JP2005072882A - Diversity communication apparatus and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diversity communication apparatus having more superiority as compared to STC transmission in the scalability of a transmission rate. <P>SOLUTION: On a transmission side, respective transmission signals of N systems are spread by spreading codes different for the respective systems and the signals of the N systems after being spread are transmitted from N transmission antennas for the respective systems. On a reception side, the signals for which the signals of the N systems are spatially multiplexed are received by M reception antennas, the reception signals of the respective reception antennas are despread by N kinds of despreading codes and M pieces of the signals of N systems are generated. Then, M pieces of the signals are diversity-composited for the respective systems and the reception signals of N systems corresponding to the transmission signals of N systems are obtained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a diversity communication apparatus and method using MIMO (multi-input multi-output) transmission technology.

  A MIMO transmission technique in which the same or different signals are transmitted and received in the same frequency band by a plurality of transmission antennas and reception antennas, respectively, is known. There is an STC (space-time coding) transmission method as a diversity method in this MIMO transmission technology (see, for example, Non-Patent Document 1).

  FIGS. 9 and 10 are block diagrams showing configurations of a transmission apparatus and a reception apparatus when conventional STC transmission is performed using 2 × 2 MIMO (number of transmission antennas: 2, number of reception antennas: 2) channels, respectively. is there. 9 and 10 also show signal spectra at each point.

  9 and 10, when STC transmission is performed for two consecutive symbols T1 and T2 having a symbol interval Δt, the transmission device and the reception device operate as follows.

On the transmission side, the STC encoder 901 encodes the two symbols T1 and T2 as shown in FIG. Here, “ ^* ” in FIG. 9 represents a complex conjugate. The encoded symbols T1 and T2 ^* are transmitted in the same frequency band through the transmission antenna 902-1, and the symbols T2 and -T1 ^* are transmitted through the transmission antenna 902-2. At this time, the transmission bandwidth between the transmitting and receiving antennas is 1 / Δt.

On the receiving side, symbols T1 and T2, T2 ^* and -T1 ^* are spatially multiplexed on the MIMO channel, received by receiving antenna 911-1 as receiving symbols R11 and R12, and receiving antenna 911-2 as receiving symbols R21 and R22. Received by. The STC decoder 912 decodes T1 and T2 from R11, R12, R21, and R22 using the propagation path estimated value between each transmitting antenna and each receiving antenna estimated by the propagation path estimator 913. In the process of decoding T1 and T2, the STC decoder 912 separates T1 and T2 spatially multiplexed in R11, R12, R21, and R22, and diversity-combines each of T1 and T2.
SM Alamouti, “A Simple Transmit Diversity Technique for Wireless Communications”, IEEE JSAC, Vol. 16, No. 8, Oct. 1998.

  There is a desire to change the transmission capacity according to the propagation path condition without changing the air interface with a constant transmission bandwidth. However, when the baseband speed or the spatial multiplexing number of the desired signal is changed in order to change the transmission capacity, the STC transmission requires a different STC encoder for each baseband speed or each spatial multiplexing number. . That is, the above-mentioned STC transmission has a problem that there is a restriction on scalability of transmission speed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a diversity communication apparatus and method that are superior to STC transmission in terms of scalability in transmission speed.

  A first invention for solving the above-described problems and achieving the object is to generate a total of N different spreading codes for each of the transmission systems of N (N is an integer of 2 or more) transmission signals different from each other. Spreading code generating means, a total of N spreading means for performing spreading processing on the transmission signal using the spreading code generated by the spreading code generating means for each system, and the spreading means for each system A transmission apparatus comprising a total of N transmission antennas for transmitting the obtained signals in the same frequency band, and a total of M (M is the M for receiving N signals transmitted from the N transmission antennas) An integer greater than or equal to 2) receiving antennas, a total of N despreading code generating means for generating a despreading code corresponding to the spreading code generated by each spreading code generating means, and received by each receiving antenna For signal A despreading process is performed using the despreading code generated by each of the despreading code generating means, and M × N despreading means for obtaining M N systems of signals, and the M pieces for each system. A diversity apparatus comprising: a total of N diversity combining means for selecting or combining the signals obtained by the despreading means and obtaining N received signals corresponding to the N transmitted signals; It is a communication device.

