Transmission method and transmission device

Abstract

To improve the quality of data reception. [Solution] A transmission method comprising: using an OFDM scheme, allocating time and frequency resources to construct a frame, and transmitting the frame. The frame includes a first period in which a preamble containing control information is transmitted; a second period in which the first transmission data is transmitted but the second and third transmission data are not transmitted; and a third period in which the second and third transmission data are frequency-divided and transmitted. The control information includes information indicating the FFT size of the second period and the FFT size of the third period, and information indicating the allocation of time and frequency resources for each of the multiple transmission data transmitted in the second or third period. The FFT size of the second period and the FFT size of the third period are different.

Description

[Technical Field]

[0001] This disclosure relates to a transmission method, a reception method, a transmitting device, and a receiving device. [Background technology]

[0002] Traditionally, one communication method using multiple antennas is called MIMO (Multiple-Input Multiple-Output).

[0003] In multi-antenna communication, such as MIMO, one or more sequences of data are modulated, and each modulated signal is transmitted simultaneously from different antennas using the same frequency (common frequency). This improves the quality of data reception and / or increases the data communication speed (per unit time).

[0004] Figure 62 is a diagram illustrating the overview of the spatial multiplexing MIMO system. The MIMO system shown in the figure is an example of the configuration of a transceiver when there are 2 transmitting antennas (TX1, TX2), 2 receiving antennas (RX1, RX2), and 2 transmitted modulated signals (transmit streams).

[0005] The transmitting device comprises a signal generation unit and a wireless processing unit. The signal generation unit encodes the data in the communication channel, performs MIMO precoding, and generates two transmission signals z1(t) and z2(t) that can be transmitted simultaneously using the same frequency (common frequency). The wireless processing unit multiplexes each transmission signal in the frequency direction as needed, i.e., multi-carrier (for example, OFDM (Orthogonal Frequency Division Multiplexing) method), and also inserts a pilot signal for the receiving device to estimate transmission channel distortion, frequency offset, phase distortion, etc. (However, the pilot signal may be used to estimate other distortions, etc., and the receiving device may also use the pilot signal for signal detection. Note that the form in which the pilot signal is used by the receiving device is not limited to this.) The transmitting antenna transmits z1(t) and z2(t) using two antennas (TX1 and TX2).

[0006] The receiving device includes receiving antennas (RX1 and RX2), a radio processing unit, a channel variation estimation unit, and a signal processing unit. The receiving antenna (RX1) receives signals transmitted from the two transmitting antennas (TX1 and TX2) of the transmitting device. The channel variation estimation unit estimates the channel variation value using a pilot signal and supplies the estimated channel variation value to the signal processing unit. The signal processing unit reconstructs the data contained in z1(t) and z2(t) based on the signals received by the two receiving antennas and the estimated channel value, and obtains this as a single received data. However, the received data may be a hard decision value of "0" or "1", or a soft decision value such as the log-likelihood or log-likelihood ratio.

[0007] Furthermore, various encoding methods are used, such as turbo codes (e.g., Duo-Binary Turbo codes) and LDPC (Low-Density Parity-Check) codes (see Non-Patent Documents 1 to 6, etc.). [Prior art documents] [Non-patent literature]

[0008] [Non-Patent Document 1] RG Gallager, “Low-density parity-check codes,” IRE Trans. Inform. Theory, IT-8, pp-21-28, 1962. [Non-Patent Document 2] “Performance analysis and design optimization of LDPC-coded MIMO OFDM systems” IEEE Trans. Signal Processing., vol.52, no.2, pp.348-361, Feb. 2004. [Non-Patent Document 3] C. Douillard, and C. Berrou, “Turbo codes with rate-m / (m+1) constituent convolutional codes,” IEEE Trans. Commun., vol.53, no.10, pp.1630-1638, Oct. 2005. [Non-Patent Document 4] C. Berrou, “The ten-year-old turbo codes are entering into service”, IEEE Communication Magazine, vol.41, no.8,pp.110-116, Aug. 2003. [Non-Patent Document 5] DVB Document A122, Framing structure, channel coding and modulation for a second generation digital terrestrial television broadcasting system (DVB-T2), June 2008. [Non-Patent Document 6] DJC Mackay, “Good error-correcting codes based on very sparse matrices,” IEEE Trans. Inform. Theory, vol. 45, no. 2, pp 399 - 431, March 1999. [Non-Patent Document 7] SMAlamouti, “A simple transmit diversity technique for wireless communications,” IEEE J. Select. Areas Commun., vol.16, no.8, pp.1451-1458, Oct 1998. [Non-Patent Document 8] V. Tarokh, H. Jafrkhani, and ARCalderbank, “Space-time block coding for wireless communications: Performance results,” IEEE J. Select. Areas Commun., vol.17, no.3, no.3, pp.451―460, March 1999. [Overview of the project] [Means for solving the problem]

[0009] Transmission related to this disclosure The method involves sending multiple data symbols using multiple frame configurations. The method of transmission, Multiple frame configurations are, This document defines an assignment method for assigning each of the multiple subcarriers obtained by dividing a predetermined frequency band using Orthogonal Frequency-DivisionMultiplexing (OFDM) to each of the multiple data symbol groups. It is, Select one of the multiple frame configurations. and assigned to a predetermined frequency band two Data symbol group between to the selected Regarding frame configurationPlace and transmit a preamble symbol or a pilot symbol containing information, The information regarding the frame configuration indicates the selected frame configuration. A plurality of subcarriers obtained by dividing the entire predetermined frequency band to A plurality of data symbol groups Assignable frame configuration For, the number of subcarriers used by each data symbol group can be changed for each data symbol, group and Control information symbols are arranged on specific subcarriers in the frequency direction, and the control information symbols are related to any one of the plurality of data symbol groups assigned to the plurality of subcarriers, and indicate the initial position and the number of carriers used by the related data symbol group.

Effect of the Invention

[0010] According to the transmission device according to the present disclosure, when using the MIMO method, higher data reception quality can be obtained.

Brief Description of the Drawings

[0011] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of a transmission device. [Figure 2] FIG. 2 is a diagram showing an example of a frame configuration. [Figure 3] FIG. 3 is a diagram showing an example of a frame configuration. [Figure 4] FIG. 4 is a diagram showing an example of a frame configuration. [Figure 5] FIG. 5 is a diagram showing an example of a frame configuration. [Figure 6] FIG. 6 is a diagram showing an example of a frame configuration. [Figure 7] FIG. 7 is a diagram showing an example of the configuration when performing a transmission method using a space-time block code. [Figure 8] FIG. 8 is a diagram showing an example of the configuration when performing a transmission method using a space-time block code. [Figure 9] FIG. 9 is a diagram showing an example of the configuration when performing a transmission method using the MIMO method. [Figure 10] Figure 10 shows an example of a configuration when using a MIMO transmission method. [Figure 11] Figure 11 shows an example of a configuration when using a transmission method with MIMO. [Figure 12] Figure 12 shows an example of a configuration when using a MIMO transmission method. [Figure 13] Figure 13 shows an example of a configuration when using a MIMO transmission method. [Figure 14] Figure 14 shows an example of a configuration when using a MIMO transmission method. [Figure 15] Figure 15 shows an example of a configuration when using a MIMO transmission method. [Figure 16] Figure 16 shows an example of a configuration when using a MIMO transmission method. [Figure 17] Figure 17 shows an example of a configuration when using a MIMO transmission method. [Figure 18A] Figure 18A shows an example of how symbols can be arranged. [Figure 18B] Figure 18B shows an example of how symbols can be arranged. [Figure 19A] Figure 19A shows an example of how symbols can be arranged. [Figure 19B] Figure 19B shows an example of how symbols are arranged. [Figure 20A] Figure 20A shows an example of how symbols are arranged. [Figure 20B] Figure 20B shows an example of how symbols are arranged. [Figure 21A] Figure 21A shows an example of how symbols are arranged. [Figure 21B] Figure 21B shows an example of how symbols can be arranged. [Figure 22A] Figure 22A shows an example of how symbols can be arranged. [Figure 22B]Figure 22B shows an example of how symbols can be arranged. [Figure 23] Figure 23 shows an example of the configuration of a receiving device. [Figure 24] Figure 24 shows an example of a frame configuration. [Figure 25] Figure 25 shows an example of a frame configuration. [Figure 26] Figure 26 shows an example of a frame configuration. [Figure 27] Figure 27 shows an example of a frame configuration. [Figure 28] Figure 28 shows an example of a frame configuration. [Figure 29] Figure 29 shows an example of a frame configuration. [Figure 30] Figure 30 shows an example of a frame configuration. [Figure 31] Figure 31 shows an example of a frame configuration. [Figure 32] Figure 32 shows an example of a frame configuration. [Figure 33] Figure 33 shows an example of a frame configuration. [Figure 34] Figure 34 shows an example of a frame configuration. [Figure 35] Figure 35 shows an example of a frame configuration. [Figure 36] Figure 36 shows an example of a frame configuration. [Figure 37] Figure 37 shows an example of a frame configuration. [Figure 38] Figure 38 shows an example of a frame configuration. [Figure 39] Figure 39 shows an example of how symbols can be arranged. [Figure 40] Figure 40 shows an example of how symbols can be arranged. [Figure 41] Figure 41 shows an example of inserting a pilot symbol into a data symbol group. [Figure 42]Figure 42 shows an example of inserting a pilot symbol into a data symbol group. [Figure 43] Figure 43 shows an example of how symbols can be arranged. [Figure 44] Figure 44 shows an example of how symbols can be arranged. [Figure 45] Figure 45 shows an example of area resolution for frequency and time. [Figure 46] Figure 46 shows an example of how symbols can be arranged. [Figure 47] Figure 47 shows an example of area resolution for frequency and time. [Figure 48] Figure 48 shows an example of a frame configuration. [Figure 49] Figure 49 shows an example of how control symbols are arranged. [Figure 50] Figure 50 shows an example of a frame configuration. [Figure 51] Figure 51 shows an example of a frame configuration. [Figure 52] Figure 52 shows an example of a frame configuration. [Figure 53] Figure 53 shows an example of how control symbols are arranged. [Figure 54] Figure 54 shows an example of a frame configuration. [Figure 55A] Figure 55A shows an example of how symbols are arranged. [Figure 55B] Figure 55B shows an example of how symbols can be arranged. [Figure 56A] Figure 56A shows an example of how symbols are arranged. [Figure 56B] Figure 56B shows an example of how symbols can be arranged. [Figure 57] Figure 57 shows an example of the relationship between a transmitting station and a terminal. [Figure 58] Figure 58 shows an example of the configuration of a transmitting device. [Figure 59] Figure 59 shows an example of how symbols can be arranged. [Figure 60] Figure 60 shows an example of how symbols can be arranged. [Figure 61] Figure 61 shows an example of the configuration of a transmitting device. [Figure 62] Figure 62 is a schematic diagram of the MIMO system. [Modes for carrying out the invention]

[0012] (Embodiment 1) Figure 1 shows an example of the configuration of a transmitting device (for example, a broadcasting station) in this embodiment.

[0013] The data generation unit 102 receives the transmission data 10801 and the control signal 109 as input, and based on the error correction coding information, modulation scheme information, and other information contained in the control signal 109, performs error correction coding and mapping based on the modulation scheme, and outputs a (orthogonal) baseband signal 103 for data transmission.

[0014] The second preamble generation unit 105 receives the transmission data 104 for the second preamble and the control signal 109 as inputs. Based on the error correction information and modulation scheme information for the second preamble contained in the control signal 109, it performs error correction coding and mapping based on the modulation scheme and outputs the (orthogonal) baseband signal 106 for the second preamble.

[0015] The control signal generation unit 108 receives the transmission data 107 for the first preamble and the transmission data 104 for the second preamble as inputs, and generates the transmission method for each symbol (including the selected transmission method, which includes the error correction code, the coding rate of the error correction code, the modulation scheme, the block length, the frame configuration, the transmission method which involves regularly switching the precoding matrix, the pilot symbol insertion method, information on IFFT (Inverse Fast Fourier Transform) / FFT (Fast Fourier Transform), PAPR (Peak to Average Power Ratio) reduction, etc. The information (decreasing method information, guard interval insertion method information) is output as control signal 109.

[0016] The frame configuration unit 110 receives the (orthogonal) baseband signal 103 for data transmission, the (orthogonal) baseband signal 106 of the second preamble, and the control signal 109 as inputs. Based on the frame configuration information contained in the control signal, it rearranges the signals in the frequency and time axes and outputs the (orthogonal) baseband signal 111_1 for stream 1 (the mapped signal, i.e., the baseband signal based on the modulation scheme used) and the (orthogonal) baseband signal 111_2 for stream 2 (the mapped signal, i.e., the baseband signal based on the modulation scheme used), according to the frame configuration.

[0017] The signal processing unit 112 takes the baseband signal 111_1 of stream 1, the baseband signal 111_2 of stream 2, and the control signal 109 as inputs, and outputs a modulated signal 1 (113_1) and a modulated signal 2 (113_2) after signal processing, based on the transmission method included in the control signal 109.

[0018] The signal processing unit will use, for example, a MIMO transmission method using precoding and phase shifting (or a MIMO transmission method without phase shifting) (referred to here as the MIMO method), a MISO (Multiple-Input Single-Output) transmission method using spatiotemporal block codes (frequency-spatial block codes) (referred to here as the MISO method), or a SISO (Single-Input Single-Output) (or SIMO (Single-Input Multiple-Output)) transmission method in which the modulated signal of one stream is transmitted from one antenna (however, in the SISO and SIMO methods, the modulated signal of one stream may be transmitted from multiple antennas). The operation of the signal processing unit 112 will be explained in detail later.

[0019] The pilot insertion unit 114_1 receives the processed modulated signal 1(113_1) and the control signal 109 as inputs, and based on the information regarding the method of inserting pilot symbols included in the control signal 109, inserts pilot symbols into the processed modulated signal 1(113_1) and outputs the modulated signal 115_1 after pilot symbol insertion.

[0020] The pilot insertion unit 114_2 receives the processed modulated signal 2 (113_2) and the control signal 109 as inputs, and based on the information regarding the method of inserting pilot symbols included in the control signal 109, inserts pilot symbols into the processed modulated signal 2 (113_2) and outputs the modulated signal 115_2 after pilot symbol insertion.

[0021] The IFFT (Inverse Fast Fourier Transform) unit 116_1 receives the modulated signal 115_1 after pilot symbol insertion and the control signal 109 as inputs, performs an IFFT based on the IFFT method information contained in the control signal 109, and outputs the signal 117_1 after the IFFT.

[0022] The IFFT unit 116_2 receives the modulated signal 115_2 after pilot symbol insertion and the control signal 109 as inputs, performs an IFFT based on the IFFT method information contained in the control signal 109, and outputs the signal 117_2 after the IFFT.

[0023] The PAPR reduction unit 118_1 receives the IFFT-processed signal 117_1 and the control signal 109 as inputs. Based on the PAPR reduction information contained in the control signal 109, it processes the IFFT-processed signal 117_1 for PAPR reduction and outputs the PAPR-reduced signal 119_1.

[0024] The PAPR reduction unit 118_2 receives the IFFT-processed signal 117_2 and the control signal 109 as inputs. Based on the PAPR reduction information contained in the control signal 109, it processes the IFFT-processed signal 117_2 for PAPR reduction and outputs the PAPR-reduced signal 119_2.

[0025] The guard interval insertion unit 120_1 receives the PAPR-reduced signal 119_1 and the control signal 109 as inputs, and based on the information regarding the method of inserting the guard interval included in the control signal 109, inserts a guard interval into the PAPR-reduced signal 119_1 and outputs the guard interval-inserted signal 121_1.

[0026] The guard interval insertion unit 120_2 receives the PAPR-reduced signal 119_2 and the control signal 109 as inputs, and based on the information regarding the method of inserting the guard interval included in the control signal 109, inserts a guard interval into the PAPR-reduced signal 119_2 and outputs the signal 121_2 after the guard interval has been inserted.

[0027] The first preamble insertion unit 122 receives the signal 121_1 after guard interval insertion, the signal 121_2 after guard interval insertion, and the transmission data 107 for the first preamble. Then, the first preamble signal is generated from the transmission data 107 for the first preamble, the first preamble is added to the signal 121_1 after the guard interval insertion to output the signal 123_1 after the first preamble has been added, and the first preamble is added to the signal 121_2 after the guard interval insertion to output the signal 123_2 after the first preamble has been added. The first preamble signal may be added to both the signal 123_1 and the signal 123_2 after the first preamble has been added, or it may be added to only one of them. If it is added to only one of them, in the section where the added signal is present, the signal without the added signal will have a zero signal as a baseband signal.

[0028] The wireless processing unit 124_1 receives the signal 123_1 after the first preamble has been added as input, performs frequency conversion, amplification, and other processing, and outputs the transmission signal 125_1. The transmission signal 125_1 is then output as radio waves from the antenna 126_1.

[0029] The wireless processing unit 124_2 receives the signal 123_2, after the first preamble has been added, and performs processing such as frequency conversion and amplification to output the transmission signal 125_2. The transmission signal 125_2 is then output as radio waves from the antenna 126_2.

[0030] In this embodiment, as described above, the MIMO transmission method using precoding and phase shifting, the MISO (Multiple-Input Single-Output) transmission method using space-time block codes (or space-frequency block codes), and the SISO (Single-Input Single-Output) (or S The IMO (Single-Input Single-Output) transmission method will be used. (Details will be explained later.)

[0031] Figures 2 to 6 show examples of the frame configuration of the modulated signal transmitted by the transmitting device described above. The characteristics of each frame configuration will be explained below.

[0032] Figure 2 shows an example of the first frame configuration. In Figure 2, the vertical axis represents frequency and the horizontal axis represents time. Furthermore, since a multi-carrier transmission method such as OFDM is used, multiple carriers are assumed to exist on the vertical axis frequency.

[0033] In Figure 2, 201 represents the first preamble, 202 the second preamble, 203 data symbol group #1, 204 data symbol group #2, and 205 data symbol group #3.

[0034] First, let's explain the data symbol set.

[0035] A data symbol group may be assigned to each video / audio stream. For example, the symbol for transmitting the first video / audio stream could be data symbol group #1 (203), the symbol for transmitting the second video / audio stream could be data symbol group #2 (204), and the symbol for transmitting the third video / audio stream could be data symbol group #3 (205). This is not limited to Figure 2, but is also the case in Figures 3, 4, 5, and 6.

[0036] Furthermore, for example, the PLP (Physical Layer Pipe) in standards such as DVB-T2 (a second generation digital terrestrial television broadcasting system) may be referred to as a data symbol group. In other words, in Figure 2, data symbol group #1 (203) is called PLP# 1. Data symbol group #2 (204) may be named PLP#2, and data symbol group #3 (205) may be named PLP#3. This applies not only to Figure 2, but also to Figures 3, 4, 5, and 6.

[0037] The first preamble 201 and the second preamble 202 contain symbols for frequency synchronization and time synchronization (for example, PSK (Phase Shift Keying) symbols where the signal point arrangement in the common-phase I-orthogonal Q plane is known to the transceiver), and pilot symbols for the receiver to estimate channel fluctuations (for example, PSK (Phase Shift Keying) symbols where the signal point arrangement in the common-phase I-orthogonal Q plane is known to the transceiver). The symbols include: a keying symbol; a symbol for transmitting transmission method information for each data symbol group (information identifying SISO, MISO, or MIMO); a symbol for transmitting error correction code information for each data symbol group (e.g., code length, coding rate); a symbol for transmitting modulation scheme information for each data symbol (in the case of MISO or MIMO, multiple modulation schemes are specified because multiple streams exist); a symbol for transmitting transmission method information for the first and second preambles; a symbol for transmitting error correction code information for the first and second preambles; a symbol for transmitting modulation scheme information for the first and second preambles; a symbol for transmitting information on the pilot symbol insertion method; and a symbol for transmitting information on PAPR suppression method. This applies not only to Figure 2, but also to Figures 3, 4, 5, and 6.

[0038] A distinctive feature of Figure 2 is that the data symbol set is transmitted in a time-divided manner.

[0039] In Figure 2, the data symbol group may also include pilot symbols and symbols for transmitting control information. Furthermore, the data symbol group may be a symbol group based on MIMO (transmission) and MISO (transmission) methods (of course, the data symbol group may also be a symbol group based on the SISO (SIMO) method). In this case, multiple streams (s1, s2, which will be explained later) will be transmitted at the same time and on the same (common) frequency. (In this case, multiple modulated signals will be transmitted from multiple (different) antennas at the same time and on the same (common) frequency.) This point is not limited to Figure 2, but is also true in Figures 3, 4, 5, and 6.

[0040] Next, Figure 3 will be explained. Figure 3 shows an example of the second frame configuration. In Figure 3, the vertical axis represents frequency and the horizontal axis represents time. Furthermore, since a multi-carrier transmission method such as OFDM is used, multiple carriers are assumed to exist on the vertical axis frequency. Note that in Figure 3, elements identical to those in Figure 2 are given the same numbers and are assumed to operate in the same way as in Figure 2.

[0041] A notable feature in Figure 3 is the insertion of the first preamble 301 and the second preamble 302 between data symbol group #2 (204) and data symbol group #3 (205) in terms of time. In other words, when we name the symbol group formed by "first preamble, second preamble, data symbol group" as a group, there exists a first group (first preamble, second preamble, data symbol group #1, data symbol group #2) and a second group (first preamble, second preamble, data symbol group #3), and the composition of the data symbol groups included in the first group and the data symbol groups included in the second group are different.

[0042] In this case, for example, the video and audio transmitted using data symbol group #1 and the video and audio transmitted using data symbol group #2 may be treated as the same "video and audio" even though they have different compression ratios for video and audio encoding. In this case, the receiving device This method offers the advantage of obtaining the desired video and audio at high quality by simply selecting whether to demodulate data symbol group #1 or data symbol group #2. Furthermore, since the preamble can be standardized, the transmission efficiency of control information can be increased. (However, the video and audio transmitted using data symbol group #1 may differ from the video and audio transmitted using data symbol #2.)

[0043] Furthermore, it becomes easy to use the same transmission method for sending data symbol group #1 and the same transmission method for sending data symbol group #2, while making the transmission method for sending data symbol group #3 different from the transmission method for sending data symbol group #1 (and the transmission method for sending data symbol group #2). (As will be explained later, it is assumed that pilot symbols are inserted into the data symbol group. In this case, the method of inserting pilot symbols differs depending on the transmission method (because the number of modulated signals transmitted may differ). Therefore, grouping the data symbol group according to the transmission method may prevent a decrease in transmission efficiency due to the insertion of pilot symbols.)

[0044] Next, Figure 4 will be explained. Figure 4 shows an example of the third frame configuration. In Figure 4, the vertical axis represents frequency and the horizontal axis represents time. Furthermore, since a multi-carrier transmission method such as OFDM is used, multiple carriers are assumed to exist on the vertical axis frequency. Note that in Figure 4, components that operate the same way as in Figure 2 are given the same numbers and are assumed to operate the same way as in Figure 2.

[0045] A notable feature of Figure 4 is that data symbol groups #1 and #2 are frequency-division, and in addition, "data symbol group #1 (401_1) and data symbol group #2 (402)" and "data symbol group #3 (403)" are time-division. In other words, the data symbol groups are transmitted by using a combination of frequency division and time division.

[0046] Next, Figure 5 will be explained. Figure 5 shows an example of the fourth frame configuration. In Figure 5, the vertical axis represents frequency and the horizontal axis represents time. Furthermore, since a multi-carrier transmission method such as OFDM is used, multiple carriers are assumed to exist on the vertical axis frequency. Note that in Figure 5, components that operate in the same way as in Figures 2 and 4 are given the same numbers and are assumed to operate in the same way as in Figures 2 and 4.

[0047] A distinctive feature of Figure 5, similar to Figure 4, is that data symbol group #1 and data symbol group #2 are frequency-division, and in addition, "data symbol group #1 (401_1) and data symbol group #2 (402)" and "data symbol group #3 (403)" are time-division. In other words, the data symbol groups are transmitted by using a combination of frequency division and time division.

[0048] In addition, in Figure 5, the first preamble 301 and the second preamble 302 are inserted (temporarily) between "data symbol group #1 (401_1, 401_2) and data symbol #2 (402)" and data symbol group #3 (403). In other words, when we name the symbol group formed by "first preamble, second preamble, and data symbol group" as a group, there is a first group (first preamble, second preamble, data symbol group #1, data symbol group #2) and a second group (first preamble, second preamble, data symbol group #3), and the composition of the data symbol groups included in the first group and the data symbol groups included in the second group are different.

[0049] In this case, for example, the video and audio transmitted using data symbol group #1 and the video and audio transmitted using data symbol group #2 may have different compression ratios for encoding, but they can be considered the same "video and audio." This allows the receiving device to obtain the desired "video and audio" with high quality in a simple way—by selecting whether to demodulate data symbol group #1 or data symbol group #2—and also has the advantage of increasing the transmission efficiency of control information because the preamble can be shared. (However, the video and audio transmitted using data symbol group #1 may differ from the video and audio transmitted using data symbol #2.)

[0050] Furthermore, it becomes easy to use the same transmission method for sending data symbol group #1 and the same transmission method for sending data symbol group #2, while making the transmission method for sending data symbol group #3 different from the transmission method for sending data symbol group #1 (and the transmission method for sending data symbol group #2). (As will be explained later, it is assumed that pilot symbols are inserted into the data symbol group. In this case, the method of inserting pilot symbols differs depending on the transmission method (because the number of modulated signals transmitted may differ). Therefore, grouping the data symbol group according to the transmission method may prevent a decrease in transmission efficiency due to the insertion of pilot symbols.)

[0051] Next, Figure 6 will be explained. Figure 6 shows an example of the fifth frame configuration. In Figure 6, the vertical axis represents frequency and the horizontal axis represents time. Furthermore, since a multi-carrier transmission method such as OFDM is used, multiple carriers are assumed to exist on the vertical axis frequency. Note that in Figure 6, components that operate in the same way as in Figures 2 and 4 are given the same numbers and are assumed to operate in the same way as in Figures 2 and 4.

[0052] A distinctive feature of Figure 6, similar to Figures 4 and 5, is that data symbol group #1 and data symbol group #2 are frequency-division, and in addition, "data symbol group #1 (401_1) and data symbol group #2 (402)" and "data symbol group #3 (403)" are time-division. In other words, the data symbol groups are transmitted by using a combination of frequency division and time division.

[0053] In addition, in Figure 6, a pilot symbol is inserted between "data symbol group #1 (401_1, 401_2) and data symbol #2 (402)" and data symbol group #3 (403).

[0054] In this case, for example, the video and audio transmitted using data symbol group #1 and the video and audio transmitted using data symbol group #2 may have different compression ratios for encoding, but they can be considered the same "video and audio." This allows the receiving device to obtain the desired "video and audio" with high quality in a simple way—by selecting whether to demodulate data symbol group #1 or data symbol group #2—and also has the advantage of increasing the transmission efficiency of control information because the preamble can be shared. (However, the video and audio transmitted using data symbol group #1 may differ from the video and audio transmitted using data symbol #2.)

[0055] Furthermore, it becomes easy to use the same transmission method for sending data symbol group #1 and the same transmission method for sending data symbol group #2, while making the transmission method for sending data symbol group #3 different from the transmission method for sending data symbol group #1 (and the transmission method for sending data symbol group #2). (As will be explained later, it is assumed that pilot symbols are inserted into the data symbol group. In this case, the method of inserting pilot symbols differs depending on the transmission method (because the number of modulated signals transmitted may differ). Therefore, grouping the data symbol group according to the transmission method may prevent a decrease in transmission efficiency due to the insertion of pilot symbols.)

[0056] In the case of the MISO or MIMO system, a pilot symbol will be inserted into each modulated signal transmitted from each transmitting antenna.

[0057] Furthermore, by inserting the pilot symbol 601 as shown in Figure 6, the receiving device can perform channel estimation for detecting and demodulating each data symbol group with high accuracy. In addition, when the data symbol transmission method is switched, the receiving device must adjust the gain of the received signal to suit the transmission method, but the pilot symbol 601 provides the advantage of easily performing gain adjustment.

[0058] In Figures 4, 5, and 6, for example, the video and audio transmitted using data symbol group #1 and the video and audio transmitted using data symbol group #2 may be considered the same "video and audio" even though they have different compression ratios for encoding. This allows the receiving device to obtain the desired "video and audio" with high quality through a simple method of selecting whether to demodulate data symbol group #1 or data symbol group #2. Furthermore, this allows for the common use of the preamble, thus improving the transmission efficiency of control information. (However, the video and audio transmitted using data symbol group #1 may be different from the video and audio transmitted using data symbol #2.)

[0059] Figures 4, 5, and 6 show examples where time-division data symbols are placed after frequency-division data symbols. However, this is not the only option; frequency-division data symbols may also be placed after time-division data symbols. In this case, as shown in Figure 5, a first preamble and a second preamble are inserted between the time-division and frequency-division data symbols. (Other symbols may also be inserted.) As shown in Figure 6, a pilot symbol is inserted between the time-division and frequency-division data symbols. (Other symbols may also be inserted.)

[0060] The distinctive features of this embodiment will now be described.

[0061] As described above, each of the frame configurations shown in Figures 2 to 6 has its own advantages. Therefore, the transmitting device shall select one of the frame configurations shown in Figures 2 to 6 depending on the compression ratio and type of data (stream), the combination of transmission methods, and the type of service to be provided to the terminal, and transmit symbols such as control information, pilot symbols, and data symbols.

[0062] To achieve this, the transmitting device (Figure 1) may include "frame configuration information" in the first or second preamble to transmit information about the frame configuration to the receiving device (terminal).

[0063] For example, if three bits v0, v1, and v2 are assigned as "information about the frame configuration," and the transmitting device transmits a modulated signal with the frame configuration shown in Figure 2, then (v0, v1, v2) will be (0, 0, 0). The transmitting device then transmits "information regarding the frame configuration."

[0064] When the transmitting device transmits a modulated signal with the frame configuration shown in Figure 3, (v0,v1,v2) is set to (0,0,1) The transmitting device then transmits "information regarding the frame configuration."

[0065] When the transmitting device transmits a modulated signal with the frame configuration shown in Figure 4, (v0,v1,v2) is (0,1,0) The transmitting device then transmits "information regarding the frame configuration."

[0066] When the transmitting device transmits a modulated signal with the frame configuration shown in Figure 5, (v0,v1,v2) is (0,1,1) The transmitting device then transmits "information regarding the frame configuration."

[0067] When the transmitting device transmits a modulated signal with the frame configuration shown in Figure 5, (v0,v1,v2) is set to (1,0,0) The transmitting device then transmits "information regarding the frame configuration."

[0068] The receiving device can then obtain information about the frame configuration of the modulated signal transmitted by the transmitting device.

[0069] As explained above, data symbols can be in one of three formats: SISO (or SIMO), MISO, or MIMO. The following sections will focus specifically on the MISO and MIMO formats.

[0070] This document explains the MISO (transmission) method using spatiotemporal block coding (frequency-spatial block coding).

[0071] The configuration of the signal processing unit 112 in Figure 1 when using a transmission method with space-time block codes will be explained with reference to Figure 7.

