance between signal points is large".

[0510] However, even for "pilot symbols and preambles" used in channel estimation for demodulating (detecting) data symbols such as pilot symbols and preambles, in Figure 18 When the phase change unit 205B performs a phase change, the following situation may also occur: "In the data symbol, "due to symbol number i, there exists..." Figure 12 The symbol number of the "dense signal point area" shown in A, and... Figure 12 B illustrates the mixing of symbol numbers where "the distance between signal points is large".

[0511] In this case, it is necessary to add certain conditions to the pilot symbols and preamble for phase changes. For example, one possible approach is to set different rules than those for phase changes of the data symbols, such as "perform phase changes on the pilot symbols and / or preamble." As an example, this could involve performing regular phase changes of period N on the data symbols and regular phase changes of period M on the pilot symbols and / or preamble. N and M are integers greater than or equal to 2.

[0512] As described above, the phase-changing unit 209A takes the baseband signal 208A and the control signal 200 as inputs, performs phase-changing on the baseband signal 208A according to the control signal 200, and outputs the phase-changed signal 210A. The baseband signal 208A is used as a function of symbol number i, represented as x'(i). Thus, the phase-changed signal 210A(x(i)) can be expressed as x(i) = e j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[0513] Furthermore, the operation of the phase-changing unit 209A can also be that of the CDD / CSD described in Non-Patent Documents 2 and 3. The phase-changing unit 209A performs phase changes on symbols present in the frequency axis direction. The phase-changing unit 209A performs phase changes on data symbols, pilot symbols, control information symbols, etc. Therefore, in this case, the symbol referred to as symbol number i becomes a data symbol, pilot symbol, control information symbol, preamble (other symbols), etc.

[0514] exist Figure 18 In this process, since the phase change unit 209A performs phase change on the baseband signal 208A, therefore... Figure 4 Each recorded symbol undergoes a phase change.

[0515] Therefore, in response to Figure 4 All the symbols of all the carriers at time $1 in the frame (other symbols 403), Figure 18 The phase change unit 209A performs phase change.

[0516] same, Figure 18 The phase-changing unit 209A performs phase changes for the following symbols:

[0517] "All symbols of all carriers at time $2 (other symbols 403)"

[0518] "All symbols of all carriers at time $3 (other symbols 403)"

[0519] "All symbols of all carriers at time $4 (other symbols 403)"

[0520] "All symbols of all carriers at time $5 (pilot symbol 401 or data symbol 402)".

[0521] "All the symbols of all carriers at time $6 (pilot symbol 401 or data symbol 402)".

[0522] "All symbols of all carriers at time $7 (pilot symbol 401 or data symbol 402)".

[0523] "All symbols of all carriers at time $8 (pilot symbol 401 or data symbol 402)".

[0524] "All symbols of all carriers at time $9 (pilot symbol 401 or data symbol 402)".

[0525] "All symbols of all carriers at time $10 (pilot symbol 401 or data symbol 402)".

[0526] "All symbols of all carriers at time $11 (pilot symbol 401 or data symbol 402)", omitting the following description.

[0527] Figure 13 It shows Figure 1 The transmission signal 108_A and Figure 4 The different frame configurations are described in detail in Implementation 1, so the description is omitted here.

[0528] Figure 14 It shows Figure 1 The transmission signal 108_B and Figure 5 The different frame configurations are described in detail in Implementation 1, so detailed descriptions are omitted here.

[0529] exist Figure 13 The carrier A and time B contain code elements. Figure 14 When carrier A and time B contain code elements, Figure 13 The code elements of carrier A and time B are Figure 14 The symbols of carrier A and time B are transmitted at the same time and frequency. Additionally, Figure 13 and Figure 14 The frame structure shown is just one example.

[0530] and, Figure 13 and Figure 14 The other code elements in the text are equivalent to " Figure 18 The code elements of "preamble signal 252" and "control information code element signal 253" are therefore, in conjunction with... Figure 13 The other code elements 403 are from the same time and at the same frequency (same carrier). Figure 14 Other code elements 503, when transmitting control information, transmit the same data (the same control information).

[0531] In addition, although the idea is Figure 13 Frames and Figure 14 The frames are received simultaneously by the receiving device, even if the receiving device receives Figure 13 frames or Figure 14 The receiving device can also obtain the data sent by the transmitting device from the frame.

[0532] The phase-changing unit 209A takes the baseband signal 208A and the control signal 200 as inputs, performs phase-changing on the baseband signal 208A according to the control signal 200, and outputs the phase-changed signal 210A. The baseband signal 208A is set as a function of symbol number i, represented as x'(i). i is an integer greater than or equal to 0.

[0533] Thus, the phase-changed signal 210A(x(i)) can be expressed as x(i)=e j×ε(i) ×x'(i). (j is an imaginary unit) Furthermore, the operation of the phase-changing unit 209A can also be the CDD / CSD described in Non-Patent Documents 2 and 3. Furthermore, the phase-changing unit 209A performs phase changes on symbols existing in the frequency axis direction. The phase-changing unit 209A performs phase changes on data symbols, pilot symbols, control information symbols, etc.

[0534] At this point, the null character can also be considered as an object of phase change. Therefore, in this case, the code elements that become the object of code element number i are data code elements, pilot code elements, control information code elements, preamble (other code elements), null characters, etc.

[0535] However, since the in-phase component I of the null character is zero (0), and the quadrature component Q is also zero (0), even if a phase shift is performed on the null character, the signal before the phase shift is the same as the signal after the phase shift. Therefore, the null character can be interpreted as not being the object of phase shifting. Figure 18 In this case, since the phase change unit 209A performs phase change on the baseband signal 208A, therefore... Figure 13 The recorded symbols undergo phase changes.

[0536] Therefore, in response to Figure 13 All the symbols of all the carriers at time $1 in the frame (other symbols 403), Figure 18 The phase change unit 209A performs a phase change. However, the processing of the phase change of the null character 1301 is as described previously.

[0537] same, Figure 18 The phase-changing unit 209A performs phase changes for the following symbols:

[0538] "All symbols of all carriers at time $2 (other symbols 403)"

[0539] "All symbols of all carriers at time $3 (other symbols 403)"

[0540] "All symbols of all carriers at time $4 (other symbols 403)"

[0541] "All symbols (pilot symbol 401 or data symbol 402) for all carriers at time $5"

[0542] "All symbols (pilot symbol 401 or data symbol 402) for all carriers at time $6"

[0543] "All symbols (pilot symbol 401 or data symbol 402) for all carriers at time $7"

[0544] "All symbols (pilot symbol 401 or data symbol 402) for all carriers at time $8"

[0545] "All symbols (pilot symbol 401 or data symbol 402) for all carriers at time $9"

[0546] "All symbols (pilot symbol 401 or data symbol 402) for all carriers at time $10"

[0547] "All symbols (pilot symbol 401 or data symbol 402) for all carriers at time $11"

[0548] The timeline is omitted.

[0549] However, in the above description, the handling of the phase change of the null character 1301 is as previously described, and descriptions of other timing and carriers are omitted.

[0550] The phase change value in the phase change unit 209A is represented as Ω(i). The baseband signal 208A is x'(i), and the phase-changed signal 210A is x(i). Therefore, x(i) = Ω(i) × x'(i) holds true.

[0551] For example, the value of the phase change can be set as in equation (38). Q is an integer greater than or equal to 2, and Q is the period of the phase change. j is the imaginary unit. However, equation (38) is only an example and is not a limitation.

[0552] For example, Ω(i) can also be set by changing the phase using a period Q.

[0553] And, for example, in Figure 4 , Figure 13 In this case, the same phase change value can be applied to the same carrier, while the phase change value can be set for each carrier.

[0554] For example, it becomes as shown below.

[0555] ·against Figure 4 , Figure 13 In carrier 1, the phase change value is set as in equation (39) in a way that is independent of time.

[0556] ·against Figure 4 , Figure 13 The carrier 2 in the middle sets the phase change value as Equation (40) in a way that is independent of time.

[0557] ·against Figure 4 , Figure 13 The carrier 3 in the middle sets the phase change value as Equation (41) in a way that is independent of time.

[0558] ·against Figure 4 , Figure 13 The carrier 4 in the middle sets the phase change value as Equation (42) in a way that is independent of time.

[0559] Descriptions of other carriers are omitted.

[0560] The above is Figure 18 An example of the operation of the phase change unit 209A.

[0561] To Figure 18 The effects obtained by the phase change unit 209A will be explained.

[0562] exist" Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The other code elements 403 and 503 of the "frame" include control information code elements. As described above, in the same time and at the same frequency (same carrier) as other code elements 403, Figure 5 In the case of other code elements 503 transmitting control information, the same data (the same control information) is sent.

[0563] However, as in scenario 2, "utilizing" can be considered. Figure 1 The control information symbols are transmitted using either antenna section #A 109_A or antenna section #B 109_B.

[0564] In the case of transmission as shown in "Case 2", since the number of antennas transmitting control information symbols is only one, compared to the case of "using both antennas #A 109_A and antennas #B 109_B to transmit control information symbols", the spatial diversity gain is smaller in "Case 2". Even so, Figure 8 If the receiving device receives the data, the data reception quality will be reduced. Therefore, from the perspective of improving data reception quality, it is preferable to "use both antenna section #A 109_A and antenna section #B 109_B to transmit control information symbols".

[0565] As for scenario 3, "utilizing" can be considered Figure 1 The antenna sections #A 109_A and #B 109_B are used to transmit control information symbols. However, in Figure 18 The phase change unit 209A in the middle does not perform phase change.

[0566] In the case of transmission as shown in "Case 3", since the modulation signal transmitted from antenna #A 109_A is the same as or offset from the modulation signal transmitted from antenna #B 109_B by a specific phase, due to the propagation environment of the radio waves, Figure 8 The receiving device may receive a very poor quality signal, and both modulated signals will be affected by the same multipath propagation. Therefore, in Figure 8 The receiving device may experience a decrease in data reception quality.

[0567] To mitigate this phenomenon, Figure 18 A phase-changing unit 209A is provided. Therefore, since the phase is changed in the time or frequency direction, it is possible to reduce [the impact of phase changes]. Figure 8 The receiving device is more likely to receive a poor-quality signal. Furthermore, the modulated signal transmitted from antenna section #A 109_A is more likely to be affected by multipath propagation than the modulated signal transmitted from antenna section #B 109_B, thus increasing the likelihood of obtaining diversity gain. Figure 8 The receiving device can improve the quality of data reception.

[0568] Based on the above reasons, Figure 18 A phase change unit 209A is installed in the middle, and a phase change is performed.

[0569] Among the other symbols 403 and 503 are symbols used for demodulating and decoding the control information symbols, in addition to the control information symbols. These include symbols for signal detection, symbols for frequency and time synchronization, and symbols for channel estimation. Furthermore, in the… Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The frame includes pilot symbols 401 and 501. By utilizing these symbols, it is possible to demodulate and decode the control information symbols with higher accuracy.

[0570] Furthermore, in " Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 In the frame, multiple streams are transmitted via MIMO using data symbols 402 and 502 at the same frequency (band) and time. To demodulate these data symbols, symbols included in other symbols 403 and 503 are used for signal detection, frequency synchronization and time synchronization, and channel estimation.

[0571] At this time, the "other symbols 403 and other symbols 503, including symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation" are phase-changed by the phase-changing unit 209A as previously described.

[0572] In this situation, the processing is not reflected for data symbols 402 and 502 (in the case of the above description, for data symbol 402). When the receiving device demodulates and decodes data symbols 402 and 502, it is necessary to perform demodulation and decoding that reflects the phase change processing performed on the phase change unit 209A. Therefore, the processing is likely to become more complicated.

[0573] This is because the "symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation included in other symbols 403 and other symbols 503" undergo phase changes through the phase change unit 209A.

[0574] However, as Figure 18 As shown, when the phase change unit 209A performs phase change on data symbol 402 and data symbol 502 (in the case of the above description, on data symbol 402), the advantage of the receiving device is that it can easily demodulate and decode data symbol 402 and data symbol 502 using a channel estimation signal (an estimation signal for changes in the transport path). The channel estimation signal is a signal estimated using "symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation contained in other symbols 403 and other symbols 503".

[0575] And, as Figure 18 As shown, when the phase change unit 209A performs phase change on data symbol 402 and data symbol 502 (in the case of the above description, on data symbol 402), the effect of the sharp decrease in electric field strength on the frequency axis in the multipath can be reduced, thereby improving the reception quality of data of data symbol 402 and data symbol 502.

[0576] Thus, the difference between "the object of the symbol for which the phase change unit 205B performs phase change" and "the object of the symbol for which the phase change unit 209A performs phase change" becomes a distinctive feature.

[0577] As shown above, through the Figure 18 The phase-changing unit 205B performs phase changing, thereby improving the reception quality of data symbols 402 and 502, for example, in a receiving device in a LOS environment. Furthermore, by... Figure 18 The phase change unit 209A performs phase change, thereby improving, for example, " Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14The control information symbols contained in the frame are received in the receiving device to improve the reception quality, thus simplifying the demodulation and decoding of data symbols 402 and 502.

[0578] In addition, through the Figure 18 The phase-changing unit 205B performs phase changing, thereby improving the reception quality of data symbols 402 and 502 in the receiving device, for example, in a LOS environment. Furthermore, by... Figure 18 The phase-changing unit 209A performs phase changes on data symbol 402 and data symbol 502, thereby improving the reception quality of data symbol 402 and data symbol 502.

[0579] Furthermore, even if Q in equation (38) is an integer less than or equal to -2, the period of phase change becomes the absolute value of Q. Other implementation methods can also be applied in this regard.

[0580] (Implementation Method 3)

[0581] In this embodiment, compared with embodiment 1 Figure 2 The implementation methods for different configurations will be explained.

[0582] Figure 1 An example of the configuration of a transmission device such as a base station, access point, or broadcasting station in this embodiment is shown. As details have been described in Embodiment 1, they are omitted here.

[0583] The signal processing unit 106 takes the mapped signals 105_1 and 105_2, signal group 110, and control signal 100 as inputs, performs signal processing according to control signal 100, and outputs the processed signals 106_A and 106_B. At this time, the processed signal 106_A is represented as u1(i), and the processed signal 106_B is represented as u2(i). i is the symbol number, for example, i is an integer greater than or equal to 0. Furthermore, for details regarding signal processing, please refer to... Figure 19 Please provide an explanation.

[0584] Figure 19 It shows Figure 1 An example of the configuration of the signal processing unit 106. The weighted synthesis unit (precoding unit) 203 processes the mapped signal 201A ( Figure 1 The mapped signal 105_1), the mapped signal 201B ( Figure 1 The mapped signal 105_2), and the control signal 200 ( Figure 1The control signal 100 is used as input, and the signal is weighted and synthesized (pre-encoded) according to the control signal 200, and the weighted signal 204A and the weighted signal 204B are output.

[0585] At this point, the mapped signal 201A is represented as s1(t), the mapped signal 201B as s2(t), the weighted signal 204A as z1(t), and the weighted signal 204B as z2'(t). Additionally, as an example, t represents time. s1(t), s2(t), z1(t), and z2'(t) are defined by complex numbers, and therefore can also be real numbers.

[0586] Here, although the processing is performed as a function of time, it could also be a function of "frequency (carrier number)", or a function of "time and frequency". Furthermore, it could be a function of "symbol number". This is also the same as in Implementation Method 1.

[0587] The weighted synthesis unit (precoding unit) 203 performs the operation of equation (1).

[0588] Furthermore, the phase-changing unit 205B takes the weighted synthesized signal 204B and the control signal 200 as inputs, performs phase-changing on the weighted synthesized signal 204B according to the control signal 200, and outputs the phase-changed signal 206B. The phase-changed signal 206B is represented as z2(t), where z2(t) is defined by a complex number, but can also be a real number.

[0589] The specific operation of the phase-changing unit 205B will be explained. In the phase-changing unit 205B, for example, a phase change of y(i) is performed for z2'(i). Therefore, it can be expressed as z2(i) = y(i) × z2'(i). i is the symbol number, and i is an integer greater than or equal to 0.

[0590] For example, the value of the phase change can be set as shown in equation (2). N is an integer greater than or equal to 2, and N is the period of the phase change. If N is set to an odd number greater than or equal to 3, it may improve the data reception quality. However, equation (2) is only an example and is not a limitation. Therefore, the phase change value y(i) = e j×δ(i) To express.

[0591] At this point, z1(i) and z2(i) can be represented by equation (3). Furthermore, δ(i) is a real number. Also, z1(i) and z2(i) are transmitted from the transmitting device at the same time and at the same frequency (same frequency band). In equation (3), the value of the phase change is not limited to equation (2); for example, a periodic, regular method of phase change can be considered.

[0592] Furthermore, as explained in Embodiment 1, the (precoding) matrix in Equations (1) and (3) can be derived from Equations (5) to (36). However, the precoding matrix is ​​not limited to this, and the same applies to Embodiment 1.

[0593] The insertion unit 207A takes the weighted synthesized signal 204A, pilot symbol signal pa(t) 251A, preamble signal 252, control information symbol signal 253, and control signal 200 as inputs, and outputs a baseband signal 208A based on the frame composition information contained in the control signal 200. t represents time.

[0594] Similarly, the insertion unit 207B takes the phase-changed signal 206B, the pilot symbol signal pb(t) 251B, the preamble signal 252, the control information symbol signal 253, and the control signal 200 as inputs, and outputs the baseband signal 208B based on the frame composition information contained in the control signal 200.

[0595] The phase-changing unit 209A takes the baseband signal 208A and the control signal 200 as inputs. It performs phase-changing on the baseband signal 208A according to the control signal 200 and outputs the phase-changed signal 210A. The baseband signal 208A is set as a function of symbol number i, denoted as x'(i). Thus, the phase-changed signal 210A(x(i)) is represented as x(i) = e j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[0596] Furthermore, as described in Embodiment 1, the operation of the phase-changing unit 209A can also be the CDD / CSD described in Non-Patent Documents 2 and 3. Moreover, the phase-changing unit 209A performs phase changes on symbols existing in the frequency axis direction. That is, the phase-changing unit 209A performs phase changes on data symbols, pilot symbols, control information symbols, etc.

[0597] The phase-changing unit 209B takes the baseband signal 208B and the control signal 200 as inputs. It performs phase-changing on the baseband signal 208B according to the control signal 200 and outputs the phase-changed signal 210B. The baseband signal 208B is set as a function of symbol number i, represented as y'(i). Thus, the phase-changed signal 210B(y(i)) is represented as y(i) = e j×τ(i) ×y'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[0598] Furthermore, as described in Embodiment 1, the operation of the phase-changing unit 209B can also be the CDD / CSD described in Non-Patent Documents 2 and 3. Moreover, the phase-changing unit 209B performs phase changes on symbols present in the frequency axis direction. That is, the phase-changing unit 209B performs phase changes on data symbols, pilot symbols, control information symbols, etc.

[0599] The key feature here is that the phase change method via ε(i) is different from the phase change method via τ(i). Alternatively, the value of the CDD / CSD cycle delay set in the phase change unit 209A is different from the value of the CDD / CSD cycle delay set in the phase change unit 209B.

[0600] Figure 3 It shows Figure 1 An example of the configuration of the wireless units 107_A and 107_B is provided, and the description is omitted here as it has been described in detail in Embodiment 1.

[0601] Figure 4 It shows Figure 1 The frame structure of the transmitted signal 108_A is described in detail in Embodiment 1, so the description is omitted here.

[0602] Figure 5 It shows Figure 1 The frame structure of the transmission signal 108_B is described in detail in Embodiment 1, so the description is omitted here.