  Further, the second aspect of the present invention provides a total of N spreading code generating means for generating different spreading codes for each of the systems for the same N (N is an integer of 2 or more) transmission signals, and for each of the systems. A total of N spreading means for performing spreading processing on the transmission signal using the spreading code generated by the spreading code generating means, and the signal obtained by the spreading means for each system is transmitted in the same frequency band A total of N transmitting antennas, a total of M (M is an integer of 2 or more) receiving antennas that respectively receive N signals transmitted from the N transmitting antennas, A total of N despread code generating means for generating despread codes corresponding to the spread codes generated by the respective spread code generating means, and the respective despread code generating means for the signals received by the respective receiving antennas Caused by A despreading process is performed using a despreading code, and a total of M × N despreading means for obtaining M N-system signals and signals obtained by the M × N despreading means are selected or combined. And a diversity communication apparatus having a total of one diversity combining means for obtaining a reception signal corresponding to the transmission signal.

  Further, the third aspect of the invention provides a total of N spreading code generating means for generating different spreading codes for each system for N (N is an integer of 2 or more) different transmission signals, and for each of the systems, A total of N serial / parallel conversion means for converting the serial transmission signals into parallel transmission signals of K (K is an integer of 1 or more) series, and the spreading code generation means for each of the systems and for each of the series The transmission signal is subjected to spreading processing in the frequency direction of spreading factor SF (SF is an integer of 2 or more) using the spreading code generated by the above, and a total of N × K spreading means for obtaining SF sequence signals, For each system, a total of N inverse fast Fourier transform means for performing the inverse fast Fourier transform by arranging the signal of the K-sequence SF sequence obtained by the K spreading means on each subcarrier, and for each system , The signal obtained by the inverse fast Fourier transform means. A total of N transmission antennas that transmit N signals transmitted from the N transmission antennas, where M is an integer of 2 or more. ) A total of M fast Fourier transform means for performing fast Fourier transform on the signals received by each of the receive antennas and obtaining a K-sequence SF sequence signal, and generating each of the spreading codes A total of N despreading code generating means for generating a despreading code corresponding to the spreading code generated by the means, and the respective inverse SFs for the SF sequence signals obtained by the respective fast Fourier transforming means. A total of M × N × K despreading units that perform despreading processing in the frequency direction using the despreading code generated by the spreading code generating unit to obtain M N systems of K-sequence signals; And said A total of N × K diversity combining means for selecting or combining the signals obtained by the M despreading means for each column and obtaining N systems of K-sequence signals, and the K signals for each system A total of N parallel-serial conversion means for converting the K-sequence signal obtained by the diversity combining means into a serial signal and obtaining N received signals corresponding to the N transmitted signals. And a diversity communication device.

  In addition, the fourth invention provides a total of N spreading code generating means for generating different spreading codes for each system for transmission signals of the same N (N is an integer of 2 or more) systems, and for each system A total of N serial-to-parallel conversion means for converting the serial transmission signals into parallel transmission signals of K (K is an integer of 1 or more) series, and the spread code generation for each system and each series A total of N × K spreading means for performing spreading processing in the frequency direction of spreading factor SF (SF is an integer of 2 or more) using the spreading code generated by the means to obtain SF sequence signals; For each of the systems, a total of N inverse fast Fourier transform means for performing the inverse fast Fourier transform by arranging the signal of the K-sequence SF sequence obtained by the K spreading means on each subcarrier, and for each of the systems And the signal obtained by the inverse fast Fourier transform means. A total of N transmission antennas that transmit N signals transmitted from the N transmission antennas, where M is an integer of 2 or more. ) A total of M fast Fourier transform means for performing fast Fourier transform on the signals received by each of the receive antennas and obtaining a K-sequence SF sequence signal, and generating each of the spreading codes A total of N despreading code generating means for generating a despreading code corresponding to the spreading code generated by the means, and the respective inverse SFs for the SF sequence signals obtained by the respective fast Fourier transforming means. A total of M × N × K despreading units that perform despreading processing in the frequency direction using the despreading code generated by the spreading code generating unit to obtain M N-system K-sequence signals; And M × N A total of K diversity combining means for selecting or combining the signals obtained by the despreading means to obtain K series signals, and the K series signals obtained by the K diversity combining means in series. A diversity communication device comprising: a receiving device including a total of one parallel-serial conversion unit that converts the signal into a received signal corresponding to the transmission signal.