[0072] The mapping unit 702 takes the data signal (data after error correction coding) 701 and the control signal 706 as inputs, performs mapping based on the information related to the modulation scheme contained in the control signal 706, and outputs the mapped signal 703. For example, the mapped signal 703 is arranged in the order of s0, s1, s2, s3,..., s(2i), s(2i+1),... (i is (These are non-negative integers.)

[0073] The MISO (Multiple Input Multiple Output) processing unit 704 takes the mapped signal 703 and the control signal 706 as inputs, and outputs the MISO processed signals 705A and 705B when the control signal 706 instructs it to transmit in the MISO format. For example, the MISO processed signal 705A will be s0, s1, s2, s3,..., s(2i), s(2i+1),..., and the MISO processed signal 705B will be -s1 * ,s0 * ,-s3 * s2 * ...,-s(2i+1) * ,s(2i) * ...and so . Also, * " means complex conjugate. (For example, s0 * (This is the complex conjugate of s0).

[0074] In this case, signals 705A and 705B after MISO processing correspond to modulated signal 1 (113_1) and modulated signal 2 (113_2) after signal processing in Figure 1, respectively. Note that the spatiotemporal block coding method is not limited to the one described above.

[0075] Then, the modulated signal 1(113_1) after signal processing is subjected to predetermined processing and transmitted as radio waves from antenna 126_1. Similarly, the modulated signal 1(113_2) after signal processing is subjected to predetermined processing and transmitted as radio waves from antenna 126_2.

[0076] FIG. 8 shows a configuration in the case of performing a transmission method using space-time block codes different from those in FIG. 7.

[0077] The mapping unit 702 takes as inputs a data signal (data after error correction coding) 701 and a control signal 7 06, performs mapping based on the information related to the modulation method included in the control signal 706, and outputs a mapped signal 703. For example, assume that the mapped signal 703 is arranged in the order of s0, s1, s2, s3, ···, s(2i), s(2i + 1), ···. (i is , an integer greater than or equal to 0).

[0078] The MISO (Multiple Input Multiple Output) processing unit 704 takes as inputs the mapped signal 703 and the control signal 706, and outputs MISO-processed signals 705A and 705B when the control signal 706 instructs to transmit in the MISO mode. For example, the MISO-processed signal 705A becomes s0, -s1*, s2, -s3*, ···, s(2i), -s(2i + 1) *, ··· and the MISO-processed signal 705B becomes s1, s0*, s3, s2* ···, s(2i + 1), s(2i)*, ···. Note that " * " means complex conjugate. (For example, s0 * is the complex conjugate of s0).

[0079] At this time, the MISO-processed signals 705A and 705B respectively correspond to the modulated signal 1 (113_1) after signal processing and the modulated signal 2 (113_2) after signal processing in FIG. 1. Note that the method of space-time block codes is not limited to the above description.

[0080] Then, the modulated signal 1 (113_1) after signal processing is subjected to predetermined processing and transmitted as radio waves from the antenna 126_1. Also, the modulated signal 1 (113_2) after signal processing is subjected to predetermined processing and transmitted as radio waves from the antenna 126_2.

[0081] Next, as an example of a MIMO system, we will describe a MIMO system that applies precoding, phase shifting, and power shifting. (However, this is not the only method for transmitting multiple streams from multiple antennas; this embodiment can be implemented with other systems as well.)

[0082] The configuration of the signal processing unit 112 in Figure 1 when using the MIMO transmission method will be explained using Figures 9 to 17.

[0083] The encoding unit 1102 in Figure 9 receives information 1101 and control signal 1112 as input, performs encoding based on the coding rate and code length (block length) information contained in the control signal 1112, and outputs encoded data 1103.

[0084] The mapping unit 1104 receives the encoded data 1103 and the control signal 1112 as input. The control signal 1112 specifies that two streams should be transmitted as the transmission method. In addition, the control signal 1112 specifies modulation methods α and β for the two streams. Modulation method α modulates x bits of data, and modulation method β modulates y bits of data. (For example, 16QAM (16 Quadrature Amplitude Modulation) modulates 4 bits of data, and 64QAM (64 Quadrature Amplitude Modulation) modulates 6 bits of data).

[0085] Then, the mapping unit 1104 modulates the x bits of data (x+y bits) using modulation scheme α to generate and output the baseband signal s1(t) (1105A), and modulates the remaining y bits of data using modulation scheme β to output the baseband signal s2(t) (1105B). (Note that in Figure 9, there is only one mapping unit, but in an alternative configuration, there may be separate mapping units for generating s1(t) and s2(t). In this case, the encoded data 1103 will be distributed between the mapping unit for generating s1(t) and the mapping unit for generating s2(t)).

[0086] Note that s1(t) and s2(t) are expressed as complex numbers (they can be either complex or real numbers), and t is time. Furthermore, when using a multi-carrier transmission method such as OFDM (Orthogonal Frequency Division Multiplexing), s1 and s2 can also be considered as functions of frequency f, as in s1(f) and s2(f), or as functions of time t and frequency f, as in s1(t,f) and s2(t,f).

[0087] In the following sections, the baseband signal, precoding matrix, phase shift, etc., are described as functions of time t, but they can also be considered as functions of frequency f, or as functions of both time t and frequency f.

[0088] Therefore, although the baseband signal, precoding matrix, phase shift, etc. are sometimes explained as functions of symbol number i, in this case they can be considered as functions of time t, functions of frequency f, and functions of both time t and frequency f. In other words, the symbol and baseband signals may be generated and arranged in the time axis direction, or in the frequency axis direction. Furthermore, the symbol and baseband signals may be generated and arranged in both the time axis and the frequency axis directions.

[0089] The power change unit 1106A (power adjustment unit 1106A) receives the baseband signal s1(t) (1105A) and the control signal 1112 as inputs. Based on the control signal 1112, it sets a real number P1 and outputs P1 × s1(t) as the power-changed signal 1107A. (Although P1 is shown as a real number, it may also be a complex number).

[0090] Similarly, the power change unit 1106B (power adjustment unit 1106B) receives the baseband signal s2(t) (1105B) and the control signal 512 as inputs, sets a real number P2, and outputs P2 × s2(t) as the power-changed signal 1107B. (Note that although P2 is a real number, it may also be a complex number).

[0091] The weighted synthesis unit 1108 takes the power-changed signal 1107A, the power-changed signal 1107B, and the control signal 1112 as inputs and sets the precoding matrix F (or F(i)) based on the control signal 1112. If the slot number (symbol number) is i, the weighted synthesis unit 1108 performs the following calculations.

[0092]

number

[0093] Here, a(i), b(i), c(i), and d(i) can be expressed as complex numbers (they may also be real numbers), and at least three of a(i), b(i), c(i), and d(i) must not be zero. The precoding matrix may or may not be a function of i. When the precoding matrix is ​​a function of i, it will be switched according to the slot number (symbol number).

[0094] Then, the weighted synthesis unit 1108 outputs u1(i) in equation (1) as the weighted synthesis signal 1109A, and u2(i) in equation (1) as the weighted synthesis signal 11 Output as 09B.

[0095] The power change unit 1110A receives the weighted combined signal 1109A(u1(i)) and the control signal 512 as inputs, sets a real number Q1 based on the control signal 1112, and outputs Q1 × u1(t) as the power-changed signal 1111A(z1(i)). (Although Q1 is shown as a real number, it may also be a complex number.)

[0096] Similarly, the power change unit 1110B receives the weighted combined signal 1109B(u2(i)) and the control signal 1112 as inputs, sets the real number Q2 based on the control signal 512, and outputs Q2 × u2(t) as the power-changed signal 1111B(z2(i)). (Note that although Q2 is a real number, it may also be a complex number.)

[0097] Therefore, the following equation holds true.

[0098]

number

[0099] Next, we will explain the transmission method for transmitting two different streams than those shown in Figure 9, using Figure 10. In Figure 10, components that operate similarly to those in Figure 9 are denoted by the same reference numerals.

[0100] The phase shifting unit 1161 takes the signal 1109B after weighting and combining u2(i) in equation (1) and the control signal 1112 as inputs, and changes the phase of the signal 1109B after weighting and combining u2(i) in equation (1) based on the control signal 1112. Therefore, the signal after changing the phase of the signal 1109B after weighting and combining u2(i) in equation (1) is e jθ(i) It is written as ×u2(i), e jθ(i) The phase-shifting unit 1161 outputs ×u2(i) as the phase-shifted signal 1162 (where j is the imaginary unit). A distinctive feature is that the value of the phase to be shifted is a function of i, such as θ(i).

[0101] Then, the power conversion units 1110A and 1110B in Figure 10 perform power conversion of the input signal, respectively. Therefore, the outputs z1(i) and z2(i) of the power conversion units 1110A and 1110B in Figure 10 are expressed by the following equations.

[0102]

number

[0103] Furthermore, Figure 11 shows a configuration different from that in Figure 10 as a way to realize equation (3). The difference between Figure 10 and Figure 11 is that the order of the power changing section and the phase changing section is reversed. (The functions themselves, such as changing power and changing phase, remain unchanged.) In this case, z1(i) and z2(i) are expressed as follows.

[0104]

number

[0105] In equations (3) and (4), if the phase value to be changed, θ(i+1) - θ(i), is set to a fixed value, for example, the receiving device is likely to obtain good data reception quality in a radio wave propagation environment where direct waves are dominant. However, the way in which the phase value to be changed, θ(i), is given is not limited to this example.

[0106] Figures 9 to 11 illustrate the case where some (or all) of the power conversion section is present, but it is also possible that some of the power conversion section is absent.

[0107] For example, in Figure 9, if the power change unit 1106A (power adjustment unit 1106A) and the power change unit 1106B (power adjustment unit 1106B) are not present, z1(i) and z2(i) are expressed as follows.

[0108]

number

[0109] Furthermore, in Figure 9, if the power change unit 1110A (power adjustment unit 1110A) and the power change unit 1110B (power adjustment unit 1110B) are not present, z1(i) and z2(i) are expressed as follows.

[0110]

number

[0111] Furthermore, in Figure 9, if the power change unit 1106A (power adjustment unit 1106A), power change unit 1106B (power adjustment unit 1106B), power change unit 1110A (power adjustment unit 1110A), and power change unit 1110B (power adjustment unit 1110B) are not present, z1(i) and z2(i) are expressed as follows.

[0112]

number

[0113] Furthermore, in Figure 10 or Figure 11, if the power change unit 1106A (power adjustment unit 1106A) and the power change unit 1106B (power adjustment unit 1106B) are not present, z1(i) and z2(i) are expressed as follows.

[0114]

number

[0115] Furthermore, in Figure 10 or Figure 11, if the power change unit 1110A (power adjustment unit 1110A) and the power change unit 1110B (power adjustment unit 1110B) are not present, z1(i) and z2(i) are expressed as follows.

[0116]

number

[0117] Furthermore, in Figure 10 or Figure 11, if the power change unit 1106A (power adjustment unit 1106A), power change unit 1106B (power adjustment unit 1106B), power change unit 1110A (power adjustment unit 1110A), and power change unit 1110B (power adjustment unit 1110B) are not present, z1(i) and z2(i) are expressed as follows.

[0118]

number

[0119] Next, we will discuss the transmission method when transmitting two different streams from those shown in Figures 9 and 11. This will be explained using Figure 12. In Figure 12, components that operate in the same way as in Figures 9 to 11 are given the same reference numerals, and their explanations are omitted.

[0120] A notable feature in Figure 12 is the insertion of the phase shifting unit 1151.

[0121] The phase change unit 1151 receives the baseband signal s2(i)(1105B) and the control signal 1112 as inputs, and changes the phase of the baseband signal s2(i)(1105B) based on the control signal 1112. At this time, the value of the phase change is e jλ(i) Let's assume this (where j is the imaginary unit). A notable feature is that the value of the phase being changed is a function of i, such as λ(i).

[0122] Then, considering the same principles as equations (1) through (10), the output signals z1(i) and z2(i) in Figure 12 can be expressed as follows:

[0123]

number

[0124] As a way to realize equation (11), there is a configuration different from that shown in Figure 12, in which the order of the power changing unit 1106B and the phase changing unit 1151 is reversed. (The functions of changing power and changing phase remain unchanged.) In this case, z1(i) and z2(i) are expressed as follows.

[0125]

number

[0126] Naturally, z1(i) in equation (11) and z1(i) in equation (12) are equal, and z2(i) in equation (11) and z2(i) in equation (12) are equal.

[0127] Figure 13 shows another configuration that can achieve the same processing as Figure 12. Note that in Figure 13, components that operate in the same way as in Figures 9 through 12 are given the same reference numerals, and their explanations are omitted. The difference between Figure 12 and Figure 13 is that in Figure 12, the order of the power conversion unit 1110B and the phase conversion unit 1161 is reversed in Figure 13. (The functions of power conversion and phase conversion themselves remain unchanged).

[0128] Then, considering the same principles as equations (1) through (12), the output signals z1(i) and z2(i) in Figure 13 can be expressed as follows:

[0129]

number

[0130] As a way to realize equation (13), there is a configuration different from that shown in Figure 13, in which the order of the power changing unit 1106B and the phase changing unit 1151 is reversed. (The functions of changing power and changing phase remain unchanged). In this case, z1(i) and z2(i) are expressed as follows.

[0131]

number

[0132] Naturally, z1(i) in equation (11) is equal to z1(i) in equation (12), z1(i) in equation (13) is equal to z1(i) in equation (14), and z2(i) in equation (11) is equal to z2(i) in equation (12), z2(i) in equation (13) is equal to z2(i) in equation (14).

[0133] Next, Figure 14 will be used to explain the transmission method when transmitting two different streams than those shown in Figures 9 through 13. In Figure 14, components that operate in the same way as in Figures 9 through 13 are given the same reference numerals, and their explanations are omitted.

[0134] In Figure 14, a notable feature is the insertion of phase shifting units 1181 and 1151.

[0135] The phase change unit 1151 receives the baseband signal s2(i)(1105B) and the control signal 1112 as inputs, and changes the phase of the baseband signal s2(i)(1105B) based on the control signal 1112. At this time, the value of the phase change is e jλ(i) Let's assume this (where j is the imaginary unit). A notable feature is that the value of the phase being changed is a function of i, such as λ(i).

[0136] Furthermore, the phase change unit 1181 receives the baseband signal s1(i)(1105A) and the control signal 1112 as inputs, and changes the phase of the baseband signal s1(i)(1105A) based on the control signal 1112. At this time, the value of the phase change is e jδ(i) Let's assume this (where j is the imaginary unit). A notable feature is that the value of the phase being changed is a function of i, such as δ(i).

[0137] Then, considering the same principles as equations (1) through (14), the output signals z1(i) and z2(i) in Figure 14 can be expressed as follows:

[0138]

number

[0139] As a way to realize equation (15), there is a configuration different from that shown in Figure 14 in which the order of the power changing unit 1106B and the phase changing unit 1151 is swapped, and the order of the power changing unit 1106A and the phase changing unit 1181 is swapped. (The functions of changing power and changing phase remain unchanged). In this case, z1(i) and z2(i) are expressed as shown in the following equations.

[0140]

number

[0141] Naturally, z1(i) in equation (15) and z1(i) in equation (16) are equal, and z2(i) in equation (15) and z2(i) in equation (16) are equal.

[0142] Figure 15 shows another configuration that can achieve the same processing as Figure 14. Note that in Figure 15, components that operate in the same way as in Figures 9 through 14 are given the same reference numerals, and their explanations are omitted. The difference between Figure 14 and Figure 15 is that in Figure 14, the order of the power conversion unit 1110B and the phase conversion unit 1161 is reversed in Figure 15. (The functions of power conversion and phase conversion themselves remain unchanged).

[0143] Then, considering the same principles as equations (1) through (16), the output signals z1(i) and z2(i) in Figure 15 can be expressed as follows:

[0144]

number

[0145] As a way to realize equation (17), there is a configuration different from that shown in Figure 15 in which the order of the power changing unit 1106B and the phase changing unit 1151 is swapped, and the order of the power changing unit 1106A and the phase changing unit 1181 is also swapped. (The functions of changing power and changing phase remain unchanged.) In this case, z1(i) and z2(i) are expressed as shown in the following equations.

[0146]

number

[0147] Naturally, z1(i) in equation (15) is equal to z1(i) in equation (16), z1(i) in equation (17) is equal to z1(i) in equation (18), and z2(i) in equation (15) is equal to z2(i) in equation (16), z2(i) in equation (17), and z2(i) in equation (18).

[0148] Next, Figure 16 will be used to explain the transmission method when transmitting two different streams than those shown in Figures 9 through 15. In Figure 16, components that operate similarly to those in Figures 9 through 15 are denoted by the same reference numerals, and their explanations are omitted.

[0149] In Figure 16, a notable feature is the insertion of phase shifting units 1181 and 1151, and phase shifting units 1110A and 1110B.

[0150] The phase change unit 1151 receives the baseband signal s2(i)(1105B) and the control signal 1112 as inputs, and changes the phase of the baseband signal s2(i)(1105B) based on the control signal 1112. At this time, the value of the phase change is e jλ(i) Let's assume this (where j is the imaginary unit). A notable feature is that the value of the phase being changed is a function of i, such as λ(i).

[0151] Furthermore, the phase change unit 1181 receives the baseband signal s1(i)(1105A) and the control signal 1112 as inputs, and changes the phase of the baseband signal s1(i)(1105A) based on the control signal 1112. At this time, the value of the phase change is e jδ(i) Let's assume this (where j is the imaginary unit). A notable feature is that the value of the phase being changed is a function of i, such as δ(i).

[0152] The phase shifting unit 1161 performs a phase shift on the input signal. Let the resulting phase shift value be θ(i). Similarly, the phase shifting unit 1191 performs a phase shift on the input signal. Let the resulting phase shift value be ω(i).

[0153] Then, considering the same principles as equations (1) through (18), the output signals z1(i) and z2(i) in Figure 16 can be expressed as follows:

[0154]

number

[0155] Furthermore, as a method to realize equation (19), a configuration different from that shown in Figure 16 is used, with power changing unit 1 There is a configuration in which the order of 106B and the phase change unit 1151 is swapped, and the order of the power change unit 1106A and the phase change unit 1181 is swapped. (The functions of changing power and changing phase remain unchanged.) In this case, z1(i) and z2(i) are expressed as follows.

[0156]

number

[0157] Naturally, z1(i) in equation (19) and z1(i) in equation (20) are equal, and z2(i) in equation (19) and z2(i) in equation (20) are equal.

[0158] Figure 17 shows another configuration that can achieve the same processing as Figure 16. Note that in Figure 17, components that operate in the same way as in Figures 9 through 16 are given the same reference numerals, and their explanation is omitted. The difference between Figure 16 and Figure 17 is that in Figure 14, the order of the power conversion unit 1110B and the phase conversion unit 1161 is swapped, and the order of the power conversion unit 1110A and the phase conversion unit 1191 is swapped in Figure 17. (The functions of power conversion and phase conversion themselves remain unchanged).

[0159] Then, considering the same principles as equations (1) through (20), the output signals z1(i) and z2(i) in Figure 17 can be expressed as follows:

[0160]

number

[0161] As a way to realize equation (21), there is a configuration different from that shown in Figure 17 in which the order of the power changing unit 1106B and the phase changing unit 1151 is swapped, and the order of the power changing unit 1106A and the phase changing unit 1181 is also swapped. (The functions of changing power and changing phase remain unchanged.) In this case, z1(i) and z2(i) are expressed as shown in the following equations.

[0162]

number

[0163] Naturally, z1(i) in equation (19) is equal to z1(i) in equation (20), z1(i) in equation (21) is equal to z1(i) in equation (22), and z2(i) in equation (19) is equal to z2(i) in equation (20), z2(i) in equation (21) is equal to z2(i) in equation (22).

[0164] Although the matrix F for weighted synthesis (precoding) is shown above, each embodiment of this specification can also be carried out using a precoding matrix F (or F(i)) as described below.

[0165]

number

[0166] or

[0167]

number

[0168] or

[0169]

number

[0170] or

[0171]

number

[0172] or

[0173]

number

[0174] or

[0175]

number

[0176] or

[0177]

number

[0178] or

[0179]

Number

[0180] In addition, in Formula (23), Formula (24), Formula (25), Formula (26), Formula (27), Formula (28), Formula (29), and Formula (30), α may be a real number or an imaginary number, and β may be a real number or an imaginary number. However, α is not zero. And β is also not zero. Or,

[0181]

Number

[0182] Or,

[0183]

Number

[0184] Or,

[0185]

Number

[0186] Or,

[0187]

Number

[0188] Or,

[0189]

Number

[0190] Or,

[0191]

Number

[0192] Or,

[0193]

Number

[0194] Or,

[0195]

Number

[0196] Note that in formula (31), formula (33), formula (35), and formula (37), β may be a real number or an imaginary number. However, β is not zero (0). Or,

[0197]

Number

[0198] Or,

[0199]

Number

[0200] Or,

[0201]

Number

[0202] Or,

[0203]

Number

[0204] Or,

[0205]

number

[0206] or

[0207]

number

[0208] or

[0209]

number

[0210] or

[0211]

number

[0212] or

[0213]

number

[0214] or

[0215]

number

[0216] or

[0217]

number

[0218] or

[0219]

number

[0220] However, θ 11 (i), θ 21 (i) λ(i) is a function of i (of time, frequency, or time-frequency), λ is a fixed value, α may be a real number or an imaginary number, and β may be a real number or an imaginary number, provided that α is not 0 (zero) and β is not 0 (zero).

[0221] or

[0222]

number

[0223] or

[0224]

number

[0225]

number

[0226] or

[0227]

number

[0228] or

[0229]

number

[0230] However, θ(i) is a function of i (of time, frequency, or time-frequency), and β may be a real number or an imaginary number, except that β is not 0 (zero).

[0231] Furthermore, each embodiment of this specification can be implemented using precoding matrices other than those specified.

[0232] In addition, the system may generate a modulated signal by precoding without performing the phase shift described above, and the transmitting device may then transmit the modulated signal. In this case, z1(i) and z2(i) can be expressed by the following equations.

[0233]

number

[0234]

number

[0235]

number

[0236]

number

[0237]

number

[0238] Then, z1(i) obtained from Figures 9 to 17 (or z1(i) of equation (56), or z1(i) of equation (57), or z1(i) of equation (58), or z1(i) of equation (59), or z1(i) of equation (60)) corresponds to 113_1 in Figure 1, and z2(i) obtained from Figures 9 to 17 (or z2(i) of equation (56), or z2(i) of equation (57), or z2(i) of equation (58), or z2(i) of equation (59), or z2(i) of equation (60)) corresponds to 113_2 in Figure 1.

[0239] Figures 18A to 22B show examples of arrangement methods for z1(i) and z2(i) generated in Figures 9 to 17.

[0240] Figure 18A shows the arrangement of z1(i), and Figure 18B shows the arrangement of z2(i). In Figures 18A and 18B, the vertical axis represents time, and the horizontal axis represents frequency.

[0241] Let's explain Figure 18A. First, when we generate z1(0), z1(1), z1(2), z1(3), ... corresponding to i=0, 1, 2, 3, ..., Place z1(0) as carrier 0 and time 1, Place z1(1) as carrier 1 and time 1, Place z1(2) on carrier 2 and time 1, ... Place z1(10) at carrier 0 and time 2, z1(11) is set as carrier 1 and time 2, Place z1(12) in carrier 2 and time 2, ... Let's assume that.

[0242] Similarly, in Figure 18B, when z2(0), z2(1), z2(2), z2(3), ... are generated corresponding to i=0, 1, 2, 3, ..., Place z2(0) as carrier 0 and time 1, Place z2(1) as carrier 1 and time 1, Place z2(2) on carrier 2 and time 1, ... Place z2(10) at carrier 0 and time 2, z2(11) is set as carrier 1 and time 2, Place z2(12) as carrier 2 and time 2, ... Let's assume that.

[0243] In this case, z1(a) and z2(a) when i=a are transmitted from the same frequency and at the same time. This will be believed. Figures 18A and 18B show examples of cases where the generated z1(i) and z2(i) are preferentially arranged along the frequency axis.

[0244] Figure 19A shows the arrangement of z1(i), and Figure 19B shows the arrangement of z2(i). In Figures 19A and 19B, the vertical axis represents time, and the horizontal axis represents frequency.

[0245] Let's explain Figure 19A. First, when we generate z1(0), z1(1), z1(2), z1(3), ... corresponding to i=0, 1, 2, 3, ..., Place z1(0) as carrier 0 and time 1, z1(1) is set as carrier 1 and time 2, Place z1(2) on carrier 2 and time 1, ... z1(10) is placed in carrier 2 and time 2, Place z1(11) on carrier 7 and time 1. Place z1(12) on carrier 8 and time 2. ... Let's assume that.

[0246] Similarly, in Figure 19B, when z2(0), z2(1), z2(2), z2(3), ... are generated corresponding to i=0, 1, 2, 3, ..., Place z2(0) as carrier 0 and time 1, Place z2(1) as carrier 1 and time 2, Place z2(2) on carrier 2 and time 1, ... Place z2(10) in carrier 2 and time 2, Place z2(11) on carrier 7 and time 1. Place z2(12) on carrier 8 and time 2, ... Let's assume that.

[0247] In this case, z1(a) and z2(a) when i=a will be transmitted from the same frequency and at the same time. Figures 19A and 19B show an example of arranging the generated z1(i) and z2(i) randomly along the frequency and time axes.

[0248] Figure 20A shows the arrangement of z1(i), and Figure 20B shows the arrangement of z2(i). In Figures 20A and 20B, the vertical axis represents time, and the horizontal axis represents frequency.

[0249] Let's explain Figure 20A. First, when we generate z1(0), z1(1), z1(2), z1(3), ... corresponding to i=0, 1, 2, 3, ..., Place z1(0) as carrier 0 and time 1, Place z1(1) on carrier 2 and time 1, Place z1(2) on carrier 4 and time 1, ... Place z1(10) at carrier 0 and time 2, Place z1(11) in carrier 2 and time 2, Place z1(12) on carrier 4 and time 2, ... Let's assume that.

[0250] Similarly, in Figure 20B, z²(0), z corresponds to i=0, 1, 2, 3, ... When 2(1), z2(2), z2(3), ... are generated, Place z2(0) as carrier 0 and time 1, Place z2(1) on carrier 2 and time 1, Place z2(2) on carrier 4 and time 1, ... Place z2(10) at carrier 0 and time 2, Place z2(11) in carrier 2 and time 2, Place z2(12) on carrier 4 and time 2, ... Let's assume that.

[0251] In this case, z1(a) and z2(a) when i=a will be transmitted from the same frequency and at the same time. Figures 20A and 20B show an example of arranging the generated z1(i) and z2(i) preferentially along the frequency axis.

[0252] Figure 21A shows the arrangement of z1(i), and Figure 21B shows the arrangement of z2(i). In Figures 21A and 21B, the vertical axis represents time, and the horizontal axis represents frequency.

[0253] Let's explain Figure 21A. First, when we generate z1(0), z1(1), z1(2), z1(3), ... corresponding to i=0, 1, 2, 3, ..., Place z1(0) as carrier 0 and time 1, Place z1(1) as carrier 1 and time 1, Place z1(2) at carrier 0 and time 2, ... z1(10) is placed in carrier 2 and time 2, Place z1(11) on carrier 3 and time 2, z1(12) is placed on carrier 2 and time 3, ... Let's assume that.

[0254] Similarly, in Figure 21B, when z2(0), z2(1), z2(2), z2(3), ... are generated corresponding to i=0, 1, 2, 3, ..., Place z2(0) as carrier 0 and time 1, Place z2(1) as carrier 1 and time 1, Place z2(2) at carrier 0 and time 2, ... Place z2(10) in carrier 2 and time 2, Place z2(11) on carrier 3 and time 2, Place z2(12) on carrier 2 and time 3, ... Let's assume that.

[0255] In this case, z1(a) and z2(a) when i=a will be transmitted from the same frequency and at the same time. Figures 21A and 21B show examples of arranging the generated z1(i) and z2(i) along the time-frequency axis.

[0256] Figure 22A shows the arrangement of z1(i), and Figure 22B shows the arrangement of z2(i). In Figures 22A and 22B, the vertical axis represents time, and the horizontal axis represents frequency.

[0257] Let's explain Figure 22A. First, z1(0) corresponds to i=0, 1, 2, 3, ... When z1(1), z1(2), z1(3), ... are generated, Place z1(0) as carrier 0 and time 1, Place z1(1) at carrier 0 and time 2, Place z1(2) at carrier 0 and time 3, ... z1(10) is placed on carrier 2 and time 3, z1(11) is placed on carrier 2 and time 4, Place z1(12) on carrier 3 and time 1. ... Let's assume that.

[0258] Similarly, in Figure 22B, when we generate z2(0), z2(1), z2(2), z2(3), ... corresponding to i=0, 1, 2, 3, ..., Place z2(0) as carrier 0 and time 1, Place z2(1) at carrier 0 and time 2, Place z2(2) at carrier 0 and time 3, ... Place z2(10) on carrier 2 and time 3, Place z2(11) on carrier 2 and time 4. Place z2(12) on carrier 3 and time 1. ... Let's assume that.

[0259] In this case, z1(a) and z2(a) when i=a will be transmitted from the same frequency and at the same time. Figures 22A and 22B show examples of how the generated z1(i) and z2(i) are arranged preferentially along the time axis.

[0260] The transmitting device may arrange symbols using any of the methods shown in Figures 18A to 22B, or any other symbol arrangement method. (Figures 18A to 22B are merely examples of symbol arrangement.)

[0261] Figure 23 shows an example configuration of a receiving device (terminal) that receives a modulated signal transmitted by the transmitting device shown in Figure 1.

[0262] In Figure 23, the OFDM-related processing unit 2303_X receives the received signal 2302_X from the antenna 2301_X as input, performs receiving-side signal processing for the OFDM method, and outputs the processed signal 2304_X. Similarly, the OFDM-related processing unit 2303_Y receives the received signal 2302_Y from the antenna 2301_Y as input, performs receiving-side signal processing for the OFDM method, and outputs the processed signal 2304_Y.

[0263] The first preamble detection and decoding unit 2311 receives the processed signals 2304_X and 2304_Y as input and detects the first preamble, thereby performing signal detection and time-frequency synchronization. At the same time, it obtains the control information contained in the first preamble (by demodulation and error-correction decoding) and outputs the first preamble control information 2312.

[0264] The second preamble demodulation unit 2313 receives the processed signals 2304_X and 2304_Y, and the first preamble control information 2312 as inputs, performs signal processing based on the first preamble control information 2312, performs demodulation (including error correction decoding), and outputs the second preamble control information 2314.

[0265] The control information generation unit 2315 takes the first preamble control information 2312 and the second preamble control information 2314 as input, bundles the control information (related to the receiving operation), and outputs it as a control signal 2316. The control signal 2316 is then input to each unit as shown in Figure 23.

[0266] The channel variation estimation unit 2305_1 for the modulated signal z1 takes the signal processed signal 2304_X and the control signal 2316 as inputs, estimates the channel variation between the antenna from which the transmitting device transmitted the modulated signal z1 and the receiving antenna 2301_X using pilot symbols and the like included in the signal processed signal 2304_X, and outputs a channel estimation signal 2306_1.