[0603] exist Figure 4 The carrier A, the time $B contains the code element, and in Figure 5 When carrier A and time B contain code elements, Figure 4 The code elements of carrier A and time B are Figure 5 The symbols of carrier A and time B are transmitted at the same time and frequency. Furthermore, regarding frame composition, it is not affected by... Figure 4 , Figure 5 limited, Figure 4 and Figure 5 This is just one example of what a frame is made of.

[0604] and, Figure 4 and Figure 5 The other code elements in the text are equivalent to " Figure 2 The code elements of "preamble signal 252" and "control information code element signal 253" are therefore, in conjunction with... Figure 4 The other code elements 403 are from the same time and at the same frequency (same carrier). Figure 5 In the case of other code elements 503 transmitting control information, the same data (the same control information) is transmitted.

[0605] In addition, although it is envisioned that the receiving device will... Figure 4 frames and Figure 5 Frames are received simultaneously, even during reception Figure 4 frames or Figure 5 In the case of frames, the receiving device can also obtain the data sent by the transmitting device.

[0606] Figure 6 It shows the method used to generate Figure 2 An example of the configuration of the part related to the generation of control information signal 253 is provided, but since it has been described in detail in Embodiment 1, the description is omitted here.

[0607] Figure 7 It shows Figure 1 An example of the configuration of antenna section #A 109_A and antenna section #B 109_B is an example of antenna section #A 109_A and antenna section #B 109_B being composed of multiple antennas. Figure 7 The example shown is described in detail in Implementation 1, so the description is omitted.

[0608] Figure 8 It shows Figure 1 The transmitting device, for example, in transmitting Figure 4 , Figure 5 An example of the configuration of a receiving device that receives a modulated signal when a transmission signal is composed of frames is provided. Since the description has been described in detail in Embodiment 1, the description is omitted here.

[0609] Figure 10 It shows Figure 8 An example of the configuration of antenna section #X 801X and antenna section #Y 801Y. Figure 10 This is an example where antenna section #X 801X and antenna section #Y 801Y are composed of multiple antennas. Because... Figure 10 As described in detail in Implementation 1, the description is omitted here.

[0610] then, Figure 1 The signal processing unit 106 of the transmitting device shown in the diagram, in Figure 19 Phase change unit 205B and phase change units 209A and 209B are inserted. Their features and effects are explained.

[0611] Such as using Figure 4 , Figure 5As described, precoding (weighted synthesis) is performed on the mapped signal s1(i)201A obtained by mapping using the first series and the mapped signal s2(i)201B obtained by mapping using the second series. A phase shift is then performed on one of the weighted synthesized signals 204A and 204B, and this operation is performed by the phase shifting unit 205B. i is the symbol number, and i is an integer greater than or equal to 0.

[0612] Furthermore, the weighted combined signal 204A and the phase-changed signal 206B are transmitted at the same frequency and at the same time. Therefore, in Figure 4 , Figure 5 In China, Figure 5 The data symbol 502 undergoes a phase change. Figure 19 In this context, since the phase-changing unit 205 targets the weighted and synthesized signal 204B, therefore, for Figure 5 The data symbol 502 undergoes a phase change. When performing a phase change on the weighted synthesized signal 204A, the... Figure 4 The data symbol 402 undergoes a phase change. This will be explained later.

[0613] For example, Figure 11 What is shown is for Figure 5 From the frames, extract carriers 1 to 5, and time intervals $4 to $6. Additionally, Figure 11 and Figure 5 Similarly, pilot symbol 501, data symbol 502, and other symbols 503 are shown.

[0614] As mentioned above, in Figure 11 In the symbols shown, the phase change unit 205B performs phase changes on the data symbols in (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6).

[0615] Therefore, it will target Figure 11 The phase change value of the data symbol shown is set as follows: at (carrier 1, time $5), it is set to "e". j×δ15(i) “”, set to “e” in (carrier 2, time $5) j×δ25(i) “”, set to “e” in (carrier 3, time $5) j ×δ35(i) “”, set to “e” in (carrier 4, time $5) j×δ45(i) “”, set to “e” in (carrier 5, time $5) j×δ55(i) “”, set to “e” in (carrier 1, time $6)j×δ16(i) “”, set to “e” in (carrier 2, time $6) j×δ26(i) “”, set to “e” in (carrier 4, time $6) j×δ46(i) “”, set to “e” in (carrier 5, time $6) j×δ56(i) ".

[0616] Furthermore, in Figure 11 Among the symbols shown, the other symbols in (carrier 1, time $4), (carrier 2, time $4), (carrier 3, time $4), (carrier 4, time $4), and (carrier 5, time $4), and the pilot symbols in (carrier 3, time $6), are not the targets of phase change by the phase change unit 205B.

[0617] This is a characteristic of the phase change unit 205B. Furthermore, in relation to... Figure 11 The data symbols in the phase-change objects (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are "the same carrier, the same time", such as Figure 4 Configure the data carrier as shown.

[0618] That is, in Figure 4 In the diagram, (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are data symbols.

[0619] That is, the symbols used for MIMO transmission, that is, the data symbols used to transmit multiple streams, are the targets of phase change by the phase change unit 205B.

[0620] Furthermore, as an example of the phase-changing unit 205B performing phase changes on data symbols, as shown in equation (2), there is a method for performing regular phase changes on data symbols, such as a method for performing phase changes with a period of N. However, the method for performing phase changes on data symbols is not limited to this.

[0621] The result is that, in environments dominated by direct light waves, such as LOS environments, the reception quality of data transmitted via MIMO (Multiple Streams of Data) is improved in the receiving device. This effect will be explained below.

[0622] For example, Figure 1 The modulation scheme used by the mapping unit 104 is QPSK. Figure 19 The mapped signal 201A is a QPSK signal, and the mapped signal 201B also becomes a QPSK signal. That is, two QPSK streams are sent.

[0623] Thus, in Figure 8 In the signal processing unit 811, for example, channel estimation signals 806_1 and 806_2 are used to obtain 16 candidate signal points. QPSK transmits 2 bits, and since there are two streams, a total of 4 bits are transmitted. Thus, there are 2... 4 = 16 candidate signal points.

[0624] In addition, although 16 other candidate signal points can be obtained using channel estimation signals 808_1 and 808_2, since the explanation is the same, the focus will be on explaining how to generate 16 candidate signal points using channel estimation signals 806_1 and 806_2.

[0625] An example of this state is given by Figure 12 A, Figure 12 Figure B shows the diagram. In both figures, the horizontal axis represents in-phase I, and the vertical axis represents orthogonal Q. In the in-phase I-orthogonal Q plane, there are 16 candidate signal points. Among these 16 candidate signal points, one is the signal point transmitted by the transmitting device. Therefore, they are referred to as "16 candidate signal points".

[0626] In environments dominated by direct waves, such as LOS environments, as the first case, it is possible to consider "in Figure 19 In the case where the phase change unit 205B is absent, that is... Figure 19 The phase change unit 205B does not perform phase change.

[0627] In the "first scenario," since no phase change occurs, there is a risk of getting trapped. Figure 12 The possibilities of the state shown in A. In the case of falling into... Figure 12 In state A, as shown in "signal points 1201 and 1202", "signal points 1203, 1204, 1205, 1206", and "signal points 1207 and 1208", due to the presence of densely packed signal points, therefore... Figure 8 In the receiving device, the quality of data reception may be reduced.

[0628] To overcome this phenomenon, Figure 19 A phase-changing unit 205B is inserted. If the phase-changing unit 205B is inserted, since the symbol number i, there exists Figure 12 The symbol number of the "dense signal point area" shown in A, and its existence Figure 12As shown in B, the symbol numbering is mixed up due to the large distance between signal points. To address this situation, by introducing error-correcting codes, a high error-correction capability can be achieved. Figure 8 The receiving device is capable of achieving high data reception quality.

[0629] In addition, Figure 19 For the "pilot symbols and preambles" used in channel estimation for data symbols such as demodulation (detection) pilot symbols and preambles, in Figure 19 The phase-changing unit 205B does not perform phase changing. Therefore, in data symbols, "due to symbol number i, thus..." Figure 12 The symbol number of the "dense signal point area" shown in A, and its existence Figure 12 The symbol numbering shown in B, which indicates "large distance between signal points", is mixed up.

[0630] However, regarding the "pilot symbols and preamble" used for channel estimation of data symbols such as demodulation (detection) pilot symbols and preambles, even... Figure 19 When the phase-changing unit 205B performs a phase change, the following situation may also occur: "When the data symbol can achieve "due to symbol number i, there exists..." Figure 12 The symbol number of the "dense signal point area" shown in A, and... Figure 12 B illustrates the mixing of symbol numbers where "the distance between signal points is large".

[0631] In this case, certain conditions need to be added to perform phase changes on the pilot symbols and preamble. For example, one possible approach is to set a different rule than the one for phase changes on the data symbols: "Perform phase changes on the pilot symbols and / or preamble." As an example, one method is to perform regular phase changes with a period of N on the data symbols, and regular phase changes with a period of M on the pilot symbols and / or preamble. N and M are integers greater than or equal to 2.

[0632] As described above, the phase-changing unit 209A takes the baseband signal 208A and the control signal 200 as inputs, performs phase changing on the baseband signal 208A based on the control signal 200, and outputs the phase-changed signal 210A. The baseband signal 208A is set as a function of symbol number i, denoted as x'(i). Thus, the phase-changed signal 210A(x(i)) can be expressed as x(i) = e j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[0633] Furthermore, the phase-changing unit 209A can operate as a CDD / CSD as described in Non-Patent Documents 2 and 3. The phase-changing unit 209A performs phase changes on symbols present in the frequency axis direction. The phase-changing unit 209A performs phase changes on data symbols, pilot symbols, control information symbols, etc. Therefore, in this case, the symbol that becomes the object of symbol number i becomes a data symbol, pilot symbol, control information symbol, preamble (other symbols), etc.

[0634] exist Figure 19 In this case, since the phase change unit 209A performs phase change on the baseband signal 208A, therefore, for Figure 4 The recorded symbols undergo phase changes.

[0635] Therefore, in Figure 4 In the frame, for time $1, all the symbols of all carriers (other symbols 403) are... Figure 19 The phase change unit 209A performs phase change.

[0636] same, Figure 19 The phase-changing unit 209A performs phase changes for the following symbols:

[0637] "All symbols of all carriers at time $2 (other symbols 403)"

[0638] "All symbols of all carriers at time $3 (other symbols 403)"

[0639] "All symbols of all carriers at time $4 (other symbols 403)"

[0640] "All symbols of all carriers at time $5 (pilot symbol 401 or data symbol 402)".

[0641] "All symbols of all carriers at time $6 (pilot symbol 401 or data symbol 402)".

[0642] "All symbols of all carriers at time $7 (pilot symbol 401 or data symbol 402)".

[0643] "All symbols of all carriers at time $8 (pilot symbol 401 or data symbol 402)".

[0644] "All symbols of all carriers at time $9 (pilot symbol 401 or data symbol 402)".

[0645] "All symbols of all carriers at time $10 (pilot symbol 401 or data symbol 402)".

[0646] "All symbols of all carriers at time $11 (pilot symbol 401 or data symbol 402)," omitting the records of carriers at other times.

[0647] As described above, the phase-changing unit 209B takes the baseband signal 208B and the control signal 200 as inputs, performs phase changing on the baseband signal 208B based on the control signal 200, and outputs the phase-changed signal 210B. The baseband signal 208B is used as a function of symbol number i, represented as y'(i). Thus, the phase-changed signal y(i)210B is represented as y(i)=e j×τ(i) ×y'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[0648] Furthermore, the operation of the phase-changing unit 209B can also be that of the CDD / CSD described in Non-Patent Documents 2 and 3. The phase-changing unit 209B performs phase changes on symbols existing in the frequency axis direction. The phase-changing unit 209B performs phase changes on data symbols, pilot symbols, control information symbols, etc.

[0649] Therefore, in this case, the symbol that becomes the object with symbol number i is a data symbol, pilot symbol, control information symbol, preamble (other symbols), etc. Figure 19 In this case, since the phase change unit 209B performs phase change on the baseband signal 208B, therefore... Figure 5 The recorded symbols undergo phase changes.

[0650] Therefore, in Figure 5 In the frame, for time $1, all the symbols of all carriers (other symbols 503) are... Figure 19 The phase change unit 209B performs phase change.

[0651] same, Figure 19 The phase-changing unit 209B performs phase changes for the following symbols:

[0652] "All symbols of all carriers at time $2 (other symbols 503)"

[0653] "All symbols of all carriers at time $3 (other symbols 503)"

[0654] "All symbols of all carriers at time $4 (other symbols 503)"

[0655] "All symbols of all carriers at time $5 (pilot symbol 501 or data symbol 502)".

[0656] "All symbols of all carriers at time $6 (pilot symbol 501 or data symbol 502)".

[0657] "All symbols of all carriers at time $7 (pilot symbol 501 or data symbol 502)"

[0658] "All symbols of all carriers at time $8 (pilot symbol 501 or data symbol 502)"

[0659] "All symbols of all carriers at time $9 (pilot symbol 501 or data symbol 502)".

[0660] "All symbols of all carriers at time $10 (pilot symbol 501 or data symbol 502)"

[0661] "All symbols of all carriers at time $11 (pilot symbol 501 or data symbol 502)," omitting records of other times and carriers.

[0662] Figure 13 It shows Figure 1 The transmission signal 108_A and Figure 4 The different frame configurations are described in detail in Implementation 1, so the description is omitted here.

[0663] Figure 14 It shows Figure 1 The transmission signal 108_B and Figure 5 The different frame configurations are described in detail in Implementation 1, so the description is omitted here.

[0664] exist Figure 13 The carrier A and time B contain code elements. Figure 14 When carrier A and time B contain code elements, Figure 13 The code elements of carrier A and time B are Figure 14 The symbols of carrier A and time B are transmitted at the same time and frequency. Additionally, Figure 13 , Figure 14 The frame structure shown is just one example.

[0665] and, Figure 13 , Figure 14 The other code elements in the text are equivalent to " Figure 19 The code elements of "preamble signal 252" and "control information code element signal 253" are therefore, in conjunction with... Figure 13 The other code elements 403 are from the same time and at the same frequency (same carrier). Figure 14 Other code elements 503, when transmitting control information, transmit the same data (the same control information).

[0666] In addition, although the idea is Figure 13 Frames and Figure 14 The frames are received simultaneously by the receiving device, even if the receiving device receives Figure 13 frames or Figure 14 The receiving device can also receive the data sent by the transmitting device from the frame.

[0667] The phase-changing unit 209A takes the baseband signal 208A and the control signal 200 as inputs, performs phase changing on the baseband signal 208A based on the control signal 200, and outputs the phase-changed signal 210A. The baseband signal 208A is set as a function of symbol number i, denoted as x'(i). Thus, the phase-changed signal 210A(x(i)) is represented as x(i) = e j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[0668] Furthermore, the phase-changing unit 209A can operate as a CDD / CSD as described in Non-Patent Documents 2 and 3. The phase-changing unit 209A performs phase changes on symbols existing in the frequency axis direction. The phase-changing unit 209A performs phase changes on data symbols, pilot symbols, control information symbols, etc. At this time, it is possible to consider that the null character is also an object of phase change. Therefore, in this case, the symbols that become the object of symbol number i are data symbols, pilot symbols, control information symbols, preambles (other symbols), null characters, etc.

[0669] However, even if a phase shift is applied to the null character, the signal before the phase shift is the same as the signal after the phase shift. This is because the null character has zero in-phase component I (0) and zero quadrature component Q (0). Therefore, the null character can be interpreted as not being the object of a phase shift.

[0670] exist Figure 19 In this case, since the phase change unit 209A performs phase change on the baseband signal 208A, therefore for Figure 13 The recorded symbols undergo phase changes.

[0671] Therefore, in Figure 13 In the frame, for time $1, all the symbols of all carriers (other symbols 403) are... Figure 19 The phase change unit 209A performs the phase change. However, the processing of the phase change of the null character 1301 is as described above.

[0672] same, Figure 19 The phase-changing unit 209A performs phase changes on the following symbols.

[0673] "All symbols of all carriers at time $2 (other symbols 403)"

[0674] "All symbols of all carriers at time $3 (other symbols 403)"

[0675] "All symbols of all carriers at time $4 (other symbols 403)"

[0676] "All symbols of all carriers at time $5 (pilot symbol 401 or data symbol 402)".

[0677] "All symbols of all carriers at time $6 (pilot symbol 401 or data symbol 402)".

[0678] "All symbols of all carriers at time $7 (pilot symbol 401 or data symbol 402)".

[0679] "All symbols of all carriers at time $8 (pilot symbol 401 or data symbol 402)".

[0680] "All symbols of all carriers at time $9 (pilot symbol 401 or data symbol 402)".

[0681] "All symbols of all carriers at time $10 (pilot symbol 401 or data symbol 402)".

[0682] "All symbols (pilot symbol 401 or data symbol 402) of all carriers at time $11", however, the phase change of the null character 1301 is handled in the same way as described above for all times and all carriers. Descriptions of times and carriers other than those mentioned above are omitted.

[0683] The phase change value in the phase change unit 209A is represented as Ω(i). The baseband signal 208A is x'(i), and the phase-changed signal 210A is x(i). Therefore, x(i) = Ω(i) × x'(i) holds true.

[0684] For example, the value of the phase change can be set as in equation (38). Q is an integer greater than or equal to 2, and Q is the period of the phase change. j is the imaginary unit. However, equation (38) is only an example and is not a limitation.

[0685] For example, Ω(i) can be set in a way that uses a periodic Q to perform phase changes.

[0686] And, for example, in Figure 4 , Figure 13 In this context, while assigning the same phase change value to the same carrier, the phase change value can be set for each carrier individually. For example, it can be shown below.

[0687] ·against Figure 4 , Figure 13 In carrier 1, the phase change value is set as in equation (39) in a way that is independent of time.

[0688] ·against Figure 4 , Figure 13 The carrier 2 in the middle sets the phase change value as Equation (40) in a way that is independent of time.

[0689] ·against Figure 4 , Figure 13 The carrier 3 in the middle sets the phase change value as Equation (41) in a way that is independent of time.

[0690] ·against Figure 4 , Figure 13 The carrier 4 in the middle sets the phase change value as Equation (42) in a way that is independent of time.

[0691] Records of carriers other than those mentioned above are omitted.

[0692] The above is Figure 19 Example of operation of phase change unit 209A.

[0693] The phase-changing unit 209B takes the baseband signal 208B and the control signal 200 as inputs, performs phase-changing on the baseband signal 208B based on the control signal 200, and outputs the phase-changed signal 210B. The baseband signal 208B is set as a function of symbol number i, represented as y'(i). Thus, the phase-changed signal 210B(y(i)) can be expressed as y(i) = e j ×τ(i) ×y'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[0694] Furthermore, the phase-changing unit 209B can operate as a CDD / CSD as described in Non-Patent Documents 2 and 3. The phase-changing unit 209B performs phase changes on symbols present in the frequency axis direction. The phase-changing unit 209B performs phase changes on data symbols, pilot symbols, control information symbols, etc. At this time, the null character can also be considered as an object of phase change.

[0695] Therefore, in this case, the code elements that become the object with code element number i are data code elements, pilot code elements, control information code elements, preamble (other code elements), null characters, etc.

[0696] Since the empty character has zero in-phase component I (0) and zero quadrature component Q (0), even if a phase shift is performed on the empty character, the signal before the phase shift is the same as the signal after the phase shift. Therefore, the empty character can be interpreted as not being the object of phase shift.

[0697] exist Figure 19 In this case, since the phase change unit 209B performs phase change on the baseband signal 208B, therefore for Figure 14 The recorded symbols undergo phase changes.