  Further, the fifth invention provides a total of N spreading code generating means for generating different spreading codes for each system for transmission signals of N (N is an integer of 2 or more) systems different from each other, and for each system, A total of N serial / parallel conversion means for converting the serial transmission signals into parallel transmission signals of K (K is an integer of 1 or more) series, and the spreading code generation means for each of the systems and for each of the series The transmission signal is subjected to spreading processing in the time direction with a spreading factor SF (SF is an integer of 2 or more) using the spreading code generated by the above, and a total of N × K spreading means each for obtaining one column of signals, For each system, a total of N inverse fast Fourier transform means for performing the inverse fast Fourier transform by arranging the K-sequence signal obtained by the K spreading means on each subcarrier and performing the inverse fast Fourier transform, and the inverse signal for each system. The signal obtained by the fast Fourier transform means A total of N transmitting antennas for transmission in several bands, and a total of M (M is an integer of 2 or more) receiving N signals transmitted from the N transmitting antennas. Receiving antennas, a total of M fast Fourier transform units that perform fast Fourier transform on signals received by the respective receiving antennas to obtain K-sequence signals, and spreading codes generated by the respective spreading code generating units A total of N despreading code generating means for generating despreading codes corresponding to, and the despreading generated by each of the despreading code generating means for the signal of each series obtained by each of the fast Fourier transform means A total of M × N × K despreading means for performing despreading processing in the time direction using a code to obtain M N systems of K-sequence signals, and for each of the systems and for each of the sequences, M despreading means A total of N × K diversity combining means for selecting or combining the obtained signals to obtain N series of K series signals, and for each system, the K series of K series obtained by the diversity combining means. A diversity communication device comprising: a receiving device including a total of N parallel-serial conversion units that convert a signal into a serial signal and obtain N received signals corresponding to the N transmitted signals.

  Further, the sixth invention provides a total of N spreading code generating means for generating different spreading codes for each system for transmission signals of the same N (N is an integer of 2 or more) systems, and for each system A total of N serial-to-parallel conversion means for converting the serial transmission signals into parallel transmission signals of K (K is an integer of 1 or more) series, and the spread code generation for each system and each series A total of N × K spreading means for performing spreading processing of the spreading factor SF (SF is an integer of 2 or more) in the time direction using the spreading code generated by the means to obtain a signal in one column; For each of the systems, a total of N inverse fast Fourier transform means for performing the inverse fast Fourier transform by arranging the K-sequence signal obtained by the K spreading means on each subcarrier and performing the inverse fast Fourier transform, The signal obtained by the inverse fast Fourier transform means A total of N transmitting antennas for transmission in several bands, and a total of M (M is an integer of 2 or more) receiving N signals transmitted from the N transmitting antennas. Receiving antennas, a total of M fast Fourier transform units that perform fast Fourier transform on signals received by the respective receiving antennas to obtain K-sequence signals, and spreading codes generated by the respective spreading code generating units A total of N despreading code generating means for generating despreading codes corresponding to, and the despreading generated by each of the despreading code generating means for the signal of each series obtained by each of the fast Fourier transform means A total of M × N × K despreading means for performing despreading processing in the time direction using codes and obtaining M N systems of K-sequence signals, and the M × N despreading units for each sequence Credibility gained by means of diffusion A total of K diversity combining means for selecting or combining signals to obtain K-sequence signals, and converting the K-sequence signals obtained by the K diversity combining means into serial signals, corresponding to the transmission signals A diversity communication device having a receiving device including a total of one parallel-serial conversion means for obtaining a received signal.

  Further, according to a seventh aspect of the invention, on the transmission side, a spreading code generating step for generating different spreading codes for each of the systems with respect to transmission signals of N (N is an integer of 2 or more) systems different from each other; A spreading step for performing spreading processing on the transmission signal using the spreading code generated in the spreading code generating step, and N signals obtained in the spreading step in the same frequency band for a total of N signals Transmitting from the transmitting antennas, and at the receiving side, N signals transmitted from the N transmitting antennas are respectively transmitted to a total of M (M is an integer of 2 or more) receiving antennas. A receiving step for receiving, a despreading code generating step for generating N types of despreading codes corresponding to the spreading codes generated in the spreading code generating step, and reception by each receiving antenna. The despreading process is performed on the received signal using the N types of despreading codes generated in the despreading code generating step to obtain M N signals, and the despreading step is performed for each system. A diversity communication method comprising: a diversity combining step of selecting or combining M signals obtained in the spreading step and obtaining N received signals corresponding to the N transmitted signals.