[0267] The channel variation estimation unit 2305_2 for the modulated signal z2 takes the signal processed signal 2304_X and the control signal 2316 as inputs, estimates the channel variation between the antenna from which the transmitting device transmitted the modulated signal z2 and the receiving antenna 2301_X using pilot symbols and the like included in the signal processed signal 2304_X, and outputs a channel estimation signal 2306_2.

[0268] The channel variation estimation unit 2307_1 for the modulated signal z1 takes the signal processed signal 2304_Y and the control signal 2316 as inputs, estimates the channel variation between the antenna from which the transmitting device transmitted the modulated signal z1 and the receiving antenna 2301_Y using pilot symbols and the like included in the signal processed signal 2304_Y, and outputs a channel estimation signal 2308_1.

[0269] The channel variation estimation unit 2307_2 for the modulated signal z2 takes the signal processed signal 2304_Y and the control signal 2316 as inputs, estimates the channel variation between the antenna from which the transmitting device transmitted the modulated signal z2 and the receiving antenna 2301_Y using pilot symbols and the like included in the signal processed signal 2304_Y, and outputs a channel estimation signal 2308_2.

[0270] The signal processing unit 2309 takes signals 2306_1, 2306_2, 2308_1, 2308_2, 2304_X, 2304_Y, and control signal 2316 as input. Based on the information contained in the control signal 2316, such as the transmission method, modulation method, error correction coding method, coding rate of the error correction coding, and block size of the error correction code, it performs demodulation and decoding and outputs the received data 2310. At this time, detection (demodulation) and decoding are performed based on the transmission method described above.

[0271] The receiving device will extract the necessary symbols from the control signal 2316 and perform demodulation (including signal separation and detection), error correction, and decoding. Furthermore, the configuration of the receiving device is not limited to this.

[0272] As described above, allowing the transmitting device to select one of the frame configurations shown in Figures 2 to 6 offers the advantage of providing flexible video information and flexible broadcast services to the receiving device (viewer). Furthermore, each frame configuration from Figures 2 to 6 has its own advantages as described above. Therefore, the transmitting device may use any of the frame configurations from Figures 2 to 6 individually, and in that case, it can obtain the effects described above.

[0273] Furthermore, when the transmitting device selects one of the frame configurations shown in Figures 2 to 6, for example, if the transmitting device is installed in a certain area, it may be possible to set one of the frame configurations from Figures 2 to 6 at the time of installation and then periodically review and switch between them, or it may be possible to select one of the frame configurations from Figures 2 to 6 for each frame transmission. Any method of selecting the frame configuration is acceptable.

[0274] Note that in the frame configurations shown in Figures 2 to 6, the first preamble contains other symbols (for example) Pilot symbols and null symbols (symbols with a homeomorphic component of 0 (zero), orthogonal component of 0 (zero)) may be inserted. Similarly, pilot symbols and null symbols (symbols with a homeomorphic component of 0 (zero), orthogonal component of 0 (zero))) may be inserted into the second preamble. Furthermore, although the preamble is composed of a first preamble and a second preamble, the configuration of the preamble is not limited to this, and it may be composed of only the first preamble (first group of preambles), or of two or more preambles (groups of preambles). The same applies to the configuration of the preamble when other embodiments of the frame configuration are shown.

[0275] Furthermore, while the frame configurations in Figures 2 to 6 show data symbols, other symbols (for example, pilot symbols, null symbols (symbols with a common-mode component of 0 (zero), orthogonal component of 0 (zero))), control information symbols, etc.) may be inserted. The same applies when showing frame configurations of other embodiments.

[0276] Furthermore, other symbols (for example, pilot symbols, null symbols (symbols with a common-mode component of 0 (zero), orthogonal component of 0 (zero))), control information symbols, data symbols, etc.) may be inserted in the pilot symbol shown in Figure 6. The same applies when showing the frame configuration of other embodiments.

[0277] (Embodiment 2) In Embodiment 1, we described the case where the transmitting device selects one of the frame configurations from Figure 2 to Figure 6 (or uses one of the frames from Figure 2 to Figure 6). In this embodiment, we will describe an example of the configuration method of the first preamble and the second preamble described in Embodiment 1, using the transmitting device described in Embodiment 1.

[0278] As described in Embodiment 1, the transmitting device (Figure 1) may transmit "frame configuration information" to the receiving device (terminal) in the first or second preamble to convey information about the frame configuration.

[0279] For example, if three bits v0, v1, and v2 are assigned as "information about the frame configuration," and the transmitting device transmits a modulated signal with the frame configuration shown in Figure 2, then (v0, v1, v2) will be (0, 0, 0). The transmitting device then transmits "information regarding the frame configuration."

[0280] When the transmitting device transmits a modulated signal with the frame configuration shown in Figure 3, (v0,v1,v2) is set to (0,0,1) The transmitting device then transmits "information regarding the frame configuration."

[0281] When the transmitting device transmits a modulated signal with the frame configuration shown in Figure 4, (v0,v1,v2) is (0,1,0) The transmitting device then transmits "information regarding the frame configuration."

[0282] When the transmitting device transmits a modulated signal with the frame configuration shown in Figure 5, (v0,v1,v2) is (0,1,1) The transmitting device then transmits "information regarding the frame configuration."

[0283] When the transmitting device transmits a modulated signal with the frame configuration shown in Figure 5, (v0,v1,v2) is set to (1,0,0) The transmitting device then transmits "information regarding the frame configuration."

[0284] The receiving device can learn about the general frame structure of the modulated signal transmitted by the transmitting device through "frame structure information."

[0285] Furthermore, the transmitting device (Figure 1) provides control information regarding the transmission method of each data symbol group, and each data The system transmits control information regarding the modulation scheme (or set of modulation schemes) of the data symbol group, the code length (block length) of the error correction code used in each data symbol group, and control information regarding the coding rate. It also transmits information regarding the configuration method of the data symbol group in each frame configuration. An example of how this control information is configured is described below.

[0286] If the transmitting device (Figure 1) selects the frame configuration shown in Figure 2 or Figure 3, that is, if it sets (v0,v1,v2) to (0,0,0) or (0,0,1) and transmits it, then the control information regarding the transmission method of data symbol group #j is a(j,0) and a(j,1).

[0287] In this case, if the transmission method for the data symbol group #(j=K) is single-stream transmission (SISO (SIMO) transmission), then a(K,0)=0 and a(K,1)=0 are set, and the transmitting device transmits a(K,0) and a(K,1).

[0288] The method for transmitting data symbol group #(j=K) is Space Time Block codes (or Space Frequency Block codes) (MI). When using SO transmission, a(K,0)=1 and a(K,1)=0 are set, and the transmitting device transmits a(K,0) and a(K,1).

[0289] When the transmission method for data symbol group #(j=K) is set to MIMO method #1, a(K,0)=0 and a(K,1)=1 are set, and the transmitting device transmits a(K,0) and a(K,1).

[0290] When the transmission method for data symbol group #(j=K) is set to MIMO method #2, a(K,0)=1 and a(K,1)=1 are set, and the transmitting device transmits a(K,0) and a(K,1).

[0291] Note that MIMO method #1 and MIMO method #2 are different methods, and the system must be one of the MIMO methods described above. Also, although MIMO method #1 and MIMO method #2 are discussed here, the transmitting device may select one MIMO method or two or more.

[0292] In Figures 2 and 3, data symbol group #1, data symbol group #2, and data symbol group #3 exist, so the transmitting device will transmit a(1,0), a(1,1), a(2,0), a(2,1), a(3,0), and a(3,1).

[0293] If the transmitting device (Figure 1) selects the frame configuration shown in Figure 2 or Figure 3, that is, if it sets (v0,v1,v2) to (0,0,0) or (0,0,1) and transmits it, then the control information regarding the modulation scheme of the data symbol group j is denoted as b(j,0) and b(j,1).

[0294] At this time, the following definition is made. If the transmission method is single-stream transmission (SISO (SIMO) transmission), for example, if a(K,0)=0 and a(K,1)=0 are set in data symbol #(j=K), When b(K,0)=0 and b(K,1)=0, the transmitter sets the data symbol modulation scheme to QPSK.

[0295] When b(K,0)=1 and b(K,1)=0, the transmitting device sets the data symbol modulation scheme to 16QAM.

[0296] When b(K,0)=0 and b(K,1)=1, the transmitting device modulates the data symbol. Set it to 64QAM.

[0297] When b(K,0)=1 and b(K,1)=1, the transmitting device sets the data symbol modulation scheme to 256QAM.

[0298] The transmission method is either Space Time Block codes (or Space Frequency Block codes) (MISO transmission), or MIMO. In the case of formula #1 or MIMO method #2, for example, if the data symbol #(j=K) is set to a(K,0)=1, a(K,1)=0, or a(K,0)=0, a(K,1)=1, or a(K,0)=1, a(K,1)=1, When b(K,0)=0 and b(K,1)=0, the transmitter sets the data symbol modulation scheme to QPSK for stream 1 and 16QAM for stream 2.

[0299] When b(K,0)=1 and b(K,1)=0, the transmitter sets the data symbol modulation scheme to 16QAM for stream 1 and 16QAM for stream 2.

[0300] When b(K,0)=0 and b(K,1)=1, the transmitter sets the data symbol modulation scheme to 16QAM for stream 1 and 64QAM for stream 2.

[0301] When b(K,0)=1 and b(K,1)=1, the transmitter sets the data symbol modulation scheme to 64QAM for stream 1 and 64QAM for stream 2.

[0302] Note that the modulation scheme is not limited to those mentioned above. For example, it may include modulation schemes such as APSK, non-uniform QAM, and non-uniform mapping. Further details about the modulation scheme will be explained later.

[0303] In Figures 2 and 3, data symbol group #1, data symbol group #2, and data symbol group #3 exist, so the transmitting device will transmit b(1,0), b(1,1), b(2,0), b(2,1), b(3,0), and b(3,1).

[0304] If the transmitting device (Figure 1) selects the frame configuration shown in Figure 2 or Figure 3, that is, if it sets (v0,v1,v2) to (0,0,0) or (0,0,1) and transmits it, then the control information regarding the encoding method of the error correction code for data symbol group #j is denoted as c(j,0) and c(j,1).

[0305] In this case, if the error correction encoding method for the data symbol group #(j=K) is set to A with an error correction code length of α, then c(K,0)=0 and c(K,1)=0, and the transmitting device will transmit c(K,0) and c(K,1).

[0306] When the error correction encoding method for the data symbol group #(j=K) is set to A for the error correction code and β for the code length, c(K,0)=1 and c(K,1)=0 are set, and the transmitting device transmits c(K,0) and c(K,1).

[0307] When the error correction encoding method for the data symbol group #(j=K) is set to B as the error correction code and α as the code length, c(K,0)=0 and c(K,1)=1 are set, and the transmitting device transmits c(K,0) and c(K,1).

[0308] When the error correction encoding method for the data symbol group #(j=K) is set to B as the error correction code and β as the code length, c(K,0)=1 and c(K,1)=1 are set, and the transmitting device transmits c(K,0) and c(K,1).

[0309] Furthermore, the setting of error correction codes is not limited to two; the transmitting device may be able to set one or more error correction codes. Similarly, the setting of code lengths is not limited to two; the transmitting device may be able to set two or more code lengths.

[0310] In Figures 2 and 3, since data symbol group #1, data symbol group #2, and data symbol group #3 exist, the transmitting device will transmit c(1,0), c(1,1), c(2,0), c(2,1), c(3,0), and c(3,1).

[0311] If the transmitting device (Figure 1) selects the frame configuration shown in Figure 2 or Figure 3, that is, if it sets (v0,v1,v2) to (0,0,0) or (0,0,1) and transmits the data, then the control information regarding the coding rate of the error correction code for data symbol group #j is denoted as d(j,0) and d(j,1).

[0312] In this case, if the coding rate of the error correction code for the data symbol group #(j=K) is set to 1 / 2, then d(K,0)=0 and d(K,1)=0 are set, and the transmitting device transmits d(K,0) and d(K,1).

[0313] If the coding rate of the error correction code for the data symbol group #(j=K) is set to 2 / 3, then d(K,0)=1 and d(K,1)=0 are set, and the transmitting device transmits d(K,0) and d(K,1).

[0314] If the coding rate of the error correction code for data symbol group #(j=K) is set to 3 / 4, then d(K,0)=0 and d(K,1)=1 are set, and the transmitting device transmits d(K,0) and d(K,1).

[0315] If the coding rate of the error correction code for the data symbol group #(j=K) is set to 4 / 5, then d(K,0)=1 and d(K,1)=1 are set, and the transmitting device transmits d(K,0) and d(K,1).

[0316] Furthermore, the coding rate settings for error correction codes are not limited to four; it is sufficient for the transmitting device to be able to set the coding rate for one or more types of error correction codes.

[0317] In Figures 2 and 3, data symbol group #1, data symbol group #2, and data symbol group #3 exist, so the transmitting device will transmit d(1,0), d(1,1), d(2,0), d(2,1), d(3,0), and d(3,1).

[0318] If the transmitting device (Figure 1) selects the frame configuration shown in Figure 2 or Figure 3, that is, if it sets (v0,v1,v2) to (0,0,0) or (0,0,1) and transmits the data, then the information regarding the number of symbols in the frame of data symbol group #j will be denoted as e(j,0) and e(j,1).

[0319] In this case, if the number of symbols in the frame of data symbol group #(j=K) is set to 256 symbols, then e(K,0)=0 and e(K,1)=0 are set, and the transmitting device transmits e(K,0) and e(K,1).

[0320] If the number of symbols in a frame of data symbol group #(j=K) is 512, then e(K,0)=1 and e(K,1)=0 are set, and the transmitting device transmits e(K,0) and e(K,1).

[0321] If the number of symbols in a frame of data symbol group #(j=K) is 1024 symbols, then e(K,0)=0 and e(K,1)=1 are set, and the transmitting device transmits e(K,0) and e(K,1).

[0322] If the number of symbols in the frame of data symbol group #(j=K) is 2048 symbols, then e(K,0)=1 and e(K,1)=1 are set, and the transmitting device transmits e(K,0) and e(K,1).

[0323] Furthermore, the number of symbols is not limited to four; it is sufficient for the transmitting device to be able to set one or more different numbers of symbols.

[0324] In Figures 2 and 3, data symbol group #1, data symbol group #2, and data symbol group #3 exist, so the transmitting device will transmit e(1,0), e(1,1), e(2,0), e(2,1), e(3,0), and e(3,1).

[0325] If the transmitting device (Figure 1) selects the frame configuration shown in Figure 4, Figure 5, or Figure 6, that is, if it sets (v0,v1,v2) to (0,1,0) or (0,1,1) or (1,0,0) and transmits, Let this be the case. At this time, the control information regarding the transmission method of data symbol group #j is a(j,0) and a(j,1).

[0326] In this case, if the transmission method for the data symbol group #(j=K) is single-stream transmission (SISO (SIMO) transmission), then a(K,0)=0 and a(K,1)=0 are set, and the transmitting device transmits a(K,0) and a(K,1).

[0327] The method for transmitting data symbol group #(j=K) is Space Time Block codes (or Space Frequency Block codes) (MI). When using SO transmission, a(K,0)=1 and a(K,1)=0 are set, and the transmitting device transmits a(K,0) and a(K,1).

[0328] When the transmission method for data symbol group #(j=K) is set to MIMO method #1, a(K,0)=0 and a(K,1)=1 are set, and the transmitting device transmits a(K,0) and a(K,1).

[0329] When the transmission method for data symbol group #(j=K) is set to MIMO method #2, a(K,0)=1 and a(K,1)=1 are set, and the transmitting device transmits a(K,0) and a(K,1).

[0330] Note that MIMO method #1 and MIMO method #2 are different methods, and the system must be one of the MIMO methods described above. Also, although MIMO method #1 and MIMO method #2 are discussed here, the transmitting device may select one MIMO method or two or more.

[0331] In Figures 4, 5, and 6, data symbol group #1, data symbol group #2, and data symbol group #3 exist, so the transmitting device will transmit a(1,0), a(1,1), a(2,0), a(2,1), a(3,0), and a(3,1).

[0332] If the transmitting device (Figure 1) selects the frame configuration shown in Figure 4, Figure 5, or Figure 6, that is, if it sets (v0,v1,v2) to (0,1,0) or (0,1,1) or (1,0,0) and transmits, Let this be the case. At this time, let b(j,0) and b(j,1) be the control information regarding the modulation scheme of the data symbol group j.

[0333] At this time, the following definition is made. If the transmission method is single-stream transmission (SISO (SIMO) transmission), for example, if a(K,0)=0 and a(K,1)=0 are set in data symbol #(j=K), When b(K,0)=0 and b(K,1)=0, the transmitter sets the data symbol modulation scheme to QPSK.

[0334] When b(K,0)=1 and b(K,1)=0, the transmitting device sets the data symbol modulation scheme to 16QAM.

[0335] When b(K,0)=0 and b(K,1)=1, the transmitting device sets the data symbol modulation scheme to 64QAM.

[0336] When b(K,0)=1 and b(K,1)=1, the transmitting device sets the data symbol modulation scheme to 256QAM.

[0337] The transmission method is either Space Time Block codes (or Space Frequency Block codes) (MISO transmission), or MIMO. In the case of formula #1 or MIMO method #2, for example, if the data symbol #(j=K) is set to a(K,0)=1, a(K,1)=0, or a(K,0)=0, a(K,1)=1, or a(K,0)=1, a(K,1)=1, When b(K,0)=0 and b(K,1)=0, the transmitter sets the data symbol modulation scheme to QPSK for stream 1 and 16QAM for stream 2.

[0338] When b(K,0)=1 and b(K,1)=0, the transmitter sets the data symbol modulation scheme to 16QAM for stream 1 and 16QAM for stream 2.

[0339] When b(K,0)=0 and b(K,1)=1, the transmitter sets the data symbol modulation scheme to 16QAM for Stream 1 and 64QAM for Stream 2.

[0340] When b(K,0)=1 and b(K,1)=1, the transmitter sets the data symbol modulation scheme to 64QAM for stream 1 and 64QAM for stream 2.

[0341] Note that the modulation scheme is not limited to those mentioned above. For example, it may include modulation schemes such as APSK, non-uniform QAM, and non-uniform mapping. Further details about the modulation scheme will be explained later.

[0342] In Figures 4, 5, and 6, data symbol group #1, data symbol group #2, and data symbol group #3 exist, so the transmitting device will transmit b(1,0), b(1,1), b(2,0), b(2,1), b(3,0), and b(3,1).

[0343] If the transmitting device (Figure 1) selects the frame configuration shown in Figure 4, Figure 5, or Figure 6, that is, if it sets (v0,v1,v2) to (0,1,0) or (0,1,1) or (1,0,0) and transmits, Let this be the case. At this time, let c(j,0) and c(j,1) be the control information regarding the encoding method of the error correction code for the data symbol group #j.

[0344] In this case, if the error correction encoding method for the data symbol group #(j=K) is set to A with an error correction code length of α, then c(K,0)=0 and c(K,1)=0, and the transmitting device will transmit c(K,0) and c(K,1).

[0345] When the error correction encoding method for the data symbol group #(j=K) is set to A for the error correction code and β for the code length, c(K,0)=1 and c(K,1)=0 are set, and the transmitting device transmits c(K,0) and c(K,1).

[0346] When the error correction encoding method for the data symbol group #(j=K) is set to B as the error correction code and α as the code length, c(K,0)=0 and c(K,1)=1 are set, and the transmitting device transmits c(K,0) and c(K,1).

[0347] When the error correction encoding method for the data symbol group #(j=K) is set to B as the error correction code and β as the code length, c(K,0)=1 and c(K,1)=1 are set, and the transmitting device transmits c(K,0) and c(K,1).

[0348] Furthermore, the setting of error correction codes is not limited to two; the transmitting device may be able to set one or more error correction codes. Similarly, the setting of code lengths is not limited to two; the transmitting device may be able to set two or more code lengths.

[0349] In Figures 4, 5, and 6, data symbol group #1, data symbol group #2, and data symbol group #3 exist, so the transmitting device will transmit c(1,0), c(1,1), c(2,0), c(2,1), c(3,0), and c(3,1).

[0350] If the transmitting device (Figure 1) selects the frame configuration shown in Figure 4, Figure 5, or Figure 6, that is, if it sets (v0,v1,v2) to (0,1,0) or (0,1,1) or (1,0,0) and transmits, Let this be the case. At this time, let d(j,0) and d(j,1) be the control information regarding the coding rate of the error correction code for data symbol group #j.

[0351] In this case, if the coding rate of the error correction code for the data symbol group #(j=K) is set to 1 / 2, then d(K,0)=0 and d(K,1)=0 are set, and the transmitting device transmits d(K,0) and d(K,1).

[0352] If the coding rate of the error correction code for the data symbol group #(j=K) is set to 2 / 3, then d(K,0)=1 and d(K,1)=0 are set, and the transmitting device transmits d(K,0) and d(K,1).

[0353] If the coding rate of the error correction code for data symbol group #(j=K) is set to 3 / 4, then d(K,0)=0 and d(K,1)=1 are set, and the transmitting device transmits d(K,0) and d(K,1).

[0354] If the coding rate of the error correction code for data symbol group #(j=K) is set to 4 / 5, then d(K,0)=1 and d(K,1)=1 are set, and the transmitting device transmits d(K,0) and d(K,1).

[0355] Furthermore, the coding rate settings for error correction codes are not limited to four; it is sufficient for the transmitting device to be able to set two or more coding rates for error correction codes.

[0356] In Figures 4, 5, and 6, data symbol group #1, data symbol group #2, and data symbol group #3 exist, so the transmitting device will transmit d(1,0), d(1,1), d(2,0), d(2,1), d(3,0), and d(3,1).

[0357] If the transmitting device (Figure 1) selects the frame configuration shown in Figure 4, Figure 5, or Figure 6, that is, if it sets (v0,v1,v2) to (0,1,0) or (0,1,1) or (1,0,0) and transmits, It shall be assumed that it has been done.

[0358] In this case, as shown in data symbol group #1 and data symbol group #2 of the frames in Figures 4, 5, and 6, if multiple data symbol groups are mixed within a certain time interval, it is assumed that the time interval can be set. (The unit time in a time interval in which multiple data symbol groups are mixed may be called an OFDM symbol.) Let f(0) and f(1) be the information regarding this time interval.

[0359] In this case, if this time interval is set to 128 OFDM symbols, f(0)=0 and f(1)=0 are set, and the transmitting device transmits f(0) and f(1).

[0360] If this time interval is set to 256 OFDM symbols, then f(0)=1 and f(1)=0 are set, and the transmitting device will transmit f(0) and f(1).

[0361] If this time interval is set to 512 OFDM symbols, then f(0)=0 and f(1)=1 are set, and the transmitting device will transmit f(0) and f(1).

[0362] If this time interval is set to 1024 OFDM symbols, then f(0)=1 and f(1)=0 are set, and the transmitting device will transmit f(0) and f(1).

[0363] Furthermore, the time interval settings are not limited to four; it is sufficient for the transmitting device to be able to set two or more different time intervals.

[0364] If the transmitting device (Figure 1) selects the frame configuration shown in Figure 4, Figure 5, or Figure 6, that is, if it sets (v0,v1,v2) to (0,1,0) or (0,1,1) or (1,0,0) and transmits, It shall be assumed that it has been done.

[0365] In this case, as shown in data symbol group #3 in Figure 4, or Figure 5, or Figure 6, if no other data symbol groups exist at a certain time interval (however, for example, if data symbol group #4 exists immediately after data symbol group #3, then in the portion where data symbol group #3 and data symbol group ## are adjacent, the data symbols of data symbol group #3 and data symbol group #4 may be mixed at a certain time interval), then the information regarding the number of symbols in the frame of data symbol group #j is denoted as e(j,0) and e(j,1).

[0366] If the number of symbols in a frame of data symbol group #(j=K) is 256, then e(K,0)=0 and e(K,1)=0 are set, and the transmitting device transmits e(K,0) and e(K,1).

[0367] If the number of symbols in a frame of data symbol group #(j=K) is 512, then e(K,0)=1 and e(K,1)=0 are set, and the transmitting device transmits e(K,0) and e(K,1).

[0368] If the number of symbols in a frame of data symbol group #(j=K) is 1024 symbols, then e(K,0)=0 and e(K,1)=1 are set, and the transmitting device transmits e(K,0) and e(K,1).

[0369] If the number of symbols in the frame of data symbol group #(j=K) is 2048 symbols, then e(K,0)=1 and e(K,1)=1 are set, and the transmitting device transmits e(K,0) and e(K,1).

[0370] Furthermore, the number of symbols is not limited to four; it is sufficient for the transmitting device to be able to set two or more different numbers of symbols.

[0371] In Figures 4, 5, and 6, data symbol group #3 corresponds to the above, so the transmitting device will transmit e(3,0) and e(3,1).

[0372] If the transmitting device (Figure 1) selects the frame configuration shown in Figure 4, Figure 5, or Figure 6, that is, if it sets (v0,v1,v2) to (0,1,0) or (0,1,1) or (1,0,0) and transmits, It shall be assumed that it has been done.

[0373] In this case, as shown in data symbol group #1 and data symbol group #2 of the frames in Figures 4, 5, and 6, if multiple data symbol groups are mixed within a certain time interval, it is possible to set the number of carriers used by each data symbol group.

[0374] In this case, let g(0) and g(1) be the information regarding the number of carriers. For example, let's assume the total number of carriers is 512.

[0375] If, of the two data symbol groups, the first data symbol group has 480 carriers and the second symbol group has 32 carriers, then g(0)=0 and g(1)=0 are set, and the transmitting device transmits g(0) and g(1).

[0376] If, of the two data symbol groups, the first data symbol group has 448 carriers and the second symbol group has 64 carriers, then g(0)=1 and g(1)=0 are set, and the transmitting device transmits g(0) and g(1).

[0377] If, of the two data symbol groups, the first data symbol group has 384 carriers and the second symbol group has 128 carriers, then g(0)=0 and g(1)=1 are set, and the transmitting device transmits g(0) and g(1).

[0378] If, among the two data symbol groups, the first data symbol group has 256 carriers and the second symbol group also has 256 carriers, then g(0)=1 and g(1)=1 are set, and the transmitting device transmits g(0) and g(1).

[0379] Note that the number of carriers is not limited to four; it is sufficient if the transmitting device can be configured to use two or more types of carriers.

[0380] As an example of a case where multiple data symbol groups are mixed within a certain time interval, Figures 4 to 6 illustrate the case where two data symbol groups are mixed, but it is also possible for three or more data symbol groups to be mixed. This point will be explained using Figures 24, 25, and 26.

[0381] Figure 24 shows an example of a frame configuration when three data symbol groups exist at a certain time interval, compared to Figure 4. Components that operate similarly to those in Figure 4 are given the same numbers, and their explanations are omitted.

[0382] In Figure 24, 2401 represents data symbol group #1, 2402 represents data symbol group #2, and 2403 represents data symbol group #4. Data symbol groups #1, #2, and #4 exist at a certain time interval.

[0383] Figure 25 shows an example of a frame configuration when three data symbol groups exist at a certain time interval, compared to Figure 5. Components that operate similarly to those in Figure 5 are given the same number, and their explanations are omitted.

[0384] In Figure 25, 2501 represents data symbol group #1, 2502 represents data symbol group #2, and 2503 represents data symbol group #5. Data symbol groups #1, #2, and #4 exist at a certain time interval.

[0385] Figure 26 shows an example of a frame configuration when three data symbol groups exist at a certain time interval, compared to Figure 6. Components that operate similarly to those in Figure 6 are given the same numbers, and their explanations are omitted.

[0386] In Figure 26, 2601 represents data symbol group #1, 2602 represents data symbol group #2, and 2603 represents data symbol group #4. Data symbol groups #1, #2, and #4 exist at a certain time interval.

[0387] The transmitting device in Figure 1 may be configured to allow selection of the frame configurations shown in Figures 24 to 26. Furthermore, for Figures 4 to 6 and Figures 24 to 26, the frame configuration may be such that four or more data symbol groups exist at a given time interval.

[0388] Figures 24, 25, and 26 show examples where time-division data symbols are placed after frequency-division data symbols. However, this is not the only option; frequency-division data symbols may also be placed after time-division data symbols. In this case, as shown in Figure 25, a first preamble and a second preamble are inserted between the time-division and frequency-division data symbols. (Other symbols may also be inserted.) As shown in Figure 26, a pilot symbol is inserted between the time-division and frequency-division data symbols. (Other symbols may also be inserted.)

[0389] When the transmitting device (Figure 1) transmits "frame configuration information" to the receiving device (terminal) in the first or second preamble, for example, if it assigns three bits v0, v1, and v2 as "frame configuration information," and the transmitting device transmits a modulated signal with the frame configuration shown in Figure 24, it sets (v0, v1, v2) to (1, 0, 1) and transmits "frame configuration information."

[0390] When the transmitting device transmits a modulated signal with the frame configuration shown in Figure 25, (v0,v1,v2) is set to (1,1,0 The transmitting device then transmits "information regarding the frame configuration".

[0391] When the transmitting device transmits a modulated signal with the frame configuration shown in Figure 26, (v0,v1,v2) is set to (1,1,1 The transmitting device then transmits "information regarding the frame configuration".

[0392] In Figures 24, 25, and 26, the data symbol sets may also be symbol sets based on MIMO (transmission) and MISO (transmission) methods (of course, the data symbol sets may also be symbol sets based on the SISO (SIMO) method). In this case, multiple streams (s1, s2, which will be explained later) will be transmitted at the same time and on the same (common) frequency. (In this case, multiple modulated signals will be transmitted from multiple (different) antennas at the same time and on the same (common) frequency).

[0393] Then, if the transmitting device (Figure 1) selects the frame configuration shown in Figure 24, or Figure 25, or Figure 26, that is, (v0,v1,v2) becomes (1,0,1) or (1,1,0) or (1,1,1) It is assumed that this setting has been configured and sent.

[0394] In this case, as shown in Figures 24, 25, and 26, when multiple data symbol groups are mixed together within a certain time interval, it is possible to set the number of carriers used by each data symbol group.

[0395] In this case, let g(0) and g(1) be the information regarding the number of carriers. For example, let's assume the total number of carriers is 512.

[0396] If, among the two data symbol groups, the first data symbol group has 448 carriers, the second symbol group has 32 carriers, and the third symbol group has 32 carriers, then g(0)=0 and g(1)=0 are set, and the transmitting device transmits g(0) and g(1).

[0397] If, among the two data symbol groups, the first data symbol group has 384 carriers, the second symbol group has 64 carriers, and the third symbol group has 64 carriers, then g(0)=1 and g(1)=0 are set, and the transmitting device transmits g(0) and g(1).

[0398] If, among the two data symbol groups, the first data symbol group has 256 carriers, the second symbol group has 128 carriers, and the third symbol group has 128 carriers, then g(0)=0 and g(1)=1 are set, and the transmitting device transmits g(0) and g(1).

[0399] If, among the two data symbol groups, the first data symbol group has 480 carriers, the second symbol group has 16 carriers, and the third symbol group has 16 carriers, then g(0)=1 and g(1)=1 are set, and the transmitting device transmits g(0) and g(1).