[0698] Thus, in Figure 14 In the frame, for time $1, all the symbols of all carriers (other symbols 503) are... Figure 19 The phase change unit 209B performs the phase change. However, the phase change processing for the null character 1301 is the same as described previously.

[0699] same, Figure 19 The phase-changing unit 209B performs phase changes on the following symbols:

[0700] "All symbols of all carriers at time $2 (other symbols 503)"

[0701] "All symbols of all carriers at time $3 (other symbols 503)"

[0702] "All symbols of all carriers at time $4 (other symbols 503)"

[0703] "All symbols of all carriers at time $5 (pilot symbol 501 or data symbol 502)".

[0704] "All symbols of all carriers at time $6 (pilot symbol 501 or data symbol 502)".

[0705] "All symbols of all carriers at time $7 (pilot symbol 501 or data symbol 502)"

[0706] "All symbols of all carriers at time $8 (pilot symbol 501 or data symbol 502)"

[0707] "All symbols of all carriers at time $9 (pilot symbol 501 or data symbol 502)".

[0708] "All symbols of all carriers at time $10 (pilot symbol 501 or data symbol 502)"

[0709] "All symbols (pilot symbol 501 or data symbol 502) of all carriers at time $11", however, the explanation of the phase change of the null character 1301 for all times and all carriers is the same as the explanations before this. Records concerning times and carriers other than those mentioned above are omitted.

[0710] The phase change value in the phase change unit 209B is represented as Ω(i). The baseband signal 208B is y'(i), and the phase-changed signal 210B is y(i). Therefore, y(i) = Δ(i) × y'(i) holds true.

[0711] For example, the value of the phase change can be set as follows. R is an integer greater than or equal to 2, and R is the period of the phase change. In addition, the values ​​of Q and R in equation (38) can be different.

[0712] [Formula 49]

[0713]

[0714] j is the imaginary unit. However, equation (49) is only an example and is not limited to it.

[0715] For example, Δ(i) could be set in a way that uses a period R to perform phase changes.

[0716] Furthermore, the phase changing methods of phase changing unit 209A and phase changing unit 209B are different. For example, the periods can be the same or different.

[0717] And, for example, it could be, in Figure 5 , Figure 14 In this approach, the same phase change value is assigned to the same carrier, while the phase change value is set according to each carrier. For example, it becomes as shown below.

[0718] ·against Figure 5 , Figure 14 In carrier 1, the phase change value is set as in equation (39) in a way that is independent of time.

[0719] ·against Figure 5 , Figure 14 The carrier 2 in the middle sets the phase change value as Equation (40) in a way that is independent of time.

[0720] ·against Figure 5 , Figure 14 The carrier 3 in the middle sets the phase change value as Equation (41) in a way that is independent of time.

[0721] ·against Figure 5 , Figure 14The carrier 4 in the middle sets the phase change value as Equation (42) in a way that is independent of time.

[0722] Records related to carriers other than those mentioned above are omitted.

[0723] Although the phase change values ​​are described by equations (39), (40), (41), and (42), the phase change methods of phase change unit 209A and phase change unit 209B are different.

[0724] The above is Figure 19 Example of operation of phase change unit 209B.

[0725] To Figure 19 The effects obtained by the phase change units 209A and 209B will be explained.

[0726] exist" Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The other code elements 403 and 503 of the "frame" include control information code elements. As previously mentioned, in the same time and at the same frequency (same carrier) as other code elements 403, Figure 5 In the case of other code elements 503 transmitting control information, the same data (the same control information) is sent.

[0727] However, as in scenario 2, it can be considered that "control information code elements, through..." Figure 1 The antenna section #A 109_A or antenna section #B 109_B is used to transmit.

[0728] In the transmission scenario shown in "Case 2", since the number of antennas transmitting control information symbols is 1, compared to the case of "using both antennas #A 109_A and antennas #B 109_B to transmit control information symbols", the spatial diversity gain is smaller. Therefore, in "Case 2", even... Figure 8 If the receiving device receives the data, the data reception quality will be reduced. Therefore, from the perspective of improving data reception quality, it is preferable to "use both antenna sections #A 109_A and #B 109_B to transmit control information symbols".

[0729] As in scenario 3, it is possible to consider "transmitting control information code elements through..." Figure 1 The antenna section #A 109_A and the antenna section #B 109_B transmit from both sides. However, Figure 19 The phase change units 209A and 209B in the middle do not perform phase change.

[0730] In the transmission case shown in "Case 3", since the modulation signal transmitted from antenna section #A109_A is the same as or offset by a specific phase from the modulation signal transmitted from antenna section #B109_B, due to the propagation environment of the radio waves, Figure 8 The receiving device may receive a very poor quality signal, and both modulated signals may be affected by the same multipath propagation. Therefore, in Figure 8 In the receiving device, there will be a phenomenon of reduced data reception quality.

[0731] To mitigate this phenomenon, Figure 19 Phase changing units 209A and 209B are provided. Therefore, since the phase is changed in the time or frequency direction, the efficiency of the circuit can be reduced. Figure 8 The receiving device is likely to receive a poor-quality received signal. Furthermore, since the multipath effects experienced by the modulated signal transmitted from antenna section #A109_A are likely to differ from those experienced by the modulated signal transmitted from antenna section #B109_B, the likelihood of obtaining diversity gain is high. Figure 8 The receiving device can improve the quality of data reception.

[0732] Based on the above reasons, Figure 19 Phase change units 209A and 209B are installed to perform phase changes.

[0733] Other symbols 403 and 503 include symbols other than control information symbols used for demodulating and decoding control information symbols, such as symbols for signal detection, symbols for frequency and time synchronization, and symbols for channel estimation. Furthermore, in the context of… Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The frame includes pilot symbols 401 and 501. By utilizing these symbols, the control information symbols can be demodulated and decoded with higher accuracy.

[0734] Furthermore, in " Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 In the frame, multiple streams are transmitted at the same frequency (band) and time using data symbols 402 and 502, i.e., MIMO transmission is performed. In order to demodulate these data symbols, symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation are included in other symbols 403 and 503.

[0735] At this time, the "symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation included in other symbols 403 and other symbols 503" are phase-changed by the phase-changing units 209A and 209B as previously described.

[0736] In this situation, if the processing is not reflected in data symbols 402 and 502, and the receiving device demodulates and decodes data symbols 402 and 502, it would be necessary to perform demodulation and decoding that reflects the phase change processing performed by phase change units 209A and 209B, which could easily complicate the process. This is because the phase change of symbols included in other symbols 403 and 503 for signal detection, frequency synchronization, time synchronization, and channel estimation is performed by phase change units 209A and 209B.

[0737] However, as Figure 19 As shown, when the phase change units 209A and 209B perform phase changes on data symbols 402 and 502, the receiving device has the advantage that it can easily demodulate and decode data symbols 402 and 502 by using the channel estimation signal (the estimated signal of the transport path variation) estimated by "symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation included in other symbols 403 and other symbols 503".

[0738] In addition, such as Figure 19 As shown, when the phase change units 209A and 209B perform phase change on data symbol 402 and data symbol 502, the effect of the sharp decrease in electric field strength on the frequency axis in the multipath can be reduced, thereby improving the reception quality of data symbol 402 and data symbol 502.

[0739] Thus, the difference between "the object of the symbol for which the phase change unit 205B performs phase change" and "the object of the symbol for which the phase change units 209A and 209B perform phase change" is the feature point.

[0740] As described above, through the Figure 19 The phase-changing unit 205B performs phase changing, thereby improving the reception quality of data symbols 402 and 502 in the receiving device, for example, in a LOS environment. Figure 19 The phase-changing units 209A and 209B perform phase changes, for example, to improve the " Figure 4 as well as Figure 5"frame" or " Figure 13 as well as Figure 14 The control information symbols contained in the frame improve the reception quality in the receiving device and simplify the demodulation and decoding of data symbols 402 and 502.

[0741] In addition, through the Figure 19 The phase-changing unit 205B performs phase changing, which can improve the reception quality of data symbols 402 and 502 in the receiving device, for example, in a LOS environment. Furthermore, through... Figure 19 The phase-changing units 209A and 209B perform phase changes on data symbol 402 and data symbol 502, thereby improving the reception quality of data symbol 402 and data symbol 502.

[0742] Furthermore, Q in equation (38) can be an integer less than -2, in which case the period of phase change is the absolute value of Q. This also applies to implementation method 1.

[0743] Furthermore, R in equation (49) can be an integer less than -2, in which case the period of phase change is the absolute value of R.

[0744] Furthermore, considering the content explained in Supplement 1, the circulation delay amount set in the phase change unit 209A can be different from the circulation delay amount set in the phase change unit 209B.

[0745] (Implementation Method 4)

[0746] In this embodiment, compared with embodiment 1 Figure 2 The implementation methods for different configurations will be explained.

[0747] Figure 1 An example of the configuration of a transmission device such as a base station, access point, or broadcasting station in this embodiment is shown. Since the detailed description is the same as that in Embodiment 1, it is omitted here.

[0748] The signal processing unit 106 takes the mapped signals 105_1 and 105_2, signal group 110, and control signal 100 as inputs, performs signal processing according to control signal 100, and outputs the processed signals 106_A and 106_B. At this time, the processed signal 106_A is represented as u1(i), and the processed signal 106_B is represented as u2(i). i is the symbol number; for example, i is an integer greater than or equal to 0. Furthermore, details regarding signal processing will be provided using... Figure 20 Let me explain.

[0749] Figure 20 It shows Figure 1 An example of the configuration of the signal processing unit 106. The weighted synthesis unit (precoding unit) 203 processes the mapped signal 201A ( Figure 1 The mapped signal 105_1), the mapped signal 201B ( Figure 1 The mapped signal 105_2), control signal 200 ( Figure 1 The control signal 100 is used as input, and the signal is weighted and synthesized (pre-encoded) according to the control signal 200, and the weighted signal 204A and the weighted signal 204B are output.

[0750] At this point, the mapped signal 201A is represented as s1(t), the mapped signal 201B as s2(t), the weighted signal 204A as z1'(t), and the weighted signal 204B as z2'(t). Additionally, as an example, t represents time. s1(t), s2(t), z1'(t), and z2'(t) are defined by complex numbers, and therefore can also be real numbers.

[0751] Here, although it is processed as a function of time, it could also be a function of "frequency (carrier number)", or it could be a function of "time and frequency". Furthermore, it could be a function of "symbol number". This is the same as in Implementation Method 1.

[0752] The weighted synthesis unit (precoding unit) 203 performs the following calculations.

[0753] [Formula 50]

[0754]

[0755] Furthermore, the phase-changing unit 205A takes the weighted synthesized signal 204A and the control signal 200 as inputs, performs phase-changing on the weighted synthesized signal 204A according to the control signal 200, and outputs the phase-changed signal 206A. Additionally, the phase-changed signal 206A is represented by z1(t), where z1(t) is defined as a complex number, but can also be a real number.

[0756] The specific operation of the phase-changing unit 205A will be explained. In the phase-changing unit 205A, for example, a phase change of w(i) is performed on z1'(i). Therefore, it can be expressed as z1(i) = w(i) × z1'(i). i is the symbol number, and i is an integer greater than or equal to 0.

[0757] For example, the value for phase change can be set as follows.

[0758] [Formula 51]

[0759]

[0760] M is an integer greater than or equal to 2, and M is the period of phase change. Setting M to an odd number greater than or equal to 3 may improve data reception quality. However, equation (51) is merely an example and is not a limitation. Therefore, with the phase change value w(i) = e j ×λ(i) To express.

[0761] Furthermore, the phase-changing unit 205B takes the weighted synthesized signal 204B and the control signal 200 as inputs, performs phase-changing on the weighted synthesized signal 204B according to the control signal 200, and outputs the phase-changed signal 206B. Additionally, the phase-changed signal 206B is represented by z2(t), which is defined by a complex number, but can also be a real number.

[0762] The specific operation of the phase-changing unit 205B will be explained. In the phase-changing unit 205B, for example, a phase change of y(i) is performed for z2'(i). Therefore, it can be expressed as z2(i) = y(i) × z2'(i). i is the symbol number, and i is an integer greater than or equal to 0.

[0763] For example, the phase change value can be set as shown in equation (2). N is an integer greater than or equal to 2, and N is the period of the phase change. N ≠ M. If N is set to an odd number greater than or equal to 3, there is a possibility of improving the data reception quality. However, equation (2) is only an example and is not a limitation. Therefore, the phase change value y(i) = e j×δ(i) To express.

[0764] At this point, z1(i) and z2(i) can be represented by the following formula.

[0765] [Formula 52]

[0766]

[0767] Furthermore, δ(i) and λ(i) are real numbers. Also, z1(i) and z2(i) are transmitted from the transmitting device at the same time and at the same frequency (same frequency band). In equation (52), the value of the phase change is not limited by equations (2) and (52); for example, a method of periodic, regular phase changes can be considered.

[0768] Furthermore, as explained in Embodiment 1, the (precoding) matrix in equations (50) and (52) can be derived from equations (5) to (36), etc. However, the precoding matrix is ​​not limited to this, and the same applies to Embodiment 1.

[0769] The insertion unit 207A takes the weighted synthesized signal 204A, pilot symbol signal pa(t) 251A, preamble signal 252, control information symbol signal 253, and control signal 200 as inputs, and outputs a baseband signal 208A based on the frame composition information contained in the control signal 200. t represents time.

[0770] Similarly, the insertion unit 207B takes the phase-changed signal 206B, the pilot symbol signal pb(t) 251B, the preamble signal 252, the control information symbol signal 253, and the control signal 200 as inputs, and outputs the baseband signal 208B based on the frame composition information contained in the control signal 200.

[0771] The phase-changing unit 209B takes the baseband signal 208B and the control signal 200 as inputs. It performs phase-changing on the baseband signal 208B according to the control signal 200, and outputs the phase-changed signal 210B. The baseband signal 208B is used as a function of symbol number i, represented as x'(i). Thus, the phase-changed signal x(i)210B can be expressed as x(i) = e^(i-1) / 2. j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[0772] Furthermore, as described in Embodiment 1, the phase-changing unit 209B can operate as a CDD / CSD as described in Non-Patent Documents 2 and 3. The phase-changing unit 209B performs phase changes on symbols present in the frequency axis direction. The phase-changing unit 209B performs phase changes on data symbols, pilot symbols, control information symbols, etc.

[0773] Figure 3 It shows Figure 1 An example of the configuration of the wireless units 107_A and 107_B is provided, and the description is omitted here as it has been described in detail in Embodiment 1.

[0774] Figure 4 It shows Figure 1 The frame structure of the transmitted signal 108_A is described in detail in Embodiment 1, so the description is omitted here.

[0775] Figure 5 It shows Figure 1 The frame structure of the transmission signal 108_B is described in detail in Embodiment 1, so the description is omitted here.

[0776] exist Figure 4 The carrier A, the time $B contains the code element, and in Figure 5 When carrier A and time B contain code elements, Figure 4 The code elements of carrier A and time B are Figure 5 The symbols of carrier A and time B are transmitted at the same time and frequency. Furthermore, regarding frame composition, it is not affected by... Figure 4 , Figure 5 limited, Figure 4 , Figure 5 It's just one example of what frames are made of.

[0777] and, Figure 4 , Figure 5 The other code elements in the text are equivalent to " Figure 2 The code elements of "preamble signal 252" and "control information code element signal 253" are therefore, in conjunction with... Figure 4 The other code elements 403 are from the same time and at the same frequency (same carrier). Figure 5 In the case of other code elements 503 transmitting control information, the same data (the same control information) is transmitted.

[0778] In addition, although the idea is Figure 4 Frames and Figure 5 The frames are received simultaneously by the receiving device, even if the receiving device receives Figure 4 frames or Figure 5 The receiving device can also obtain the data sent from the transmitting device in the frame.

[0779] Figure 6 It shows the method used to generate Figure 2 An example of the configuration of the part related to the generation of control information signal 253 is provided, and since it has been described in detail in Embodiment 1, the description is omitted here.

[0780] Figure 7 It shows Figure 1 An example of the configuration of antenna section #A 109_A and antenna section #B 109_B is shown, illustrating an example where antenna section #A 109_A and antenna section #B 109_B are composed of multiple antennas. Figure 7 The contents shown are described in detail in Implementation 1, so the description is omitted here.

[0781] Figure 8 It shows Figure 1 The transmitting device, for example, transmits Figure 4 , Figure 5 An example of the configuration of a receiving device that receives a modulated signal when a transmission signal is composed of frames is provided. Since it has been described in detail in Embodiment 1, the description is omitted here.

[0782] Figure 10 It shows Figure 8 An example of the configuration of antenna section #X 801X and antenna section #Y 801Y is shown, illustrating an example where antenna section #X 801X and antenna section #Y 801Y are composed of multiple antennas. Figure 10 The contents shown are described in detail in Implementation 1, so the description is omitted here.

[0783] then, Figure 1 The signal processing unit 106 of the transmitting device shown is as follows: Figure 20 As shown, phase change units 205A, 205B and phase change unit 209A are inserted. Their features and effects are explained.

[0784] Such as using Figure 4 , Figure 5 As explained, precoding (weighted synthesis) is performed on the mapped signal s1(i) 201A obtained by mapping using the first series and the mapped signal s2(i) 201B obtained by mapping using the second series. Phase-changing units 205A and 205B perform phase changes on the resulting weighted synthesized signals 204A and 204B. Furthermore, the phase-changed signals 206A and 206B are transmitted at the same frequency and at the same time. Therefore, in Figure 4 , Figure 5 In China, targeting Figure 4 Data symbol 402 and Figure 5 The data symbol 502 undergoes a phase change. i is the symbol number, and i is an integer greater than or equal to 0.

[0785] For example, Figure 11 Showing the target Figure 4 The frames extracted from carriers 1 to 5, and from time $4 to time $6. Additionally, Figure 11 and Figure 4 Similarly, pilot symbol 401, data symbol 402, and other symbols 403 are shown.

[0786] As mentioned above, in Figure 11 The phase change unit 205A performs phase change on the data symbols shown in (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6).

[0787] Therefore, it will target Figure 11 The phase change values ​​of the data symbols shown are set as follows:

[0788] In (carrier 1, time $5) is "e" j×λ15(i) "

[0789] At (carrier 2, time $5) is "e" j×λ25(i) "

[0790] At (carrier 3, time $5) is "e" j×λ35(i) "

[0791] At (carrier 4, time $5) is "e" j×λ45(i) "

[0792] In (carrier 5, time $5) is "e" j×λ55(i) "

[0793] In (carrier 1, time $6) is "e" j×λ16(i) "

[0794] At (carrier 2, time $6) is "e" j×λ26(i) "

[0795] At (carrier 4, time $6) is "e" j×λ46(i) "

[0796] At (carrier 5, time $6) is "e" j×λ56(i) ".

[0797] Furthermore, in Figure 11 Of the symbols shown, the other symbols in (carrier 1, time $4), (carrier 2, time $4), (carrier 3, time $4), (carrier 4, time $4), (carrier 5, time $4), and the pilot symbol in (carrier 3, time $6) are not the targets of phase change by the phase change unit 205A.

[0798] This is a characteristic of the phase change unit 205A. Furthermore, in relation to... Figure 11 The data symbols in the phase-change objects (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are in the "same carrier, same time" context, such as... Figure 4 Configure the data carrier as shown.

[0799] That is, in Figure 4 In the diagram, (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are data symbols.

[0800] That is, the data symbols that perform MIMO transmission or transmit multiple streams are the targets of phase change by the phase change unit 205A.