  Further, according to an eighth aspect of the present invention, on the transmission side, a spreading code generation step for generating different spreading codes for each of the systems with respect to transmission signals of the same N (N is an integer of 2 or more) systems, In addition, a spreading step for performing spreading processing on the transmission signal using the spreading code generated in the spreading code generation step, and N signals obtained in the spreading step for each channel in the same frequency band A transmission step of transmitting from the transmission antennas, and at the reception side, a total of M (M is an integer of 2 or more) total of N signals transmitted from the N transmission antennas. Received by the receiving antennas, a despreading code generating step for generating N types of despreading codes corresponding to the spreading codes generated in the spreading code generating step, Obtained by performing the despreading process using the N types of despread codes generated in the despread code generation step to obtain M N signals, and the despread step. And diversity combining step of selecting or combining M × N signals and obtaining a reception signal corresponding to the transmission signal.

  Further, the ninth invention is a transmission code generation step for generating different spreading codes for each system for transmission signals of N (N is an integer of 2 or more) systems different from each other on the transmission side, and for each system, A serial / parallel conversion step for converting the serial transmission signal into a parallel transmission signal of K (K is an integer of 1 or more) series, and spreading generated in the spreading code generation step for each system and for each series The transmission signal is subjected to spreading processing in the frequency direction with a spreading factor SF (SF is an integer of 2 or more) using a code, and a spreading step for obtaining SF sequence signals is obtained in the spreading step for each system. An inverse fast Fourier transform step for performing an inverse fast Fourier transform by placing a signal of a K-sequence SF sequence on each subcarrier and the N systems of signals obtained by the inverse fast Fourier transform step in the same frequency band A transmission step of transmitting from a total of N transmission antennas for each series, and at the receiving side, a total of M signals (M is an integer of 2 or more) of N signals transmitted from the N transmission antennas. A receiving step for receiving by each of the receiving antennas, a fast Fourier transform step for performing a fast Fourier transform on the signal received by each receiving antenna, and obtaining a signal of a K-sequence SF sequence for each receiving antenna; The despread code generation step for generating N types of despread codes corresponding to the spread codes generated in the spread code generation step, and the SF sequences of the respective sequences obtained for each of the receiving antennas in the fast Fourier transform step. The signal is subjected to despreading processing in the frequency direction using each despread code generated in the despread code generation step to obtain M N-system K-sequence signals. A diversity combining step for selecting or combining the M signals obtained in the despreading step for each system and for each sequence to obtain N systems of K-sequence signals; And a parallel-serial conversion step of converting the K-sequence signal obtained in the diversity combining step into a serial signal to obtain N-system received signals corresponding to the N-system transmission signals. is there.

  A tenth aspect of the present invention is a transmission code generation step for generating different spreading codes for each system for transmission signals of the same N (N is an integer of 2 or more) systems on the transmission side; The serial transmission signal is converted into a parallel transmission signal of K (K is an integer of 1 or more) series, and the spread code generation step for each system and for each series. The transmission signal is subjected to spreading processing in the frequency direction with a spreading factor SF (SF is an integer of 2 or more) using a spreading code, and a spreading step for obtaining SF sequence signals is obtained in the spreading step for each system. An inverse fast Fourier transform step for performing an inverse fast Fourier transform and an N-system signal obtained by the inverse fast Fourier transform step are placed in the same frequency band. A transmission step of transmitting from a total of N transmission antennas for each system. On the receiving side, a total of M signals (M is an integer equal to or greater than 2) N signals transmitted from the N transmission antennas. A receiving step for receiving by each of the receiving antennas, a fast Fourier transform step for performing a fast Fourier transform on the signal received by each receiving antenna, and obtaining a signal of a K-sequence SF sequence for each receiving antenna; The despread code generation step for generating N types of despread codes corresponding to the spread codes generated in the spread code generation step, and the SF sequences of the respective sequences obtained for each of the receiving antennas in the fast Fourier transform step. The signal is despread in the frequency direction using each of the despread codes generated in the despread code generation step to obtain M N-system K-sequence signals. A despreading step, a diversity combining step for selecting or combining M × N signals obtained in the despreading step for each sequence, and obtaining a K-sequence signal, and K obtained in the diversity combining step And a parallel-serial conversion step of converting a series signal into a serial signal and obtaining a reception signal corresponding to the transmission signal.