[0400] Note that the number of carriers is not limited to four; it is sufficient for the transmitting device to be able to configure one or more types of carriers.

[0401] Furthermore, as shown in Figures 4, 5, 6, 24, 25, and 26, in frames where "multiple data symbol groups are mixed in the first time interval" and "only one data symbol group exists in the second time interval," allowing the transmitting device to set the carrier interval (FFT (Fast Fourier Transform) size, or Fourier transform size) separately for "multiple data symbol groups are mixed in the first time interval" and for "only one data symbol group exists in the second time interval" can improve data transmission efficiency. This is because the appropriate carrier interval for data transmission efficiency in "multiple data symbol groups are mixed in the first time interval" is different from the appropriate carrier interval for data transmission efficiency in "only one data symbol group exists in the second time interval."

[0402] Therefore, the control information regarding the carrier interval for the case where "multiple data symbol groups are mixed in the first time interval" is denoted as ha(0) and ha(1).

[0403] In this case, if the carrier interval is 0.25 kHz, then ha(0) = 0, ha(1) = The setting is 0, and the transmitting device will send ha(0) and ha(1).

[0404] If the carrier interval is set to 0.5 kHz, then ha(0)=1 and ha(1)=0, and the transmitting device will transmit ha(0) and ha(1).

[0405] When the carrier interval is set to 1 kHz, ha(0) = 0 and ha(1) = 1, and the transmitting device will transmit ha(0) and ha(1).

[0406] When the carrier interval is set to 2 kHz, ha(0) = 1 and ha(1) = 1 are set, and the transmitting device transmits ha(0) and ha(1).

[0407] Furthermore, the number of carrier interval settings is not limited to four; it is sufficient for the transmitting device to be able to configure two or more types of carrier interval settings.

[0408] Then, hb(0) and hb(1) are the control information regarding the carrier interval for the case where "only one data symbol group exists in the second time interval."

[0409] In this case, if the carrier interval is set to 0.25 kHz, hb(0)=0 and hb(1)=0 are set, and the transmitting device will transmit hb(0) and hb(1).

[0410] If the carrier interval is set to 0.5 kHz, then hb(0)=1 and hb(1)=0, and the transmitting device will transmit hb(0) and hb(1).

[0411] If the carrier interval is set to 1 kHz, hb(0) = 0 and hb(1) = 1, and the transmitting device will transmit hb(0) and hb(1).

[0412] If the carrier interval is set to 2 kHz, hb(0) = 1 and hb(1) = 1 are set, and the transmitting device will transmit hb(0) and hb(1).

[0413] Furthermore, the number of carrier interval settings is not limited to four; it is sufficient for the transmitting device to be able to configure two or more types of carrier interval settings.

[0414] Here, the carrier interval settings are the same for both cases: "when multiple data symbol groups are mixed in the first time interval" and "when only one data symbol group exists in the second time interval." These settings are 0.25kHz, 0.5kHz, 1kHz, and 2kHz, respectively. However, the set of selectable settings for "when multiple data symbol groups are mixed in the first time interval" and "when only one data symbol group exists in the second time interval" may differ. For example, the carrier interval could be set to 0.25kHz, 0.5kHz, 1kHz, or 2kHz when "multiple data symbol groups are present in the first time interval," and to 0.125kHz, 0.25kHz, 0.5kHz, or 1kHz when "only one data symbol group exists in the second time interval." (The possible values ​​are not limited to this example.)

[0415] Furthermore, control information regarding the carrier interval for the case where "multiple data symbol groups are mixed in the first time interval" is provided as ha(0) and ha(1), and control information regarding the carrier interval for the case where "only one data symbol group exists in the second time interval" is provided as ha(0) and ha(1). The control information hb(0) and hb(1) can be transmitted in either the first or second preamble, as shown in Figures 4, 5, 6, 24, 25, and 26.

[0416] For example, in Figures 4, 6, 24, and 26, one possible method is to transmit control information regarding the carrier interval ha(0) and ha(1) for the case where "multiple data symbol groups are mixed in the first time interval," and control information regarding the carrier interval hb(0) and hb(1) for the case where "only one data symbol group exists in the second time interval," in the first preamble 201 or the second preamble 202.

[0417] Figures 5 and 25 show two possible methods for transmitting control information regarding the carrier interval in the case where "multiple data symbol groups are mixed in the first time interval": ha(0) and ha(1) in the first preamble 201 or the second preamble 202; and control information regarding the carrier interval in the case where "only one data symbol group exists in the second time interval": hb(0) and hb(1) in the first preamble 501 or the second preamble 502.

[0418] Alternatively, as shown in Figures 5 and 25, control information regarding the carrier interval for the case where "multiple data symbol groups are mixed in the first time interval" is transmitted as ha(0) and ha(1), and control information regarding the carrier interval for the case where "only one data symbol group exists in the second time interval" is transmitted as hb(0) and hb(1) in "the first preamble 201 or the second preamble 202" and "the first preamble 501 or the second preamble 502," thereby transmitting ha(0), ha(1), hb(0), and hb(1) multiple times. In this case, for example, a receiving device that only wants data from data symbol group #1 and a receiving device that only wants data from data symbol group # can know the status of the entire frame, thereby enabling both receiving devices to operate easily and stably.

[0419] Naturally, the receiving device (for example, Figure 23) that receives the modulated signal transmitted by the transmitting device in Figure 1 receives the control information described above, and based on that information, demodulates and decodes the data symbol group to obtain information.

[0420] As described above, by transmitting the information described in this embodiment as control information, it is possible to improve the quality of data reception and the efficiency of data transmission, thereby enabling the receiving device to operate accurately.

[0421] In Embodiments 1 and 2, Figures 3, 4, 5, and 6 were described as the frame configuration of the modulated signal transmitted by the transmitting device in Figure 1. However, the arrangement of data symbol group #1 and data symbol group #2 on the frequency axis in Figures 4, 5, and 6 is not limited to this arrangement. For example, they may be arranged as shown in Figures 27, 28, and 29, where data symbol group #1 (2701) and data symbol group #2 (2702). In Figures 27, 28, and 29, the vertical axis represents frequency and the horizontal axis represents time.

[0422] Furthermore, in the frame configuration of Figure 5, the transmission method for data symbol group #1 (401_1, 401_2) and the transmission method for data symbol group #2 (402) may be set in the first preamble 201 and / or the second preamble 202, and the transmission method for data symbol group #3 (403) may be set in the first preamble 501 and / or the second preamble 502.

[0423] At this time, the method for transmitting data symbol group #1 (401_1, 401_2), and The transmission method for data symbol group #2 (402) can be selected as either MIMO transmission or MISO transmission, or the transmission method for data symbol group #1 (401_1, 401_2) and data symbol group #2 (402) can be selected as either SISO transmission (SIMO transmission). Alternatively, the transmission method for data symbol group #3 (403) can be selected as either MIMO transmission or MISO transmission, or SISO transmission (SIMO transmission).

[0424] In other words, the method of transmitting multiple data symbol groups between "the first preamble and the second preamble set" and the next "the first preamble and the second preamble set" is either "MIMO transmission or MISO transmission" or "SISO transmission (SIMO transmission)," and in the method of transmitting multiple data symbol groups between "the first preamble and the second preamble set" and the next "the first preamble and the second preamble set," MIMO transmission and SISO transmission (SIMO transmission) are not mixed, and MISO transmission and SISO transmission (SIMO transmission) are not mixed.

[0425] When SISO (SIMO) and MIMO (MISO) transmission methods are mixed, the receiving device experiences large fluctuations in the received field strength, requiring AD (Analog-to-Digital) conversion. In this process, quantization errors are likely to occur, which can lead to a deterioration in the quality of received data. However, by using the method described above, it becomes more likely that the occurrence of such phenomena can be suppressed, resulting in an improvement in the quality of received data.

[0426] However, this is not limited to the above.

[0427] Furthermore, the switching of the transmission method as described above also involves switching the method of inserting pilot symbols into the data symbol group, which has advantages in terms of improving data transmission efficiency (because SISO (SIMO) transmission and MIMO (MISO) transmission methods are not mixed). (If SISO (SIMO) transmission and MIMO (MISO) transmission methods are mixed, the frequency of inserting pilot symbols may become excessive, potentially reducing data transmission efficiency.) The configuration of the pilot symbols to be inserted into the data symbol group is as follows.

[0428] The method of constructing pilot symbols differs between "pilot symbols inserted into the data symbol group when performing SISO transmission" and "pilot symbols inserted into the data symbol group when performing MIMO transmission or MISO transmission." This point will be explained using a diagram. Figure 41 shows an example of inserting a pilot symbol into the data symbol group when performing SISO transmission. In Figure 41, the horizontal axis represents time and the vertical axis represents frequency. In Figure 41, 4101 represents the symbol of data symbol group #1, and 4102 represents the pilot symbol. In this case, symbol 4101 of data symbol group #1 is transmitting data, and pilot symbol 4102 is a symbol used by the receiving device to estimate frequency offset, frequency synchronization, time synchronization, signal detection, and channel estimation (estimation of radio wave propagation environment). For example, it is assumed to be composed of PSK (Phase Shift Keying) symbols known to the transmitting and receiving devices (it is highly likely that PSK symbols are required).

[0429] Figure 42 shows an example of inserting a pilot symbol into the data symbol set when MIMO or MISO transmission is being performed. In Figure 42, the horizontal axis represents time and the vertical axis represents frequency. When MIMO or MISO transmission is being performed, modulated signals are transmitted from two antennas, respectively. These are named modulated signal #1 and modulated signal #2. Figure 42 is used to show examples of inserting pilot symbols for both modulated signal #1 and modulated signal #2.

[0430] Example 1) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulation signal #1 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulation signal #1 are PSK symbols.

[0431] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 are PSK symbols.

[0432] Furthermore, the "first pilot symbol 4201 for modulation signal #1 and the second pilot symbol 4202 for modulation signal #1" and the "first pilot symbol 4201 for modulation signal #2 and the second pilot symbol 4202 for modulation signal #2" are orthogonal (zero cross-correlation) at a certain period.

[0433] Example 2) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #1 as shown in Figure 42. The first pilot symbol 4201 for modulated signal #1 is the PSK symbol, and the second pilot symbol 4202 for modulated signal #1 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the second pilot symbol 4202 for modulated signal #1 does not need to be called a pilot symbol).

[0434] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. The second pilot symbol 4201 for modulated signal #2 is the PSK symbol, and the first pilot symbol 4202 for modulated signal #2 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the first pilot symbol 4202 for modulated signal #2 does not need to be called a pilot symbol).

[0435] Similarly, in the frame configuration of Figure 25, the transmission methods for data symbol group #1 (2501), data symbol group #2 (2502), and data symbol group #4 (2503) may be set in the first preamble 201 and / or the second preamble 202, and the transmission method for data symbol group #3 (403) may be set in the first preamble 501 and / or the second preamble 502.

[0436] At this time, the transmission method for data symbol group #1 (2501), data symbol group #2 (2502), and data symbol group #4 (2503) can be selected as either MIMO transmission or MISO transmission, or SISO transmission (SIMO transmission) for data symbol group #1 (2501), data symbol group #2 (2502), and data symbol group #4 (2503). The transmission method for data symbol group #3 (403) can be either MIMO transmission or MISO transmission, or SISO transmission (SIMO transmission) for data symbol group #3 (403). It may be possible to allow users to choose between the two options.

[0437] In other words, the method of transmitting multiple data symbol groups between "the first preamble and the second preamble set" and the next "the first preamble and the second preamble set" is either "MIMO transmission or MISO transmission" or "SISO transmission (SIMO transmission)," and in the method of transmitting multiple data symbol groups between "the first preamble and the second preamble set" and the next "the first preamble and the second preamble set," MIMO transmission and SISO transmission (SIMO transmission) are not mixed, and MISO transmission and SISO transmission (SIMO transmission) are not mixed.

[0438] When SISO (SIMO) and MIMO (MISO) transmission methods are mixed, the receiving device experiences large fluctuations in the received field strength, requiring AD (Analog-to-Digital) conversion. In this process, quantization errors are likely to occur, which can lead to a deterioration in the quality of received data. However, by using the method described above, it becomes more likely that the occurrence of such phenomena can be suppressed, resulting in an improvement in the quality of received data.

[0439] However, this is not limited to the above.

[0440] Furthermore, the switching of the transmission method as described above also involves switching the method of inserting pilot symbols into the data symbol group, which has advantages in terms of improving data transmission efficiency (because SISO (SIMO) transmission and MIMO (MISO) transmission methods are not mixed). (If SISO (SIMO) transmission and MIMO (MISO) transmission methods are mixed, the frequency of inserting pilot symbols may become excessive, potentially reducing data transmission efficiency.) The configuration of the pilot symbols to be inserted into the data symbol group is as follows.

[0441] The method of constructing pilot symbols differs between "pilot symbols inserted into the data symbol group when performing SISO transmission" and "pilot symbols inserted into the data symbol group when performing MIMO transmission or MISO transmission." This point will be explained using a diagram. Figure 41 shows an example of inserting a pilot symbol into the data symbol group when performing SISO transmission. In Figure 41, the horizontal axis represents time and the vertical axis represents frequency. In Figure 41, 4101 represents the symbol of data symbol group #1, and 4102 represents the pilot symbol. In this case, symbol 4101 of data symbol group #1 is transmitting data, and pilot symbol 4102 is a symbol used by the receiving device to estimate frequency offset, frequency synchronization, time synchronization, signal detection, and channel estimation (estimation of radio wave propagation environment). For example, it is assumed to be composed of PSK (Phase Shift Keying) symbols known to the transmitting and receiving devices (it is highly likely that PSK symbols are required).

[0442] Figure 42 shows an example of inserting a pilot symbol into the data symbol set when MIMO or MISO transmission is being performed. In Figure 42, the horizontal axis represents time and the vertical axis represents frequency. When MIMO or MISO transmission is being performed, modulated signals are transmitted from two antennas, respectively. These are named modulated signal #1 and modulated signal #2. Figure 42 is used to show examples of inserting pilot symbols for both modulated signal #1 and modulated signal #2.

[0443] Example 1) For modulated signal #1: Insert the first pilot symbol 4201 for modulated signal #1 and the second pilot symbol 4202 for modulated signal #1 as shown in Figure 42. Both the vol 4201 and the second pilot symbol 4202 for modulation signal #1 are PSK symbols.

[0444] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 are PSK symbols.

[0445] Furthermore, the "first pilot symbol 4201 for modulation signal #1 and the second pilot symbol 4202 for modulation signal #1" and the "first pilot symbol 4201 for modulation signal #2 and the second pilot symbol 4202 for modulation signal #2" are orthogonal (zero cross-correlation) at a certain period.

[0446] Example 2) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #1 as shown in Figure 42. The first pilot symbol 4201 for modulated signal #1 is the PSK symbol, and the second pilot symbol 4202 for modulated signal #1 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the second pilot symbol 4202 for modulated signal #1 does not need to be called a pilot symbol).

[0447] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. The second pilot symbol 4201 for modulated signal #2 is the PSK symbol, and the first pilot symbol 4202 for modulated signal #2 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the first pilot symbol 4202 for modulated signal #2 does not need to be called a pilot symbol).

[0448] Furthermore, in the frame configuration shown in Figure 6, the transmission methods for data symbol group #1 (401_1, 401_2), data symbol group #2 (402), and data symbol group #3 (403) may be set in the first preamble 201 and / or the second preamble 202.

[0449] In this case, it may be possible to select either "the transmission method for data symbol group #1 (401_1, 401_2) and the transmission method for data symbol group #2 (402) is MIMO transmission or MISO transmission" or "the transmission method for data symbol group #1 (401_1, 401_2) and the transmission method for data symbol group #2 (402) is SISO transmission (SIMO transmission)", and it may also be possible to select either "the transmission method for data symbol group #3 (403) is MIMO transmission or MISO transmission" or "the transmission method for data symbol group #3 (403) is SISO transmission (SIMO transmission)".

[0450] In other words, the transmission method for the multiple data symbol groups between the "first preamble and second preamble set" and the "pilot symbol" is either "MIMO transmission or MISO transmission" or "SISO transmission (SIMO transmission)" (MIMO transmission and SISO transmission (SIMO transmission) are never mixed, and MISO transmission and SISO transmission (SIMO transmission) are never mixed). Then, the "pilot symbol" and the next "first preamble and second preamble set" (however, in Figure 6, the pilot symbol The following "set of first and second preambles" is not shown. The method of transmitting multiple data symbol sets between them is either "MIMO transmission or MISO transmission" or "SISO transmission (SIMO transmission)" (MIMO transmission and SISO transmission (SIMO transmission) cannot be mixed, and MISO transmission and SISO transmission (SIMO transmission) cannot be mixed).

[0451] When SISO (SIMO) and MIMO (MISO) transmission methods are mixed, the receiving device experiences large fluctuations in the received field strength, requiring AD (Analog-to-Digital) conversion. In this process, quantization errors are likely to occur, which can lead to a deterioration in the quality of received data. However, by using the method described above, it becomes more likely that the occurrence of such phenomena can be suppressed, resulting in an improvement in the quality of received data.

[0452] However, this is not limited to the above.

[0453] Furthermore, the switching of the transmission method as described above also involves switching the method of inserting pilot symbols into the data symbol group, which has advantages in terms of improving data transmission efficiency (because SISO (SIMO) transmission and MIMO (MISO) transmission methods are not mixed). (If SISO (SIMO) transmission and MIMO (MISO) transmission methods are mixed, the frequency of inserting pilot symbols may become excessive, potentially reducing data transmission efficiency.) The configuration of the pilot symbols to be inserted into the data symbol group is as follows.

[0454] The method of constructing pilot symbols differs between "pilot symbols inserted into the data symbol group when performing SISO transmission" and "pilot symbols inserted into the data symbol group when performing MIMO transmission or MISO transmission." This point will be explained using a diagram. Figure 41 shows an example of inserting a pilot symbol into the data symbol group when performing SISO transmission. In Figure 41, the horizontal axis represents time and the vertical axis represents frequency. In Figure 41, 4101 represents the symbol of data symbol group #1, and 4102 represents the pilot symbol. In this case, symbol 4101 of data symbol group #1 is transmitting data, and pilot symbol 4102 is a symbol used by the receiving device to estimate frequency offset, frequency synchronization, time synchronization, signal detection, and channel estimation (estimation of radio wave propagation environment). For example, it is assumed to be composed of PSK (Phase Shift Keying) symbols known to the transmitting and receiving devices (it is highly likely that PSK symbols are required).

[0455] Figure 42 shows an example of inserting a pilot symbol into the data symbol set when MIMO or MISO transmission is being performed. In Figure 42, the horizontal axis represents time and the vertical axis represents frequency. When MIMO or MISO transmission is being performed, modulated signals are transmitted from two antennas, respectively. These are named modulated signal #1 and modulated signal #2. Figure 42 is used to show examples of inserting pilot symbols for both modulated signal #1 and modulated signal #2.

[0456] Example 1) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulation signal #1 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulation signal #1 are PSK symbols.

[0457] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 are PSK symbols.

[0458] Furthermore, the "first pilot symbol 4201 for modulation signal #1 and the second pilot symbol 4202 for modulation signal #1" and the "first pilot symbol 4201 for modulation signal #2 and the second pilot symbol 4202 for modulation signal #2" are orthogonal (zero cross-correlation) at a certain period.

[0459] Example 2) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #1 as shown in Figure 42. The first pilot symbol 4201 for modulated signal #1 is the PSK symbol, and the second pilot symbol 4202 for modulated signal #1 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the second pilot symbol 4202 for modulated signal #1 does not need to be called a pilot symbol).

[0460] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. The second pilot symbol 4201 for modulated signal #2 is the PSK symbol, and the first pilot symbol 4202 for modulated signal #2 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the first pilot symbol 4202 for modulated signal #2 does not need to be called a pilot symbol).

[0461] Similarly, in the frame configuration of Figure 26, the transmission methods for data symbol group #1 (2501), data symbol group #2 (2502), data symbol group #4 (2503), and data symbol group #3 (403) may be set in the first preamble 201 and / or the second preamble 202.

[0462] In this case, it may be possible to select either "the transmission method for data symbol group #1 (2501), the transmission method for data symbol group #2 (2502), and the transmission method for data symbol group #4 (2503) is MIMO transmission or MISO transmission," or "the transmission method for data symbol group #1 (2501), the transmission method for data symbol group #2 (2502), and the transmission method for data symbol group #4 (2503) is SISO transmission (SIMO transmission)," and it may also be possible to select either "the transmission method for data symbol group #3 (403) is MIMO transmission or MISO transmission," or "the transmission method for data symbol group #3 (403) is SISO transmission (SIMO transmission)."

[0463] In other words, the transmission method for the multiple data symbol groups between the "first preamble and second preamble set" and the "pilot symbol" is either "MIMO transmission or MISO transmission" or "SISO transmission (SIMO transmission)" (MIMO transmission and SISO transmission (SIMO transmission) are never mixed, and MISO transmission and SISO transmission (SIMO transmission) are never mixed). Furthermore, the transmission method for the multiple data symbol groups between the "pilot symbol" and the next "first preamble and second preamble set" (however, the "first preamble and second preamble set" following the pilot symbol is not shown in Figure 6) is either "MIMO transmission or MISO transmission" or "SISO transmission (SIMO transmission)" (MIMO transmission and SISO (There is no mixing of transmissions (SIMO transmission), and there is no mixing of MISO transmission and SISO transmission (SIMO transmission)).

[0464] When SISO (SIMO) and MIMO (MISO) transmission methods are mixed, the receiving device experiences large fluctuations in the received field strength, requiring AD (Analog-to-Digital) conversion. In this process, quantization errors are likely to occur, which can lead to a deterioration in the quality of received data. However, by using the method described above, it becomes more likely that the occurrence of such phenomena can be suppressed, resulting in an improvement in the quality of received data.

[0465] However, this is not limited to the above.

[0466] Furthermore, the switching of the transmission method as described above also involves switching the method of inserting pilot symbols into the data symbol group, which has advantages in terms of improving data transmission efficiency (because SISO (SIMO) transmission and MIMO (MISO) transmission methods are not mixed). (If SISO (SIMO) transmission and MIMO (MISO) transmission methods are mixed, the frequency of inserting pilot symbols may become excessive, potentially reducing data transmission efficiency.) The configuration of the pilot symbols to be inserted into the data symbol group is as follows.

[0467] The method of constructing pilot symbols differs between "pilot symbols inserted into the data symbol group when performing SISO transmission" and "pilot symbols inserted into the data symbol group when performing MIMO transmission or MISO transmission." This point will be explained using a diagram. Figure 41 shows an example of inserting a pilot symbol into the data symbol group when performing SISO transmission. In Figure 41, the horizontal axis represents time and the vertical axis represents frequency. In Figure 41, 4101 represents the symbol of data symbol group #1, and 4102 represents the pilot symbol. In this case, symbol 4101 of data symbol group #1 is transmitting data, and pilot symbol 4102 is a symbol used by the receiving device to estimate frequency offset, frequency synchronization, time synchronization, signal detection, and channel estimation (estimation of radio wave propagation environment). For example, it is assumed to be composed of PSK (Phase Shift Keying) symbols known to the transmitting and receiving devices (it is highly likely that PSK symbols are required).

[0468] Figure 42 shows an example of inserting a pilot symbol into the data symbol set when MIMO or MISO transmission is being performed. In Figure 42, the horizontal axis represents time and the vertical axis represents frequency. When MIMO or MISO transmission is being performed, modulated signals are transmitted from two antennas, respectively. These are named modulated signal #1 and modulated signal #2. Figure 42 is used to show examples of inserting pilot symbols for both modulated signal #1 and modulated signal #2.

[0469] Example 1) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulation signal #1 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulation signal #1 are PSK symbols.

[0470] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 are PSK It is a symbol.

[0471] Furthermore, the "first pilot symbol 4201 for modulation signal #1 and the second pilot symbol 4202 for modulation signal #1" and the "first pilot symbol 4201 for modulation signal #2 and the second pilot symbol 4202 for modulation signal #2" are orthogonal (zero cross-correlation) at a certain period.

[0472] Example 2) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #1 as shown in Figure 42. The first pilot symbol 4201 for modulated signal #1 is the PSK symbol, and the second pilot symbol 4202 for modulated signal #1 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the second pilot symbol 4202 for modulated signal #1 does not need to be called a pilot symbol).

[0473] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. The second pilot symbol 4201 for modulated signal #2 is the PSK symbol, and the first pilot symbol 4202 for modulated signal #2 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the first pilot symbol 4202 for modulated signal #2 does not need to be called a pilot symbol).

[0474] (Embodiment 3) In Embodiments 1 and 2, multiple streams are transmitted using multiple antennas, and a MIMO transmission method using precoding and phase shifting (or a MIMO transmission method without phase shifting) and a MIMO transmission method using space-time block codes (or space-frequency block codes) are used. Having described the (Multiple-Input Single-Output) transmission method, we will now explain an example of how to transmit a preamble when considering that the transmitting device transmits a modulated signal using these transmission methods.

[0475] The transmitting device in Figure 1 is equipped with antenna 126_1 and antenna 126_2. In this case, the antenna configuration method that is likely to facilitate the separation of the two modulated signals to be transmitted is as follows: "Antenna 126_1 is for horizontal polarization, and antenna 126_2 is for vertical polarization." or "Antenna 126_1 is for vertical polarization, and antenna 126_2 is for horizontal polarization." or "Antenna 126_1 is an antenna for right-hand circular polarization, and antenna 126_2 is an antenna for left-hand circular polarization." or "Antenna 126_1 is an antenna for left-hand circular polarization, and antenna 126_2 is an antenna for right-hand circular polarization." This antenna configuration method is referred to as the first antenna configuration method.

[0476] Furthermore, any antenna configuration method other than the first antenna configuration method will be referred to as the second antenna configuration method. Therefore, the second antenna configuration method includes, for example, "Antenna 126_1 is a horizontal polarization antenna, and antenna 126_2 is a horizontal polarization antenna." and "Antenna 126_1 is a vertical polarization antenna, and antenna 126_2 is a vertical polarization antenna." "Antenna 126_1 is an antenna for left-hand circular polarization, and antenna 126_2 is an antenna for left-hand circular polarization." and "Antenna 126_1 is an antenna for right-hand circular polarization, and antenna 126_2 is an antenna for right-hand circular polarization." This will include it.

[0477] Each transmitting device (Figure 1) has a first antenna configuration method (for example, "antenna 126_1 is an antenna for horizontal polarization, and antenna 126_2 is an antenna for vertical polarization" or "antenna 126_1 is an antenna for vertical polarization, and antenna 126_2 is an antenna for horizontal polarization"), or A second antenna configuration method (for example, "Antenna 126_1 is a horizontal polarization antenna, and Antenna 126_2 is a horizontal polarization antenna" or "Antenna 126_1 is a vertical polarization antenna, and Antenna 126_2 is a vertical polarization antenna") It is possible to configure this, and for example, in a broadcasting system, depending on the location (installation area) of the transmitting device, either the first antenna configuration method or the second antenna configuration method may be adopted.

[0478] In such antenna configuration methods, for example, when using the frame configuration methods shown in Figures 2 to 6 and Figures 24 to 26, the configuration methods for the first and second preambles will be explained.

[0479] Similar to Embodiment 2, the transmitting device transmits control information regarding the antenna configuration method using the first preamble. In this case, the information regarding the antenna configuration method is denoted as m(0) and m(1).

[0480] In this case, if the transmitting device has two transmitting antennas, and the first transmitting antenna is a horizontally polarized antenna (i.e., transmits a first horizontally polarized modulated signal) and the second transmitting antenna is a horizontally polarized antenna (i.e., transmits a second horizontally polarized modulated signal), then m(0)=0 and m(1)=0 are set, and the transmitting device transmits m(0) and m(1).

[0481] In a transmitting device equipped with two transmitting antennas, if the first transmitting antenna is a vertically polarized antenna (i.e., transmits a first vertically polarized modulated signal) and the second transmitting antenna is a vertically polarized antenna (i.e., transmits a second vertically polarized modulated signal), then m(0)=1 and m(1)=0 are set, and the transmitting device transmits m(0) and m(1).

[0482] In a transmitting device equipped with two transmitting antennas, if the first transmitting antenna is a horizontally polarized antenna (i.e., transmits a first modulated signal with horizontal polarization) and the second transmitting antenna is a vertically polarized antenna (i.e., transmits a second modulated signal with vertical polarization), then m(0)=0 and m(1)=1 are set, and the transmitting device transmits m(0) and m(1).

[0483] In the two transmitting antennas of the transmitting device, the first transmitting antenna is a vertical polarization antenna (i.e., it transmits a first vertically polarized modulation signal), and the second transmitting antenna is horizontally polarized. In the case of a polarization antenna (i.e., one that transmits a second modulation signal with horizontal polarization), m(0)=1 and m(1)=1 are set, and the transmitting device transmits m(0) and m(1).

[0484] Furthermore, the transmitting device transmits m(0) and m(1) in the frame configuration methods shown in Figures 2 to 6 and Figures 24 to 26, for example, in the first preamble. This allows the receiving device to easily determine what polarization was used to transmit the modulated signal (for example, the second preamble or data symbol group) transmitted by the transmitting device by receiving and demodulating / decoding the first preamble. This enables the receiving device to accurately set the antenna (including the use of polarization) to be used during reception, thereby achieving a high reception gain (high received field strength) (there is also the advantage of not having to perform signal processing for reception where the effect of gaining is small). This results in the advantage of improved data reception quality.

[0485] I previously stated that "this also has the advantage of eliminating the need for signal processing for reception where gaining gain is not very effective," but I will provide further explanation on this point.

[0486] Consider the case where the transmitting device transmits a modulated signal only in horizontal polarization, and the receiving device is equipped with both a horizontal polarization receiving antenna and a vertical polarization receiving antenna. In this case, the modulated signal transmitted by the transmitting device can be received by the receiving device's horizontal polarization receiving antenna, but the received electric field strength of the modulated signal transmitted by the transmitting device is very small for the receiving device's vertical polarization receiving antenna.

[0487] Therefore, in such cases, the need to process the received signal with the receiving antenna for vertical polarization of the receiving device to obtain data is minimal, considering the power consumed by the signal processing.

[0488] Based on the above, it is necessary for the transmitting device to transmit "control information regarding the antenna configuration method" and for the receiving device to control it accurately.

[0489] Next, we will explain the cases where the transmitting device is equipped with two or more horizontally polarized antennas (however, this does not necessarily mean that the transmitting device is not equipped with vertically polarized antennas), or where the transmitting device is equipped with two or more vertically polarized antennas (however, this does not necessarily mean that the transmitting device is not equipped with horizontally polarized antennas).

[0490] <When the transmitting device is equipped with two or more horizontal polarization antennas> In this case, when transmitting a single stream (SISO transmission method or SIMO transmission method), the transmitting device will transmit the modulated signal using one or more horizontally polarized antennas. Considering this case, if the transmitting device transmits the first preamble containing the control information regarding the antenna configuration method, as described above, using one or more horizontally polarized antennas, the receiving device can receive the first preamble containing the control information regarding the antenna configuration method with high gain, thereby achieving high data reception quality.