[0801] Furthermore, as an example of the phase-changing unit 205A performing phase changes on data symbols, as shown in equation (50), there is a method for performing regular phase changes on data symbols, that is, a method for performing phase changes with a period of N. However, the method for performing phase changes on data symbols is not limited to this.

[0802] For example, Figure 11 Showing the target Figure 5 The frames extracted from carriers 1 to 5, and from time $4 to time $6. Additionally, in Figure 11 and Figure 5 Similarly, pilot symbol 501, data symbol 502, and other symbols 503 are shown.

[0803] As mentioned above, in Figure 11 In the symbols shown, the phase change unit 205B performs phase changes on the data symbols in (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6).

[0804] Therefore, it will target Figure 11 The phase change value of the data symbol shown is set as follows: at (carrier 1, time $5) it is "e". j×δ15(i) “e” in (carrier 2, time $5) j×δ25(i) “e” in (carrier 3, time $5) j×δ35(i) “e” in (carrier 4, time $5) j×δ45(i) “e” in (carrier 5, time $5) j×δ55(i) “e” in (carrier 1, time $6) j ×δ16(i) “e” in (carrier 2, time $6) j×δ26(i) “”, at (carrier 4, time $6) is “e” j×δ46(i) “e” in (carrier 5, time $6) j×δ56(i) ".

[0805] Furthermore, in Figure 11 The other symbols in (carrier 1, time $4), (carrier 2, time $4), (carrier 3, time $4), (carrier 4, time $4), (carrier 5, time $4), and the pilot symbols in (carrier 3, time $6) are not the targets of phase change by the phase change unit 205B.

[0806] This is a characteristic of the phase change unit 205B. Furthermore, in relation to... Figure 11The data symbols in the phase-change objects (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are in the "same carrier, same time" context, such as... Figure 4 Configure the data carrier as shown.

[0807] That is, in Figure 4 In the diagram, (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are data symbols.

[0808] That is, the data symbols that perform MIMO transmission or transmit multiple streams are the targets of phase change by the phase change unit 205B.

[0809] Furthermore, as an example of the phase-changing unit 205B performing phase changes on data symbols, as shown in equation (2), there is a method for performing regular phase changes on data symbols, that is, a method for performing phase changes with a period of N. However, the method for performing phase changes on data symbols is not limited to this.

[0810] Therefore, in environments dominated by direct sunlight, such as in LOS environments, it is possible to improve the reception quality of data in the receiving device that is transmitting MIMO or multiple streams of data symbols. This effect will be explained below.

[0811] For example, Figure 1 The modulation scheme used by the mapping unit 104 is QPSK. Figure 18 The mapped signal 201A is a QPSK signal, and the mapped signal 201B is also a QPSK signal. That is, two QPSK streams are sent.

[0812] Thus, in Figure 8 The signal processing unit 811, for example, uses channel estimation signals 806_1 and 806_2 to obtain 16 candidate signal points. QPSK can transmit 2 bits; since there are two streams, a total of 4 bits are transmitted. Therefore, there are 2... 4 = 16 candidate signal points.

[0813] In addition, using channel estimation signals 808_1 and 808_2, 16 other candidate signal points can be obtained. Since the explanation is the same, the explanation will focus on obtaining 16 candidate signal points using channel estimation signals 806_1 and 806_2.

[0814] An example of this state is given by Figure 12 As shown. Figure 12 A and Figure 12 B represents the phase I plane, and the vertical axis represents the quadrature Q plane. There are 16 candidate signal points in the phase I-quadrature Q plane. Among these 16 candidate signal points, one is the signal point transmitted by the transmitting device. Therefore, they are called "16 candidate signal points".

[0815] In environments dominated by direct sunlight, such as in LOS environments, the first case can be considered. Figure 20 In the case where the phase change units 205A and 205B are absent, that is... Figure 20 The phase change units 205A and 205B do not perform phase change.

[0816] In the "first scenario," since no phase change occurs, it is possible to fall into a trap. Figure 12 The state shown in A. Trapped in... Figure 12 In state A, as shown in "signal points 1201, 1202", "signal points 1203, 1204, 1205, 1206", and "signal points 1207, 1208", due to the presence of densely packed signal points, therefore... Figure 8 The quality of data reception may be reduced due to the receiver device.

[0817] To overcome this phenomenon, Figure 20 In the middle, phase change units 205A and 205B are inserted. If phase change units 205A and 205B are inserted, since the symbol number i, there exists Figure 12 The symbol numbering and existence of the "signal point dense area" shown in A Figure 12 As shown in B, the symbol numbering is mixed up due to the large distance between signal points. To address this situation, by introducing error-correcting codes, a high error-correction capability can be achieved. Figure 8 In the receiving device, high data reception quality can be obtained.

[0818] In addition, Figure 20 In the context of channel estimation for data symbols such as pilot symbols and preambles used for demodulation (detection), the term "pilot symbols, preambles" is used. Figure 20 The phase-changing units 205A and 205B do not perform phase changes. Therefore, in data symbols, it is possible to achieve, "because of symbol number i, thus..." Figure 12 The symbol number of the "dense signal point area" shown in A is... Figure 12 The symbol numbering shown in B, which indicates "large distance between signal points", is mixed up.

[0819] However, regarding the "pilot symbols and preamble" used for channel estimation of data symbols such as demodulation (detection) pilot symbols and preambles, in Figure 20 Even with phase changes performed by the phase-changing units 205A and 205B, the following situation may occur: "When the data symbol can achieve 'due to symbol number i, therefore there exists...'" Figure 12 The symbol numbering of the densely packed signal points shown in A is... Figure 12 The symbol numbering shown in B, which indicates "large distance between signal points", is mixed up.

[0820] In this case, certain conditions need to be added to the pilot symbols and preamble to perform phase changes. For example, a method of "performing phase changes on the pilot symbols and / or preamble" can be considered, which sets different rules than those for phase changes on the data symbols. As an example, there is a method of performing regular phase changes with a period of N on the data symbols and regular phase changes with a period of M on the pilot symbols and / or preamble. N and M are integers of 2 or higher.

[0821] As described above, the phase-changing unit 209B takes the baseband signal 208B and the control signal 200 as inputs, performs phase-changing on the baseband signal 208B according to the control signal 200, and outputs the phase-changed signal 210B. If the baseband signal 208B is taken as a function of symbol number i, it is represented as x'(i). Thus, the phase-changed signal 210B(x(i)) can be expressed as x(i) = e j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[0822] Furthermore, the phase-changing unit 209B can operate as a CDD / CSD as described in Non-Patent Documents 2 and 3. The phase-changing unit 209B performs phase changes on symbols present in the frequency axis direction. The phase-changing unit 209B performs phase changes on data symbols, pilot symbols, control information symbols, etc. Therefore, in this case, the symbols that become the object of symbol number i are data symbols, pilot symbols, control information symbols, and preambles (other symbols), etc.

[0823] exist Figure 20 In this case, since the phase change unit 209B performs phase change on the baseband signal 208B, therefore for Figure 5 The recorded symbols undergo phase changes.

[0824] Therefore, in Figure 5 In the frame, for time $1, all the symbols of all carriers (other symbols 503), Figure 20 The phase change unit 209B performs phase change.

[0825] same, Figure 20 The phase-changing unit 209B performs phase changes on the following symbols.

[0826] "All symbols of all carriers at time $2 (other symbols 503)"

[0827] "All symbols of all carriers at time $3 (other symbols 503)"

[0828] "All symbols of all carriers at time $4 (other symbols 503)"

[0829] "All symbols of all carriers at time $5 (pilot symbol 501 or data symbol 502)".

[0830] "All symbols of all carriers at time $6 (pilot symbol 501 or data symbol 502)".

[0831] "All symbols of all carriers at time $7 (pilot symbol 501 or data symbol 502)"

[0832] "All symbols of all carriers at time $8 (pilot symbol 501 or data symbol 502)"

[0833] "All symbols of all carriers at time $9 (pilot symbol 501 or data symbol 502)".

[0834] "All symbols of all carriers at time $10 (pilot symbol 501 or data symbol 502)"

[0835] "All symbols of all carriers at time $11 (pilot symbol 501 or data symbol 502)", omitting the records of other times and carriers.

[0836] Figure 13 It shows Figure 1 The transmission signal 108_A and Figure 4 The different frame configurations have been described in detail in Implementation 1, so the description is omitted here.

[0837] Figure 14 It shows Figure 1 The transmission signal 108_B and Figure 5 The different frame configurations have been described in detail in Implementation 1, so the description is omitted here.

[0838] exist Figure 13 The carrier A and time B contain code elements. Figure 14 When carrier A and time B contain code elements, Figure 13The code elements of carrier A and time B are Figure 14 The symbols of carrier A and time B are transmitted at the same time and frequency. Additionally, Figure 13 , Figure 14 The frame structure shown is just one example.

[0839] and, Figure 13 , Figure 14 The other code elements in the text are equivalent to " Figure 20 The code elements of "preamble signal 252" and "control information code element signal 253" are therefore, in conjunction with... Figure 13 The other code elements 403 are from the same time and at the same frequency (same carrier). Figure 14 In the case of other code elements 503 transmitting control information, the same data (the same control information) is transmitted.

[0840] In addition, although the idea is Figure 13 Frames and Figure 14 The frames are received simultaneously by the receiving device, even if the receiving device receives Figure 13 frames or Figure 14 The receiving device can also receive data sent by the transmitting device.

[0841] The phase-changing unit 209B takes the baseband signal 208B and the control signal 200 as inputs, performs phase-changing on the baseband signal 208B according to the control signal 200, and outputs the phase-changed signal 210B. The baseband signal 208B is used as a function of the symbol number i, represented as x'(i).

[0842] Thus, the phase-changed signal 210B(x(i)) can be expressed as x(i) = e j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit. Furthermore, the operation of the phase change unit 209B can also be the CDD / CSD described in Non-Patent Documents 2 and 3.

[0843] Furthermore, the phase-changing unit 209B performs phase changes on symbols present in the frequency axis direction. The phase-changing unit 209B performs phase changes on data symbols, pilot symbols, control information symbols, etc. At this time, the null character can also be considered as an object of phase change. Therefore, in this case, the symbols that become the object of symbol number i are data symbols, pilot symbols, control information symbols, preambles (other symbols), and the null character, etc.

[0844] However, since the null character has a zero in-phase component I (0) and a zero quadrature component Q (0), even if a phase shift is applied to the null character, the signal before the phase shift is the same as the signal after the phase shift. Therefore, the null character can also be interpreted as not being an object of phase shifting. Figure 20In this case, since the phase change unit 209B performs phase change on the baseband signal 208B, then for Figure 14 The recorded symbols undergo phase changes.

[0845] Therefore, in Figure 14 In the frame, for time $1, all the symbols of all carriers (other symbols 503), Figure 20 The phase change unit 209B performs a phase change. However, the handling of the phase change for the null character 1301 is the same as described previously.

[0846] same, Figure 20 The phase-changing unit 209B performs phase changes on the following symbols.

[0847] "All symbols of all carriers at time $2 (other symbols 503)"

[0848] "All symbols of all carriers at time $3 (other symbols 503)"

[0849] "All symbols of all carriers at time $4 (other symbols 503)"

[0850] "All symbols of all carriers at time $5 (pilot symbol 501 or data symbol 502)".

[0851] "All symbols of all carriers at time $6 (pilot symbol 501 or data symbol 502)".

[0852] "All symbols of all carriers at time $7 (pilot symbol 501 or data symbol 502)"

[0853] "All symbols of all carriers at time $8 (pilot symbol 501 or data symbol 502)"

[0854] "All symbols of all carriers at time $9 (pilot symbol 501 or data symbol 502)".

[0855] "All symbols of all carriers at time $10 (pilot symbol 501 or data symbol 502)"

[0856] "All symbols of all carriers at time $11 (pilot symbol 501 or data symbol 502)"

[0857] However, at all times and on all media, the handling of the phase change of the null character 1301 is the same as previously described. Descriptions of times and media other than those mentioned above are omitted.

[0858] The phase change value in the phase change unit 209B is represented as Ω(i). The baseband signal 208B is x'(i), and the phase-changed signal 210B is x(i). Therefore, x(i) = Ω(i) × x'(i) holds true.

[0859] For example, the value of the phase change can be set as in equation (38). Q is an integer greater than or equal to 2, and Q is the period of the phase change. j is the imaginary unit. However, equation (38) is only an example and is not limited thereto.

[0860] For example, Ω(i) can also be set by performing a phase change with a period Q.

[0861] And, for example, in Figure 5 , Figure 14 In this context, while assigning the same phase change value to the same carrier is possible, the phase change value can be set for each carrier individually. For example, it could look like the following.

[0862] ·against Figure 5 , Figure 14 In carrier 1, the phase change value is set as in equation (39) in a way that is independent of time.

[0863] ·against Figure 5 , Figure 14 The carrier 2 in the middle sets the phase change value as Equation (40) in a way that is independent of time.

[0864] ·against Figure 5 , Figure 14 The carrier 3 in the middle sets the phase change value as Equation (41) in a way that is independent of time.

[0865] ·against Figure 5 , Figure 14 The carrier 4 in the middle sets the phase change value as Equation (42) in a way that is independent of time.

[0866] Details regarding subsequent carriers are omitted.

[0867] The above is Figure 20 An example of the operation of the phase change unit 209B.

[0868] For passing Figure 20 The effects obtained by the phase change unit 209B will be explained.

[0869] exist" Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The other code elements 403 and 503 of the "frame" include control information code elements. As previously mentioned, in the same time and at the same frequency (same carrier) as other code elements 403, Figure 5 In the case of other code elements 503 outputting control information, the same data (same control information) is sent.

[0870] However, scenario 2 can be considered as: "using control information code elements..." Figure 1 The transmission is performed using either antenna section #A109_A or antenna section #B109_B.

[0871] In the transmission scenario shown in "Case 2", since the number of antennas transmitting control information symbols is 1, compared to the case where "control information symbols are transmitted using both antennas #A 109_A and antennas #B 109_B", the spatial diversity gain is smaller in "Case 2". Even so... Figure 8 If the receiving device receives the data, the data reception quality will be reduced. Therefore, in order to improve the data reception quality, it is preferable to "use both antenna sections #A 109_A and #B 109_B to transmit control information symbols".

[0872] Case 3 can be considered as: "Using control information code elements..." Figure 1 The antenna section #A 109_A and the antenna section #B 109_B transmit from both sides. However, in Figure 20 The phase change unit 209B in the middle does not perform phase change.

[0873] In the transmission case shown in "Case 3", since the modulation signal transmitted from antenna section #A109_A is the same as or offset by a specific phase from the modulation signal transmitted from antenna section #B109_B, the propagation environment of the radio waves... Figure 8 The receiving device may receive a poor-quality signal, and the modulation signals of both parties may be affected by the same multipath propagation. Therefore, in Figure 8 The receiving device exhibits a decrease in data reception quality.

[0874] To mitigate this phenomenon, Figure 20 In this configuration, a phase-changing unit 209B is provided. Accordingly, since the phase is changed in the time or frequency direction, therefore, in Figure 8 The receiving device can reduce the possibility of receiving poor-quality signals. Furthermore, since the multipath effects experienced by the modulated signal transmitted from antenna section #A109_A are likely to differ from those experienced by the modulated signal transmitted from antenna section #B109_B, the diversity gain is likely to be high. Therefore, in Figure 8 The receiving device can improve the quality of data reception.

[0875] Based on the above reasons, Figure 20A phase change unit 209B is installed to perform phase changes.

[0876] In addition to control information symbols 403 and 503, other symbols include symbols for demodulating and decoding control information symbols, such as symbols for signal detection, symbols for frequency and time synchronization, and symbols for channel estimation. Furthermore, in the… Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The frame includes pilot symbols 401 and 501. By utilizing these pilot symbols, it is possible to demodulate and decode the control information symbols with higher accuracy.

[0877] Furthermore, in " Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 In the frame, multiple streams are transmitted or MIMO transmission is performed at the same frequency (band) and at the same time through data symbol 402 and data symbol 502.

[0878] In order to demodulate these data symbols, symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation are used, which are included in other symbols 403 and other symbols 503.

[0879] At this time, the "other symbols 403 and other symbols 503 including symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation" are phase-changed by the phase-changing unit 209B as previously described.

[0880] In this situation, if the processing is not reflected in "for data symbol 402 and data symbol 502" or "for data symbol 502 as described above", when the receiving device demodulates and decodes data symbol 402 and data symbol 502, it is necessary to perform demodulation and decoding that reflects the processing of phase change performed by phase change unit 209B. Therefore, the possibility of the processing becoming complicated increases.

[0881] This is because the phase change unit 209B performs phase changes on "other symbols 403 and other symbols 503, including symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation".

[0882] However, as Figure 20As shown, in the phase change unit 209B, when phase change is performed "for data symbol 402 and data symbol 502" or "for data symbol 502 as described above", the advantage of the receiving device is that, by using the channel estimation signal (estimated signal of transport path variation) estimated by "other symbols 403 and other symbols 503 including symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation", data symbol 402 and data symbol 502 can be easily demodulated and decoded.

[0883] And, as Figure 20 As shown, when the phase change unit 209B performs phase change "for data symbol 402 and data symbol 502" or "for data symbol 502 as described above", the effect of the sharp decrease in electric field strength on the frequency axis in the multipath can be reduced, thereby improving the reception quality of data for data symbol 402 and data symbol 502.

[0884] Thus, the difference between "the object of the code element for which the phase change unit 205A, 205B performs phase change" and "the object of the code element for which the phase change unit 209B performs phase change" lies in their distinctive features.

[0885] As described above, through the Figure 20 The phase-changing units 205A and 205B perform phase-changing, thereby obtaining data symbol 402 and data symbol 502. For example, in a LOS environment, this improves the data reception quality in the receiving device. Figure 20 The phase change unit 209B performs phase change, for example, it can obtain " Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The control information symbols contained in the frame improve the reception quality in the receiving device and simplify the demodulation and decoding of data symbols 402 and 502.

[0886] In addition, through the Figure 20 The phase-changing units 205A and 205B perform phase changes, thereby improving the reception quality of data symbols 402 and 502 in the receiving device, for example, in a LOS environment. Furthermore, for data symbols 402 and 502, the phase changes are achieved by... Figure 20 The phase-changing unit 209B performs phase changes, thereby improving the reception quality of data symbol 402 and data symbol 502.

[0887] Furthermore, Q in equation (38) can be an integer less than -2, in which case the period of phase change becomes the absolute value of Q. This also applies to embodiment 1.

[0888] (Implementation Method 5)

[0889] In this embodiment, compared with embodiment 1 Figure 2 The implementation methods for different configurations will be explained.

[0890] Figure 1 An example of the configuration of a transmission device such as a base station, access point, or broadcasting station in this embodiment is shown. Since detailed descriptions have been provided in Embodiment 1, they are omitted here.

[0891] The signal processing unit 106 takes the mapped signals 105_1 and 105_2, signal group 110, and control signal 100 as inputs, performs signal processing according to control signal 100, and outputs processed signals 106_A and 106_B. At this time, processed signal 106_A is represented as u1(i), and processed signal 106_B is represented as u2(i). i is the symbol number, for example, i is an integer greater than or equal to 0. Furthermore, details regarding signal processing will be provided using... Figure 21 Please provide an explanation.

[0892] Figure 21 It shows Figure 1 An example of the configuration of the signal processing unit 106. The weighted synthesis unit (precoding unit) 203 processes the mapped signal 201A ( Figure 1 The mapped signal 105_1), the mapped signal 201B ( Figure 1 The mapped signal 105_2), control signal 200 ( Figure 1 The control signal 100 is used as input, and the signal is weighted and synthesized (pre-encoded) according to the control signal 200 to output the weighted signal 204A and the weighted signal 204B.