  Further, in the eleventh aspect of the invention, on the transmission side, with respect to transmission signals of N (N is an integer of 2 or more) systems different from each other, a spreading code generation step for generating different spreading codes for each system, and for each system, A serial / parallel conversion step for converting the serial transmission signal into a parallel transmission signal of K (K is an integer of 1 or more) series, and spreading generated in the spreading code generation step for each system and for each series The transmission signal is subjected to a spreading process in the time direction with a spreading factor SF (SF is an integer of 2 or more) using a code, and a spreading step for obtaining a signal in one column is obtained in the spreading step for each system. An inverse fast Fourier transform step for performing an inverse fast Fourier transform by placing a K-sequence signal on each subcarrier, and N signals obtained by the inverse fast Fourier transform step are measured for each of the systems in the same frequency band. A transmission step of transmitting from the transmission antennas, and at the reception side, a total of M (M is an integer of 2 or more) total of N signals transmitted from the N transmission antennas. Generated in the receiving step, the fast Fourier transform step for obtaining a K-sequence signal for each receiving antenna, and the spreading code generating step. A despreading code generating step for generating N types of despreading codes corresponding to the spreading code, and a despreading code generating step for the signal of each sequence obtained for each receiving antenna in the fast Fourier transform step. A despreading step of performing despreading processing in the time direction using each generated despreading code to obtain M N systems of K-sequence signals; In addition, a diversity combining step for selecting or combining M signals obtained in the despreading step for each sequence and obtaining K signals of N systems, and a diversity combining step for each system. And a parallel-serial conversion step of converting the received K-sequence signal into a serial signal and obtaining N-system received signals corresponding to the N-system transmission signals.

  A twelfth aspect of the invention includes a spreading code generating step for generating different spreading codes for each system for transmission signals of the same N (N is an integer of 2 or more) systems on the transmission side; The serial transmission signal is converted into a parallel transmission signal of K (K is an integer of 1 or more) series, and the spread code generation step for each system and for each series. The transmission signal is subjected to spreading processing in the time direction with a spreading factor SF (SF is an integer of 2 or more) using the spreading code, and a spreading step for obtaining a signal of one column is obtained in the spreading step for each system. An inverse fast Fourier transform step for performing inverse fast Fourier transform by placing the K-sequence signal on each subcarrier, and N systems of signals obtained by the inverse fast Fourier transform step for each system in the same frequency band Total A transmission step of transmitting from the transmission antennas, and at the reception side, a total of M (M is an integer of 2 or more) total of N signals transmitted from the N transmission antennas. Generated in the receiving step, the fast Fourier transform step for obtaining a K-sequence signal for each receiving antenna, and the spreading code generating step. A despreading code generating step for generating N types of despreading codes corresponding to the spreading code, and a despreading code generating step for the signal of each sequence obtained for each receiving antenna in the fast Fourier transform step. A despreading step of performing despreading processing in the time direction using each generated despreading code to obtain M N-system K-sequence signals; A diversity combining step for selecting or combining the M × N signals obtained in the despreading step to obtain a K-sequence signal, and converting the K-sequence signal obtained in the diversity combining step into a serial signal And a parallel-serial conversion step for obtaining a reception signal corresponding to the transmission signal.

  According to the present invention, in wireless communication in which diversity transmission / reception is performed using a MIMO channel, even if the multiplexing number and the transmission speed in the MIMO channel are changed while the transmission bandwidth remains constant, the number of multiplexing is different as in STC transmission. Alternatively, it is possible to obtain a diversity effect without adding an encoding circuit for each transmission speed, and to provide a diversity communication apparatus and method that are superior to STC transmission in terms of scalability of transmission speed. Can do.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, 2 × 2 MIMO (two transmission antennas and two reception antennas) will be described as an example as in the case of STC transmission shown in FIGS.

(Embodiment 1)
Embodiment 1 of the present invention shows a case where diffusion (time diffusion) is performed in the time direction as a diffusion method.