[0491] Furthermore, by obtaining control information regarding the antenna configuration, the receiving device can determine what antenna configuration the transmitting device used to transmit using the MIMO or MISO transmission method.

[0492] <When the transmitting device is equipped with two or more vertical polarization antennas> In this case, when transmitting a single stream (SISO transmission method or SIMO transmission method), the transmitting device will transmit the modulated signal using one or more vertically polarized antennas. Considering this case, the control information regarding the antenna configuration method described above... When a transmitting device transmits a first preamble containing control information regarding the antenna configuration using one or more vertical polarization antennas, the receiving device can receive the first preamble containing control information regarding the antenna configuration with high gain, thereby achieving high data reception quality.

[0493] Furthermore, by obtaining control information regarding the antenna configuration, the receiving device can determine what antenna configuration the transmitting device used to transmit using the MIMO or MISO transmission method.

[0494] Next, we will describe the case where the transmitting device is equipped with both a horizontally polarized antenna and a vertically polarized antenna.

[0495] In this case, when transmitting a single stream (SISO transmission method or SIMO transmission method), the transmitting device, Method 1: A modulated signal is transmitted using both a horizontally polarized antenna and a vertically polarized antenna. Method 2: A horizontal polarization antenna is used to transmit the modulated signal. Third method: A vertically polarized antenna transmits the modulated signal. That is a possibility.

[0496] In this case, the antenna used to transmit the first preamble containing control information regarding the antenna configuration method, as described above, will transmit in the same manner as the antenna used when transmitting a single stream (SISO transmission method or SIMO transmission method).

[0497] Therefore, when transmitting a single stream (SISO transmission method or SIMO transmission method), if the modulated signal is transmitted using the first method, the first preamble containing control information regarding the antenna configuration will be transmitted from the horizontally polarized antenna and the vertically polarized antenna.

[0498] When transmitting the modulated signal using the second method, the first preamble, which includes control information regarding the antenna configuration, will be transmitted from the antenna for horizontal polarization.

[0499] When transmitting the modulated signal using the third method, the first preamble, which includes control information regarding the antenna configuration, will be transmitted from the antenna for vertical polarization.

[0500] This approach has the advantage that the receiving device can receive the first preamble in the same way as the data symbol set transmitted using the SISO method (eliminating the need to change the signal processing method depending on the transmission method). (The advantages described above can also be obtained.)

[0501] Furthermore, by obtaining control information regarding the antenna configuration, the receiving device can determine what antenna configuration the transmitting device used to transmit using the MIMO or MISO transmission method.

[0502] As described above, by transmitting a first preamble containing control information regarding the antenna configuration method, the receiving device can receive with high gain. This results in improved reception quality of the data symbol group and improved power efficiency of the receiving device.

[0503] Although the above explanation uses the case where the first preamble includes control information regarding the antenna configuration method as an example, the same effect can be obtained even when the first preamble does not include control information regarding the antenna configuration method.

[0504] Furthermore, the antenna used to transmit the first preamble is likely to be determined during the installation or maintenance of the transmitting equipment, and while it is possible to change the antenna used during operation, this is unlikely to occur frequently in actual operation.

[0505] (Embodiment 4) In the above-described embodiment, an example of the frame configuration in the modulated signal transmitted by the transmitting device shown in Figure 1 was explained. In this embodiment, the frame configuration in the modulated signal transmitted by the transmitting device shown in Figure 1 will be explained further.

[0506] Figure 30 shows an example of the frame configuration in the modulated signal transmitted by the transmitter in Figure 1. Components that operate similarly to those in Figure 2 are given the same number and their explanations are omitted. In Figure 30, the vertical axis represents frequency and the horizontal axis represents time. Furthermore, since a multi-carrier transmission method such as OFDM is used, multiple carriers are assumed to exist on the vertical axis frequency.

[0507] In Figure 30, 3001 represents data symbol group #1, 3002 represents data symbol group #2, and 3003 represents data symbol group #3. Between time t1 and time t2, data symbol group #1 (3001), data symbol group #2 (3002), and data symbol group #3 (3003) exist, indicating that multiple data symbol groups exist at each time point.

[0508] Similarly, 3004 represents data symbol group #4, 3005 represents data symbol group #5, and 3006 represents data symbol group #6. Between time t2 and time t3, data symbol group #4 (3004), data symbol group #5 (3005), and data symbol group #6 (3006) exist, indicating that multiple data symbol groups exist at each time point.

[0509] Furthermore, 3007 represents data symbol group #7, 3008 represents data symbol group #8, and 3009 represents data symbol group #9. Between time t3 and time t4, data symbol group #7 (3007), data symbol group #8 (3008), and data symbol group #9 (3009) are present, and multiple data symbol groups exist at each time point.

[0510] In this case, the number of carriers to be used can be set for each data symbol group, and the number of symbol groups present at each time point is not limited to three; it is sufficient for two or more symbol groups to exist.

[0511] Furthermore, the data symbol set may also be a symbol set based on the MIMO (transmission) method and the MISO (transmission) method (of course, the data symbol set may also be a symbol set of the SISO (SIMO) method). In this case, multiple streams (s1, s2, which will be explained later) will be transmitted at the same time and on the same (common) frequency. (In this case, multiple modulated signals will be transmitted from multiple (different) antennas at the same time and on the same (common) frequency.) And this point is not limited to Figure 30, but is the same in Figures 31, 32, 33, 34, 35, 36, 37, and 38.

[0512] A distinctive feature of Figure 30 is that frequency division is performed, resulting in two or more time intervals where multiple data symbol groups exist. This allows symbol groups with different data reception quality to coexist at the same time, and by appropriately defining the data intervals... This has the effect of allowing for flexible setting of data transmission speed.

[0513] Figure 31 shows an example of the frame configuration in the modulated signal transmitted by the transmitter in Figure 1. Components that operate similarly to those in Figures 2 and 30 are given the same numbering, and their explanations are omitted. In Figure 31, the vertical axis represents frequency, and the horizontal axis represents time. Furthermore, since a multi-carrier transmission method such as OFDM is used, multiple carriers are assumed to exist on the vertical axis (frequency).

[0514] 3101 represents data symbol group #10, and 3102 represents data symbol group #11. Between time t4 and time t5, data symbol group #10 (3101) and data symbol group #11 (3102) exist. At this time, a time division is performed and multiple data symbol groups exist.

[0515] A distinctive feature of Figure 31 is that frequency division is performed, resulting in two or more time intervals where multiple data symbol groups exist, and that time division is performed, resulting in the existence of multiple data symbols. This allows symbol groups with different data reception quality to exist simultaneously, and by appropriately defining the data intervals, the data transmission speed can be flexibly set.

[0516] Figure 32 shows an example of the frame configuration in the modulated signal transmitted by the transmitter in Figure 1. Components that operate similarly to those in Figures 2, 30, and 5 are given the same numbering, and their explanations are omitted. In Figure 32, the vertical axis represents frequency, and the horizontal axis represents time. Furthermore, since a multi-carrier transmission method such as OFDM is used, multiple carriers are assumed to exist on the vertical axis (frequency).

[0517] 3201 represents data symbol group #7, and 3202 represents data symbol group #8. Between time t4 and time t5, data symbol group #7 (3201) and data symbol group #8 (3202) exist. At this time, a time division is performed and multiple data symbol groups exist.

[0518] The difference from Figure 31 is that the first preamble 501 and the second preamble 502 are placed before data symbol group #7 (3201). In this case, control information related to the frequency-divided data symbol groups #1 to #6 (for example, the number of carriers and time interval required for each data symbol group, the modulation scheme for each data symbol group, the transmission method for each data symbol group, the error correction code scheme used for each data symbol group, etc.) will be transmitted by the first preamble (201) and / or the second preamble (202) in Figure 32. An example of control information is described in Embodiment 2. (This point will be explained separately.)

[0519] The control information for the time-divided data symbol groups #7 and #8 (for example, the number of symbols required (or time interval) for each data symbol group, the modulation scheme for each data symbol group, the transmission method for each data symbol group, the error correction code scheme used for each data symbol group, etc.) is transmitted in the first preamble (501) and / or the second preamble (502) in Figure 32. An example of the control information is described in Embodiment 2. (This point will be explained separately.)

[0520] When control information is transmitted in this manner, it becomes unnecessary to include dedicated control information for time-division data symbol groups in the first preamble 201 and the second preamble 202, and also unnecessary to include frequency-division data symbol groups in the first preamble 501 and the second preamble 502. This eliminates the need to include dedicated control information, improving the data transmission efficiency of control information and simplifying control for the receiving device.

[0521] A distinctive feature of Figure 32 is that frequency division is performed, resulting in two or more time intervals where multiple data symbol groups exist, and that time division is performed, resulting in the existence of multiple data symbols. This allows symbol groups with different data reception quality to exist simultaneously, and by appropriately defining the data intervals, the data transmission speed can be flexibly set.

[0522] Figure 33 shows an example of the frame configuration in the modulated signal transmitted by the transmitter shown in Figure 1. Components that operate similarly to those in Figures 2, 30, 32, and 6 are given the same number and their explanations are omitted. In Figure 33, the vertical axis represents frequency and the horizontal axis represents time. Furthermore, since a multi-carrier transmission method such as OFDM is used, multiple carriers are assumed to exist on the vertical axis (frequency).

[0523] 3201 represents data symbol group #7, and 3202 represents data symbol group #8. Between time t4 and time t5, data symbol group #7 (3201) and data symbol group #8 (3202) exist. At this time, a time division is performed and multiple data symbol groups exist.

[0524] The difference between Figures 30 and 31 is that pilot symbol 601 is placed before data symbol group #7 (3201). The advantages of placing pilot symbol 601 in this case are as explained in Embodiment 1.

[0525] A distinctive feature of Figure 33 is that frequency division is performed, resulting in two or more time intervals where multiple data symbol groups exist, and that time division is performed, resulting in the existence of multiple data symbols. This allows symbol groups with different data reception quality to exist simultaneously, and by appropriately defining the data intervals, the data transmission speed can be flexibly set.

[0526] Figure 34 shows an example of the frame configuration in the modulated signal transmitted by the transmitter in Figure 1. Components that operate similarly to those in Figure 2 are given the same number and their explanations are omitted. In Figure 34, the vertical axis represents frequency and the horizontal axis represents time. Furthermore, since a transmission method using a multi-carrier method such as OFDM is used, multiple carriers are assumed to exist on the vertical axis frequency.

[0527] In Figure 34, 3401 represents data symbol group #1, 3402 represents data symbol group #2, 3403 represents data symbol group #3, 3404 represents data symbol group #4, 3405 represents data symbol group #5, 3406 represents data symbol group #6, 3407 represents data symbol group #7, and 3408 represents data symbol group #8.

[0528] In Figure 34, the data symbols are arranged in the frame using a frequency division scheme. The difference between Figure 34 and Figures 30 through 33 is the flexibility in setting the time intervals for each data symbol group.

[0529] For example, data symbol group #1 has symbols placed from time t1 to time t2, and the time interval is longer compared to other data symbols. The time intervals for other data symbol groups are also set flexibly.

[0530] A distinctive feature of Figure 34 is that frequency division is performed, allowing for flexible setting of the time intervals between data symbol groups. This enables the simultaneous existence of symbol groups with different data reception quality, and by appropriately defining the data interval, it allows for flexible setting of the data transmission speed.

[0531] Figure 35 shows an example of the frame configuration in the modulated signal transmitted by the transmitter shown in Figure 1. Components that operate similarly to those in Figures 2 and 34 are given the same numbering, and their explanations are omitted. In Figure 35, the vertical axis represents frequency, and the horizontal axis represents time. Furthermore, since a multi-carrier transmission method such as OFDM is used, multiple carriers are assumed to exist on the vertical axis (frequency).

[0532] In Figure 35, 3509 represents data symbol group #9, 3510 represents data symbol group #10, 3511 represents data symbol group #11, and 3512 represents data symbol group #12. Frequency division is performed, and data symbol groups #9, #10, #11, #12, and #13 are transmitted between time t2 and t3. A notable feature when comparing time t1 and time t2 is that the time intervals for data symbol group #9, data symbol group #10, and data symbol group #11 are equal, and the time intervals for data symbol group #12 and data symbol group #13 are equal.

[0533] In Figure 35, 3514 represents data symbol group #14 and 3515 represents data symbol group #15. Time division is performed, and data symbol group #14 and data symbol group #15 are transmitted between time t3 and time t4.

[0534] This allows symbol groups with different data reception quality to coexist simultaneously, and by appropriately defining the data interval and frequency interval, the data transmission speed can be flexibly set.

[0535] Figure 36 shows an example of the frame configuration in the modulated signal transmitted by the transmitter in Figure 1. Components that operate similarly to those in Figures 2, 6, 34, and 35 are given the same numbering, and their explanations are omitted. In Figure 36, the vertical axis represents frequency, and the horizontal axis represents time. Furthermore, since a multi-carrier transmission method such as OFDM is used, multiple carriers are assumed to exist on the vertical axis (frequency).

[0536] The difference between Figure 36 and Figure 35 is that Figure 36 shows the arrangement of the first preamble 501, the second preamble 502, and the first preamble 3601 and the second preamble 3602. In this arrangement, data symbol groups #1 to #8 and data symbol groups #9 to #13 are frequency-division multiplexed, while data symbol groups #14 and #15 are time-division multiplexed and arranged.

[0537] This allows symbol groups with different data reception quality to coexist simultaneously, and by appropriately defining the data interval and frequency interval, the data transmission speed can be flexibly set.

[0538] At this time, control information related to the frequency-divided data symbol groups #1 to #8 (for example, the number of carriers and time interval required for each data symbol group, the modulation scheme for each data symbol group, the transmission method for each data symbol group, the error correction code scheme used for each data symbol group, etc.) will be transmitted in the first preamble (201) and / or the second preamble (202) in Figure 36. Note that the control information is as follows: An example is explained in section 2. (This point will be explained separately.)

[0539] The control information associated with the frequency-divided data symbol groups #9 to #13 (for example, the number of carriers and time interval required for each data symbol group, the modulation scheme for each data symbol group, the transmission method for each data symbol group, the error correction code scheme used for each data symbol group, etc.) is transmitted in the first preamble (501) and / or the second preamble (502) in Figure 36. An example of the control information is described in Embodiment 2. (This point will be explained separately.)

[0540] Furthermore, control information related to the time-divided data symbol groups #14 and #15 (for example, the number of symbols required (or time interval) for each data symbol group, the modulation scheme for each data symbol group, the transmission method for each data symbol group, the error correction code scheme used for each data symbol group, etc.) will be transmitted in the first preamble (3601) and / or the second preamble (3602) in Figure 36. An example of control information is described in Embodiment 2. (This point will be explained separately.)

[0541] By transmitting control information in this manner, it becomes unnecessary to include dedicated control information for time-division data symbol groups in the first preamble 201, second preamble 202, first preamble 501, and second preamble 502. Furthermore, it becomes unnecessary to include dedicated control information for frequency-division data symbol groups in the first preamble 3601 and second preamble 3602. This improves the data transmission efficiency of control information and simplifies control for the receiving device's control information.

[0542] Figure 37 shows an example of the frame configuration in the modulated signal transmitted by the transmitter shown in Figure 1. Components that operate similarly to those in Figures 2, 6, 34, and 35 are given the same numbering, and their explanations are omitted. In Figure 37, the vertical axis represents frequency, and the horizontal axis represents time. Furthermore, since a transmission method using a multi-carrier scheme such as OFDM is assumed, multiple carriers are assumed to exist on the vertical axis (frequency).

[0543] The difference between Figure 37 and Figures 35 and 36 is that pilot symbols 601 and 3701 are included. In this case, data symbol groups #1 to #8 and data symbol groups #9 to #13 are frequency-division multiplexed, while data symbol groups #14 and #15 are time-division multiplexed and arranged.

[0544] This allows groups of symbols with different data reception quality to coexist at the same time, and by appropriately defining the data interval and frequency interval, the data transmission speed can be flexibly set. The effects of inserting pilot symbols are as described in Embodiment 1.

[0545] Figure 38 shows an example of the frame configuration in the modulated signal transmitted by the transmitter in Figure 1. Components that operate similarly to those in Figures 2, 6, 34, and 35 are given the same numbering, and their explanations are omitted. In Figure 38, the vertical axis represents frequency, and the horizontal axis represents time. Furthermore, since a multi-carrier transmission method such as OFDM is used, multiple carriers are assumed to exist on the vertical axis (frequency).

[0546] The difference between Figure 38 and Figures 35, 36, and 37 is that it includes the "first preamble and second preamble," or "pilot symbols" 3801 and 3802. In this case, data symbol groups #1 to #8 and data symbol groups #9 to #13 are frequency-division multiplexed, while data symbol groups #14 and #15 are time-division multiplexed and arranged.

[0547] This allows symbol groups with different data reception quality to coexist simultaneously, and by appropriately defining the data interval and frequency interval, the data transmission speed can be flexibly set.

[0548] Then, as shown in Figure 38, the "first preamble and second preamble" or "pilot symbols" 3801 and 3802 are inserted, and depending on the situation, the "first preamble and second preamble" or "pilot symbols" are switched between for use. For example, the above switching may be performed based on the transmission method.

[0549] Figures 30 to 38 show examples where time-division data symbols are placed after frequency-division data symbols, but this is not the only option; frequency-division data symbols may also be placed after time-division data symbols. In this case, as shown in Figures 32 and 36, a first preamble and a second preamble are inserted between the time-division data symbols and the frequency-division data symbols. (However, other symbols may also be inserted.) Then, as shown in Figures 33 and 37, a pilot symbol is inserted between the time-division data symbols and the frequency-division data symbols. (However, other symbols may also be inserted.)

[0550] In this embodiment, examples of the frame configuration of the modulated signal transmitted by the transmitting device are shown in Figures 30 to 38. While these figures are described as "time-division multiplexing," when connecting two data symbol groups, there may be frequency-division multiplexing at the connection point. This point will be explained using Figure 39.

[0551] In Figure 39, 3901 represents the symbol of data symbol group #1, and 3902 represents the symbol of data symbol group #2. Assume that the symbols of data symbol group #1 end on carrier 4, as shown at time t0 in Figure 39. At this time, assume that the symbols of data symbol group #2 are placed starting from carrier 5 at time t0. Then, only the portion at time t0 is exceptionally frequency-division. However, before time t0, only the symbols of data symbol group #1 exist, and after time t0, only the symbols of data symbol group #2 exist. In this respect, it is time-division (time-based division).

[0552] As another example, see Figure 40. Note that the same numbering as in Figure 39 is used. Assume that, as in time t0 in Figure 40, the symbols of data symbol group #1 end on carrier 4. Then, assume that, as in time t1, the symbols of data symbol group #1 end on carrier 5. Then, assume that the symbols of data symbol group #2 are placed from carrier 5 at time t0, and from carrier 6 at time t1. In this case, the parts at times t0 and t1 are exceptionally frequency-division. However, before time t0, only symbols of data symbol group #1 exist, and after time t1, only symbols of data symbol group #2 exist. In this respect, it is time-division (time-based division).

[0553] As shown in Figures 39 and 40, excluding exceptional cases, if there are times when no data symbols other than those in data symbol group #1 exist (pilot symbols may exist, etc.) and times when no data symbols other than those in data symbol group #2 exist (pilot symbols may exist, etc.) exist, we will refer to this as "time division (time partitioning) being performed." (Therefore, the existence of exceptional times is not limited to Figures 39 and 40).

[0554] Furthermore, regarding "performing time division (time partitioning)," this is not limited to this embodiment. No, the same interpretation shall apply to other embodiments as well.

[0555] As described in Embodiment 1, the transmitting device in Figure 1 may select any of the frame configurations described in Embodiments 1 to 3 or the frame configuration described in this embodiment and transmit a modulated signal. (An example of how to configure the control information related to the frame configuration is as described in Embodiment 1.)

[0556] The receiving device (for example, Figure 23) that receives the modulated signal transmitted by the transmitting device in Figure 1 receives the control information described in Embodiment 1, Embodiment 2, etc., and demodulates and decodes the data symbol group based on that information to obtain the information. Therefore, by transmitting the information described herein as control information, it is possible to improve the quality of data reception and the efficiency of data transmission, and to obtain the effect of being able to operate the receiving device accurately.

[0557] In the frame configuration of Figure 32, the transmission method for data symbol groups #1 to #6 may be set in the first preamble 201 and / or the second preamble 202, and the transmission method for data symbol groups #7 and #8 may be set in the first preamble 501 and / or the second preamble 502.

[0558] In this case, the transmission method for data symbol groups #1 to #6 can be selected as either MIMO transmission or MISO transmission, or SISO transmission (SIMO transmission). The transmission method for data symbol groups #7 and #8 can also be selected as either MIMO transmission or MISO transmission, or SISO transmission (SIMO transmission).

[0559] In other words, the method of transmitting multiple data symbol groups between "the first preamble and the second preamble set" and the next "the first preamble and the second preamble set" is either "MIMO transmission or MISO transmission" or "SISO transmission (SIMO transmission)," and in the method of transmitting multiple data symbol groups between "the first preamble and the second preamble set" and the next "the first preamble and the second preamble set," MIMO transmission and SISO transmission (SIMO transmission) are not mixed, and MISO transmission and SISO transmission (SIMO transmission) are not mixed.

[0560] When SISO (SIMO) and MIMO (MISO) transmission methods are mixed, the receiving device experiences large fluctuations in the received field strength, requiring AD (Analog-to-Digital) conversion. In this process, quantization errors are likely to occur, which can lead to a deterioration in the quality of received data. However, by using the method described above, it becomes more likely that the occurrence of such phenomena can be suppressed, resulting in an improvement in the quality of received data.

[0561] However, this is not limited to the above.

[0562] Furthermore, the switching of the transmission method as described above also involves switching the method of inserting pilot symbols into the data symbol group, which has advantages in terms of improving data transmission efficiency (because SISO (SIMO) transmission and MIMO (MISO) transmission methods are not mixed). (If SISO (SIMO) transmission and MIMO (MISO) transmission methods are mixed, the frequency of inserting pilot symbols may become excessive, potentially reducing data transmission efficiency.) The configuration of the pilot symbols to be inserted into the data symbol group is as follows.

[0563] "A pilot symbol to be inserted into the data symbol set when performing SISO transmission." The method of constructing pilot symbols differs between "pilot symbols inserted into the data symbol group when MIMO transmission or MISO transmission is being performed" and "pilot symbols inserted into the data symbol group when SISO transmission is being performed." This point will be explained using a diagram. Figure 41 shows an example of inserting "pilot symbols inserted into the data symbol group when SISO transmission is being performed." In Figure 41, the horizontal axis is time and the vertical axis is frequency. In Figure 41, 4101 shows the symbol of data symbol group #1, and 4102 shows the pilot symbol. In this case, symbol 4101 of data symbol group #1 is transmitting data, and pilot symbol 4102 is a symbol used by the receiving device to estimate frequency offset, frequency synchronization, time synchronization, signal detection, and channel estimation (estimation of radio wave propagation environment). For example, it is assumed to be composed of PSK (Phase Shift Keying) symbols known to the transmitting and receiving devices (it is highly likely that PSK symbols are required).

[0564] Figure 42 shows an example of inserting a pilot symbol into the data symbol set when MIMO or MISO transmission is being performed. In Figure 42, the horizontal axis represents time and the vertical axis represents frequency. When MIMO or MISO transmission is being performed, modulated signals are transmitted from two antennas, respectively. These are named modulated signal #1 and modulated signal #2. Figure 42 is used to show examples of inserting pilot symbols for both modulated signal #1 and modulated signal #2.

[0565] Example 1) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulation signal #1 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulation signal #1 are PSK symbols.

[0566] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 are PSK symbols.

[0567] Furthermore, the "first pilot symbol 4201 for modulation signal #1 and the second pilot symbol 4202 for modulation signal #1" and the "first pilot symbol 4201 for modulation signal #2 and the second pilot symbol 4202 for modulation signal #2" are orthogonal (zero cross-correlation) at a certain period.

[0568] Example 2) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #1 as shown in Figure 42. The first pilot symbol 4201 for modulated signal #1 is the PSK symbol, and the second pilot symbol 4202 for modulated signal #1 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the second pilot symbol 4202 for modulated signal #1 does not need to be called a pilot symbol).

[0569] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. The second pilot symbol 4201 for modulated signal #2 is the PSK symbol, and the first pilot symbol 42 02 is assumed to be a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the first pilot symbol 4202 for modulated signal #2 does not need to be called a pilot symbol).

[0570] Similarly, in the frame configuration of Figure 36, the transmission method for data symbol groups #1 to #8 may be set in the first preamble 201 and / or the second preamble 202, the transmission method for data symbol groups #9 to #13 may be set in the first preamble 501 and / or the second preamble 502, and the transmission method for data symbol groups #14 and #15 may be set in the first preamble 3601 and / or the second preamble 3602.

[0571] In this case, the transmission method for data symbol groups #1 to #8 can be selected as either MIMO transmission or MISO transmission, or SISO transmission (SIMO transmission). The transmission method for data symbol groups #9 to #13 can be selected as either MIMO transmission or MISO transmission, or SISO transmission (SIMO transmission). The transmission method for data symbol groups #14 and #15 can be selected as either MIMO transmission or MISO transmission, or SISO transmission (SIMO transmission).

[0572] In other words, the method of transmitting multiple data symbol groups between "the first preamble and the second preamble set" and the next "the first preamble and the second preamble set" is either "MIMO transmission or MISO transmission" or "SISO transmission (SIMO transmission)," and in the method of transmitting multiple data symbol groups between "the first preamble and the second preamble set" and the next "the first preamble and the second preamble set," MIMO transmission and SISO transmission (SIMO transmission) are not mixed, and MISO transmission and SISO transmission (SIMO transmission) are not mixed.

[0573] When SISO (SIMO) and MIMO (MISO) transmission methods are mixed, the receiving device experiences large fluctuations in the received field strength, requiring AD (Analog-to-Digital) conversion. In this process, quantization errors are likely to occur, which can lead to a deterioration in the quality of received data. However, by using the method described above, it becomes more likely that the occurrence of such phenomena can be suppressed, resulting in an improvement in the quality of received data.

[0574] However, this is not limited to the above.

[0575] Furthermore, the switching of the transmission method as described above also involves switching the method of inserting pilot symbols into the data symbol group, which has advantages in terms of improving data transmission efficiency (because SISO (SIMO) transmission and MIMO (MISO) transmission methods are not mixed). (If SISO (SIMO) transmission and MIMO (MISO) transmission methods are mixed, the frequency of inserting pilot symbols may become excessive, potentially reducing data transmission efficiency.) The configuration of the pilot symbols to be inserted into the data symbol group is as follows.

[0576] The method of constructing pilot symbols differs between "pilot symbols inserted into the data symbol group when performing SISO transmission" and "pilot symbols inserted into the data symbol group when performing MIMO transmission or MISO transmission." This point will be explained using a diagram. Figure 41 shows an example of inserting a "pilot symbol inserted into the data symbol group when performing SISO transmission." In Figure 41, the horizontal axis represents time and the vertical axis represents frequency. In Figure 41, 4101 is the synth of data symbol group #1. The symbol 4101 in data symbol group #1 transmits data, and the pilot symbol 4102 is a symbol used by the receiving device to estimate frequency offset, frequency synchronization, time synchronization, signal detection, and channel estimation (estimation of the radio wave propagation environment). For example, it is assumed to consist of PSK (Phase Shift Keying) symbols known to the transmitting and receiving devices (it is highly likely that it must be a PSK symbol).

[0577] Figure 42 shows an example of inserting a pilot symbol into the data symbol set when MIMO or MISO transmission is being performed. In Figure 42, the horizontal axis represents time and the vertical axis represents frequency. When MIMO or MISO transmission is being performed, modulated signals are transmitted from two antennas, respectively. These are named modulated signal #1 and modulated signal #2. Figure 42 is used to show examples of inserting pilot symbols for both modulated signal #1 and modulated signal #2.

[0578] Example 1) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulation signal #1 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulation signal #1 are PSK symbols.

[0579] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 are PSK symbols.

[0580] Furthermore, the "first pilot symbol 4201 for modulation signal #1 and the second pilot symbol 4202 for modulation signal #1" and the "first pilot symbol 4201 for modulation signal #2 and the second pilot symbol 4202 for modulation signal #2" are orthogonal (zero cross-correlation) at a certain period.

[0581] Example 2) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #1 as shown in Figure 42. The first pilot symbol 4201 for modulated signal #1 is the PSK symbol, and the second pilot symbol 4202 for modulated signal #1 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the second pilot symbol 4202 for modulated signal #1 does not need to be called a pilot symbol).

[0582] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. The second pilot symbol 4201 for modulated signal #2 is the PSK symbol, and the first pilot symbol 4202 for modulated signal #2 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the first pilot symbol 4202 for modulated signal #2 does not need to be called a pilot symbol).

[0583] Furthermore, regarding the transmission method of data symbol groups #1 to #8 in the frame configuration shown in Figure 33... This may be set in the first preamble 201 and / or the second preamble 202.

[0584] In this case, the transmission method for data symbol groups #1 to #6 can be selected as either MIMO transmission or MISO transmission, or SISO transmission (SIMO transmission). The transmission method for data symbol groups #7 and #8 can also be selected as either MIMO transmission or MISO transmission, or SISO transmission (SIMO transmission).

[0585] In other words, the transmission method for the multiple data symbol groups between the "first preamble and second preamble set" and the "pilot symbol" is either "MIMO transmission or MISO transmission" or "SISO transmission (SIMO transmission)" (there is no mixing of MIMO transmission and SISO transmission (SIMO transmission), and no mixing of MISO transmission and SISO transmission (SIMO transmission)). Furthermore, the transmission method for the multiple data symbol groups between the "pilot symbol" and the next "first preamble and second preamble set" (however, the "first preamble and second preamble set" following the pilot symbol is not shown in Figure 33) is either "MIMO transmission or MISO transmission" or "SISO transmission (SIMO transmission)" (there is no mixing of MIMO transmission and SISO transmission (SIMO transmission), and no mixing of MISO transmission and SISO transmission (SIMO transmission)).

[0586] When SISO (SIMO) and MIMO (MISO) transmission methods are mixed, the receiving device experiences large fluctuations in the received field strength, requiring AD (Analog-to-Digital) conversion. In this process, quantization errors are likely to occur, which can lead to a deterioration in the quality of received data. However, by using the method described above, it becomes more likely that the occurrence of such phenomena can be suppressed, resulting in an improvement in the quality of received data.

[0587] However, this is not limited to the above.

[0588] Furthermore, the switching of the transmission method as described above also involves switching the method of inserting pilot symbols into the data symbol group, which has advantages in terms of improving data transmission efficiency (because SISO (SIMO) transmission and MIMO (MISO) transmission methods are not mixed). (If SISO (SIMO) transmission and MIMO (MISO) transmission methods are mixed, the frequency of inserting pilot symbols may become excessive, potentially reducing data transmission efficiency.) The configuration of the pilot symbols to be inserted into the data symbol group is as follows.