[0893] At this point, the mapped signal 201A is represented as s1(t), the mapped signal 201B as s2(t), the weighted signal 204A as z1'(t), and the weighted signal 204B as z2'(t). Additionally, as an example, t represents time. s1(t), s2(t), z1'(t), and z2'(t) are defined by complex numbers, and therefore can also be real numbers.

[0894] Here, although it is processed as a function of time, it can also be a function of "frequency (carrier number)", or it can be a function of "time and frequency". Furthermore, it can also be a function of "symbol number". In this respect, Implementation 1 is also the same.

[0895] The weighted synthesis unit (precoding unit) 203 performs the operation of formula (49).

[0896] Furthermore, the phase-changing unit 205A takes the weighted synthesized signal 204A and the control signal 200 as inputs, performs phase-changing on the weighted synthesized signal 204A according to the control signal 200, and outputs the phase-changed signal 206A. The phase-changed signal 206A is represented by z1(t), where z1(t) is defined by a complex number, but can also be a real number.

[0897] The specific operation of the phase-changing unit 205A will be explained. In the phase-changing unit 205A, for example, a phase change w(i) is performed on z1'(i). Therefore, it can be expressed as z1(i) = w(i) × z1'(i). i is the symbol number, and i is an integer greater than or equal to 0.

[0898] For example, the phase change value can be set as shown in equation (50).

[0899] M is an integer greater than or equal to 2, and M is the period of the phase change. Furthermore, if M is set to an odd number greater than or equal to 3, there is a possibility of improving the data reception quality. However, equation (50) is merely an example and is not a limitation. Therefore, with the phase change value w(i) = e j×λ(i) To express.

[0900] Furthermore, the phase-changing unit 205B takes the weighted synthesized signal 204B and the control signal 200 as inputs, performs phase-changing on the weighted synthesized signal 204B according to the control signal 200, and outputs the phase-changed signal 206B. Additionally, the phase-changed signal 206B is represented by z2(t), where z2(t) is defined by a complex number and can also be a real number.

[0901] The specific operation of the phase-changing unit 205B will be explained. In the phase-changing unit 205B, for example, a phase change of y(i) is performed for z2'(i). Therefore, it can be expressed as z2(i) = y(i) × z2'(i). i is the symbol number, and i is an integer greater than or equal to 0.

[0902] For example, the phase change value can be set as shown in equation (2). N is an integer greater than or equal to 2, and N is the period of the phase change. N ≠ M. If N is set to an odd number greater than or equal to 3, there is a possibility of improving the data reception quality. However, equation (2) is only an example and is not a limitation.

[0903] Therefore, the phase change value y(i) = e j×δ(i) To express.

[0904] At this point, z1(i) and z2(i) can be represented by equation (51).

[0905] Furthermore, δ(i) and λ(i) are real numbers. Also, z1(i) and z2(i) are transmitted from the transmitting device at the same time and at the same frequency (same frequency band). In equation (51), the value of the phase change is not limited to equations (2) and (51); for example, a method of periodic, regular phase changes can be considered.

[0906] Furthermore, as explained in Embodiment 1, the matrices (precoding matrices) in equations (49) and (51) can be considered as equations (5) to (36), etc. However, the precoding matrix is ​​not limited to this, and the same applies to Embodiment 1.

[0907] The insertion unit 207A takes the weighted synthesized signal 204A, pilot symbol signal pa(t) 251A, preamble signal 252, control information symbol signal 253, and control signal 200 as inputs, and outputs a baseband signal 208A based on the frame composition information contained in the control signal 200. t represents time.

[0908] Similarly, the insertion unit 207B takes the phase-changed signal 206B, the pilot symbol signal pb(t) 251B, the preamble signal 252, the control information symbol signal 253, and the control signal 200 as inputs, and outputs the baseband signal 208B based on the frame composition information contained in the control signal 200.

[0909] The phase-changing unit 209B takes the baseband signal 208B and the control signal 200 as inputs. It performs phase-changing on the baseband signal 208B according to the control signal 200 and outputs the phase-changed signal 210B. The baseband signal 208B is set as a function of symbol number i, represented as x'(i). Thus, the phase-changed signal x(i)210B can be expressed as x(i) = e j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[0910] Furthermore, as described in Embodiment 1, the operation of the phase-changing unit 209B can also be that of the CDD / CSD described in Non-Patent Documents 2 and 3. The phase-changing unit 209B performs phase changes on symbols present in the frequency axis direction. The phase-changing unit 209B performs phase changes on data symbols, pilot symbols, control information symbols, etc.

[0911] Figure 3 It shows Figure 1 An example of the configuration of the wireless units 107_A and 107_B. Figure 4 It shows Figure 1 The frame structure of the transmitted signal 108_A, Figure 5 It shows Figure 1 The frame structure of the transmission signal 108_B is described in detail in Embodiment 1, so the description is omitted here.

[0912] exist Figure 4 The carrier A and time B contain code elements. Figure 5 When carrier A and time B contain code elements, Figure 4 The code elements of carrier A and time B are Figure 5 The symbols of carrier A and time B are transmitted at the same time and frequency. Furthermore, regarding frame composition, it is not affected by... Figure 4 , Figure 5 limited, Figure 4 , Figure 5 It's just one example of what frames are made of.

[0913] and, Figure 4 , Figure 5 The other code elements in the text are equivalent to " Figure 2 The code elements of "preamble signal 252" and "control information code element signal 253" are therefore, in conjunction with... Figure 4 The other code elements 403 are from the same time and at the same frequency (same carrier). Figure 5 In the case of other code elements 503 transmitting control information, the same data (the same control information) is transmitted.

[0914] In addition, although the idea is Figure 4 Frames and Figure 5 The frames are received simultaneously by the receiving device, even if the receiving device receives Figure 4 frames or Figure 5 The receiving device can also obtain the data sent from the transmitting device in the frame.

[0915] Figure 6 It shows the method used to generate Figure 2 An example of the configuration of the part related to the generation of control information signal 253 is provided, but since it has been described in detail in Embodiment 1, the description is omitted here.

[0916] Figure 7 It shows Figure 1 An example of the configuration of antenna section #A 109_A and antenna section #B 109_B is shown, illustrating an example where antenna section #A 109_A and antenna section #B 109_B are composed of multiple antennas. Figure 7The details of this description are provided in Implementation Method 1 and will not be described here.

[0917] Figure 8 It shows Figure 1 The transmitting device, for example, in transmitting Figure 4 , Figure 5 An example of the configuration of a receiving device that receives a modulated signal when a transmission signal is composed of frames is provided. Since it has been described in detail in Embodiment 1, the description is omitted here.

[0918] Figure 10 It shows Figure 8 An example of the configuration of antenna section #X 801X and antenna section #Y 801Y is shown, illustrating an example where antenna section #X 801X and antenna section #Y 801Y are composed of multiple antennas. Figure 10 The details of this description are provided in Implementation Method 1 and will not be described here.

[0919] then, Figure 1 The signal processing unit 106 of the transmitting device shown is as follows: Figure 21 As shown, phase change units 205A, 205B and phase change unit 209B are inserted. Their features and effects are explained.

[0920] Such as using Figure 4 and Figure 5 As explained above, precoding (weighted synthesis) is performed on the mapped signal s1(i)201A obtained by mapping using the first series and the mapped signals s2(i) and (201B) obtained by mapping using the second series. The phase transformation units 205A and 205B perform phase transformation on the resulting weighted synthesized signals 204A and 204B. i is the symbol number, and i is an integer greater than or equal to 0.

[0921] Furthermore, the phase-changed signal 206A and the phase-changed signal 206B are transmitted at the same frequency and at the same time. Therefore, in Figure 4 , Figure 5 In China, targeting Figure 4 Data symbol 402, Figure 5 The data symbol 502 undergoes a phase change.

[0922] For example, Figure 11 against Figure 4 The frames extracted were carriers 1 to 5 and time intervals $4 to $6. Additionally, Figure 11 and Figure 4 Similarly, pilot symbol 401, data symbol 402, and other symbols 403 are shown.

[0923] As mentioned above, in Figure 11The phase change unit 205A performs phase changes on the data symbols shown in (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6).

[0924] Therefore, it will target Figure 11 The phase change value of the data symbol shown is set as follows: at (carrier 1, time $5) it is "e". j×λ15(i) “e” in (carrier 2, time $5) j×λ25(i) “e” in (carrier 3, time $5) j×λ35(i) “e” in (carrier 4, time $5) j×λ45(i) “e” in (carrier 5, time $5) j×λ55(i) “e” in (carrier 1, time $6) j ×λ16(i) “e” in (carrier 2, time $6) j×λ26(i) “”, at (carrier 4, time $6) is “e” j×λ46(i) “e” in (carrier 5, time $6) j×λ56(i) ".

[0925] Furthermore, in Figure 11 Of the symbols shown, the other symbols in (carrier 1, time $4), (carrier 2, time $4), (carrier 3, time $4), (carrier 4, time $4), (carrier 5, time $4), and the pilot symbols in (carrier 3, time $6) are not the targets of phase change by the phase change unit 205A.

[0926] This is a characteristic of the phase change unit 205A. Furthermore, in relation to... Figure 11 The data symbols in the phase-change objects (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are "the same carrier, the same time", such as Figure 4 The data carrier is configured as shown.

[0927] That is, in Figure 4 (Carrier 1, time $5), (Carrier 2, time $5), (Carrier 3, time $5), (Carrier 4, time $5), (Carrier 5, time $5), (Carrier 1, time $6), (Carrier 2, time $6), (Carrier 4, time $6), and (Carrier 5, time $6) are data symbols.

[0928] That is, the data symbols that perform MIMO transmission or transmit multiple streams are the targets of phase change by the phase change unit 205A.

[0929] Furthermore, as an example of the phase-changing unit 205A performing phase changes on data symbols, as shown in equation (50), there is a method for performing regular phase changes on data symbols, namely, a method for performing phase changes with a period of N. However, the method for performing phase changes on data symbols is not limited to this.

[0930] For example, Figure 11 against Figure 5 From the frames, carriers 1 to 5 and time intervals $4 to $6 were extracted. Additionally, Figure 11 and Figure 5 Similarly, pilot symbol 501, data symbol 502, and other symbols 503 are shown.

[0931] As mentioned above, in Figure 11 In the shown symbols, the phase change unit 205B performs phase change on the data symbols in (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6).

[0932] Therefore, it will target Figure 11 The phase change value of the data symbol shown is set as follows: at (carrier 1, time $5) it is "e". j×δ15(i) “e” in (carrier 2, time $5) j×δ25(i) “e” in (carrier 3, time $5) j×δ35(i) “e” in (carrier 4, time $5) j×δ45(i) “e” in (carrier 5, time $5) j×δ55(i) “e” in (carrier 1, time $6) j×δ16(i) “e” in (carrier 2, time $6) j×δ26(i) “”, at (carrier 4, time $6) is “e” j×δ46(i) “e” in (carrier 5, time $6) j ×δ56(i) ".

[0933] In addition, Figure 11 Of the symbols shown, the other symbols in (carrier 1, time $4), (carrier 2, time $4), (carrier 3, time $4), (carrier 4, time $4), (carrier 5, time $4), and the pilot symbols in (carrier 3, time $6) are not the targets of phase change by the phase change unit 205B.

[0934] In addition, in relation to Figure 11 The data symbols in the phase-change objects (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are "the same carrier, the same time", such as Figure 4 The data carrier is configured as shown.

[0935] That is, in Figure 4 In the diagram, (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are data symbols.

[0936] That is, the data symbols that perform MIMO transmission or transmit multiple streams are the objects of phase change by the phase change unit 205B.

[0937] Furthermore, as an example of the phase change unit 205B performing phase changes on data symbols, as shown in equation (2), there is a method for performing regular phase changes on data symbols, that is, a method for performing phase changes with a period of N. However, the method for performing phase changes on data symbols is not limited to this.

[0938] Therefore, in environments dominated by direct sunlight, such as LOS environments, it is possible to improve the data reception quality in receiving devices that perform MIMO transmission or transmit multiple streams of data symbols. This effect will be explained below.

[0939] For example, Figure 1 The modulation scheme used by the mapping unit 104 is QPSK. Figure 18 The mapped signal 201A is a QPSK signal, and the mapped signal 201B is also a QPSK signal. That is, two QPSK streams are sent.

[0940] Thus, in Figure 8 The signal processing unit 811, for example, uses channel estimation signals 806_1 and 806_2 to obtain 16 candidate signal points. QPSK transmits 2 bits, and since there are two streams, a total of 4 bits are transmitted. Therefore, there are 2... 4 = 16 candidate signal points.

[0941] Furthermore, although 16 other candidate signal points can be obtained using channel estimation signals 808_1 and 808_2, since the explanation is the same, the explanation will focus on obtaining 16 candidate signal points using channel estimation signals 806_1 and 806_2.

[0942] An example of this state is given by Figure 12 As shown. In Figure 12 A and Figure 12 In plane B, the horizontal axis represents in-phase I and the vertical axis represents orthogonal Q. There are 16 candidate signal points in the in-phase I-orthogonal Q plane. One of these 16 candidate signal points is the signal point transmitted by the transmitting device. Therefore, it is called "16 candidate signal points".

[0943] In environments dominated by direct sunlight, such as in a LOS environment, the first scenario can be considered. Figure 21 In the case where the phase change units 205A and 205B are absent, i.e., by Figure 21 The phase change units 205A and 205B do not perform phase change.

[0944] In the "first scenario," since no phase change occurs, it is possible to fall into... Figure 12 The state shown in A. Trapped in... Figure 12 In state A, as shown in "signal points 1201, 1202", "signal points 1203, 1204, 1205, 1206", and "signal points 1207, 1208", due to the presence of densely packed signal points, therefore... Figure 8 There is a possibility that the receiving device may experience a decrease in data reception quality.

[0945] To overcome this phenomenon, Figure 21 Insert phase transition units 205A and 205B. If phase transition units 205A and 205B are inserted, since the symbol number i, therefore... Figure 12 The symbol number of the "dense signal point area" shown in A is... Figure 12 The symbol numbering shown in B, where "the distance between signal points is large," is mixed. Because error-correcting codes are introduced for this state, high error-correcting capability is achieved. Figure 8 The receiving device can achieve high data reception quality.

[0946] In addition, Figure 21 For the "pilot symbols, preamble" used in channel estimation for data symbols such as demodulation (detection) pilot symbols and preambles, in Figure 21 The phase-changing units 205A and 205B do not perform phase changes. Therefore, in the data symbol, it can be achieved that, "because the symbol number i, therefore..." Figure 12The symbol number of the "dense signal point area" shown in A is... Figure 12 The symbol numbering shown in B, which indicates "large distance between signal points", is mixed up.

[0947] However, regarding the "pilot symbols and preambles" used for channel estimation of data symbols such as demodulation (detection) pilot symbols and preambles, in Figure 21 Even if the phase-changing units 205A and 205B perform phase changes, the following situation will occur: "When the data symbol can be realized, due to symbol number i, therefore there is..." Figure 12 The symbol numbering of the densely packed signal points shown in A is... Figure 12 The symbol numbering shown in B, which indicates "large distance between signal points", is mixed up.

[0948] In this case, it is necessary to add certain conditions to the pilot symbols and preamble for phase changes. For example, we can consider setting different rules than those for phase changes of data symbols, and a method of "phase changes for pilot symbols and / or preambles". As an example, there is a method of performing regular phase changes of period N for data symbols and regular phase changes of period M for pilot symbols and / or preambles. N and M are integers of 2 or higher.

[0949] As described above, the phase-changing unit 209A takes the baseband signal 208A and the control signal 200 as inputs, performs phase changing on the baseband signal 208A according to the control signal 200, and outputs the phase-changed signal 210A. The baseband signal 208A is set as a function of symbol number i, denoted by x'(i). Thus, the phase-changed signal 210A(x(i)) can be expressed as x(i) = e j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[0950] Furthermore, the operation of the phase-changing unit 209A can also be that of the CDD / CSD described in Non-Patent Documents 2 and 3. The phase-changing unit 209A performs phase changes on symbols existing in the frequency axis direction. The phase-changing unit 209A performs phase changes on data symbols, pilot symbols, control information symbols, etc. Therefore, in this case, the symbol that becomes the object of symbol number i is a data symbol, a pilot symbol, a control information symbol, a preamble (other symbols), etc.

[0951] exist Figure 21 Since the phase change unit 209A performs phase change on the baseband signal 208A, the factor is... Figure 4 The recorded symbols undergo phase changes.

[0952] Therefore, in Figure 4In the frame, for time $1, all the symbols of all carriers (other symbols 403), Figure 21 The phase change unit 209A performs phase change.

[0953] same, Figure 21 The phase-changing unit 209A performs phase changes on the following symbols.

[0954] "All symbols of all carriers at time $2 (other symbols 403)"

[0955] "All symbols of all carriers at time $3 (other symbols 403)"

[0956] "All symbols of all carriers at time $4 (other symbols 403)"

[0957] "All symbols of all carriers at time $5 (pilot symbol 401 or data symbol 402)".

[0958] "All symbols of all carriers at time $6 (pilot symbol 401 or data symbol 402)".

[0959] "All symbols of all carriers at time $7 (pilot symbol 401 or data symbol 402)".

[0960] "All symbols of all carriers at time $8 (pilot symbol 401 or data symbol 402)".

[0961] "All symbols of all carriers at time $9 (pilot symbol 401 or data symbol 402)".

[0962] "All symbols of all carriers at time $10 (pilot symbol 401 or data symbol 402)".

[0963] "All symbols of all carriers at time $11 (pilot symbol 401 or data symbol 402)", omitting records of other times and carriers.

[0964] Figure 13 It shows Figure 1 The transmission signal 108_A and Figure 4 The different frame configurations have been described in detail in Implementation 1, so the description is omitted here.

[0965] Figure 14 It shows Figure 1 The transmission signal 108_B and Figure 5 The different frame configurations have been described in detail in Implementation 1, so the description is omitted here.

[0966] exist Figure 13 The carrier A and time B contain code elements. Figure 14 When the carrier A and time B contain code elements, in Figure 13 The code of carrier A and time B and in Figure 14 The symbols of carrier A and time B are transmitted at the same time and frequency. Additionally, Figure 13 , Figure 14 The frame structure shown is just one example.

[0967] and, Figure 13 , Figure 14 The other code elements in the text are equivalent to " Figure 21 The code elements of "preamble signal 252" and "control information code element signal 253" are therefore, in conjunction with... Figure 13 The other code elements 403 are from the same time and at the same frequency (same carrier). Figure 14 In the case of other code elements 503 transmitting control information, the same data (the same control information) is transmitted.

[0968] In addition, although the idea is Figure 13 Frames and Figure 14 The frames are received simultaneously by the receiving device, even if the receiving device receives Figure 13 frames or Figure 14 The receiving device can also obtain the data sent from the transmitting device in the frame.

[0969] The phase-changing unit 209A takes the baseband signal 208A and the control signal 200 as inputs, performs phase changing on the baseband signal 208A according to the control signal 200, and outputs the phase-changed signal 210A. The baseband signal 208A is set as a function of symbol number i, denoted by x'(i). Thus, the phase-changed signal x(i)210A can be expressed as x(i) = e j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[0970] Furthermore, the operation of the phase-changing unit 209A can also be that of the CDD / CSD described in Non-Patent Documents 2 and 3. The phase-changing unit 209A performs phase changes on symbols existing in the frequency axis direction. The phase-changing unit 209A performs phase changes on data symbols, pilot symbols, control information symbols, etc. In this case, the null character can also be considered as an object of phase change.