  FIG. 1 is a block diagram showing a configuration of a transmission apparatus included in a communication apparatus according to Embodiment 1 of the present invention. 1 includes a serial-parallel (hereinafter referred to as S / P) converter 101, spreaders 102-1 and 102-2, spread code generators 103-1 and 103-2, and transmission. And antennas 104-1 and 104-2.

  FIG. 2 is a block diagram showing a configuration of a receiving apparatus included in the communication apparatus according to Embodiment 1 of the present invention. The receiving apparatus shown in FIG. 2 includes receiving antennas 201-1 and 201-2, despreaders 202-1-1 to 202-2-2, despread code generators 203-1 and 203-2, Diversity combining sections 204-1 and 204-2 and a parallel-serial (hereinafter referred to as P / S) converter 205 are provided.

  In the transmission apparatus shown in FIG. 1, two consecutive transmission symbols T1 and T2 having a symbol interval Δt, which are serial transmission signals, are converted by the S / P converter 101 into two parallel transmission signals. At this time, the symbol length of each converted symbol is 2Δt. The symbols T1 and T2 output in parallel from the S / P converter 101 are input to the spreaders 102-1 and 102-2, respectively. On the other hand, spreading code generators 103-1 and 103-2 generate different spreading codes C 1 and C 2 at a spreading code rate of 1 chip per Δt, respectively.

  The spreader 102-1 performs time spreading by multiplying the input symbol T1 by a spreading code C1. At this time, since the spreading code rate is twice the rate of the input transmission symbol, the spreading factor is 2. In this case, the spreader 102-1 outputs chip data T11 and T12 having a symbol interval Δt in response to the input of the symbol T1 having a symbol interval 2Δt. Therefore, the transmission bandwidth after the output of the spreader 102-1 is 1 / (2Δt) before the input to 1 / Δt. Similarly to the symbol T1, the symbol T2 is time-spread using the spreading code C2 in the spreader 102-2, and chip data T21 and T22 are output. The transmission bandwidth is from 1 / (2Δt) to 1 / Δt before and after the input / output of the spreader 102-2.

  The chip data T11 and T12 are transmitted via the transmission antenna 104-1, and the chip data T21 and T22 are transmitted via the transmission antenna 104-2 in the same frequency band (center frequency fc, bandwidth 1 / Δt).

  In the receiving apparatus shown in FIG. 2, the receiving antenna 201-1 includes a signal R11 in which chip data T11 and T21 transmitted simultaneously from the transmitting antennas 104-1 and 104-2 are multiplexed in space, and chip data T12. And T22 receive the signal R12 multiplexed in space. The receiving antenna 201-2 receives the signal R21 in which the chip data T11 and T21 are multiplexed and the signal R22 in which the chip data T12 and T22 are multiplexed.

  Signals R11 and R12 received by receiving antenna 201-1 are input to despreaders 202-1-1 and 202-1-2. The signals R21 and R22 received by the receiving antenna 201-2 are input to the despreaders 202-2-1 and 202-2-2. On the other hand, the despread code generators 203-1 and 203-2 generate despread codes C1 and C2 that are the same as the spread codes generated by the spread code generators 103-1 and 103-2 of the transmission device, respectively.

  The despreaders 202-1-1 and 202-1-2 perform despreading processing in the time direction by multiplying the signals R11 and R12 by despreading codes C1 and C2, respectively, and transmit symbols T1 and T2 The received symbols T′11 and T′21 corresponding to are separated and detected. The despreaders 202-2-1 and 202-2-2 perform despreading processing in the time direction by multiplying the signals R21 and R22 by despreading codes C1 and C2, respectively, and transmit symbols T1 , Receive symbols T′12 and T′22 corresponding to T2 are detected separately. After the despreading process, the symbol intervals of the received symbols T′11, T′21, T′12, and T′22 are 2Δt. Therefore, the transmission bandwidth after the output from the despreaders 202-1-1 and 202-2-2 is 1 / (2Δt) from 1 / Δt before the input.