[0589] The method of constructing pilot symbols differs between "pilot symbols inserted into the data symbol group when performing SISO transmission" and "pilot symbols inserted into the data symbol group when performing MIMO transmission or MISO transmission." This point will be explained using a diagram. Figure 41 shows an example of inserting a pilot symbol into the data symbol group when performing SISO transmission. In Figure 41, the horizontal axis represents time and the vertical axis represents frequency. In Figure 41, 4101 represents the symbol of data symbol group #1, and 4102 represents the pilot symbol. In this case, symbol 4101 of data symbol group #1 is transmitting data, and pilot symbol 4102 is a symbol used by the receiving device to estimate frequency offset, frequency synchronization, time synchronization, signal detection, and channel estimation (estimation of radio wave propagation environment). For example, it is assumed to be composed of PSK (Phase Shift Keying) symbols known to the transmitting and receiving devices (it is highly likely that PSK symbols are required).

[0590] Figure 42 shows an example of inserting a pilot symbol into the data symbol set when MIMO or MISO transmission is being performed. In Figure 42, the horizontal axis represents time and the vertical axis represents frequency. When MIMO or MISO transmission is being performed, modulated signals are transmitted from two antennas, respectively. These are named modulated signal #1 and modulated signal #2. Figure 42 is used to show examples of inserting pilot symbols for both modulated signal #1 and modulated signal #2.

[0591] Example 1) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulation signal #1 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulation signal #1 are PSK symbols.

[0592] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 are PSK symbols.

[0593] Furthermore, the "first pilot symbol 4201 for modulation signal #1 and the second pilot symbol 4202 for modulation signal #1" and the "first pilot symbol 4201 for modulation signal #2 and the second pilot symbol 4202 for modulation signal #2" are orthogonal (zero cross-correlation) at a certain period.

[0594] Example 2) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #1 as shown in Figure 42. The first pilot symbol 4201 for modulated signal #1 is the PSK symbol, and the second pilot symbol 4202 for modulated signal #1 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the second pilot symbol 4202 for modulated signal #1 does not need to be called a pilot symbol).

[0595] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. The second pilot symbol 4201 for modulated signal #2 is the PSK symbol, and the first pilot symbol 4202 for modulated signal #2 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the first pilot symbol 4202 for modulated signal #2 does not need to be called a pilot symbol).

[0596] Similarly, in the frame configuration of Figure 37, the method for transmitting data symbol groups #1 to #15 may be set in the first preamble 201 and / or the second preamble 202.

[0597] At this time, the transmission method for data symbol groups #1 to #8 can be selected as either MIMO transmission or MISO transmission, or SISO transmission (SIMO transmission), and the transmission method for data symbol groups #9 to #13 can be either MIMO transmission or MISO transmission, or data symbol groups #9 to # The 13 transmission methods can be selected from either SISO transmission (SIMO transmission). The method of transmitting data symbol groups #14 and #15 may be either MIMO transmission or MISO transmission, or SISO transmission (SIMO transmission) may be selected.

[0598] In other words, the transmission method for the multiple data symbol groups between the "first preamble and second preamble set" and the "pilot symbol" is either "MIMO transmission or MISO transmission" or "SISO transmission (SIMO transmission)" (there is no mixing of MIMO transmission and SISO transmission (SIMO transmission), and no mixing of MISO transmission and SISO transmission (SIMO transmission)). Furthermore, the transmission method for the multiple data symbol groups between the "pilot symbol" and the next "first preamble and second preamble set" (however, the "first preamble and second preamble set" following the pilot symbol is not shown in Figure 37) is either "MIMO transmission or MISO transmission" or "SISO transmission (SIMO transmission)" (there is no mixing of MIMO transmission and SISO transmission (SIMO transmission), and no mixing of MISO transmission and SISO transmission (SIMO transmission)).

[0599] Furthermore, the transmission method for multiple data symbol groups between "pilot symbols" will be either "MIMO transmission or MISO transmission" or "SISO transmission (SIMO transmission)" (MIMO transmission and SISO transmission (SIMO transmission) will not be mixed, nor will MISO transmission and SISO transmission (SIMO transmission) be mixed).

[0600] When SISO (SIMO) and MIMO (MISO) transmission methods are mixed, the receiving device experiences large fluctuations in the received field strength, requiring AD (Analog-to-Digital) conversion. In this process, quantization errors are likely to occur, which can lead to a deterioration in the quality of received data. However, by using the method described above, it becomes more likely that the occurrence of such phenomena can be suppressed, resulting in an improvement in the quality of received data.

[0601] However, this is not limited to the above.

[0602] Furthermore, the switching of the transmission method as described above also involves switching the method of inserting pilot symbols into the data symbol group, which has advantages in terms of improving data transmission efficiency (because SISO (SIMO) transmission and MIMO (MISO) transmission methods are not mixed). (If SISO (SIMO) transmission and MIMO (MISO) transmission methods are mixed, the frequency of inserting pilot symbols may become excessive, potentially reducing data transmission efficiency.) The configuration of the pilot symbols to be inserted into the data symbol group is as follows.

[0603] The method of constructing pilot symbols differs between "pilot symbols inserted into the data symbol group when performing SISO transmission" and "pilot symbols inserted into the data symbol group when performing MIMO transmission or MISO transmission." This point will be explained using a diagram. Figure 41 shows an example of inserting a pilot symbol into the data symbol group when performing SISO transmission. In Figure 41, the horizontal axis is time and the vertical axis is frequency. In Figure 41, 4101 represents the symbol of data symbol group #1, and 4102 represents the pilot symbol. In this case, symbol 4101 of data symbol group #1 is transmitting data, and pilot symbol 4102 is a symbol used by the receiving device to perform frequency offset estimation, frequency synchronization, time synchronization, signal detection, and channel estimation (estimation of the radio wave propagation environment). For example, the transmitting device and receiving device may use a known PSK (Phase Shift Keying) symbol (that it is a PSK symbol). It is assumed to consist of (which are highly likely to be required).

[0604] Figure 42 shows an example of inserting a pilot symbol into the data symbol set when MIMO or MISO transmission is being performed. In Figure 42, the horizontal axis represents time and the vertical axis represents frequency. When MIMO or MISO transmission is being performed, modulated signals are transmitted from two antennas, respectively. These are named modulated signal #1 and modulated signal #2. Figure 42 is used to show examples of inserting pilot symbols for both modulated signal #1 and modulated signal #2.

[0605] Example 1) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulation signal #1 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulation signal #1 are PSK symbols.

[0606] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. Both the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 are PSK symbols.

[0607] Furthermore, the "first pilot symbol 4201 for modulation signal #1 and the second pilot symbol 4202 for modulation signal #1" and the "first pilot symbol 4201 for modulation signal #2 and the second pilot symbol 4202 for modulation signal #2" are orthogonal (zero cross-correlation) at a certain period.

[0608] Example 2) For modulated signal #1: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #1 as shown in Figure 42. The first pilot symbol 4201 for modulated signal #1 is the PSK symbol, and the second pilot symbol 4202 for modulated signal #1 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the second pilot symbol 4202 for modulated signal #1 does not need to be called a pilot symbol).

[0609] For modulated signal #2: Insert the first pilot symbol 4201 and the second pilot symbol 4202 for modulated signal #2 as shown in Figure 42. The second pilot symbol 4201 for modulated signal #2 is the PSK symbol, and the first pilot symbol 4202 for modulated signal #2 is a null symbol (common-mode component I is 0 (zero), orthogonal component Q is 0 (zero)) (therefore, the first pilot symbol 4202 for modulated signal #2 does not need to be called a pilot symbol).

[0610] (Embodiment 5) In Embodiment 4, Figures 30 to 38 were described as frames of modulated signals transmitted by the transmitting device in Figure 1. In Figures 30 to 38, data symbol groups are composed of cases where frequency division is used and cases where time division (time-based division) is used. In this case, it is necessary to accurately transmit the frequency resources (carrier) and time resources used by each data symbol group to the receiving device.

[0611] In this embodiment, an example of how to configure control information regarding the frequency (resource) and time (resource) used by each data symbol group in the frame configuration shown in Figures 30 to 38 will be described. Note that the frame configurations in Figures 30 to 38 are merely examples, and the detailed frame configuration requirements will be described in Embodiment 4.

[0612] <When frequency division is being performed> This section provides an example of how to generate control information regarding the frequency and time resources used by each data symbol group when frequency division is being performed.

[0613] Figure 43 shows an example of frequency division of the data symbol group in a frame of the modulated signal transmitted by the transmitting device in Figure 1. In Figure 43, the vertical axis represents frequency and the horizontal axis represents time. As with Embodiments 1 to 4, the data symbol group may be symbols of any of the following methods: SISO (SIMO), MIMO, or MISO.

[0614] In Figure 43, 4301 is a symbol of data symbol group #1, and data symbol group #1 (4301) is transmitted using carriers 1 through 5 and time zones 1 through 16. (However, "carrier 1" is used as the first index of the carriers, but this is not the only option, and "time zone 1" is used as the first index of the time zones, but this is not the only option).

[0615] 4302 is a symbol in data symbol group #2, and data symbol group #2 (4302) is transmitted using carriers 6 through 9 and time zones 1 through 5.

[0616] 4303 is a symbol in data symbol group #3, and data symbol group #3 (4303) is transmitted using carriers 10 through 14 and time zones 1 through 16.

[0617] 4304 is a symbol in data symbol group #4, and data symbol group #4 (4304) is transmitted using carriers 6 through 9 and time zones 6 through 12.

[0618] 4305 is a symbol in data symbol group #5, and data symbol group #5 (4305) is transmitted using carriers 6 through 9 and time zones 13 through 16.

[0619] <Example 1> At this point, we will explain examples of control information regarding frequency and time used by each data symbol group.

[0620] The control information regarding the initial position of the carrier used by the data symbol group #j is m(j,0), m(j,1), m(j,2), m(j,3), The control information regarding the number of carriers used by the data symbol group #j is n(j,0), n(j,1), n(j,2), n(j,3), The control information for the initial time position used by the data symbol group #j is o(j,0), o(j,1), o(j,2), o(j,3), The control information regarding the time number used by the data symbol group #j is p(j,0), p(j,1), p(j,2), p(j,3), Let's assume that.

[0621] In this case, if the initial position of the carrier used by the data symbol group #(j=K) is set to "carrier 1", then m(K,0)=0, m(K,1)=0, m(K,2)=0, and m(K,3)=0 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0622] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 2", then m(K,0)=1, m(K,1)=0, m(K,2)=0, and m(K,3)=0 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0623] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 3", then m(K,0)=0, m(K,1)=1, m(K,2)=0, and m(K,3)=0 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0624] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 4", then m(K,0)=1, m(K,1)=1, m(K,2)=0, and m(K,3)=0 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0625] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 5", then m(K,0)=0, m(K,1)=0, m(K,2)=1, and m(K,3)=0 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0626] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 6", then m(K,0)=1, m(K,1)=0, m(K,2)=1, and m(K,3)=0 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0627] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 7", then m(K,0)=0, m(K,1)=1, m(K,2)=1, and m(K,3)=0 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0628] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 8", then m(K,0)=1, m(K,1)=1, m(K,2)=1, and m(K,3)=0 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0629] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 9", then m(K,0)=0, m(K,1)=0, m(K,2)=0, and m(K,3)=1 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0630] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 10", then m(K,0)=1, m(K,1)=0, m(K,2)=0, and m(K,3)=1 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0631] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 11", then m(K,0)=0, m(K,1)=1, m(K,2)=0, and m(K,3)=1 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0632] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 12", then m(K,0)=1, m(K,1)=1, m(K,2)=0, and m(K,3)=1 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0633] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 13", then m(K,0)=0, m(K,1)=0, m(K,2)=1, and m(K,3)=1 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0634] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 14", then m(K,0)=1, m(K,1)=0, m(K,2)=1, and m(K,3)=1 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0635] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 15", then m(K,0)=0, m(K,1)=1, m(K,2)=1, and m(K,3)=1 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0636] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 16", then m(K,0)=1, m(K,1)=1, m(K,2)=1, and m(K,3)=1 are set, and the transmitting device transmits m(K,0), m(K,1), m(K,2), and m(K,3).

[0637] If the number of carriers used by data symbol group #(j=K) is set to 1 carrier, then n(K,0)=0, n(K,1)=0, n(K,2)=0, and n(K,3)=0 are set, and the transmitting device shall transmit n(K,0), n(K,1), n(K,2), and n(K,3).

[0638] If the data symbol group #(j=K) uses 2 carriers, then n(K,0)=1, n(K,1)=0, n(K,2)=0, and n(K,3)=0 are set, and the transmitting device transmits n(K,0), n(K,1), n(K,2), and n(K,3).

[0639] If the data symbol group #(j=K) uses 3 carriers, then n(K,0)=0, n(K,1)=1, n(K,2)=0, and n(K,3)=0 are set, and the transmitting device transmits n(K,0), n(K,1), n(K,2), and n(K,3).

[0640] If the data symbol group #(j=K) uses 4 carriers, then n(K,0)=1, n(K,1)=1, n(K,2)=0, and n(K,3)=0 are set, and the transmitting device transmits n(K,0), n(K,1), n(K,2), and n(K,3).

[0641] If the data symbol group #(j=K) uses 5 carriers, then n(K,0)=0, n(K,1)=0, n(K,2)=1, and n(K,3)=0 are set, and the transmitting device transmits n(K,0), n(K,1), n(K,2), and n(K,3).

[0642] If the data symbol group #(j=K) uses 6 carriers, then n(K,0)=1, n(K,1)=0, n(K,2)=1, and n(K,3)=0 are set, and the transmitting device transmits n(K,0), n(K,1), n(K,2), and n(K,3).

[0643] If the data symbol group #(j=K) uses 7 carriers, then n(K,0)=0, n(K,1)=1, n(K,2)=1, and n(K,3)=0 are set, and the transmitting device transmits n(K,0), n(K,1), n(K,2), and n(K,3).

[0644] If the data symbol group #(j=K) uses 8 carriers, then n(K,0)=1, n(K,1)=1, n(K,2)=1, and n(K,3)=0 are set, and the transmitting device transmits n(K,0), n(K,1), n(K,2), and n(K,3).

[0645] If the data symbol group #(j=K) uses 9 carriers, then n(K,0)=0, n(K,1)=0, n(K,2)=0, and n(K,3)=1 are set, and the transmitting device transmits n(K,0), n(K,1), n(K,2), and n(K,3).

[0646] If the number of carriers used for the data symbol group #(j=K) is 10, then n(K,0)=1, n(K,1)=0, n(K,2)=0, and n(K,3)=1 are set, and the transmitting device shall transmit n(K,0), n(K,1), n(K,2), and n(K,3).

[0647] If the data symbol group #(j=K) uses 11 carriers, then n(K,0)=0, n(K,1)=1, n(K,2)=0, and n(K,3)=1 are set, and the transmitting device transmits n(K,0), n(K,1), n(K,2), and n(K,3).

[0648] If the data symbol group #(j=K) uses 12 carriers, then n(K,0)=1, n(K,1)=1, n(K,2)=0, and n(K,3)=1 are set, and the transmitting device transmits n(K,0), n(K,1), n(K,2), and n(K,3).

[0649] If the data symbol group #(j=K) uses 13 carriers, then n(K,0)=0, n(K,1)=0, n(K,2)=1, and n(K,3)=1 are set, and the transmitting device transmits n(K,0), n(K,1), n(K,2), and n(K,3).

[0650] If the data symbol group #(j=K) uses 14 carriers, then n(K,0)=1, n(K,1)=0, n(K,2)=1, and n(K,3)=1 are set, and the transmitting device transmits n(K,0), n(K,1), n(K,2), and n(K,3).

[0651] If the number of carriers used by data symbol group #(j=K) is 15, then n(K,0)=0, n(K,1)=1, n(K,2)=1, and n(K,3)=1 are set, and the transmitting device will transmit n(K,0), n(K,1), n(K,2), and n(K,3).

[0652] If the data symbol group #(j=K) uses 16 carriers, then n(K,0)=1, n(K,1)=1, n(K,2)=1, and n(K,3)=1 are set, and the transmitting device transmits n(K,0), n(K,1), n(K,2), and n(K,3).

[0653] If the initial position of the time used by the data symbol group #(j=K) is set to "Time 1", then o(K,0)=0, o(K,1)=0, o(K,2)=0, and o(K,3)=0 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0654] If the initial time position used by the data symbol group #(j=K) is set to "Time 2", then o(K,0)=1, o(K,1)=0, o(K,2)=0, and o(K,3)=0 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0655] If the initial time position used by the data symbol group #(j=K) is set to "time 3", then o(K,0)=0, o(K,1)=1, o(K,2)=0, and o(K,3)=0 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0656] If the initial time position used by the data symbol group #(j=K) is set to "time 4", then o(K,0)=1, o(K,1)=1, o(K,2)=0, and o(K,3)=0 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0657] If the initial time position used by the data symbol group #(j=K) is set to "time 5", then o(K,0)=0, o(K,1)=0, o(K,2)=1, and o(K,3)=0 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0658] If the initial time position used by the data symbol group #(j=K) is set to "time 6", then o(K,0)=1, o(K,1)=0, o(K,2)=1, and o(K,3)=0 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0659] If the initial time position used by the data symbol group #(j=K) is set to "time 7", then o(K,0)=0, o(K,1)=1, o(K,2)=1, and o(K,3)=0 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0660] If the initial time position used by the data symbol group #(j=K) is set to "time 8", then o(K,0)=1, o(K,1)=1, o(K,2)=1, and o(K,3)=0 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0661] If the initial time position used by the data symbol group #(j=K) is set to "time 9", then o(K,0)=0, o(K,1)=0, o(K,2)=0, and o(K,3)=1 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0662] If the initial time position used by the data symbol group #(j=K) is set to "time 10", then o(K,0)=1, o(K,1)=0, o(K,2)=0, and o(K,3)=1 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0663] If the initial time position used by the data symbol group #(j=K) is set to "time 11", then o(K,0)=0, o(K,1)=1, o(K,2)=0, and o(K,3)=1 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0664] If the initial time position used by the data symbol group #(j=K) is set to "time 12", then o(K,0)=1, o(K,1)=1, o(K,2)=0, and o(K,3)=1 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0665] If the initial time position used by the data symbol group #(j=K) is set to "time 13", then o(K,0)=0, o(K,1)=0, o(K,2)=1, and o(K,3)=1 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0666] If the initial time position used by the data symbol group #(j=K) is set to "time 14", then o(K,0)=1, o(K,1)=0, o(K,2)=1, and o(K,3)=1 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0667] If the initial time position used by the data symbol group #(j=K) is set to "time 15", then o(K,0)=0, o(K,1)=1, o(K,2)=1, and o(K,3)=1 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0668] If the initial time position used by the data symbol group #(j=K) is set to "time 16", then o(K,0)=1, o(K,1)=1, o(K,2)=1, and o(K,3)=1 are set, and the transmitting device transmits o(K,0), o(K,1), o(K,2), and o(K,3).

[0669] If the number of time points used for data symbol group #(j=K) is set to 1, then p(K,0)=0, p(K,1)=0, p(K,2)=0, and p(K,3)=0 are set, and the transmitting device shall transmit p(K,0), p(K,1), p(K,2), and p(K,3).

[0670] If the number of time points used for data symbol group #(j=K) is set to 2, then p(K,0)=1, p(K,1)=0, p(K,2)=0, and p(K,3)=0 are set, and the transmitting device will transmit p(K,0), p(K,1), p(K,2), and p(K,3).

[0671] If the number of time points used for data symbol group #(j=K) is set to 3, then p(K,0)=0, p(K,1)=1, p(K,2)=0, and p(K,3)=0 are set, and the transmitting device will transmit p(K,0), p(K,1), p(K,2), and p(K,3).

[0672] If the number of time points used for data symbol group #(j=K) is set to 4, then p(K,0)=1, p(K,1)=1, p(K,2)=0, and p(K,3)=0 are set, and the transmitting device transmits p(K,0), p(K,1), p(K,2), and p(K,3).

[0673] If the number of time points used for data symbol group #(j=K) is set to 5, then p(K,0)=0, p(K,1)=0, p(K,2)=1, and p(K,3)=0 are set, and the transmitting device transmits p(K,0), p(K,1), p(K,2), and p(K,3).

[0674] If the number of time points used for data symbol group #(j=K) is set to 6, then p(K,0)=1, p(K,1)=0, p(K,2)=1, and p(K,3)=0 are set, and the transmitting device transmits p(K,0), p(K,1), p(K,2), and p(K,3).

[0675] If the number of time points used for data symbol group #(j=K) is set to 7, then p(K,0)=0, p(K,1)=1, p(K,2)=1, and p(K,3)=0 are set, and the transmitting device will transmit p(K,0), p(K,1), p(K,2), and p(K,3).

[0676] If the number of time points used for data symbol group #(j=K) is set to 8, then p(K,0)=1, p(K,1)=1, p(K,2)=1, and p(K,3)=0 are set, and the transmitting device transmits p(K,0), p(K,1), p(K,2), and p(K,3).

[0677] If the number of time points used for data symbol group #(j=K) is set to 9, then p(K,0)=0, p(K,1)=0, p(K,2)=0, and p(K,3)=1 are set, and the transmitting device transmits p(K,0), p(K,1), p(K,2), and p(K,3).

[0678] If the number of time points used for the data symbol group #(j=K) is set to 10, then p(K,0)=1, p(K,1)=0, p(K,2)=0, and p(K,3)=1, and the transmitting device shall transmit p(K,0), p(K,1), p(K,2), and p(K,3).

[0679] If the number of time points used for data symbol group #(j=K) is set to 11, then p(K,0)=0, p(K,1)=1, p(K,2)=0, and p(K,3)=1 are set, and the transmitting device transmits p(K,0), p(K,1), p(K,2), and p(K,3).

[0680] If the number of time points used for data symbol group #(j=K) is set to 12, then p(K,0)=1, p(K,1)=1, p(K,2)=0, and p(K,3)=1 are set, and the transmitting device transmits p(K,0), p(K,1), p(K,2), and p(K,3).

[0681] If the number of time points used for data symbol group #(j=K) is set to 13, then p(K,0)=0, p(K,1)=0, p(K,2)=1, and p(K,3)=1 are set, and the transmitting device transmits p(K,0), p(K,1), p(K,2), and p(K,3).

[0682] If the number of time points used for data symbol group #(j=K) is set to 14, then p(K,0)=1, p(K,1)=0, p(K,2)=1, and p(K,3)=1 are set, and the transmitting device transmits p(K,0), p(K,1), p(K,2), and p(K,3).

[0683] If the number of time points used for data symbol group #(j=K) is set to 15, then p(K,0)=0, p(K,1)=1, p(K,2)=1, and p(K,3)=1 are set, and the transmitting device will transmit p(K,0), p(K,1), p(K,2), and p(K,3).

[0684] If the number of time points used for data symbol group #(j=K) is set to 16, then p(K,0)=1, p(K,1)=1, p(K,2)=1, and p(K,3)=1 are set, and the transmitting device will transmit p(K,0), p(K,1), p(K,2), and p(K,3).

[0685] Next, we will explain data symbol group #3 as an example.

[0686] Data symbol group #3 (4303) is transmitted using carriers 10 through 14 and time zones 1 through 16.

[0687] Therefore, the initial position of the carrier is carrier 10. Thus, m(3,0)=1 Assuming m(3,1)=0, m(3,2)=0, and m(3,3)=1, the transmitting device transmits m(3,0), m(3,1), m(3,2), and m(3,3).

[0688] Furthermore, the number of carriers used is 5. Therefore, with n(3,0)=0, n(3,1)=0, n(3,2)=1, and n(3,3)=0, the transmitter transmits n(3,0), n(3,1), n(3,2), and n(3,3).

[0689] The initial position in time is time 1. Therefore, with o(3,0)=0, o(3,1)=0, o(3,2)=0, and o(3,3)=0, the transmitter transmits o(3,0), o(3,1), o(3,2), and o(3,3).

[0690] Furthermore, the number of time points used is 16. Therefore, with p(3,0)=1, p(3,1)=1, p(3,2)=1, and p(3,3)=1, the transmitting device transmits p(3,0), p(3,1), p(3,2), and p(3,3).

[0691] <Example 2> Figure 44 shows an example of the frame configuration of the modulated signal transmitted by the transmitter in Figure 1, where the data symbol group is frequency-divided. In Figure 44, elements common to Figure 43 are given the same numbers, and the vertical axis represents frequency and the horizontal axis represents time. As with Embodiments 1 to 4, the data symbol group may be symbols of any of the following methods: SISO (SIMO), MIMO, or MISO.

[0692] Figure 44 differs from Figure 43 in that each data symbol group has, for example, 4 × A number of carriers (where A is an integer greater than or equal to 1) (using carriers that are multiples of 4 (excluding 0)) and 4 × B number of time points (where B is a natural number greater than or equal to 1) (using time points that are multiples of 4 (excluding 0)). However, the number of carriers used by each data symbol group is not limited to multiples of 4, but can be any multiple of C (where C is an integer greater than or equal to 2), excluding 0. Also, the number of time points used by each data symbol group is not limited to multiples of 4, but can be any multiple of D (where D is an integer greater than or equal to 2), excluding 0.

[0693] In Figure 44, 4301 is a symbol of data symbol group #1, and data symbol group #1 (4301) is transmitted using carriers 1 through 8 (8 carriers, multiples of 4) and time points 1 through 16 (time point number 16, multiples of 4). (However, "carrier 1" is used as the first index of the carriers, but this is not the only option, and "time point 1" is used as the first index of the time points, but this is not the only option).

[0694] 4302 is a symbol in data symbol group #2, and data symbol group #2 (4302) is transmitted using carriers 9 through 12 (using 4 carriers, or multiples of 4) and time points 1 through 4 (time point number 4, or multiples of 4).

[0695] 4303 is a symbol in data symbol group #3, and data symbol group #3 (4303) is transmitted using carriers 13 through 16 (using 4 carriers, or multiples of 4), and time intervals 1 through 16 (time interval 16, which is a multiple of 4).

[0696] 4304 is the symbol for data symbol group #4, and data symbol group #4 (4304) is transmitted using carriers 9 through 12 (using 4 carriers, or multiples of 4), and time zones 5 through 12 (time zone 8, or multiples of 4).

[0697] 4305 is the symbol for data symbol group #5, and data symbol group #5 (4305) is transmitted using carriers 9 through 12 (using 4 carriers, or multiples of 4) and time intervals 13 through 16 (time interval 4, or multiples of 4).

[0698] When each data symbol group is assigned to a frame according to these rules, as explained above, • Number of bits for "control information regarding the initial position of the carrier used by data symbol group #j" • Number of bits in "Control information regarding the number of carriers used by data symbol group #j" • Number of bits for "control information regarding the initial time position used by data symbol group #j" • Number of bits for "Control information regarding the timestamp used by data symbol group #j" This can reduce overhead and improve the efficiency of data (information) transmission.

[0699] In this case, the control information can be defined as follows:

[0700] The control information for the initial position of the carrier used by data symbol group #j is m(j,0) and m(j,1). The control information regarding the number of carriers used by the data symbol group #j is n(j,0), n(j,1), The control information for the initial time position used by the data symbol group #j is o(j,0), o(j,1), The control information regarding the number of time points used by the data symbol group #j is p(j,0), p(j,1), Let's assume that.

[0701] In this case, if the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 1", then m(K,0)=0 and m(K,1)=0 are set, and the transmitting device transmits m(K,0) and m(K,1).

[0702] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 5", then m(K,0)=1 and m(K,1)=0 are set, and the transmitting device transmits m(K,0) and m(K,1).

[0703] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 9", then m(K,0)=0 and m(K,1)=1 are set, and the transmitting device transmits m(K,0) and m(K,1).

[0704] If the initial position of the carrier used by data symbol group #(j=K) is set to "carrier 13", then m(K,0)=1 and m(K,1)=1 are set, and the transmitting device transmits m(K,0) and m(K,1).

[0705] If the data symbol group #(j=K) uses 4 carriers, then n(K,0)=0 and n(K,1)=0 are set, and the transmitting device transmits n(K,0) and n(K,1).

[0706] If the data symbol group #(j=K) uses 8 carriers, then n(K,0)=1 and n(K,1)=0 are set, and the transmitting device transmits n(K,0) and n(K,1).

[0707] If the number of carriers used in the data symbol group #(j=K) is 12, then n( Set K,0)=0 and n(K,1)=1, and the transmitting device will transmit n(K,0) and n(K,1).

[0708] If the data symbol group #(j=K) uses 16 carriers, then n(K,0)=1 and n(K,1)=1 are set, and the transmitting device transmits n(K,0) and n(K,1).

[0709] If the initial time position used by the data symbol group #(j=K) is set to "Time 1", then o(K,0)=0 and o(K,1)=0 are set, and the transmitting device transmits o(K,0) and o(K,1).

[0710] If the initial time position used by the data symbol group #(j=K) is set to "time 5", then o(K,0)=1 and o(K,1)=0 are set, and the transmitting device transmits o(K,0) and o(K,1).

[0711] If the initial time position used by the data symbol group #(j=K) is set to "time 9", then o(K,0)=0 and o(K,1)=1 are set, and the transmitting device transmits o(K,0) and o(K,1).

[0712] If the initial time position used by the data symbol group #(j=K) is set to "time 13", then o(K,0)=1 and o(K,1)=1 are set, and the transmitting device transmits o(K,0) and o(K,1).

[0713] If the number of time points used for data symbol group #(j=K) is set to 4, then p(K,0)=0 and p(K,1)=0 are set, and the transmitting device transmits p(K,0) and p(K,1).

[0714] If the number of time points used for data symbol group #(j=K) is set to 8, then p(K,0)=1 and p(K,1)=0 are set, and the transmitting device transmits p(K,0) and p(K,1).

[0715] If the number of time points used for data symbol group #(j=K) is set to 12, then p(K,0)=0 and p(K,1)=1 are set, and the transmitting device transmits p(K,0) and p(K,1).

[0716] If the number of time points used for data symbol group #(j=K) is set to 16, then p(K,0)=1 and p(K,1)=1 are set, and the transmitting device transmits p(K,0) and p(K,1).

[0717] Next, we will explain data symbol group #4 as an example.

[0718] 4304 is the symbol for data symbol group #4, and data symbol group #4 (4304) is transmitted using carriers 9 through 12 (using 4 carriers, or multiples of 4), and time zones 5 through 12 (time zone 8, or multiples of 4).

[0719] Therefore, the initial position of the carrier is carrier 9. Thus, with m(3,0)=0 and m(3,1)=1, the transmitter transmits m(3,0) and m(3,1).

[0720] Furthermore, the number of carriers used is 4. Therefore, with n(3,0)=0 and n(3,1)=0, the transmitting device transmits n(3,0) and n(3,1).

[0721] The initial position in time is time 5. Therefore, with o(3,0)=1 and o(3,1)=0, the transmitter transmits o(3,0) and o(3,1).

[0722] Furthermore, the number of time points used is 8. Therefore, with p(3,0)=1 and p(3,1)=0, the transmitting device transmits p(3,0) and p(3,1).

[0723] <Third example> When the frame configuration of the modulated signal transmitted by the transmitting device in Figure 1 is as shown in Figure 44, a different method of transmitting control information than in the second example will be described.