[0971] Therefore, in this case, the code elements that become the object with code element number i are data code elements, pilot code elements, control information code elements, preamble (other code elements), null characters, etc.

[0972] However, since the in-phase component I of the null character is zero (0) and the quadrature component Q is zero (0), even if a phase shift is performed on the null character, the signal before the phase shift is the same as the signal after the phase shift. Therefore, the null character can also be interpreted as not being the object of phase shifting. Figure 21 In this case, since the phase change unit 209A performs phase change on the baseband signal 208A, therefore... Figure 13 The recorded symbols undergo phase changes.

[0973] Therefore, in Figure 13 In the frame, for time $1, all the symbols of all carriers (other symbols 403), Figure 21 The phase change unit 209A performs phase change. However, the processing of phase change for the null character 1301 is the same as previously described.

[0974] same, Figure 21 The phase-changing unit 209A performs phase changes for the following symbols.

[0975] "All symbols of all carriers at time $2 (other symbols 403)"

[0976] "All symbols of all carriers at time $3 (other symbols 403)"

[0977] "All symbols of all carriers at time $4 (other symbols 403)"

[0978] "All symbols of all carriers at time $5 (pilot symbol 401 or data symbol 402)".

[0979] "All symbols of all carriers at time $6 (pilot symbol 401 or data symbol 402)".

[0980] "All symbols of all carriers at time $7 (pilot symbol 401 or data symbol 402)".

[0981] "All symbols of all carriers at time $8 (pilot symbol 401 or data symbol 402)".

[0982] "All symbols of all carriers at time $9 (pilot symbol 401 or data symbol 402)".

[0983] "All symbols of all carriers at time $10 (pilot symbol 401 or data symbol 402)".

[0984] "All symbols (pilot symbol 401 or data symbol 402) of all carriers at time $11" However, at all times and on all carriers, the phase change of the null character 1301 is handled in the same way as previously described.

[0985] Records regarding times and media other than those mentioned above are omitted.

[0986] The phase change value in the phase change unit 209A is represented as Ω(i). The baseband signal 208A is x'(i), and the phase-changed signal 210A is x(i). Therefore, x(i) = Ω(i) × x'(i) holds true.

[0987] For example, the value of the phase change can be set as in equation (38). Q is an integer greater than or equal to 2, and Q is the period of the phase change. j is the imaginary unit. However, equation (38) is only an example and is not limited thereto.

[0988] For example, Ω(i) can be set in a way that uses a periodic Q to change the phase.

[0989] And it can be, for example, in Figure 4 , Figure 13 In this process, the same phase change value is assigned to the same carrier, and the phase change value is set according to each carrier.

[0990] For example, as shown below.

[0991] ·against Figure 4 , Figure 13 In the carrier 1, the phase change value is set as Equation (39) in a way that is independent of time.

[0992] ·against Figure 4 , Figure 13 In carrier 2, the phase change value is set as Equation (40) in a way that is independent of time.

[0993] ·against Figure 4 , Figure 13 The carrier 3 in the middle sets the phase change value as Equation (41) in a way that is independent of time.

[0994] ·against Figure 4 , Figure 13 In the carrier 4, the phase change value is set as Equation (42) in a way that is independent of time.

[0995] Descriptions of carriers other than those mentioned above are omitted.

[0996] The above is Figure 21 Example of operation of phase change unit 209A.

[0997] For passing Figure 21The effects obtained by the phase change unit 209A will be explained.

[0998] exist" Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The other code elements 403 and 503 of the "frame" include control information code elements. As described above, in the same time and at the same frequency (same carrier) as other code elements 403, Figure 5 In the case of other code elements 503 transmitting control information, the same data (the same control information) is sent.

[0999] However, as in case 2, it can be considered that "the control information code elements are changed from..." Figure 1 The antenna section #A109_A or antenna section #B109_B can be used to transmit the signal.

[1000] In the transmission scenario shown in "Case 2", since the number of antennas transmitting control information symbols is 1, compared to the case where "control information symbols are transmitted using both antennas #A 109_A and #B 109_B", the spatial diversity gain is smaller. Therefore, in "Case 2", even... Figure 8 If the receiving device receives the data, the data reception quality will also be reduced. From the viewpoint of improving data reception quality, it is preferable to "use both antenna sections #A 109_A and #B 109_B to transmit control information symbols".

[1001] As for scenario 3, "utilization" can be considered. Figure 1 The antenna sections #A 109_A and #B 109_B transmit control information symbols. However, in Figure 21 The phase change unit 209A in the middle does not perform phase change.

[1002] In the transmission scenario shown in "Case 3", since the modulation signal transmitted from antenna section #A109_A is the same as or offset by a specific phase from the modulation signal transmitted from antenna section #B109_B, due to the propagation environment of the radio waves, Figure 8 The receiving device may receive a very poor quality signal, and both modulated signals will be affected by the same multipath propagation. Therefore, in Figure 8 The receiving device may experience a decrease in data reception quality.

[1003] To mitigate this phenomenon, Figure 21 A phase-changing unit 209A is provided. Accordingly, since the phase is changed in the time or frequency direction, therefore, in Figure 8The receiving device can reduce the possibility of receiving a poor-quality signal. Furthermore, since the multipath effects on the modulated signal transmitted from antenna section #A 109_A are more likely to differ from those on the modulated signal transmitted from antenna section #B 109_B, the possibility of obtaining diversity gain is also higher. Therefore, in Figure 8 The receiving device can improve the quality of data reception.

[1004] For the reasons mentioned above, Figure 21 A phase change unit 209A is provided in the middle to perform phase change.

[1005] In addition to control information symbols 403 and 503, other symbols include symbols for demodulating and decoding control information symbols, such as symbols for signal detection, symbols for frequency and time synchronization, and symbols for channel estimation. Furthermore, in the… Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The frame includes pilot symbols 401 and 501. By utilizing these symbols, the control information symbols can be demodulated and decoded with higher accuracy.

[1006] Furthermore, in " Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 In a frame, multiple streams are transmitted at the same frequency (same frequency band) and time using data symbols 402 and 502, or MIMO transmission is performed. To demodulate these data symbols, symbols for signal detection, frequency synchronization and time synchronization, and channel estimation are included in other symbols 403 and 503.

[1007] At this time, the "symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation included in other symbols 403 and other symbols 503" are phase-changed by the phase-changing unit 209A as described above.

[1008] In this situation, if the processing is not reflected in "for data symbol 402 and data symbol 502" or "for data symbol 402 as described above", and the receiving device demodulates and decodes data symbol 402 and data symbol 502, demodulation and decoding that reflects the phase change processing performed on the phase change unit 209A is required, which increases the possibility that the processing will become complicated.

[1009] This is because the phase change unit 209A performs phase changes on the "symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation contained in other symbols 403 and other symbols 503".

[1010] However, as Figure 21 As shown, when the phase change unit 209A performs phase change on data symbol 402 and data symbol 502 (in the case described above, on data symbol 402), the receiving device can (simply) demodulate and decode data symbol 402 and data symbol 502 using the channel estimation signal (the estimation signal of the transport path variation) estimated by "symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation included in other symbols 403 and other symbols 503".

[1011] In addition, such as Figure 21 As shown, when the phase change unit 209A performs phase change on data symbol 402 and data symbol 502 (in the case described above, on data symbol 402), the effect of the sharp decrease in electric field strength on the frequency axis in the multipath can be reduced, thereby improving the reception quality of data of data symbol 402 and data symbol 502.

[1012] Thus, the difference between "becoming the object of the code element that performs phase change for phase change unit 205A, 205B" and "becoming the object of the code element that performs phase change for phase change unit 209A" is a key feature.

[1013] As described above, through the Figure 21 The phase-changing units 205A and 205B perform phase-changing, thereby obtaining data symbol 402 and data symbol 502. For example, in a LOS environment, this improves the data reception quality in the receiving device. Figure 21 The phase change unit 209A performs phase change, for example, it can improve the " Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The control information symbols contained in the frame are received in the receiving device to improve the reception quality, thereby simplifying the demodulation and decoding of data symbols 402 and 502.

[1014] In addition, through Figure 21The phase-changing units 205A and 205B perform phase changes, thereby improving the reception quality of data symbols 402 and 502 in the receiving device, for example, in a LOS environment. Furthermore, by adjusting the phase of data symbols 402 and 502... Figure 21 The phase-changing unit 209A performs phase-changing, thereby improving the reception quality of data symbol 402 and data symbol 502.

[1015] Furthermore, Q in equation (38) can be an integer less than -2, in which case the period of phase change is the absolute value of Q. This also applies to embodiment 1.

[1016] (Implementation Method 6)

[1017] In this embodiment, compared with embodiment 1 Figure 2 The implementation methods for different configurations will be explained.

[1018] Figure 1 An example of the configuration of a transmission device such as a base station, access point, or broadcasting station in this embodiment is shown. Since detailed descriptions have been provided in Embodiment 1, they are omitted here.

[1019] The signal processing unit 106 takes the mapped signals 105_1 and 105_2, signal group 110, and control signal 100 as inputs, performs signal processing according to control signal 100, and outputs the processed signals 106_A and 106_B. At this time, the processed signal 106_A is represented by u1(i), and the processed signal 106_B is represented by u2(i). i is the symbol number; for example, i is an integer greater than or equal to 0. Furthermore, details regarding signal processing will be provided using... Figure 22 Please provide an explanation.

[1020] Figure 22 It shows Figure 1 An example of the configuration of the signal processing unit 106. The weighted synthesis unit (precoding unit) 203 processes the mapped signal 201A ( Figure 1 The mapped signal 105_1), the mapped signal 201B ( Figure 1 The mapped signal 105_2), and the control signal 200 ( Figure 1 The control signal 100 is used as input, and the signal is weighted and synthesized (pre-encoded) according to the control signal 200 to output the weighted signal 204A and the weighted signal 204B.

[1021] At this point, the mapped signal 201A is represented by s1(t), the mapped signal 201B by s2(t), the weighted signal 204A by z1'(t), and the weighted signal 204B by z2'(t). Additionally, as an example, t represents time. s1(t), s2(t), z1'(t), and z2'(t) are defined by complex numbers, and therefore can also be real numbers.

[1022] Here, although it is processed as a function of time, it can also be processed as a function of "frequency (carrier number)", or as a function of "time and frequency". Furthermore, it can also be a function of "symbol number". This is also the same as in Implementation Method 1.

[1023] The weighted synthesis unit (precoding unit) 203 performs the operation of formula (49).

[1024] Furthermore, the phase-changing unit 205A takes the weighted synthesized signal 204A and the control signal 200 as inputs, performs phase-changing on the weighted synthesized signal 204A according to the control signal 200, and outputs the phase-changed signal 206A. Additionally, the phase-changed signal 206A is represented by z1(t), where z1(t) is defined by a complex number, but can also be a real number.

[1025] The specific operation of the phase-changing unit 205A will be explained. In the phase-changing unit 205A, for example, a phase change w(i) is performed on z1'(i). Therefore, it can be expressed as z1(i) = w(i) × z1'(i). i is the symbol number, and i is an integer greater than or equal to 0.

[1026] For example, the phase change value can be set as shown in equation (50).

[1027] M is an integer greater than or equal to 2, and M is the period of the phase change. If M is set to an odd number greater than or equal to 3, there is a possibility of improving the data reception quality. However, equation (50) is only an example and is not a limitation. Therefore, the phase change value w(i) = e j ×λ(i) To express.

[1028] Furthermore, the phase-changing unit 205B takes the weighted synthesized signal 204B and the control signal 200 as inputs, performs phase-changing on the weighted synthesized signal 204B according to the control signal 200, and outputs the phase-changed signal 206B. Additionally, the phase-changed signal 206B is represented by z2(t), where z2(t) is defined as a complex number, but can also be a real number.

[1029] The specific operation of the phase-changing unit 205B will be explained. In the phase-changing unit 205B, for example, a phase change of y(i) is performed for z2'(i). Therefore, it can be expressed as z2(i) = y(i) × z2'(i). i is the symbol number, and i is an integer greater than or equal to 0.

[1030] For example, the phase change value can be set as shown in equation (2). N is an integer greater than or equal to 2, and N is the period of the phase change. N ≠ M. If N is set to an odd number greater than or equal to 3, there is a possibility of improving the data reception quality. However, equation (2) is only an example and is not a limitation. Therefore, the phase change value y(i) = e j×δ(i) To express.

[1031] At this point, z1(i) and z2(i) can be represented by equation (51).

[1032] Furthermore, δ(i) and λ(i) are real numbers. Also, z1(i) and z2(i) are transmitted from the transmitting device at the same time and at the same frequency (same frequency band). In equation (51), the value of the phase change is not limited to equations (2) and (51); for example, a periodic and regular method of phase change can be considered.

[1033] Furthermore, as explained in Embodiment 1, the matrices (precoding matrices) in equations (49) and (51) can be derived from equations (5) to (36), etc. However, the precoding matrix is ​​not limited to this. The same applies to Embodiment 1.

[1034] The insertion unit 207A takes the weighted synthesized signal 204A, pilot symbol signal pa(t) 251A, preamble signal 252, control information symbol signal 253, and control signal 200 as inputs, and outputs a baseband signal 208A based on the frame composition information contained in the control signal 200. t represents time.

[1035] Similarly, the insertion unit 207B takes the phase-changed signal 206B, the pilot symbol signal pb(t) 251B, the preamble signal 252, the control information symbol signal 253, and the control signal 200 as inputs, and outputs the baseband signal 208B based on the frame composition information contained in the control signal 200.

[1036] The phase-changing unit 209B takes the baseband signal 208B and the control signal 200 as inputs, performs phase-changing on the baseband signal 208B based on the control signal 200, and outputs the phase-changed signal 210B. The baseband signal 208B is used as a function of the symbol number i (i is an integer greater than or equal to 0), represented by x'(i). Thus, the phase-changed signal 210B(x(i)) can be expressed as x(i) = e^(-i / i). j×ε(i) ×x'(i). j is the imaginary unit.

[1037] Furthermore, as described in Embodiment 1, the phase-changing unit 209B can operate as a CDD / CSD as described in Non-Patent Documents 2 and 3. The phase-changing unit 209B performs phase changes on symbols present in the frequency axis direction. The phase-changing unit 209B performs phase changes on data symbols, pilot symbols, control information symbols, etc.

[1038] Figure 3 It shows Figure 1 An example of the configuration of the wireless units 107_A and 107_B is provided, and the description is omitted here as it has been described in detail in Embodiment 1.

[1039] Figure 4 It shows Figure 1 The frame structure of the transmitted signal 108_A is described in detail in Embodiment 1, so the description is omitted here.

[1040] Figure 5 It shows Figure 1 The frame structure of the transmission signal 108_B is described in detail in Embodiment 1, so the description is omitted here.

[1041] exist Figure 4 The carrier A and time B contain code elements. Figure 5 When carrier A and time B contain code elements, Figure 4 The code elements of carrier A and time B are Figure 5 The symbols of carrier A and time B are transmitted at the same time and frequency. Furthermore, regarding frame composition, it is not affected by... Figure 4 and Figure 5 limited, Figure 4 and Figure 5 It's just one example of what frames are made of.

[1042] and, Figure 4 and Figure 5 The other code elements in the text are equivalent to " Figure 2 The code elements of "preamble signal 252" and "control information code element signal 253" are therefore, in conjunction with... Figure 4 The other code elements 403 are from the same time and at the same frequency (same carrier). Figure 5 In the case of other code elements 503 transmitting control information, the same data (the same control information) is transmitted.

[1043] In addition, although the idea is Figure 4 Frames and Figure 5 The frames are received simultaneously by the receiving device, even if the receiving device receives Figure 4 frames or Figure 5 The receiving device can also receive the data sent by the transmitting device from the frame.

[1044] Figure 6 It shows the method used to generate Figure 2 An example of the configuration of the part related to the generation of control information signal 253 is provided, and since it has been described in detail in Embodiment 1, the description is omitted here.

[1045] Figure 7 It shows Figure 1 An example of the configuration of antenna section #A 109_A and antenna section #B 109_B is shown, illustrating an example where antenna section #A 109_A and antenna section #B 109_B are composed of multiple antennas. Figure 7 The details of this description are omitted here as they have been described in detail in Implementation Method 1.

[1046] Figure 8 It shows in Figure 1 The transmitting device, for example, to Figure 4 , Figure 5 An example of a receiving device that receives a modulated signal when a transmission signal consisting of frames is transmitted is provided. Since it has been described in detail in Embodiment 1, the description is omitted here.

[1047] Figure 10 It shows Figure 8 An example of the configuration of antenna section #X 801X and antenna section #Y 801Y is shown, illustrating an example where antenna section #X 801X and antenna section #Y 801Y are composed of multiple antennas. Figure 10 The contents shown are described in detail in Embodiment 1, so the description is omitted here.

[1048] then, Figure 1 The signal processing unit 106 of the transmitting device shown is as follows: Figure 22 As shown, phase change units 205A and 205B, and phase change unit 209B are inserted. Their features and effects are explained.

[1049] Such as using Figure 4 , Figure 5As explained, the pre-coding (weighted synthesis) is performed on the mapped signal s1(i)201A obtained by mapping using the first series and the mapped signal s2(i)201B obtained by mapping using the second series. The phase transformation units 205A and 205B perform phase transformation on the resulting weighted synthesized signals 204A and 204B. i is the symbol number, and i is an integer greater than or equal to 0.

[1050] Furthermore, the phase-changed signal 206A and the phase-changed signal 206B are transmitted at the same frequency and at the same time. Therefore, in Figure 4 , Figure 5 In China, Figure 4 Data symbol 402 and Figure 5 The data symbol 502 undergoes a phase change.

[1051] For example, Figure 11 against Figure 4 From the frames, carriers 1 to 5 and time intervals $4 to $6 were extracted. Additionally, Figure 11 and Figure 4 Similarly, pilot symbol 401, data symbol 402, and other symbols 403 are shown.

[1052] As mentioned above, in Figure 11 In the code elements shown, the phase change unit 205A performs phase change on the data code elements in (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6).

[1053] Therefore, it will target Figure 11 The phase change value of the data symbol shown is set as follows: at (carrier 1, time $5) it is "e". j×λ15(i) “e” in (carrier 2, time $5) j×λ25(i) “e” in (carrier 3, time $5) j×λ35(i) “e” in (carrier 4, time $5) j×λ45(i) “e” in (carrier 5, time $5) j×λ55(i) “e” in (carrier 1, time $6) j ×λ16(i) “e” in (carrier 2, time $6) j×λ26(i) “”, at (carrier 4, time $6) is “e” j×λ46(i) “e” in (carrier 5, time $6) j×λ56(i) ".

[1054] Furthermore, in Figure 11Of the symbols shown, the other symbols in (carrier 1, time $4), (carrier 2, time $4), (carrier 3, time $4), (carrier 4, time $4), (carrier 5, time $4), and the pilot symbols in (carrier 3, time $6) are not the targets of phase change by the phase change unit 205A.

[1055] This is a characteristic feature of the phase change unit 205A. Additionally, in relation to... Figure 11 The data symbols in the phase-change objects (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are in the "same carrier, same time" context, such as... Figure 4 As shown, a data carrier has been configured.

[1056] That is, in Figure 4 In the diagram, (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are data symbols.

[1057] That is, the data symbols that are used for MIMO transmission or transmission of multiple streams are the targets of phase change by the phase change unit 205A.

[1058] Furthermore, as an example of the phase-changing unit 205A performing phase changes on data symbols, as shown in equation (50), there is a method for performing regular phase changes on data symbols, namely, a method for performing phase changes with a period of N. However, the method for performing phase changes on data symbols is not limited to this.