  Received symbols T′11 and T′12 detected by despreaders 202-1-1 and 202-2-1 are input to diversity combining section 204-1 and despreaders 202-1-2 and 202-2. -2 detected by -2 is input to diversity combining section 204-2. Diversity combining section 204-1 performs two-branch diversity combining using selection or combining on input T′11 and T′12, and outputs received symbol T′1 corresponding to transmission symbol T1. Also, diversity combining section 204-2 performs two-branch diversity combining using selection or combining on input T′21 and T′22, and outputs received symbol T′2 corresponding to transmission symbol T2. To do. Received symbols T′1 and T′2 output in parallel from diversity combining sections 204-1 and 204-2 are converted into serial signals by P / S converter 205.

  In the first embodiment, the case where the two transmission symbols T1 and T2 are different from each other is shown. However, when they are the same, the despreaders 202-1-1 to 2022-2 are used. With respect to all the received symbols detected by the above, four-diversity combining can be performed by one diversity combining unit.

  In the first embodiment, the communication device sets the baseband speed to 1 symbol per Δt, the spatial multiplexing number 2, and the transmission bandwidth between the transmitting and receiving antennas, as in the STC transmission example shown in FIGS. Communication is performed as 1 / Δt, and a space diversity effect can be obtained as in STC transmission.

  The effects of the present invention will be described below with reference to the drawings.

  FIG. 3 is a block diagram showing a configuration of a transmission apparatus using conventional STC transmission, and FIG. 4 is a block diagram showing a configuration of the transmission apparatus using the communication method of the present invention. Each of the transmission apparatuses shown in FIGS. 3 and 4 can change the baseband speed with a switch under the condition that the transmission bandwidth is constant, and includes two transmission antennas.

  In the STC transmission shown in FIG. 3, when the baseband speed is changed by the switch 301, different STC encoders 302-1, 302-2,..., 302-N are required depending on each baseband speed. On the other hand, in the communication method of the present invention shown in FIG. 4, even if the baseband speed is changed by the switch 401, the same spreaders 403-1 and 403-2 and spreading code generators 404-1 and 404-2 are connected. Use it. That is, the communication method of the present invention is superior to STC transmission in terms of scalability of baseband speed.

  Even when the spatial multiplexing number changes, STC transmission requires different STC encoders for each spatial multiplexing number, whereas in the communication method of the present invention, the same number of spreaders according to the spatial multiplexing number is used. A spreading code generator may be used. That is, the communication method of the present invention is superior to STC transmission in terms of scalability of the spatial multiplexing number.

(Embodiment 2)
Embodiment 2 of the present invention shows a case where spreading (frequency spreading) is performed in the frequency direction as a spreading method, and OFDM (Orthogonal Frequency Division Multiplexing) transmission is performed. Here, the diffusion rate is 2.

  FIG. 5 is a block diagram showing a configuration of a transmission apparatus included in the communication apparatus according to Embodiment 2 of the present invention. 5 includes serial / parallel (hereinafter referred to as S / P) converters 501, 502-1 and 502-2, and spreaders 503-1-1 to 503-1-n, 503. 2-1 to 503-2-n, spreading code generators 504-1 and 504-2, inverse fast Fourier transform (hereinafter referred to as IFFT) units 505-1 and 505-2, and a transmitting antenna 506-1 , 506-2. IFFT units 505-1 and 505-2 are provided corresponding to the respective transmission antennas.

  FIG. 6 is a block diagram showing a configuration of a receiving apparatus included in the communication apparatus according to Embodiment 2 of the present invention. The receiving apparatus shown in FIG. 6 includes receiving antennas 601-1 and 601-2, fast Fourier transform (hereinafter referred to as FFT) units 602-1 and 602-2, and a despreader 603-1-1-1. 603-1-n-1, 603-2-1-1 to 603-2-n-1, 603-1-1-2 to 603-1-n-2, 603-2-1-2 to 603 -N-2, despreading code generators 604-1 and 604-2, diversity combining units 605-1-1 to 605-1-n, 605-2-1 to 605-2-n, And parallel / serial (hereinafter referred to as P / S) converters 606-1, 606-2, and 607. FFT sections 602-1 and 602-2 are provided corresponding to the respective reception antennas.