[0724] In Figure 44, each data symbol group is assumed to have, for example, 4 × A number of carriers (where A is an integer greater than or equal to 1) (using carriers that are multiples of 4 (excluding 0)) and 4 × B number of time points (where B is a natural number greater than or equal to 1) (using time points that are multiples of 4 (excluding 0)). However, the number of carriers used by each data symbol group is not limited to multiples of 4, but can be any multiple of C (where C is an integer greater than or equal to 2), excluding 0. Also, the number of time points used by each data symbol group is not limited to multiples of 4, but can be any multiple of D (where D is an integer greater than or equal to 2), excluding 0.

[0725] Therefore, area decomposition is performed as shown in Figure 45. In Figure 45, the vertical axis represents frequency and the horizontal axis represents time. And, as in Figure 44, we assume that there are carriers 1 to 16 and time points 1 to 16. Note that in Figure 45, each area is composed of 4 x 4 = 16 symbols, with 4 carriers in the carrier direction and 4 time points in the time direction. (If generalized using C and D as explained above, each area would be composed of C carriers in the carrier direction and C x D symbols, with D time points in the time direction).

[0726] In Figure 45, Area 4400, which consists of carriers 1 through 4 and time zones 1 through 4, is named Area #0.

[0727] Area 4401, consisting of carriers 5 through 8 and time zones 1 through 4, will be named Area #1.

[0728] Area 4402, consisting of carriers 9 through 12 and time zones 1 through 4, will be named Area #2.

[0729] Area 4403, consisting of carriers 13 through 16 and time zones 1 through 4, will be named Area #3.

[0730] Area 4404, consisting of carriers 1 through 4 and time zones 5 through 8, will be named Area #4.

[0731] Area 4405, which consists of carriers 5 through 8 and time zones 5 through 8, will be named Area #5.

[0732] Area 4406, consisting of carriers 9 through 12 and time zones 5 through 8, will be named Area #6.

[0733] Area 4407, consisting of carriers 13 through 16 and time zones 5 through 8, will be named Area #7.

[0734] Area 4408, consisting of carriers 1 through 4 and time zones 9 through 12, will be named Area #8.

[0735] Area 4409, which consists of carriers 5 through 8 and time zones 9 through 12, will be named Area #9.

[0736] Area 4410, which consists of carriers 9 through 12 and time zones 9 through 12, will be named Area #10.

[0737] Area 4411, consisting of carriers 13 through 16 and time zones 9 through 12, will be named Area #11.

[0738] Area 4412, consisting of carriers 1 through 4 and time zones 13 through 16, will be named Area #12.

[0739] Area 4413, consisting of carriers 5 through 8 and time zones 13 through 16, will be named Area #13.

[0740] Area 4414, consisting of carriers 9 through 12 and time zones 13 through 16, will be named Area #14.

[0741] Area 4415, consisting of carriers 13 through 16 and time zones 13 through 16, will be named Area #15.

[0742] At this time, the transmitting device in Figure 1 transmits control information to the receiving device in order to convey information about the frequency and time resources used by each data symbol group, as shown in the following example.

[0743] When data symbol group #1 in Figure 44 is decomposed into areas as shown in Figure 45, it transmits data (information) using areas #0 (4400), #1 (4401), #4 (4404), #5 (4405), #8 (4408), #9 (4409), #12 (4412), and #13 (4413). Therefore, as data symbol group #1, "We are using Area #0 (4400), Area #1 (4401), Area #4 (4404), Area #5 (4405), Area #8 (4408), Area #9 (4409), Area #12 (4412), and Area #13 (4413)." The transmitting device in Figure 1 transmits the control information as follows. At this time, the control information will include area information (Area #0 (4400), Area #1 (4401), Area #4 (4404), Area #5 (4405), Area #8 (4408), Area #9 (4409), Area #12 (4412), Area #13 (4413)).

[0744] Similarly, as data symbol group #2 in Figure 44, "Using area #2 (4402)" The transmitting device in Figure 1 transmits this control information. At this time, the control information will include area information (Area #2 (4402)).

[0745] As data symbol group #3 in Figure 44, "Using Area #3 (4403), Area #7 (4407), Area #11 (4411), and Area #15 (4415)" The transmitting device in Figure 1 transmits the following control information. At this time, the control information includes area information. This includes areas #3 (4403), #7 (4407), #11 (4411), and #15 (4415).

[0746] As data symbol group #4 in Figure 44, "Using Area #6 (4406) and Area #10 (4410)" The transmitting device in Figure 1 transmits this control information. At this time, the control information will include area information (area #6 (4406), area #10 (4410)).

[0747] As data symbol group #5 in Figure 44, "Using area #14 (4414)" The transmitting device in Figure 1 transmits this control information. At this time, the control information will include area information (area #14 (4414)).

[0748] In the above examples, the second and third examples have the advantage of being able to transmit information about usage time and frequency resources with a small number of bits.

[0749] On the other hand, the first example has the advantage of allowing for more flexible allocation of time and frequency resources to the data symbol set.

[0750] <When time division is being performed> This section provides an example of generating control information regarding the frequency and time resources used by each data symbol group when time division is being performed.

[0751] <Example 4> Even when time division is performed, control information is transmitted in the same way as when frequency division is performed. Therefore, the first example described above is implemented.

[0752] <Example 5> Even when time division is performed, control information is transmitted in the same way as when frequency division is performed. Therefore, the second example described above is implemented.

[0753] <Example 6> Even when time division is being performed, control information is transmitted in the same way as when frequency division is being performed. Therefore, the third example described above is implemented.

[0754] <Example 7> The e(X,Y) described in Embodiment 2 is transmitted as control information. In other words, e(j,0) and e(j,1) are the information regarding the number of symbols in the frame of data symbol group #j.

[0755] At this time, for example, If the number of symbols in a frame of data symbol group #(j=K) is 256, then e(K,0)=0 and e(K,1)=0 are set, and the transmitting device transmits e(K,0) and e(K,1).

[0756] If the number of symbols in a frame of data symbol group #(j=K) is 512, then e(K,0)=1 and e(K,1)=0 are set, and the transmitting device transmits e(K,0) and e(K,1).

[0757] The number of symbols in the frame of data symbol set #(j=K) is set to 1024 symbols. In this case, e(K,0)=0 and e(K,1)=1 are set, and the transmitting device transmits e(K,0) and e(K,1).

[0758] If the number of symbols in the frame of data symbol group #(j=K) is 2048 symbols, then e(K,0)=1 and e(K,1)=1 are set, and the transmitting device transmits e(K,0) and e(K,1).

[0759] Furthermore, the number of symbols is not limited to four; it is sufficient for the transmitting device to be able to set one or more different numbers of symbols.

[0760] <Example 8> The transmitting device sends information to the receiving device indicating the number of times each data symbol is required. The receiving device then receives this information and can determine the frequency and time resources used by each data symbol.

[0761] For example, let q(j,0), q(j,1), q(j,2), and q(j,3) represent information about the number of time points used in a frame of data symbol group #j.

[0762] If the number of time points used for data symbol group #(j=K) is set to 1, then q(K,0)=0, q(K,1)=0, q(K,2)=0, and q(K,3)=0 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0763] If the number of time points used for data symbol group #(j=K) is set to 2, then q(K,0)=1, q(K,1)=0, q(K,2)=0, and q(K,3)=0 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0764] If the number of time points used for data symbol group #(j=K) is set to 3, then q(K,0)=0, q(K,1)=1, q(K,2)=0, and q(K,3)=0 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0765] If the number of time points used for data symbol group #(j=K) is set to 4, then q(K,0)=1, q(K,1)=1, q(K,2)=0, and q(K,3)=0 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0766] If the number of time points used for data symbol group #(j=K) is set to 5, then q(K,0)=0, q(K,1)=0, q(K,2)=1, and q(K,3)=0 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0767] If the number of time points used for data symbol group #(j=K) is set to 6, then q(K,0)=1, q(K,1)=0, q(K,2)=1, and q(K,3)=0 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0768] If the number of time points used for data symbol group #(j=K) is set to 7, then q(K,0)=0, q(K,1)=1, q(K,2)=1, and q(K,3)=0 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0769] If the number of time points used for data symbol group #(j=K) is set to 8, then q(K,0)=1, q(K,1)=1, q(K,2)=1, and q(K,3)=0 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0770] If the number of time points used for data symbol group #(j=K) is set to 9, then q(K,0)=0, q(K,1)=0, q(K,2)=0, and q(K,3)=1 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0771] If the number of time points used for the data symbol group #(j=K) is set to 10, then q(K,0)=1, q(K,1)=0, q(K,2)=0, and q(K,3)=1 are set, and the transmitting device shall transmit q(K,0), q(K,1), q(K,2), and q(K,3).

[0772] If the number of time points used for data symbol group #(j=K) is set to 11, then q(K,0)=0, q(K,1)=1, q(K,2)=0, and q(K,3)=1 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0773] If the number of time points used for data symbol group #(j=K) is set to 12, then q(K,0)=1, q(K,1)=1, q(K,2)=0, and q(K,3)=1 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0774] If the number of time points used for data symbol group #(j=K) is set to 13, then q(K,0)=0, q(K,1)=0, q(K,2)=1, and q(K,3)=1 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0775] If the number of time points used for data symbol group #(j=K) is set to 14, then q(K,0)=1, q(K,1)=0, q(K,2)=1, and q(K,3)=1 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0776] If the number of time points used for data symbol group #(j=K) is set to 15, then q(K,0)=0, q(K,1)=1, q(K,2)=1, and q(K,3)=1 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0777] If the number of time points used for data symbol group #(j=K) is set to 16, then q(K,0)=1, q(K,1)=1, q(K,2)=1, and q(K,3)=1 are set, and the transmitting device transmits q(K,0), q(K,1), q(K,2), and q(K,3).

[0778] Figure 46 shows an example of how the data symbol group is divided into time segments in a frame of a modulated signal transmitted by the transmitting device in Figure 1. In Figure 46, the vertical axis represents frequency and the horizontal axis represents time. As with Embodiments 1 to 4, the data symbol group may be symbols of any of the following methods: SISO (SIMO), MIMO, or MISO.

[0779] In Figure 46, 4301 is a symbol of data symbol group #1, and data symbol group #1 (4301) is transmitted using carriers 1 through 16 (all carriers that can be assigned as data symbols are used, excluding carriers for placing pilot symbols or carriers for transmitting control information) and time zones 1 through 4. (However, "carrier 1" is used as the first index of the carriers, but is not limited to this, and "time zone 1" is used as the first index of the time zone, but is not limited to this).

[0780] 4302 is a symbol of data symbol group #2, and data symbol group #2 (4302) uses carriers 1 through 16 (all carriers that can be assigned as data symbols, excluding carriers used for placing pilot symbols or carriers that transmit control information) and time zones 5 through 12. , sent.

[0781] 4303 is a symbol in data symbol group #3, and data symbol group #3 (4303) is transmitted using carriers 1 through 16 (all carriers that can be assigned as data symbols are used, excluding carriers used for placing pilot symbols or carriers that transmit control information) and time 13 through 16.

[0782] For example, in the case of data symbol group #2, time points 5 through 12 are used for transmission, meaning the number of time points is 8. Therefore, setting q(2,0)=1, q(2,1)=1, q(2,2)=1, and q(2,3)=0, the transmitting device will transmit q(2,0), q(2,1), q(2,2), and q(2,3).

[0783] Similarly, control information can be generated for data symbol group #1 and data symbol #3, and the transmitter in Figure 1 transmits q(1,0), q(1,1), q(1,2), q(1,3), and q(2,0), q(2,1), q(2,2), q(2,3), and q(3,0), q(3,1), q(3,2), q(3,3).

[0784] The receiver in Figure 23 receives q(1,0), q(1,1), q(1,2), q(1,3), and q(2,0), q(2,1), q(2,2), q(2,3), and q(3,0), q(3,1), q(3,2), q(3,3), and knows the frequency and time resources used by the data symbol groups. In this case, if the transmitter and receiver share the understanding that, for example, "data symbol group #1 is placed first in time, followed by data symbol group #2, data symbol group #3, data symbol group #4, data symbol group #5, ...", then by knowing the number of times each data symbol group uses, the frequency and time resources used by each data symbol group can be determined. (The transmitter no longer needs to transmit information about the initial time when each data symbol group is placed. This improves data transmission efficiency).

[0785] <Example 9> Unlike Example 8, each data symbol group has, for example, 4 × B times (where B is a natural number greater than or equal to 1) (using times that are multiples of 4 (excluding 0)). However, the number of times used by each data symbol group is not limited to multiples of 4, but can be any multiple of D (where D is an integer greater than or equal to 2), excluding 0.

[0786] In Figure 46, 4301 is a symbol of data symbol group #1, and data symbol group #1 (4301) is transmitted using carriers 1 through 16 (all carriers that can be assigned as data symbols are used (excluding carriers for placing pilot symbols or carriers for transmitting control information)) and time points 1 through 4 (time point number 4, and multiples of 4). (However, "carrier 1" is used as the first index of the carriers, but is not limited to this, and "time point 1" is used as the first index of the time points, but is not limited to this).

[0787] 4302 is a symbol in data symbol group #2, and data symbol group #2 (4302) is transmitted using carriers 1 through 16 (all carriers that can be assigned as data symbols, excluding carriers used for placing pilot symbols or carriers that transmit control information) and time zones 5 through 12 (time zone number 8, which is a multiple of 4).

[0788] 4303 is a symbol of data symbol group #3, and data symbol group #3(430 3) is transmitted using carriers 1 through 16 (all carriers that can be assigned as data symbols, excluding carriers used for placing pilot symbols or carriers that transmit control information) and time 13 through 16 (time number 4, and multiples of 4).

[0789] When each data symbol group is assigned to a frame according to these rules, as explained above, • Number of bits for "Information about the number of timestamps used in the frame of data symbol group #j" This can reduce overhead and improve the efficiency of data (information) transmission.

[0790] In this case, the control information can be defined as follows:

[0791] Let q(j,0) and q(j,1) represent information about the number of time points used in the frame of data symbol group #j.

[0792] If the number of time points used for data symbol group #(j=K) is set to 4, then q(K,0)=0 and q(K,1)=0 are set, and the transmitting device transmits q(K,0) and q(K,1).

[0793] If the number of time points used for data symbol group #(j=K) is set to 8, then q(K,0)=1 and q(K,1)=0 are set, and the transmitting device transmits q(K,0) and q(K,1).

[0794] If the number of time points used for data symbol group #(j=K) is set to 12, then q(K,0)=0 and q(K,1)=1 are set, and the transmitting device transmits q(K,0) and q(K,1).

[0795] If the number of time points used for data symbol group #(j=K) is set to 16, then q(K,0)=1 and q(K,1)=1 are set, and the transmitting device transmits q(K,0) and q(K,1).

[0796] For example, in the case of data symbol group #2 in Figure 46, time 5 to time 12 is used for transmission, meaning the number of time points is 8. Therefore, we set q(2,0)=1 and q(2,1)=0, and the transmitting device transmits q(2,0) and q(2,1).

[0797] Similarly, control information can be generated for data symbol group #1 and data symbol #3, and the transmitter in Figure 1 transmits q(1,0), q(1,1), q(2,0), q(2,1), and q(3,0), q(3,1).

[0798] The receiver in Figure 23 receives q(1,0), q(1,1), q(2,0), q(2,1), and q(3,0), q(3,1), and knows the frequency and time resources used by the data symbol groups. If the transmitter and receiver share the understanding that, for example, "data symbol group #1 is placed first in time, followed by data symbol group #2, data symbol group #3, data symbol group #4, data symbol group #5, ...", then knowing the time number used by each data symbol group allows them to determine the frequency and time resources used by each data symbol group. (The transmitter no longer needs to transmit information about the initial time of placement of each data symbol group, thereby improving data transmission efficiency).

[0799] <Example 10> Unlike Example 8, each data symbol group has, for example, 4 × B times (where B is a natural number greater than or equal to 1) (using times that are multiples of 4 (excluding 0)) (as in Example 9). However, the number of times used by each data symbol group is not limited to multiples of 4, but can be any multiple of D (where D is an integer greater than or equal to 2), excluding 0.

[0800] Therefore, area decomposition is performed as shown in Figure 47. In Figure 47, the vertical axis represents frequency and the horizontal axis represents time. And, as in Figure 46, we assume that there are carriers 1 to 16 and time points 1 to 16. Note that in Figure 47, each area is composed of 16 carriers in the carrier direction and 4 time points, totaling 16 × 4 = 64 symbols. (If generalized using C and D as explained above, each area would be composed of C carriers in the carrier direction and C × D symbols in the time direction, totaling D time points).

[0801] In Figure 47, the area 4700 consisting of time points 1 through 4 is named Area #0.

[0802] Area 4701, consisting of time zones 5 to 8, will be named Area #1.

[0803] Area 4702, which consists of time zones 9 to 12, will be named Area #2.

[0804] Area 4703, which consists of time zones 13:00 to 16:00, will be named Area #3.

[0805] At this time, the transmitting device in Figure 1 transmits control information to the receiving device in order to convey information about the frequency and time resources used by each data symbol group, as shown in the following example.

[0806] When data symbol group #1 in Figure 46 is decomposed into areas as shown in Figure 47, it transmits data (information) using area #0 (4700). Therefore, as data symbol group #1, "Using area #0 (4700)" The transmitting device in Figure 1 transmits this control information. At this time, the control information will include area information (area #0 (4700)).

[0807] Similarly, as data symbol group #2 in Figure 46, "Using Area #1 (4701) and Area #2 (4702)" The transmitting device in Figure 1 transmits this control information. At this time, the control information will include area information (Area #1 (4701), Area #2 (4702)).

[0808] As data symbol group #3 in Figure 46, "Using area #3 (4703)" The transmitting device in Figure 1 transmits this control information. At this time, the control information will include area information (area #3 (4703)).

[0809] Examples 4 through 10 describe the control information for time division. For example, when using Examples 4, 5, and 6, the control information for frequency division and the control information for time division can be constructed similarly.

[0810] On the other hand, if we consider the difference between <Example 7> and <Example 10>, the configuration of "control information regarding the use of time and frequency resources during frequency division and time and frequency resources during time division" is different. The transmitting device will transmit "control information regarding the use of the source" using the first preamble and / or the second preamble.

[0811] For example, in the frame configuration shown in Figure 5, the first preamble 201 and / or the second preamble 202 may contain control information regarding the use of time and frequency resources during frequency division, while the first preamble 501 and / or the second preamble 502 may contain control information regarding the use of time and frequency resources during time division.

[0812] Similarly, in the frame configurations of Figures 25, 28, and 32, the first preamble 201 and / or the second preamble 202 may contain control information regarding the use of time and frequency resources during frequency division, and the first preamble 501 and / or the second preamble 502 may contain control information regarding the use of time and frequency resources during time division.

[0813] Furthermore, in the frame configuration shown in Figure 36, the first preambles 201, 501, and / or the second preambles 202, 502 may contain control information regarding the use of time and frequency resources during frequency division, and the first preamble 3601, and / or the second preamble 3602 may contain control information regarding the use of time and frequency resources during time division.

[0814] In the above examples, the fifth, sixth, ninth, and tenth examples have the advantage of being able to transmit information about the time used and frequency resources with a small number of bits.

[0815] On the other hand, the fourth, seventh, and eighth examples have the advantage of allowing for more flexible allocation of time and frequency resources to the data symbol set.

[0816] As illustrated in the example above, when the transmitting device sends control information regarding the use of time and frequency resources during frequency division and control information regarding the use of time and frequency resources during time division, the receiving device can know the usage status of the time and frequency resources of the data symbol group and accurately demodulate and decode the data.

[0817] (Embodiment 6) In Embodiments 1 to 5, several examples of the frame configuration of the modulated signal transmitted by the transmitting device in Figure 1 were described. In this embodiment, a frame configuration different from the frame configurations described in Embodiments 1 to 5 will be described.

[0818] Figure 48 shows an example of the frame configuration of the modulated signal transmitted by the transmitter in Figure 1. In Figure 48, components that operate similarly to those in Figure 5 are given the same numbers, and the vertical axis represents frequency and the horizontal axis represents time. As with Embodiments 1 to 5, the data symbol group may be SISO (SIMO), MIMO, or MISO symbols.

[0819] In Figure 48, the difference from Figure 5 is that the first preamble 201 and the second preamble 202 from Figure 5 are absent. Furthermore, control information symbols (e.g., TMCC (Transmission Multiplexing Configuration Control)) are placed in the frequency direction in data symbol group #1 (401_1, 401_2) and data symbol group #2 (402). The control information symbols include, for example, symbols for frame synchronization, frequency synchronization, and time synchronization, as well as frequency and time resources used by the data symbol group described in Embodiment 5. This will include information such as symbols for notifying signals, information about the modulation scheme for generating data symbol sets, and information about error correction schemes for generating data symbol sets (information about the code, information about the code length, information about the coding rate, etc.).

[0820] Figure 49 shows an example configuration when control information symbols (e.g., TMCC (Transmission Multiplexing Configuration Control)) are placed in the frequency direction in data symbol group #1 (401_1, 401_2) and data symbol group #2 (402).

[0821] In Figure 49, the vertical axis represents frequency and the horizontal axis represents time. 4901, 4902, and 4903 are data symbol group #X (in the case of Figure 48, X will be 1 or 2), and 4904 and 4905 are control information symbols (for example, TMCC (Transmission Multiplexing Configuration Control)).

[0822] As shown in Figure 49, the control information symbols (4904, 4905) are placed on a specific carrier (subcarrier) (frequency). (Note that this specific carrier may or may not contain symbols other than the control information symbols).

[0823] For example, in Figure 49, let X=1. Then, as shown in Figure 49, the control information symbol will be placed on a specific carrier (subcarrier) (frequency) of data symbol group #1.

[0824] Similarly, in Figure 49, let X=2. Then, as shown in Figure 49, the control information symbol will be placed on a specific carrier (subcarrier) (frequency) of data symbol group #2.

[0825] Furthermore, when placing control information symbols in a frequency-time area where data symbols are arranged by frequency division as shown in Figure 48, for example, if carriers #1 to #100 exist, control information symbols may be placed on specific carriers such as carrier #5, carrier #25, carrier #40, carrier #55, carrier #70, and carrier #85, or control information symbols may be placed according to the arrangement of data symbols.

[0826] Next, we will explain the advantages of using the frame configuration shown in Figure 48.

[0827] In the frame configuration shown in Figure 5, the receiving device needs to obtain the first preamble 201 and the second preamble 202 in order to demodulate and decode data symbol group #1 and data symbol group #2 and obtain information. Therefore, the receiving device needs to obtain a modulated signal in the frequency band necessary to receive the first preamble 201 and the second preamble 202.

[0828] In this context, if there are terminals that only require data symbol group #2, it is desirable that the frame configuration allows for demodulation and decoding of data symbol group #2 using only the frequency band occupied by data symbol group #2, in order to enable flexible terminal design. The frame configuration in Figure 48 can achieve this.

[0829] When the frame is configured as shown in Figure 48, as shown in Figure 49, control information symbols (e.g., TMCC (Transmission Multiplexing Configuration Control)) are inserted in the frequency direction into data symbol group #2, so the receiving device will interpret data symbol group #2 as follows: By obtaining a modulated signal within the specified frequency band, data symbol group #2 can be demodulated and decoded. This allows for flexible terminal design.

[0830] Next, we will describe the case where the frame configuration of the modulated signal transmitted by the transmitting device in Figure 1 is as shown in Figure 50. In Figure 50, components that operate similarly to those in Figure 25 are given the same numbers, and the vertical axis represents frequency, while the horizontal axis represents time. As with Embodiments 1 to 5, the data symbol group may be SISO (SIMO), MIMO, or MISO symbols.

[0831] In Figure 50, the difference from Figure 25 is that the first preamble 201 and the second preamble 202 present in Figure 25 are absent. Furthermore, control information symbols (e.g., TMCC (Transmission Multiplexing Configuration Control)) are placed in the frequency direction in data symbol group #1 (2501), data symbol group #2 (2502), and data symbol group #4 (2503). Note that control information symbols include, for example, frame synchronization and frequency This includes symbols for numerical synchronization and time synchronization, symbols for notifying the frequency and time resources used by the data symbol group described in Embodiment 5, information about the modulation scheme for generating the data symbol group, and information about the error correction scheme for generating the data symbol group (such as information about the code, information about the code length, and information about the coding rate).

[0832] Figure 49 shows the arrangement of control information symbols (e.g., TMCC (Transmission Multiplexing Configuration Control)) in the frequency direction in data symbol group #1 (2501), data symbol group #2 (2502), and data symbol group #4 (2503). An example configuration is shown.

[0833] In Figure 49, the vertical axis represents frequency and the horizontal axis represents time. 4901, 4902, and 4903 are data symbol group #X (in the case of Figure 50, X will be 1, 2, or 4), and 4904 and 4905 are control information symbols (for example, TMCC (Transmission Multiplexing Configuration Control)).

[0834] As shown in Figure 49, the control information symbols (4904, 4905) are placed on a specific carrier (subcarrier) (frequency). (Note that this specific carrier may or may not contain symbols other than the control information symbols).

[0835] For example, in Figure 49, let X=1. Then, as shown in Figure 49, the control information symbol will be placed on a specific carrier (subcarrier) (frequency) of data symbol group #1.

[0836] Similarly, in Figure 49, let X=2. Then, as shown in Figure 49, the control information symbol will be placed on a specific carrier (subcarrier) (frequency) of data symbol group #2.

[0837] In Figure 49, let X = 4. Then, as shown in Figure 49, the control information symbol will be placed on a specific carrier (subcarrier) (frequency) of data symbol group #4.

[0838] Furthermore, when placing control information symbols in a frequency-time area where data symbols are arranged by frequency division as shown in Figure 50, for example, if carriers #1 to #100 exist, control information symbols may be placed on specific carriers such as carrier #5, carrier #25, carrier #40, carrier #55, carrier #70, and carrier #85, or control information symbols may be placed according to the arrangement of data symbols.

[0839] Next, we will explain the advantages of using the frame configuration shown in Figure 50.

[0840] In the frame configuration shown in Figure 25, the receiving device needs to obtain the first preamble 201 and the second preamble 202 in order to demodulate and decode data symbol group #1, data symbol group #2, and data symbol group #4 to obtain information. Therefore, the receiving device needs to obtain a modulated signal in the frequency band necessary to receive the first preamble 201 and the second preamble 202.

[0841] In this context, if there are terminals that only require data symbol group #2, it is desirable that the frame configuration allows for demodulation and decoding of data symbol group #2 using only the frequency band occupied by data symbol group #2, in order to enable flexible terminal design. The frame configuration in Figure 50 can achieve this.

[0842] When the frame is configured as shown in Figure 50, as shown in Figure 49, control information symbols (e.g., TMCC (Transmission Multiplexing Configuration Control)) are inserted in the frequency direction in data symbol group #2, so the receiving device will interpret data symbol group #2 as follows: By obtaining a modulated signal within the specified frequency band, data symbol group #2 can be demodulated and decoded. This allows for flexible terminal design.

[0843] Next, we will describe the case where the frame configuration of the modulated signal transmitted by the transmitting device in Figure 1 is as shown in Figure 51. In Figure 51, components that operate similarly to those in Figure 28 are given the same numbers, and the vertical axis represents frequency, while the horizontal axis represents time. As with Embodiments 1 to 5, the data symbol group may be SISO (SIMO), MIMO, or MISO symbols.

[0844] In Figure 51, the difference from Figure 28 is that the first preamble 201 and the second preamble 202 from Figure 28 are absent. Furthermore, control information symbols (e.g., TMCC (Transmission Multiplexing Configuration Control)) are placed in the frequency direction in data symbol group #1 (2701) and data symbol group #2 (2702). The information symbols include, for example, symbols for frame synchronization, frequency synchronization, and time synchronization; symbols for notifying the frequency and time resources used by the data symbol group described in Embodiment 5; information regarding the modulation scheme for generating the data symbol group; and information regarding the error correction scheme for generating the data symbol group (such as information regarding the code, code length, and coding rate).

[0845] Figure 49 shows an example configuration when control information symbols (e.g., TMCC (Transmission Multiplexing Configuration Control)) are placed in the frequency direction in data symbol group #1 (2701) and data symbol group #2 (2702).

[0846] In Figure 49, the vertical axis represents frequency and the horizontal axis represents time. 4901, 4902, and 4903 are data symbol group #X (in the case of Figure 51, X will be 1 or 2), and 4904 and 4905 are control information symbols (for example, TMCC (Transmission Multiplexing Configuration Control)).

[0847] As shown in Figure 49, the control information symbols (4904, 4905) are placed on a specific carrier (subcarrier) (frequency). (Note that this specific carrier may or may not contain symbols other than the control information symbols).

[0848] For example, in Figure 49, let X=1. Then, as shown in Figure 49, if we place a control information symbol on a specific carrier (subcarrier) (frequency) of data symbol group #1, That's what it comes down to.

[0849] Similarly, in Figure 49, let X=2. Then, as shown in Figure 49, the control information symbol will be placed on a specific carrier (subcarrier) (frequency) of data symbol group #2.

[0850] Furthermore, when placing control information symbols in a frequency-time area where data symbols are arranged by frequency division as shown in Figure 51, for example, if carriers #1 to #100 exist, control information symbols may be placed on specific carriers such as carrier #5, carrier #25, carrier #40, carrier #55, carrier #70, and carrier #85, or control information symbols may be placed according to the arrangement of data symbols.

[0851] Next, we will explain the advantages of using the frame configuration shown in Figure 51.

[0852] In the frame configuration shown in Figure 28, the receiving device needs to obtain the first preamble 201 and the second preamble 202 in order to demodulate and decode data symbol group #1 and data symbol group #2 and obtain information. Therefore, the receiving device needs to obtain a modulated signal in the frequency band necessary to receive the first preamble 201 and the second preamble 202.

[0853] In this context, if there are terminals that only require data symbol group #2, it is desirable that the frame configuration allows for demodulation and decoding of data symbol group #2 using only the frequency band occupied by data symbol group #2, in order to enable flexible terminal design. The frame configuration in Figure 51 can achieve this.

[0854] When the frame is configured as shown in Figure 51, as shown in Figure 49, control information symbols (e.g., TMCC (Transmission Multiplexing Configuration Control)) are inserted in the frequency direction in data symbol group #2, so the receiving device will interpret data symbol group #2 as follows: By obtaining a modulated signal within the specified frequency band, data symbol group #2 can be demodulated and decoded. This allows for flexible terminal design.

[0855] Next, we will describe the case where the frame configuration of the modulated signal transmitted by the transmitting device in Figure 1 is as shown in Figure 52. In Figure 52, components that operate in the same way as in Figure 32 are given the same numbers, and the vertical axis represents frequency and the horizontal axis represents time. As with Embodiments 1 to 5, the data symbol group may be SISO (SIMO), MIMO, or MISO symbols.