[1059] For example, Figure 11 against Figure 5 The frames extracted were carriers 1 to 5 and time intervals $4 to $6. Additionally, Figure 11 and Figure 5 Similarly, pilot symbol 501, data symbol 502, and other symbols 503 are shown.

[1060] As mentioned above, in Figure 11 The code symbols shown are phase-modified by the phase-modification unit 205B for the data code symbols in (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6).

[1061] Therefore, it will target Figure 11 The phase change value of the data symbol shown is set as follows: at (carrier 1, time $5) it is "e". j×δ15(i) “e” in (carrier 2, time $5) j×δ25(i) “e” in (carrier 3, time $5) j×δ35(i) “e” in (carrier 4, time $5) j×δ45(i) “e” in (carrier 5, time $5) j×δ55(i) “e” in (carrier 1, time $6) j ×δ16(i) “e” in (carrier 2, time $6) j×δ26(i) “”, at (carrier 4, time $6) is “e” j×δ46(i) “e” in (carrier 5, time $6) j×δ56(i) ".

[1062] Furthermore, in Figure 11 The other symbols in (carrier 1, time $4), (carrier 2, time $4), (carrier 3, time $4), (carrier 4, time $4), (carrier 5, time $4) shown, as well as the pilot symbols in (carrier 3, time $6), are not the targets of phase change by the phase change unit 205B.

[1063] This is a characteristic of the phase change unit 205B. Furthermore, in relation to... Figure 11 The data symbols in the phase-change objects (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are "the same carrier, the same time", such as Figure 4 The data carrier is configured as shown.

[1064] That is, in Figure 4 In the diagram, (carrier 1, time $5), (carrier 2, time $5), (carrier 3, time $5), (carrier 4, time $5), (carrier 5, time $5), (carrier 1, time $6), (carrier 2, time $6), (carrier 4, time $6), and (carrier 5, time $6) are data symbols.

[1065] That is, the data symbols that are used for MIMO transmission or transmission of multiple streams are the targets of phase change by the phase change unit 205B.

[1066] Furthermore, as an example of the phase-changing unit 205B performing phase changes on data symbols, as shown in equation (2), there is a method for performing regular phase changes on data symbols, that is, a method for performing phase changes with a period of N. However, the method for performing phase changes on data symbols is not limited to this.

[1067] Therefore, in environments dominated by direct sunlight, such as LOS environments, it is possible to improve the reception quality of data symbols transmitted via MIMO or multiple streams in the receiving device. This effect will be explained.

[1068] For example, Figure 1 The modulation scheme used by the mapping unit 104 is QPSK. Figure 18 The mapped signal 201A is a QPSK signal, and the mapped signal 201B also becomes a QPSK signal. That is, two QPSK streams are sent.

[1069] Thus, in Figure 8 The signal processing unit 811, for example, uses channel estimation signals 806_1 and 806_2 to obtain 16 candidate signal points. QPSK transmits 2 bits, and since there are two streams, a total of 4 bits are transmitted. Therefore, there are 2... 4 = 16 candidate signal points.

[1070] Furthermore, although 16 other candidate signal points can be obtained using channel estimation signals 808_1 and 808_2, since the explanation is the same, the focus will be on the explanation of obtaining 16 candidate signal points using channel estimation signals 806_1 and 806_2.

[1071] An example of this state is given by Figure 12 As shown. In Figure 12 A and Figure 12 B represents the phase I plane, and the horizontal axis represents the quadrature Q plane. In the phase I-quadrature Q plane, there are 16 candidate signal points. One of these 16 candidate signal points is the signal point transmitted by the transmitting device. Therefore, they are called "16 candidate signal points".

[1072] In environments dominated by direct sunlight, such as LOS environments, the first case can be considered: "nothing exists." Figure 22 The phase change units 205A and 205B, i.e. Figure 22 The phase change units 205A and 205B do not perform phase change.

[1073] In the "first scenario," since no phase change occurs, it may fall into a trap. Figure 12 The possibilities of the state shown in A. Falling into... Figure 12In state A, as shown in "signal points 1201, 1202", "signal points 1203, 1204, 1205, 1206", and "signal points 1207, 1208", due to the presence of densely packed signal points, therefore... Figure 8 The receiving device will experience a decrease in data reception quality.

[1074] To overcome this phenomenon, Figure 22 Phase transition units 205A and 205B are inserted. When inserting phase transition units 205A and 205B, due to symbol number i, therefore, there exists... Figure 12 The symbol number of the "dense signal point area" shown in A, and... Figure 12 As shown in B, the symbol numbering is mixed up due to the large distance between signal points. To address this situation, by introducing error-correcting codes, a high error-correction capability can be achieved. Figure 8 The receiving device can achieve high data reception quality.

[1075] In addition, Figure 22 In the context of channel estimation, specifically for "pilot symbols and preambles" used to demodulate (detect) data symbols such as pilot symbols and preambles, the term "pilot symbols and preambles" is used. Figure 22 Phase-changing units 205A and 205B do not perform phase changes. Therefore, in data symbols, it is possible to achieve, "due to symbol number i, thus..." Figure 12 The symbol number of the "dense signal point area" shown in A is... Figure 12 The symbol numbering shown in B, which indicates "large distance between signal points", is mixed up.

[1076] However, regarding the "pilot symbols and preamble" used for channel estimation in demodulating (detecting) data symbols such as pilot symbols and preambles, in Figure 22 Even if the phase-changing units 205A and 205B perform phase changes, the following situation will occur: "When the data symbol can achieve "Because of symbol number i, therefore, there exists Figure 12 The symbol number of the "dense signal point area" shown in A, and... Figure 12 The symbol numbering shown in B, which indicates "large distance between signal points", is mixed up.

[1077] In this case, some additional conditions are needed to perform phase changes on the pilot symbols and preamble. For example, one could consider setting different rules than those for phase changes on the data symbols, and then implementing a method for "phase changes on the pilot symbols and / or preamble." As examples, there are methods for performing regular phase changes with a period of N on the data symbols and regular phase changes with a period of M on the pilot symbols and / or preamble. N and M are integers greater than or equal to 2.

[1078] As described above, the phase-changing unit 209A takes the baseband signal 208A and the control signal 200 as inputs, performs phase-changing on the baseband signal 208A according to the control signal 200, and outputs the phase-changed signal 210A. The baseband signal 208A is used as a function of symbol number i, represented as x'(i). Thus, the phase-changed signal x(i)210A can be expressed as x(i)=e j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[1079] Furthermore, the operation of the phase-changing unit 209A can also be that of the CDD / CSD described in Non-Patent Documents 2 and 3. The phase-changing unit 209A performs phase changes on symbols existing in the frequency axis direction. The phase-changing unit 209A performs phase changes on data symbols, pilot symbols, control information symbols, etc.

[1080] Therefore, in this case, the symbol that becomes the object with symbol number i is a data symbol, pilot symbol, control information symbol, preamble (other symbols), etc. Figure 22 In this case, since the phase change unit 209A performs phase change on the baseband signal 208A, therefore, for Figure 4 The recorded symbols undergo phase changes.

[1081] Therefore, in Figure 4 In the frame, for time $1, all the symbols of all carriers (other symbols 403) are... Figure 22 The phase change unit 209A performs phase change.

[1082] same, Figure 22 The phase-changing unit 209A performs phase changes for the following symbols.

[1083] "All symbols of all carriers at time $2 (other symbols 403)"

[1084] "All symbols of all carriers at time $3 (other symbols 403)"

[1085] "All symbols of all carriers at time $4 (other symbols 403)"

[1086] "All symbols of all carriers at time $5 (pilot symbol 401 or data symbol 402)"

[1087] "All symbols of all carriers at time $6 (pilot symbol 401 or data symbol 402)"

[1088] "All symbols of all carriers at time $7 (pilot symbol 401 or data symbol 402)"

[1089] "All symbols of all carriers at time $8 (pilot symbol 401 or data symbol 402)"

[1090] "All symbols of all carriers at time $9 (pilot symbol 401 or data symbol 402)"

[1091] "All symbols of all carriers at time $10 (pilot symbol 401 or data symbol 402)"

[1092] "All symbols of all carriers at time $11 (pilot symbol 401 or data symbol 402)", omitting records of other times and carriers.

[1093] As described above, the phase-changing unit 209B takes the baseband signal 208B and the control signal 200 as inputs, performs phase-changing on the baseband signal 208B according to the control signal 200, and outputs the phase-changed signal 210B. The baseband signal 208B is set as a function of symbol number i, represented as y'(i). Thus, the phase-changed signal y(i)210B can be expressed as y(i)=e j×η(i) ×y'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[1094] Furthermore, the operation of the phase-changing unit 209B can also be the CDD / CSD described in Non-Patent Documents 2 and 3. The phase-changing unit 209B performs phase changes on symbols existing in the frequency axis direction. The phase-changing unit 209B performs phase changes on data symbols, pilot symbols, control information symbols, etc.

[1095] Therefore, in this case, the symbol that becomes the object with symbol number i is a data symbol, pilot symbol, control information symbol, preamble (other symbols), etc. Figure 22 In this case, since the phase change unit 209B performs the phase change on the baseband signal 208B, therefore, for Figure 5 The recorded symbols undergo phase changes.

[1096] Therefore, in Figure 5 In the frame, Figure 22 The phase-changing unit 209B performs phase changes on all symbols (other symbols 503) of all carriers at time $1.

[1097] same, Figure 22 The phase-changing unit 209B performs phase changes on the following symbols.

[1098] "All symbols of all carriers at time $2 (other symbols 503)"

[1099] "All symbols of all carriers at time $3 (other symbols 503)"

[1100] "All symbols of all carriers at time $4 (other symbols 503)"

[1101] "All symbols of all carriers at time $5 (pilot symbol 501 or data symbol 502)".

[1102] "All symbols of all carriers at time $6 (pilot symbol 501 or data symbol 502)".

[1103] "All symbols of all carriers at time $7 (pilot symbol 501 or data symbol 502)"

[1104] "All symbols of all carriers at time $8 (pilot symbol 501 or data symbol 502)"

[1105] "All symbols of all carriers at time $9 (pilot symbol 501 or data symbol 502)".

[1106] "All symbols of all carriers at time $10 (pilot symbol 501 or data symbol 502)"

[1107] "All symbols of all carriers at time $11 (pilot symbol 501 or data symbol 502)", omitting the records of other times and carriers.

[1108] Figure 13 It shows Figure 1 The transmission signal 108_A and Figure 4 The different frame configurations have been described in detail in Implementation 1, so the description is omitted here.

[1109] Figure 14 It shows Figure 1 The transmission signal 108_B and Figure 5 The different frame configurations have been described in detail in Implementation 1, so the description is omitted here.

[1110] exist Figure 13 The carrier A and time B contain code elements. Figure 14 When carrier A and time B contain code elements, Figure 13 The code elements of carrier A and time B are Figure 14 The symbols of carrier A and time B are transmitted at the same time and frequency. Additionally, Figure 13 and Figure 14 The frame structure shown is just one example.

[1111] and, Figure 13 and Figure 14 The other code elements in the text are equivalent to " Figure 22 The code elements of "preamble signal 252" and "control information code element signal 253" are therefore, in conjunction with... Figure 13 The other code elements 403 are from the same time and at the same frequency (same carrier). Figure 14 In the case of other code elements 503 transmitting control information, the same data (the same control information) is transmitted.

[1112] In addition, although the idea is Figure 13 Frames and Figure 14 The frames are received simultaneously by the receiving device, even if the receiving device receives Figure 13 frames or Figure 14 The frame receiving device can also receive the data sent by the sending device.

[1113] The phase-changing unit 209A takes the baseband signal 208A and the control signal 200 as inputs. It performs phase-changing on the baseband signal 208A according to the control signal 200, and outputs the phase-changed signal 210A. The baseband signal 208A is set as a function of symbol number i, denoted as x'(i). Thus, the phase-changed signal x(i)210A is expressed as x(i)=e j×ε(i) ×x'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[1114] Furthermore, the operation of the phase-changing unit 209A can also be that of the CDD / CSD described in Non-Patent Documents 2 and 3. The phase-changing unit 209A performs phase changes on symbols existing in the frequency axis direction. The phase-changing unit 209A performs phase changes on data symbols, pilot symbols, control information symbols, etc.

[1115] At this point, the null character can also be considered an object of phase change. Therefore, in this case, the code elements that become the object of code element number i are data code elements, pilot code elements, control information code elements, preamble (other code elements), null characters, etc.

[1116] However, since the in-phase component I of the empty character is zero (0) and the quadrature component Q is zero (0), even if the phase of the empty character is changed, the signal before the phase change is the same as the signal after the phase change.

[1117] Therefore, the null character can also be interpreted as not being an object of phase transition. Figure 22 In this case, since the phase change unit 209A performs phase change on the baseband signal 208A, therefore... Figure 13 The recorded symbols undergo phase changes.

[1118] Therefore, in Figure 13 In the frame, for time $1, all the symbols of all carriers (other symbols 403) are... Figure 22 The phase change unit 209A performs phase changes. However, the handling of the phase change of the null character 1301 is the same as previously described.

[1119] same, Figure 22 The phase-changing unit 209A performs phase changes for the following symbols.

[1120] "All symbols of all carriers at time $2 (other symbols 403)"

[1121] "All symbols of all carriers at time $3 (other symbols 403)"

[1122] "All symbols of all carriers at time $4 (other symbols 403)"

[1123] "All symbols of all carriers at time $5 (pilot symbol 401 or data symbol 402)".

[1124] "All symbols of all carriers at time $6 (pilot symbol 401 or data symbol 402)".

[1125] "All symbols of all carriers at time $7 (pilot symbol 401 or data symbol 402)".

[1126] "All symbols of all carriers at time $8 (pilot symbol 401 or data symbol 402)".

[1127] "All symbols of all carriers at time $9 (pilot symbol 401 or data symbol 402)".

[1128] "All symbols of all carriers at time $10 (pilot symbol 401 or data symbol 402)".

[1129] "All the symbols of all carriers at time $11 (pilot symbol 401 or data symbol 402)."

[1130] However, at all times and on all media, the handling of the phase change of the null character 1301 is the same as previously described. Descriptions of times and media other than those mentioned above are omitted.

[1131] The phase change value in the phase change unit 209A is represented by Ω(i). The baseband signal 208A is x'(i), and the phase-changed signal 210A is x(i). Therefore, x(i) = Ω(i) × x'(i) holds true.

[1132] For example, the value of the phase change can be set as in equation (38). Q is an integer greater than or equal to 2, and Q is the period of the phase change. j is the imaginary unit. However, equation (38) is only an example and is not limited thereto.

[1133] For example, Ω(i) could be set in a manner that uses a period Q to perform phase changes.

[1134] And, for example, it could be, in Figure 4 , Figure 13 In this approach, the same phase change value is applied to the same carrier, while phase change values ​​are set for each carrier individually. For example, the following settings are performed.

[1135] ·against Figure 4 , Figure 13 In carrier 1, the phase change value is set as in equation (39) in a way that is independent of time.

[1136] ·against Figure 4 , Figure 13 The carrier 2 in the middle sets the phase change value as Equation (40) in a way that is independent of time.

[1137] ·against Figure 4 , Figure 13 The carrier 3 in the middle sets the phase change value as Equation (41) in a way that is independent of time.

[1138] ·against Figure 4 , Figure 13 The carrier 4 in the middle sets the phase change value as Equation (42) in a way that is independent of time.

[1139] Descriptions of carriers other than those mentioned above are omitted.

[1140] The above is Figure 22 Example of operation of phase change unit 209A.

[1141] The phase-changing unit 209B takes the baseband signal 208B and the control signal 200 as inputs. It performs phase changing on the baseband signal 208B according to the control signal 200, and outputs the phase-changed signal 210B. The baseband signal 208B is used as a function of symbol number i, represented as y'(i). Thus, the phase-changed signal x(i)210B is represented as y(i)=e j×η(i) ×y'(i). i is an integer greater than or equal to 0, and j is the imaginary unit.

[1142] Furthermore, the operation of the phase-changing unit 209B can also be the CDD / CSD described in Non-Patent Documents 2 and 3. The phase-changing unit 209B performs phase changes on symbols present in the frequency axis direction. The phase-changing unit 209B performs phase changes on data symbols, pilot symbols, control information symbols, etc.

[1143] In this case, the null character can also be considered as an object of phase change. Therefore, in this situation, the code elements that become the object of code element number i are data code elements, pilot code elements, control information code elements, preamble (other code elements), null characters, etc.

[1144] However, since the in-phase component I of the null character is zero (0) and the quadrature component Q is zero (0), even if a phase shift is performed on the null character, the signal before the phase shift is the same as the signal after the phase shift. Therefore, the null character can be interpreted as not being an object of phase shifting. Figure 22 In this case, since the phase change unit 209B performs phase change on the baseband signal 208B, therefore, for Figure 14 The recorded symbols undergo phase changes.

[1145] Therefore, in Figure 14 In the frame, Figure 22 The phase-changing unit 209B performs phase changes for all symbols (other symbols 503) of all carriers at time $1. However, the phase change for the null character 1301 is the same as previously described.

[1146] same, Figure 22 The phase-changing unit 209B performs phase changes on the following symbols.

[1147] "All symbols of all carriers at time $2 (other symbols 503)"

[1148] "All symbols of all carriers at time $3 (other symbols 503)"

[1149] "All symbols of all carriers at time $4 (other symbols 503)"

[1150] "All symbols of all carriers at time $5 (pilot symbol 501 or data symbol 502)"

[1151] "All symbols of all carriers at time $6 (pilot symbol 501 or data symbol 502)"

[1152] "All symbols of all carriers at time $7 (pilot symbol 501 or data symbol 502)"

[1153] "All symbols of all carriers at time $8 (pilot symbol 501 or data symbol 502)"

[1154] "All symbols of all carriers at time $9 (pilot symbol 501 or data symbol 502)"

[1155] "All symbols of all carriers at time $10 (pilot symbol 501 or data symbol 502)"

[1156] "All symbols (pilot symbol 501 or data symbol 502) of all carriers at time $11", however, the phase change processing for the null character 1301 is the same as described above for all times and all carriers. Descriptions of times and carriers other than those mentioned above are omitted.

[1157] The phase change value in the phase change unit 209B is represented as Δ(i). The baseband signal 208B is y'(i), and the phase-changed signal 210B is y(i). Therefore, y(i) = Δ(i) × y'(i) holds true.

[1158] For example, the value of the phase change can be set as in equation (49). R is an integer greater than or equal to 2, and R is the period of the phase change. In addition, the values ​​of Q and R in equation (38) can be different.

[1159] For example, Δ(i) could be set in a way that uses a period R to perform phase changes.

[1160] And it can be, for example, in Figure 5 , Figure 14 The same phase change value is applied to the same carrier, while the phase change value is set according to each carrier.

[1161] For example, make the following settings.

[1162] ·against Figure 5 , Figure 14 In carrier 1, the phase change value is set as in equation (39) in a way that is independent of time.

[1163] ·against Figure 5 , Figure 14 The carrier 2 in the middle sets the phase change value as Equation (40) in a way that is independent of time.

[1164] ·against Figure 5 , Figure 14 The carrier 3 in the middle sets the phase change value as Equation (41) in a way that is independent of time.

[1165] ·against Figure 5 , Figure 14The carrier 4 in the middle sets the phase change value as Equation (42) in a way that is independent of time.

[1166] Descriptions of carriers other than those mentioned above are omitted.

[1167] The above is Figure 20 Example of operation of phase change unit 209B.

[1168] For passing Figure 22 The effects obtained by the phase change units 209A and 209B will be explained.

[1169] exist" Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The other code elements 403 and 503 of the "frame" include control information code elements. As described above, in the same time and at the same frequency (same carrier) as other code elements 403, Figure 5 In the case of other code elements 503 transmitting control information, the same data (the same control information) is sent.

[1170] However, as in scenario 2, it can be considered that "control information code elements, through..." Figure 1 The antenna section #A 109_A or antenna section #B 109_B is used to transmit.

[1171] In the transmission scenario shown in "Case 2", since the number of antennas transmitting control information symbols is 1, compared to the case where "control information symbols are transmitted using both antennas #A 109_A and #B 109_B", the spatial diversity gain is smaller. Therefore, in "Case 2", even... Figure 8 If the receiving device receives the data, the data reception quality will be reduced. Therefore, from the viewpoint of improving the data reception quality, it is preferable to "use both antenna section #A 109_A and antenna section #B 109_B to transmit control information symbols".

[1172] As in scenario 3, it can be considered that "control information code elements, through..." Figure 1 The antenna section #A 109_A and the antenna section #B 109_B transmit from both sides. However, in Figure 22 The phase change units 209A and 209B in the middle do not perform phase change.

[1173] In the transmission case shown in "Case 3", since the modulation signal transmitted from antenna #A 109_A is the same as or offset from the modulation signal transmitted from antenna #B 109_B by a specific phase, due to the propagation environment of the radio waves, Figure 8The receiving device may receive a very poor quality signal, and both modulated signals may be affected by the same multipath propagation. Therefore, in Figure 8 The receiving device exhibits a phenomenon of reduced data reception quality.

[1174] To mitigate this phenomenon, Figure 22 Phase changing units 209A and 209B are installed. Accordingly, since the phase is changed in the time or frequency direction, therefore... Figure 8 In the receiving device, the possibility of receiving a poor-quality signal can be reduced. Furthermore, since the modulated signal transmitted from antenna section #A 109_A is more likely to be affected by multipath effects than the modulated signal transmitted from antenna section #B 109_B, the possibility of obtaining diversity gain is also higher. Therefore, in Figure 8 The receiving device can improve the quality of data reception.

[1175] For the reasons mentioned above, Figure 22 Phase change units 209A and 209B are set up to perform phase change.

[1176] In addition to control information symbols, other symbols 403 and 503 also include symbols for demodulating and decoding control information symbols, such as symbols for signal detection, symbols for frequency and time synchronization, and symbols for channel estimation. Furthermore, in the… Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The frame includes pilot symbols 401 and 501. By utilizing these symbols, it is possible to demodulate and decode the control information symbols with higher accuracy.

[1177] Furthermore, in " Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14 The "frame" transmits multiple streams at the same frequency (band) and time using data symbols 402 and 502, or performs MIMO transmission. In order to demodulate these data symbols, symbols for signal detection, frequency synchronization and time synchronization, and channel estimation are included in other symbols 403 and 503.

[1178] At this time, the "symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation included in other symbols 403 and other symbols 503" are phase-changed by the phase-changing units 209A and 209B as previously described.

[1179] In this situation, if the processing is not reflected for data symbols 402 and 502 (in the case of the above description, for data symbol 402), when the receiving device demodulates and decodes data symbols 402 and 502, it needs to perform demodulation and decoding that reflects the phase change processing performed on the phase change unit 209A, so the processing is likely to become complicated.

[1180] This is because the "symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation contained in other symbols 403 and other symbols 503" are phase-changed by the phase-changing units 209A and 209B.

[1181] However, it has the following advantages, such as Figure 22 As shown, when the phase change units 209A and 209B perform phase changes on data symbols 402 and 502, the receiving device can easily demodulate and decode data symbols 402 and 502 by using the channel estimation signal (the estimated signal of the transport path variation) estimated by "symbols for signal detection, symbols for frequency synchronization and time synchronization, and symbols for channel estimation contained in other symbols 403 and other symbols 503".

[1182] And, as Figure 22 As shown, when the phase change units 209A and 209B perform phase change on data symbol 402 and data symbol 502, the effect of the sharp decrease in electric field strength on the frequency axis in the multipath can be reduced, thereby improving the reception quality of data symbol 402 and data symbol 502.

[1183] Thus, the difference between "becoming the object of the symbol for phase change by phase change units 205A and 205B" and "becoming the object of the symbol for phase change by phase change units 209A and 209B" becomes a feature point.

[1184] As described above, through the Figure 22 The phase-changing unit 205B performs phase changing, thereby obtaining data symbol 402 and data symbol 502. For example, in a LOS environment, this improves the data reception quality in the receiving device. Figure 22 The phase changing units 209A and 209B perform phase changing, for example, which can improve the " Figure 4 as well as Figure 5 "frame" or " Figure 13 as well as Figure 14The control information symbols contained in the frame are received in the receiving device to improve the reception quality, thereby simplifying the demodulation and decoding of data symbols 402 and 502.

[1185] In addition, through the Figure 22 The phase-changing units 205A and 205B perform phase changes, thereby improving the reception quality of data symbols 402 and 502 in the receiving device, for example, in a LOS environment. Furthermore, by adjusting the phase of data symbols 402 and 502... Figure 22 The phase-changing units 209A and 209B perform phase-changing, thereby improving the reception quality of data symbol 402 and data symbol 502.

[1186] Furthermore, Q in equation (38) can be an integer less than -2, in which case the period of phase change is the absolute value of Q. This also applies to implementation method 1.

[1187] Furthermore, R in equation (49) can be an integer less than -2, in which case the period of phase change is the absolute value of R.

[1188] Furthermore, considering the content explained in Supplement 1, the value of the cycle delay set in the phase change unit 209A can be different from the value of the cycle delay set in the phase change unit 209B.

[1189] (Implementation Method 7)

[1190] In this embodiment, a communication system utilizing the sending and receiving methods described in Embodiments 1 to 6 will be used as an example for explanation.

[1191] Figure 23 An example of a base station or access point configuration in this embodiment is shown.

[1192] The transmitting device 2303 takes data 2301, signal group 2302 and control signal 2309 as input, generates a modulation signal corresponding to data 2301 and signal group 2302, and transmits the modulation signal from the antenna.

[1193] At this time, as an example of the configuration of the transmitting device 2303, for example... Figure 1 As shown, data 2301 is equivalent to Figure 1 Data 101, signal group 2302 is equivalent to Figure 1 Signal group 110, control signal 2309 is equivalent to Figure 1 The control signal is 100.

[1194] The receiving device 2304 receives a modulated signal sent from the communication counterpart, such as a modulated signal sent from a terminal, performs signal processing, demodulation and decoding on the modulated signal, and outputs control information signal 2305 from the communication counterpart and received data 2306.

[1195] At this time, as an example of the configuration of the receiving device 2304, for example... Figure 8 As shown, receiving data 2306 is equivalent to Figure 8 The received data 812, and the control information signal 2305 from the communication partner are equivalent to Figure 8 The control signal 810.

[1196] The control signal generation unit 2308 takes the control information signal 2305 and the setting signal 2307 from the communication counterpart as input, and generates and outputs the control signal 2309 based on these signals.

[1197] Figure 24 It was shown as Figure 23 This is an example of the structure of a communication terminal between a base station and the other party.

[1198] The transmitting device 2403 takes data 2401, signal group 2402 and control signal 2409 as input, generates a modulation signal corresponding to data 2401 and signal group 2402, and transmits the modulation signal from the antenna.

[1199] At this time, as an example of the configuration of the transmitting device 2403, for example... Figure 1 As shown, data 2401 is equivalent to Figure 1 Data 101, signal group 2402 is equivalent to Figure 1 Signal group 110, control signal 2409 is equivalent to Figure 1 The control signal is 100.

[1200] The receiving device 2404 receives a modulated signal sent from the communication counterpart, such as a modulated signal sent from a base station, performs signal processing, demodulation and decoding on the modulated signal, and outputs a control information signal 2405 from the communication counterpart and received data 2406.

[1201] At this time, as an example of the configuration of the receiving device 2404, for example... Figure 8 As shown, receiving data 2406 is equivalent to Figure 8 The received data 812, and the control information signal 2405 from the communication partner are equivalent to Figure 8 The control signal 810.

[1202] The control signal generation unit 2408 takes the control information signal 2305 and the setting signal 2407 from the communication counterpart as input, and generates and outputs the control signal 2409 based on these signals.

[1203] Figure 25 Show Figure 24 This is an example of a frame of modulated signal transmitted by a terminal, with the horizontal axis representing time. The preamble 2501 is a symbol used by the communicating party (e.g., a base station) for signal detection, frequency synchronization, time synchronization, frequency offset estimation, and channel estimation; it may be a PSK symbol, for example. Furthermore, it may include training symbols for directional control. Although referred to here as a preamble, it may be called by other names.

[1204] Figure 25 Control information code element 2502 and data code element 2503 including data transmitted to the communication counterpart are shown.

[1205] The control information symbol 2502 includes, for example, information related to the method of error correction code used when generating data symbol 2503, such as code length (block length), coding rate, modulation scheme, and control information for notifying the other party.

[1206] in addition, Figure 25 This merely illustrates one example of frame composition and is not limited to this type of frame composition. Furthermore, Figure 25 The symbolic representation may also include other symbolic representations, such as pilot symbols or reference symbols. Furthermore, in Figure 25 The middle axis can be frequency, and symbols exist in the frequency axis direction (carrier direction).

[1207] Figure 23 An example of frames sent by a base station, for instance, using... Figure 4 , Figure 5 , Figure 13 , Figure 14 The description is the same, and detailed explanations are omitted here. Additionally, training symbols for directional control may be included in other symbols 403 and 503. Therefore, in this embodiment, the base station includes a case where multiple modulated signals are transmitted using multiple antennas.

[1208] The following provides a detailed explanation of the operation of the base station in the communication system described above.

[1209] Figure 23 The base station's transmitting device 2303 has Figure 1 Its composition. Furthermore, Figure 1 The signal processing unit 106 has Figure 2 , Figure 18 , Figure 19 , Figure 20 , Figure 21 , Figure 22 , Figure 28 , Figure 29 , Figure 30 , Figure 31 , Figure 32 , Figure 33 The composition shown in any of the diagrams. Additionally, regarding... Figure 28 , Figure 29 , Figure 30 , Figure 31 , Figure 32 , Figure 33 This will be explained later. At this time, the operation of phase changing units 205A and 205B can be switched according to the communication environment or settings. Furthermore, control information related to the operation of phase changing units 205A and 205B is used to illustrate the frame structure. Figure 4 , Figure 5 , Figure 13 , Figure 14 The other control information symbols 403 and 503 are part of the control information transmitted by the base station.

[1210] At this time, the control information related to the operation of phase change units 205A and 205B is set as u0 and u1. The relationship between [u0 u1] and phase change units 205A and 205B is shown in Table 1. In addition, u0 and u1 are sent by the base station as part of the control information symbols of other symbols 403 and 503. Furthermore, the terminal obtains [u0 u1] contained in the control information symbols of other symbols 403 and 503, and knows the operation of phase change units 205A and 205B based on [u0 u1], and performs demodulation and decoding of data symbols.

[1211] [Table 1]

[1212]

[1213] The explanation of Table 1 is as follows.

[1214] When the base station is set to "phase change units 205A and 205B do not perform phase change", it is set to "u0 = 0, u1 = 0". Therefore, phase change unit 205A does not perform phase change on the input signal (204A) and outputs signal 206A. Similarly, phase change unit 205B does not perform phase change on the input signal 204B and outputs signal 206B.

[1215] When the base station is set to "phase changing units 205A and 205B periodically / regularly change phase according to each symbol", it is set to "u0 = 0, u1 = 1". Furthermore, since the details of the method by which phase changing units 205A and 205B periodically / regularly change phase according to each symbol are the same as those in Embodiments 1 to 6, detailed descriptions are omitted here. Figure 1 The signal processing unit 106 has Figure 20 , Figure 21 , Figure 22 In any configuration case, when "phase change unit 205A performs phase change periodically / regularly according to each symbol, and phase change unit 205B performs phase change periodically / regularly according to each symbol" and "phase change unit 205A performs phase change periodically / regularly according to each symbol without performing phase change, and phase change unit 205B performs phase change periodically / regularly according to each symbol", it is also set to "u0=0, u1=1".

[1216] • When the base station is set to "phase change units 205A and 205B perform phase change with specific phase change values", it is set to "u0 = 1, u1 = 0". Here, "performing phase change with specific phase change values" will be explained.

[1217] For example, the phase change unit 205A performs a phase change with a specific phase change value. In this case, the input signal (204A) is set to z1(i), where i is the symbol number. Thus, in the case of "performing a phase change with a specific phase change value," the output signal 206A is represented as e. jα ×z1(i). α is a real number, representing a specific phase change value. The amplitude can be changed in this case, and the output signal 206A is represented as A×e. jα ×z1(i). A is a real number.

[1218] Similarly, the phase-changing unit 206A performs a phase change with a specific phase change value. At this time, the input signal 204B is set to z2(t), where i is the symbol number. Thus, in the case of "performing a phase change with a specific phase change value," the output signal 206B is represented as e. jβ ×z2(i). α is a real number, representing a specific phase change value. In this case, the amplitude can be changed, and the output signal 206B is represented as B×e. jβ ×z2(i).

[1219] B is a real number.

[1220] In addition, Figure 1 The signal processing unit 106 has Figure 20, Figure 21 , Figure 22 , Figure 31 , Figure 32 , Figure 33 In the case of any of the configurations shown in the figure, when "phase change unit 205A performs phase change with a specific phase change value, and phase change unit 205B does not perform phase change with a specific phase change value" and "phase change unit 205A is regarded as not performing phase change with a specific phase change value, and phase change unit 205B performs phase change with a specific phase change value", it is also set to "u0=1, u1=0".

[1221] Next, we will explain the method for setting a "specific phase change value" as an example. The first method and the second method will be explained below.

[1222] First method:

[1223] The base station transmits training symbols. The terminal, acting as the communication counterpart, uses these training symbols to send information about "specific phase change values ​​(groups)" to the base station. The base station then performs phase changes based on the "specific phase change values ​​(groups)" information received from the terminal.

[1224] Alternatively, the base station transmits training symbols. The terminal, acting as the communication counterpart, sends information related to the reception results of the training symbols (e.g., information related to channel estimation) to the base station. From the information obtained from the terminal regarding the reception results of the training symbols, the base station calculates the exact value of a specific set of phase change values ​​and performs phase changes.

[1225] Additionally, the base station needs to notify the terminal of information related to the set "specific phase change values ​​(groups)". In this case, through... Figure 4 , Figure 5 , Figure 13 , Figure 14 The other control information symbols in symbols 403 and 503 transmit information related to the set values ​​of "specific phase change values ​​(groups)" transmitted by the base station.

[1226] use Figure 26 An embodiment of the first method will be described. Figure 26 (A) shows the symbols transmitted by the base station on the time axis, with time on the horizontal axis. Furthermore, Figure 26 (B) shows the symbols in the timeline sent by the terminal, with the horizontal axis representing time.

[1227] The following are Figure 26 Let me explain in detail. First, the terminal requests communication from the base station.

[1228] In this way, the base station transmits at least one training symbol 2601 for estimating the specific phase change values ​​(groups) used by the base station to transmit data symbol 2604. Furthermore, the terminal can perform other estimations using the training symbol 2601, and the training symbol 2601 can, for example, employ PSK modulation. Also, the training symbol, like the pilot symbols described in Embodiments 1 to 6, is transmitted by multiple antennas.

[1229] The terminal receives training symbols 2601 sent from the base station, uses the training symbols 2601 to calculate the exact "specific phase change value (group)" performed by the phase change unit 205A and / or phase change unit 205B of the base station, and sends feedback information symbols 2602 including the calculated values.

[1230] The base station receives feedback information symbol 2602 sent from the terminal, demodulates and decodes the symbol to obtain the exact "specific phase change value (group)" information. Based on this information, the base station sets the phase change value (group) for phase change performed by the phase change unit 205A and / or the phase change unit 205B.

[1231] Furthermore, although the base station transmits control information symbol 2603 and data symbol 2604, at least data symbol 2604 is phase-changed by a set phase change value (group).

[1232] Furthermore, in data symbol 2604, as described in Embodiments 1 to 6, the base station transmits multiple modulated signals from multiple antennas. However, unlike Embodiments 1 to 6, in phase change unit 205A and / or phase change unit 205B, phase change is performed by the "specific phase change value (group)" described above.

[1233] Figure 26 The frame structure of the base station and terminal is just one example and may include other symbols. Furthermore, symbols such as training symbol 2601, feedback information symbol 2602, control information symbol 2603, and data symbol 2604 may include other symbols such as pilot symbols. Moreover, the control information symbol 2603 includes information related to the value of a "specific phase change value (group)" used when transmitting data symbol 2604. By obtaining this information, the terminal can demodulate and decode data symbol 2604.

[1234] Similar to the descriptions of Embodiments 1 to 6, for example, the base station... Figure 4 , Figure 5 , Figure 13 , Figure 14When transmitting a modulated signal using the frame configuration shown, the phase change performed by the phase change unit 205A and / or the phase change unit 205B described above, using "specific phase change values ​​(groups)," is converted into data symbols (402, 502). Furthermore, the symbols that are the targets of phase change performed by the phase change unit 209A and / or the phase change unit 209B are the same as those described in Embodiments 1 to 6, namely "pilot symbols 401, 501" and "other symbols 403, 503."

[1235] ...

Claims

1. A sending device, characterized in that: have: A signal processing circuit that performs phase change on a plurality of control information symbols by a cyclic shift diversity method, and performs first signal processing and second signal processing on a plurality of data symbols, thereby generating a plurality of streams; as well as a transmitter that transmits the plurality of streams via multiple antennas in a single carrier mode; In the first signal processing, the phase of the plurality of data symbols is changed according to a first phase change value that changes periodically; In the second signal processing, the phases of the plurality of data symbols are changed according to a plurality of second phase change values ​​that are provided to the plurality of streams respectively and that do not vary with time.

2. The transmitting device according to claim 1, wherein: The signal processing circuit inserts a plurality of pilot symbols into the plurality of streams after the first signal processing and before the second signal processing.

3. The transmitting device according to claim 1, wherein: The first phase change value of each stream changes periodically in the multiple streams according to a common period.

4. The transmitting device according to claim 1, wherein: The first phase change value of the multiple streams changes periodically in each cycle.

5. The transmitting device according to claim 1, wherein: The first phase change value is expressed as N is an integer greater than or equal to 2.

6. The transmitting device according to claim 1, wherein: At least one of the plurality of second phase change values ​​is e j×0×π 。 7. A sending method, which is a sending method performed by a sending device, characterized in that: The following steps are involved: A step of performing phase change on a plurality of control information symbols and performing first signal processing and second signal processing on a plurality of data symbols by a cyclic shift diversity method to generate a plurality of streams; and The step of transmitting the plurality of streams via multiple antennas in single carrier mode; In the first signal processing, the phase of the plurality of data symbols is changed according to a first phase change value that changes periodically; In the second signal processing, the phases of the plurality of data symbols are changed according to a plurality of second phase change values ​​that are provided to the plurality of streams respectively and that do not vary with time.

8. The sending method according to claim 7, wherein: After the first signal processing and before the second signal processing, a plurality of pilot symbols are inserted into the plurality of streams.

9. The sending method according to claim 7, wherein: The first phase change value of each stream changes periodically in the multiple streams according to a common period.

10. The sending method according to claim 7, wherein: The first phase change value of the multiple streams changes periodically in each cycle.

11. The sending method according to claim 7, wherein: The first phase change value is expressed as N is an integer greater than or equal to 2.

12. The sending method according to claim 7, wherein: At least one of the plurality of second phase change values ​​is e j×0×π .

Images