[0856] In Figure 52, the difference from Figure 32 is that the first preamble 201 and the second preamble 202 present in Figure 32 are absent. Furthermore, control information symbols (for example, TMCC (Transmission Multiplexing Configuration Control)) are placed in the frequency direction in data symbol groups #1 (3001), #2 (3002), #3 (3003), #4 (3004), #5 (3005), and #6 (3006). Note that control information symbols include, for example... This would include symbols for frame synchronization, frequency synchronization, and time synchronization; symbols for notifying the frequency and time resources used by the data symbol group described in Embodiment 5; information regarding the modulation scheme for generating the data symbol group; and information regarding the error correction scheme for generating the data symbol group (such as information regarding the code, code length, and coding rate).

[0857] However, data symbol group #1 (3001), data symbol group #2 (3002), It is not guaranteed that control information symbols will be placed in the frequency direction in all of the data symbol groups #3 (3003), #4 (3004), #5 (3005), and #6 (3006). This point will be explained using Figure 53.

[0858] Figure 53 shows an example of the arrangement of control information symbols from time t1 to time t3 in Figure 52. In the case of Figure 52, data symbol groups 5301, 5302, and 5303 will contain one of the following: data symbol group #1 (3001), data symbol group #2 (3002), data symbol group #3 (3003), data symbol group #4 (3004), data symbol group #5 (3005), and data symbol group #6 (3006).

[0859] In Figure 53, 5304 and 5305 are control information symbols, and control information symbols (e.g., TMCC (Transmission Multiplexing Configuration Control)) are arranged in the frequency direction. The control information symbol 5304 is placed on a specific carrier, as shown in Figure 53, and the control information symbol 5305 is placed on a specific carrier (subcarrier) (frequency), as shown in Figure 53 (this specific carrier may or may not contain symbols other than the control information symbols).

[0860] As shown in Figure 52, when placing control information symbols in a frequency-time area where data symbols are arranged by frequency division, for example, if carriers #1 to #100 exist, control information symbols may be placed on specific carriers such as carrier #5, carrier #25, carrier #40, carrier #55, carrier #70, and carrier #85, or control information symbols may be placed according to the arrangement of data symbols.

[0861] Next, we will explain the advantages of using the frame configuration shown in Figure 52.

[0862] In the frame configuration shown in Figure 32, the receiving device needs to obtain the first preamble 201 and the second preamble 202 in order to demodulate and decode data symbol group #1 (3001), data symbol group #2 (3002), data symbol group #3 (3003), data symbol group #4 (3004), data symbol group #5 (3005), and data symbol group #6 (3006) and obtain information. Therefore, the receiving device needs to obtain a modulated signal in the frequency band necessary to receive the first preamble 201 and the second preamble 202.

[0863] In this context, if there are terminals that only require data symbol group #2, it is desirable that the frame configuration allows for demodulation and decoding of data symbol group #2 using only the frequency band occupied by data symbol group #2, in order to enable flexible terminal design. The frame configuration in Figure 52 can achieve this.

[0864] When the frame is configured as shown in Figure 52, as shown in Figure 53, control information symbols (e.g., TMCC (Transmission Multiplexing Configuration Control)) are inserted in the frequency direction into the data symbol group, so the receiving device is around data symbol group #2. By obtaining a modulated signal within the frequency band, data symbol group #2 can be demodulated and decoded. Therefore, flexible terminal design becomes possible.

[0865] Next, we will describe the case where the frame configuration of the modulated signal transmitted by the transmitting device in Figure 1 is as shown in Figure 54. In Figure 54, components that operate similarly to those in Figure 36 are given the same numbers, and the vertical axis represents frequency, while the horizontal axis represents time. As with Embodiments 1 to 5, the data symbol group may be SISO (SIMO), MIMO, or MISO symbols.

[0866] In Figure 54, the difference from Figure 36 is that the first preamble 201 in Figure 36 and the second One point to note is that preamble 202, the first preamble 501, and the second preamble 502 are missing. Furthermore, control information symbols (e.g., TMCC (Transmission Multiplexing Configuration Control)) are placed in the frequency direction in data symbol groups #1 (3401), #2 (3402), #3 (3403), #4 (3404), #5 (3405), #6 (3406), #7 (3407), #8 (3408), #9 (3509), #10 (3510), #11 (3511), #12 (3512), and #13 (3513). Note that control information symbols include, for example, frame synchronization and frequency synchronization. This includes symbols for time synchronization, symbols for notifying the frequency and time resources used by the data symbol group described in Embodiment 5, information about the modulation scheme for generating the data symbol group, and information about the error correction scheme for generating the data symbol group (such as information about the code, information about the code length, and information about the coding rate).

[0867] However, it is not guaranteed that control information symbols will be placed in the frequency direction in all of the data symbol groups #1 (3401), #2 (3402), #3 (3403), #4 (3404), #5 (3405), #6 (3406), #7 (3407), #8 (3408), #9 (3509), #10 (3510), #11 (3511), #12 (3512), and #13 (3513). This point will be explained using Figure 53.

[0868] Figure 53 shows an example of the arrangement of control information symbols from time t1 to time t3 in Figure 54. In the case of Figure 54, data symbol groups 5301, 5302, and 5303 will contain one of the following: data symbol group #1 (3401), data symbol group #2 (3402), data symbol group #3 (3403), data symbol group #4 (3404), data symbol group #5 (3405), data symbol group #6 (3406), data symbol group #7 (3407), data symbol group #8 (3408), data symbol group #9 (3509), data symbol group #10 (3510), data symbol group #11 (3511), data symbol group #12 (3512), and data symbol group #13 (3513).

[0869] In Figure 53, 5304 and 5305 are control information symbols, and control information symbols (e.g., TMCC (Transmission Multiplexing Configuration Control)) are arranged in the frequency direction. The control information symbol 5304 is placed on a specific carrier, as shown in Figure 53, and the control information symbol 5305 is placed on a specific carrier (subcarrier) (frequency), as shown in Figure 53 (this specific carrier may or may not contain symbols other than the control information symbols).

[0870] As shown in Figure 54, when placing control information symbols in a frequency-time area where data symbols are arranged by frequency division, for example, if carriers #1 to #100 exist, control information symbols may be placed on specific carriers such as carrier #5, carrier #25, carrier #40, carrier #55, carrier #70, and carrier #85, or control information symbols may be placed according to the arrangement of data symbols.

[0871] Next, we will explain the advantages of using the frame configuration shown in Figure 54.

[0872] In the frame configuration shown in Figure 36, the receiving device receives data symbol group #1 (3401), data symbol group #2 (3402), data symbol group #3 (3403), and data symbol group To demodulate and decode data symbol #4 (3404), data symbol group #5 (3405), data symbol group #6 (3406), data symbol group #7 (3407), data symbol group #8 (3408), data symbol group #9 (3509), data symbol group #10 (3510), data symbol group #11 (3511), data symbol group #12 (3512), and data symbol group #13 (3513) and obtain information, it is necessary to obtain the first preamble 201, the second preamble 202, the first preamble 501, and the second preamble 502. Therefore, the receiving device needs to obtain a modulated signal in the frequency band necessary to receive the first preamble 201, the second preamble 202, the first preamble 501, and the second preamble 502.

[0873] In this context, if there are terminals that only require data symbol group #2, it is desirable that the frame configuration allows for demodulation and decoding of data symbol group #2 using only the frequency band occupied by data symbol group #2, in order to enable flexible terminal design. The frame configuration in Figure 54 can achieve this.

[0874] When the frame is configured as shown in Figure 54, as shown in Figure 53, control information symbols (e.g., TMCC (Transmission Multiplexing Configuration Control)) are inserted in the frequency direction into the data symbol group. Therefore, the receiving device will be around data symbol group #2. By obtaining a modulated signal within the frequency band, data symbol group #2 can be demodulated and decoded. Therefore, flexible terminal design becomes possible.

[0875] As shown in the examples above, when arranging data symbol groups using frequency division, arranging control information symbols in the frequency direction allows for flexible terminal design. Note that control information symbols related to data symbol groups arranged using time division will be included in the first and second preambles, as shown in Figures 48, 50, 51, 52, and 54.

[0876] Furthermore, the first and second preambles may contain control information related to the frequency-divided data symbol group, and the control information symbols (4904, 4905, 5304, 5305) shown in Figures 49 and 53 may contain control information related to the time-divided data symbol group.

[0877] (Embodiment 7) In Embodiments 1 to 6 (particularly Embodiment 1), the case of performing a phase change on a modulated signal was described. In this embodiment, in particular, a method for performing a phase change on a data symbol group that has been frequency-divided will be described.

[0878] In Embodiment 1, a phase shift was described for either or both of the baseband signals s1(t)(s1(i)) or s2(t)(s2(i)). A feature of this method is that, in the transmission frame, phase shifts are not applied to symbols other than those transmitting baseband signals s1(t) and s2(t), such as pilot symbols (reference symbols, unique words, postambles), first preambles, second preambles, and control information symbols.

[0879] Furthermore, regarding the method of phase shifting a data symbol group that has undergone frequency division, which involves "shifting the phase of either or both of the baseband signals s1(t)(s1(i)) or s2(t)(s2(i))", the following cases exist.

[0880] Case 1: The first case will be explained using Figures 55A and 55B. The vertical axis represents time, and the horizontal axis represents frequency. Figure 55A shows the frame configuration of the modulated signal z1(t)(z1(i)) in Embodiment 1, and Figure 55B shows the frame configuration of the modulated signal z2(t)(z2(i)) in Embodiment 1. The symbols of the modulated signals z1(t)(z1(i)) and z2(t)(z2(i)) at the same time and frequency (same carrier number) will be transmitted from different antennas.

[0881] In Figures 55A and 55B, the symbol labeled "P" is a pilot symbol, and as previously mentioned, no phase shift is applied to pilot symbols. In Figures 55A and 55B, symbols other than those labeled "P" are symbols for transmitting data (data symbols). Note that in Figures 55A and 55B, the frame is composed of data symbols and pilot symbols, but this is merely an example, and as previously mentioned, symbols such as control information symbols may also be included. In this case, for example, no phase shift is applied to control information symbols.

[0882] In Figure 55A, 5501 is the area where data symbols belonging to data symbol group #1 are placed, and 5502 is the area where data symbols belonging to data symbol group #2 are placed. Similarly, in Figure 55B, 5503 is the area where data symbols belonging to data symbol group #1 are placed, and 5504 is the area where data symbols belonging to data symbol group #2 are placed. Therefore, in the examples of Figures 55A and 55B, the data symbol groups are arranged using frequency division.

[0883] In the data symbol sets in Figures 55A and 55B, the phase change period is 7, and one of the seven types of phase changes, "phase change $0, phase change $1, phase change $2, phase change $3, phase change $4, phase change $5, phase change $6," is applied.

[0884] In the symbols of data symbol group #1 in region 5501 of Figure 55A, for example, "#0 There is a symbol labeled "$0". In this case, "#0" means that it is the "0th symbol" of data symbol group #1. And "$0" means that a phase change of "phase change $0" will be performed.

[0885] Additionally, there is a symbol labeled "#1 $1". In this case, "#1" means the "first symbol" of data symbol group #1. And "$1" means that a phase change of "phase change $1" is performed.

[0886] Therefore, there is a symbol written as "#X $Y" (where X is a non-negative integer and Y is an integer between 0 and 6). In this case, "#X" means that it is the "Xth symbol" of data symbol group #1. And "$Y" means that a phase change of "phase change $Y" is performed.

[0887] In the symbols of data symbol group #2 in region 5502 of Figure 55A, for example, "%0 There is a symbol labeled "$0". In this case, "%0" means that it is the "0th symbol" of data symbol group #2. And "$0" means that a phase change of "phase change $0" is performed.

[0888] Additionally, there is a symbol labeled "%1 $1". In this case, "%1" means the "first symbol" of data symbol group #2. And "$1" means that a phase change of "phase change $1" is performed.

[0889] Therefore, there is a symbol written as "%X $Y" (where X is a non-negative integer and Y is a non-negative integer between 0 and 6). In this case, "%X" is the "Xth cell" of data symbol group #2. It means "Nvol". And "$Y" means that a phase change of "phase change $Y" is performed.

[0890] In the symbols of data symbol group #1 in region 5503 of Figure 55B, for example, "#0 There is a symbol labeled "$0". In this case, "#0" means that it is the "0th symbol" of data symbol group #1. And "$0" means that a phase change of "phase change $0" will be performed.

[0891] Additionally, there is a symbol labeled "#1 $1". In this case, "#1" means the "first symbol" of data symbol group #1. And "$1" means that a phase change of "phase change $1" is performed.

[0892] Therefore, there is a symbol written as "#X $Y" (where X is a non-negative integer and Y is an integer between 0 and 6). In this case, "#X" means that it is the "Xth symbol" of data symbol group #1. And "$Y" means that a phase change of "phase change $Y" is performed.

[0893] In the symbols of data symbol group #2 in region 5504 of Figure 55B, for example, "%0 There is a symbol labeled "$0". In this case, "%0" means that it is the "0th symbol" of data symbol group #2. And "$0" means that a phase change of "phase change $0" is performed.

[0894] Additionally, there is a symbol labeled "%1 $1". In this case, "%1" means the "first symbol" of data symbol group #2. And "$1" means that a phase change of "phase change $1" is performed.

[0895] Therefore, there is a symbol written as "%X $Y" (where X is a non-negative integer and Y is an integer between 0 and 6). In this case, "%X" means that it is the "Xth symbol" of data symbol group #2. And "$Y" means that a phase change of "phase change $Y" is performed.

[0896] At this time, a phase change of period 7 will be performed on the data symbol of the modulated signal z1. For example, "a phase change of (2 × 0 × π) / 14 radians will be performed as phase change $0", "a phase change of (2 × 1 × π) / 14 radians will be performed as phase change $1", "a phase change of (2 × 2 × π) / 14 radians will be performed as phase change $2", "a phase change of (2 × 3 × π) / 14 radians will be performed as phase change $3", "a phase change of (2 × 4 × π) / 14 radians will be performed as phase change $4", "a phase change of (2 × 5 × π) / 14 radians will be performed as phase change $5", and "a phase change of (2 × 6 × π) / 14 radians will be performed as phase change $6" (however, the values ​​of the phase changes are not limited to these).

[0897] Then, a phase shift of period 7 is performed on the data symbol of the modulated signal z2. For example, "a phase shift of (2 × 0 × π) / 14 radians is performed as phase shift $0", "a phase shift of (2 × 1 × π) / 14 radians is performed as phase shift $1", "a phase shift of (2 × 2 × π) / 14 radians is performed as phase shift $2", "a phase shift of (2 × 3 × π) / 14 radians is performed as phase shift $3", "a phase shift of (2 × 4 × π) / 14 radians is performed as phase shift $4", "a phase shift of (2 × 5 × π) / 14 radians is performed as phase shift $5", and "a phase shift of (2 × 6 × π) / 14 radians is performed as phase shift $6" (however, the values ​​of the phase shifts are not limited to these). (As explained before, the modulated signal z1 undergoes phase shifting, while the modulated signal z2 does not.) It is also possible to do this. Alternatively, the modulated signal z1 may not undergo phase shifting, while the modulated signal z2 may undergo phase shifting.

[0898] The characteristic of the first case is that "a phase shift of period 7 is performed on data symbol group #1 and data symbol group #2 together." (In other words, regardless of the data symbol group to which they belong, a phase shift of period 7 is performed on all data symbols in the frame.)

[0899] Case 2: The second case will be explained using Figures 56A and 56B. The vertical axis represents time, and the horizontal axis represents frequency. Figure 56B shows the frame configuration of the modulated signal z1(t)(z1(i)) in Embodiment 1, and Figure 56B shows the frame configuration of the modulated signal z2(t)(z2(i)) in Embodiment 1. The symbols of the modulated signals z1(t)(z1(i)) and z2(t)(z2(i)) at the same time and frequency (same carrier number) will be transmitted from different antennas.

[0900] In Figures 56A and 56B, the symbol labeled "P" is a pilot symbol, and as previously mentioned, no phase shift is applied to pilot symbols. In Figures 56A and 56B, symbols other than those labeled "P" are symbols for transmitting data (data symbols). Note that in Figures 56A and 56B, the frame is composed of data symbols and pilot symbols, but this is merely an example, and as previously mentioned, symbols such as control information symbols may also be included. In this case, for example, no phase shift is applied to control information symbols.

[0901] In Figure 56A, 5501 is the area where data symbols belonging to data symbol group #1 are placed, and 5502 is the area where data symbols belonging to data symbol group #2 are placed. Similarly, in Figure 56B, 5503 is the area where data symbols belonging to data symbol group #1 are placed, and 5504 is the area where data symbols belonging to data symbol group #2 are placed. Therefore, in the example in Figure 56, the data symbol groups are arranged using frequency division.

[0902] In data symbol group #1 in Figures 56A and 56B, the phase change period is 7, and one of the seven types of phase changes, "phase change $0, phase change $1, phase change $2, phase change $3, phase change $4, phase change $5, phase change $6," is applied. Then, in data symbol group #2 in Figures 56A and 56B, the phase change period is 5, and one of the five types of phase changes, "phase change ♭0, phase change ♭1, phase change ♭2, phase change ♭3, phase change ♭4," is applied.

[0903] In the symbols of data symbol group #1 in region 5501 of Figure 56A, for example, "#0 There is a symbol labeled "$0". In this case, "#0" means that it is the "0th symbol" of data symbol group #1. And "$0" means that a phase change of "phase change $0" will be performed.

[0904] Additionally, there is a symbol labeled "#1 $1". In this case, "#1" means the "first symbol" of data symbol group #1. And "$1" means that a phase change of "phase change $1" is performed.

[0905] Therefore, there is a symbol written as "#X $Y" (where X is a non-negative integer and Y is an integer between 0 and 6). In this case, "#X" means that it is the "Xth symbol" of data symbol group #1. And "$Y" means that a phase change of "phase change $Y" is performed.

[0906] In the symbols of data symbol group #2 in region 5502 of Figure 56A, for example, "%0 There is a symbol labeled "♭0". In this case, "%0" means that it is the "0th symbol" of data symbol group #2. And "♭0" means that a phase change of "Phase Change ♭0" is performed.

[0907] Additionally, there is a symbol labeled "%1 ♭1". In this case, "%1" means the "first symbol" of data symbol group #2. And "♭1" means that a phase change of "phase change ♭1" is performed.

[0908] Therefore, there is a symbol that is written as "%X ♭Y" (where X is a non-negative integer and Y is an integer between 0 and 4). In this case, "%X" means that it is the "Xth symbol" of data symbol group #2. And "♭Y" means that a phase change of "phase change ♭Y" is performed.

[0909] In the symbols of data symbol group #1 in region 5503 of Figure 56B, for example, "#0 There is a symbol labeled "$0". In this case, "#0" means that it is the "0th symbol" of data symbol group #1. And "$0" means that a phase change of "phase change $0" will be performed.

[0910] Additionally, there is a symbol labeled "#1 $1". In this case, "#1" means the "first symbol" of data symbol group #1. And "$1" means that a phase change of "phase change $1" is performed.

[0911] Therefore, there is a symbol written as "#X $Y" (where X is a non-negative integer and Y is an integer between 0 and 6). In this case, "#X" means that it is the "Xth symbol" of data symbol group #1. And "$Y" means that a phase change of "phase change $Y" is performed.

[0912] In the symbols of data symbol group #2 in region 5504 of Figure 56B, for example, "%0 There is a symbol labeled "♭0". In this case, "%0" means that it is the "0th symbol" of data symbol group #2. And "♭0" means that a phase change of "Phase Change ♭0" is performed.

[0913] Additionally, there is a symbol labeled "%1 ♭1". In this case, "%1" means the "first symbol" of data symbol group #2. And "♭1" means that a phase change of "phase change ♭1" is performed.

[0914] Therefore, there is a symbol that is written as "%X ♭Y" (where X is a non-negative integer and Y is an integer between 0 and 4). In this case, "%X" means that it is the "Xth symbol" of data symbol group #2. And "♭Y" means that a phase change of "phase change ♭Y" is performed.

[0915] At this time, a phase change of period 7 will be performed in data symbol group #1 of the modulated signal z1. For example, "a phase change of (2×0×π) / 14 radians will be performed as phase change $0", "a phase change of (2×1×π) / 14 radians will be performed as phase change $1", "a phase change of (2×2×π) / 14 radians will be performed as phase change $2", "a phase change of (2×3×π) / 14 radians will be performed as phase change $3", "a phase change of (2×4×π) / 14 radians will be performed as phase change $4", "a phase change of (2×5×π) / 14 radians will be performed as phase change $5", and "a phase change of (2×6×π) / 14 radians will be performed as phase change $6". The change will be made (however, the phase change values ​​are not limited to these).

[0916] Then, in the data symbol group #1 of the modulated signal z2, a phase change with period 7 will be performed. For example, "a phase change of (2 × 0 × π) / 14 radians will be performed as phase change $0", "a phase change of (2 × 1 × π) / 14 radians will be performed as phase change $1", "a phase change of (2 × 2 × π) / 14 radians will be performed as phase change $2", "a phase change of (2 × 3 × π) / 14 radians will be performed as phase change $3", "a phase change of (2 × 4 × π) / 14 radians will be performed as phase change $4", "a phase change of (2 × 5 × π) / 14 radians will be performed as phase change $5", and "a phase change of (2 × 6 × π) / 14 radians will be performed as phase change $6" (however, the values ​​of the phase changes are not limited to these). (As explained previously, it is also possible to perform a phase shift on data symbol group #1 of modulated signal z1 and not on data symbol group #1 of modulated signal z2. Alternatively, it is also possible to not perform a phase shift on data symbol group #1 of modulated signal z1 and to perform a phase shift on data symbol group #1 of modulated signal z2.)

[0917] Then, in the data symbol group #2 of the modulated signal z1, a phase change with period 5 will be performed. For example, "a phase change of (2 × 0 × π) / 10 radians will be performed as phase change ♭0", "a phase change of (2 × 1 × π) / 10 radians will be performed as phase change ♭1", "a phase change of (2 × 2 × π) / 10 radians will be performed as phase change ♭2", "a phase change of (2 × 3 × π) / 10 radians will be performed as phase change ♭3", and "a phase change of (2 × 4 × π) / 10 radians will be performed as phase change ♭4" (however, the values ​​of the phase changes are not limited to these).

[0918] Then, in the data symbol group #2 of the modulated signal z2, a phase change with period 5 will be performed. For example, "a phase change of -(2×0×π) / 10 radians will be performed as phase change ♭0", "a phase change of -(2×1×π) / 10 radians will be performed as phase change ♭1", "a phase change of -(2×2×π) / 10 radians will be performed as phase change ♭2", "a phase change of -(2×3×π) / 10 radians will be performed as phase change ♭3", and "a phase change of -(2×4×π) / 10 radians will be performed as phase change ♭4" (however, the values ​​of the phase changes are not limited to these). (As previously explained, it is also possible to perform a phase shift on data symbol group #2 of modulated signal z1, but not on data symbol group #2 of modulated signal z2. Alternatively, it is also possible to not perform a phase shift on data symbol group #2 of modulated signal z1, but to perform a phase shift on data symbol group #2 of modulated signal z2.)

[0919] The characteristic of the second case is that "a phase shift with period 7 is performed in data symbol group #1, and a phase shift with period 5 is performed in data symbol group #2." (In other words, each data symbol group performs its own unique phase shift. However, the same phase shift may be applied to different data symbols.)

[0920] Third case: Figure 57 shows the relationship between the transmitting station and the terminal in the third case. Terminal #3 (5703) is capable of receiving modulated signal #1 transmitted by transmitting station #1 (5701) and modulated signal #2 transmitted by transmitting station #2 (5702). For example, assume that the same data is transmitted in modulated signal #1 and modulated signal #2 in frequency band A. That is, if a baseband signal s1(t,f) is mapped to a data sequence using a certain modulation scheme (where t is time and f is frequency), then both transmitting station #1 and transmitting station #2 transmit modulated signals based on s1(t,f).

[0921] Therefore, terminal #3 (5703) receives both the modulated signal transmitted by transmitting station #1 and the modulated signal transmitted by transmitting station #2 in frequency band A, and demodulates and decodes the data.

[0922] Figure 58 shows an example of the configuration of transmitting station #1 and transmitting station #2, and considers the case where both transmitting station #1 and transmitting station #2 transmit modulated signals based on s1(t,f), as explained earlier, in frequency band A.

[0923] The error correction coding unit 5802 receives information 5801 and a signal 5813 regarding the transmission method as inputs, performs error correction coding based on the information regarding the error correction coding method contained in the signal 5813 regarding the transmission method, and outputs data 5803.

[0924] The mapping unit 5804 receives data 5803 and a signal 5813 relating to the transmission method as inputs, performs mapping based on the modulation scheme information contained in the signal 5813 relating to the transmission method, and outputs a baseband signal 5805(s1(t,f)). (Note that data interleaving (reordering of data) may be performed between the error correction coding unit 5802 and the mapping unit 5804.)

[0925] The control information symbol generation unit 5807 receives control information 5806 and transmission method information 5813 as inputs, generates a control information symbol based on the transmission method information contained in the transmission method signal 5813, and outputs a baseband signal 5808 of the control information symbol.

[0926] The pilot symbol generation unit 5809 receives a signal 5813 regarding the transmission method as input, generates a pilot symbol based on this, and outputs a baseband signal 5810 of the pilot symbol.

[0927] The transmission method instruction unit 5812 takes the transmission method instruction information 5811 as input and generates and outputs a signal 5813 regarding the transmission method.

[0928] The phase shifting unit 5814 receives the baseband signal 5805(s1(t,f)), the baseband signal 5808 for the control information symbol, the baseband signal 5810 for the pilot symbol, and the signal 5813 regarding the transmission method as inputs. Based on the frame configuration information and phase shifting information contained in the signal 5813 regarding the transmission method, it performs a phase shift and outputs the baseband signal 5815 based on the frame configuration. Further details will be explained later using Figures 59 and 60.

[0929] The wireless unit 5816 receives a baseband signal 5815 based on the frame configuration and a signal 5813 regarding the transmission method as inputs. Based on the signal 5813 regarding the transmission method, it performs processing such as interleaving, inverse Fourier transform, and frequency conversion to generate and output a transmission signal 5817, which is then output as radio waves from the antenna 5818.

[0930] Figure 59 shows an example of the frame configuration of a modulated signal (transmitted signal) transmitted by a transmitting station. In Figure 59, the vertical axis represents time and the horizontal axis represents frequency. In Figure 59, the symbol labeled "P" is a pilot symbol, and a characteristic of the third case is that the pilot symbol is phase-shifted. The symbol labeled "C" is a control information symbol, and a characteristic of the third case is that the control information symbol is phase-shifted. Figure 59 is an example of when the control information symbols are arranged along the time axis.

[0931] In the frame shown in Figure 59, the phase change period is 7, and one of the following seven types of phase changes is performed: "phase change $0, phase change $1, phase change $2, phase change $3, phase change $4, phase change $5, phase change $6".

[0932] In Figure 59, within the data symbol group #1 in region 5901, there is a symbol labeled, for example, "#0 $1". In this case, "#0" means that it is the "0th symbol" of data symbol group #1. And "$1" means that a phase change of "phase change $1" is performed.

[0933] Additionally, there is a symbol labeled "#1 $2". In this case, "#1" means the "first symbol" of data symbol group #1. And "$2" means that a phase change of "phase change $2" is performed.

[0934] Therefore, there is a symbol written as "#X $Y" (where X is a non-negative integer and Y is an integer between 0 and 6). In this case, "#X" means that it is the "Xth symbol" of data symbol group #1. And "$Y" means that a phase change of "phase change $Y" is performed.

[0935] In Figure 59, within the data symbol group #2 in region 5902, there is a symbol that reads, for example, "%0 $3". In this case, "%0" means that it is the "0th symbol" of data symbol group #2. And "$3" means that a phase change of "phase change $3" is performed.

[0936] Additionally, there is a symbol labeled "%1 $4". In this case, "%1" means the "first symbol" of data symbol group #2. And "$4" means that a phase change of "phase change $4" is performed.

[0937] Therefore, there is a symbol written as "%X $Y" (where X is a non-negative integer and Y is an integer between 0 and 6). In this case, "%X" means that it is the "Xth symbol" of data symbol group #2. And "$Y" means that a phase change of "phase change $Y" is performed.

[0938] Furthermore, in Figure 59, there is a symbol labeled, for example, "C $0". In this case, "C" means that it is a control information symbol, and "$0" means that a phase change will be performed, as indicated by "Phase Change $0".

[0939] Therefore, there is a symbol that says "C $Y" (where Y is an integer between 0 and 6). In this case, "C" means that it is a control information symbol, and "$Y" means that a phase change of "phase change $Y" is performed.

[0940] Furthermore, in Figure 59, there is a symbol labeled, for example, "P $0". In this case, "P" means that it is a pilot symbol, and "$0" means that a phase change of "Phase Change $0" is performed.

[0941] Therefore, there is a symbol labeled "P $Y" (where Y is an integer between 0 and 6). In this case, "P" means that it is a pilot symbol, and "$Y" means that a phase change of "phase change $Y" is performed.

[0942] At this time, a phase change of period 7 will be performed on the data symbol of the modulated signal. For example, "a phase change of (2 × 0 × π) / 7 radians will be performed as pha...

Claims

1. A transmission method for transmitting multiple data symbols using multiple frame configurations, Multiple frame configurations define an assignment method that assigns each of the multiple subcarriers obtained by dividing a predetermined frequency band and the entire predetermined frequency band using Orthogonal Frequency-DivisionMultiplexing (OFDM) to each of the multiple data symbol groups. Select one of several frame configurations, place a preamble symbol or pilot symbol containing information about the selected frame configuration between two data symbol groups assigned to a predetermined frequency band, and transmit. The information regarding the frame configuration indicates the selected frame configuration. In a frame configuration where multiple data symbol groups are assigned to multiple subcarriers obtained by dividing an entire predetermined frequency band, the number of subcarriers used by each data symbol group can be varied for each data symbol group. A control information symbol is assigned to a specific subcarrier in the frequency direction, and the control information symbol is associated with one of a plurality of data symbol groups assigned to the plurality of subcarriers, and indicates the initial position and number of carriers used by the associated data symbol group. Sending method.

2. The control information symbols associated with the aforementioned data symbol group indicate the initial position and time number of the time used by the data symbol group. The transmission method according to claim 1.

3. A transmitting device that transmits multiple data symbols using multiple frame configurations, Multiple frame configurations define an assignment method that assigns each of the multiple subcarriers obtained by dividing a predetermined frequency band and the entire predetermined frequency band using Orthogonal Frequency-DivisionMultiplexing (OFDM) to each of the multiple data symbol groups. A circuit that selects one of several frame configurations, The system includes a transmitting unit that places a preamble symbol or pilot symbol containing information about the selected frame configuration between two data symbol groups assigned to a predetermined frequency band and transmits it, In a frame configuration where multiple data symbol groups are assigned to multiple subcarriers obtained by dividing an entire predetermined frequency band, the number of subcarriers used by each data symbol group can be varied for each data symbol group. A control information symbol is assigned to a specific subcarrier in the frequency direction, and the control information symbol is associated with one of a plurality of data symbol groups assigned to the plurality of subcarriers, and indicates the initial position and number of carriers used by the associated data symbol group. Transmitter.

4. The control information symbols associated with the aforementioned data symbol group indicate the initial position and time number of the time used by the data symbol group. The transmitting device according to claim 3.

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