  In the transmission apparatus shown in FIG. 5, transmission symbols (eg, T1 and T2) having a symbol interval Δt that are serial transmission signals are converted into two parallel signals by an S / P converter 501. In FIG. 5, the transmission symbols before and after the transmission symbols T1 and T2 are omitted. Each transmission symbol output in parallel to the two systems is input to S / P converters 502-1 and 502-2 for each system. In this embodiment, since the OFDM transmission scheme is used, S / P converters 502-1 and 502-2 convert the symbols input in series into n series parallel symbols. At this time, the symbol interval of each transmission symbol output from the S / P converters 502-1 and 502-2 is 2nΔt, and the transmission bandwidth is 1 / (2nΔt).

  The n-sequence symbols output from the S / P converter 502-1 use the spread code C1 generated by the spread code generator 504-1 by the spreaders 503-1-1 to 503-1-n, respectively. Diffusion processing is performed. Similarly, the n-sequence symbols output from the S / P converter 502-2 are respectively transmitted to the spread code C2 generated by the spread code generator 504-2 by the spreaders 5032-1 to 503-2-n. Is used for diffusion processing. Here, it is assumed that the spread codes C1 and C2 are orthogonal to each other. Each spreader 503 outputs two chip data for each symbol. Since these two chip data are arranged in parallel on the frequency axis, the transmission bandwidth of each symbol is 1 / (nΔt).

  The chip data of 2n columns output from the spreaders 503-1-1 to 503-1-n are arranged on 2n subcarriers, and subjected to inverse fast Fourier transform by the IFFT unit 505-1, and one system of OFDM signals It becomes. Similarly, 2n-row chip data output from the spreaders 503-2-1 to 503-2-n are arranged on 2n subcarriers and inverse fast Fourier transformed by the IFFT unit 505-2. OFDM signal.

  In FIG. 5, the transmission symbol T1 is spread by a spreader 503-1-m (m is an integer between 1 and n) and is spread into data in units of chips with a spread code C1, and two pieces of chip data T11 and T12 after spreading are processed. Are arranged on two subcarriers. In addition, the transmission symbol T2 is spread by the spreader 503-2-m (m is an integer from 1 to n) into data in units of chips with the spread code C2, and the two pieces of chip data T21 and T22 after spreading are: Arranged on two subcarriers. Here, it is assumed that chip data T11 and T21 and T12 and T22 are arranged on the same subcarrier. In FIG. 5, the subcarrier in which T11 and T21 are arranged and the subcarrier in which T12 and T22 are arranged are adjacent to each other.

  The OFDM signals generated by the IFFT units 505-1 and 505-2 are transmitted to the reception device via the transmission antennas 506-1 and 506-2, respectively. At this time, the chip data T11 and T12 are included in the OFDM signal transmitted from the transmission antenna 506-1, and the chip data T21 and T22 are included in the OFDM signal transmitted from the transmission antenna 506-2.

  The OFDM signal transmitted from the transmission device is received by the reception device illustrated in FIG. 6 via the reception antennas 601-1 and 601-2. At this time, each receiving antenna receives a signal obtained by spatially multiplexing two systems of OFDM signals transmitted from the transmitting apparatus.

  The OFDM signals received by the receiving antennas 601-1 and 601-2 are subjected to fast Fourier transform by the FFT units 602-1 and 602-2, respectively, and become 2n columns of parallel signals that are signals for each subcarrier. The 2n-sequence signals output from the FFT unit 602-1 are input to the despreaders 603-1-1-1 to 603-1-n-1 for each sequence, and the despreaders 603-for each sequence. 1-1-2 to 603-1-n-2. The 2n-sequence signal output from the FFT unit 602-2 is input to the despreaders 603-2-1-1 to 603-2-n-1 for each sequence, and the despreader for each sequence. 603-2-1-2 to 603-2-n-2. Here, since the number of sequences is n, two columns of signals are input to each despreader 603.

  Each of the despreaders 603-1-1-1 to 603-1-n-1 and 603-2-1-1 to 603-2-n-1 performs despreading on the input two columns of signals. A despreading process is performed with the despread code C1 generated by the code generator 604-1, and a signal of one column is output. In addition, each of the despreaders 603-1-1-2 to 603-1-n-2 and 603-2-1-2 to 603-2-n-2 A despreading process is performed with the despreading code C2 generated by the despreading code generator 604-2, and a signal of one column is output.

  In FIG. 6, the despreader 603-1-m-1 converts the signal R11 for each subcarrier in which the chip data T11 and T21 are multiplexed and the signal R12 for each subcarrier in which the chip data T12 and T22 are multiplexed. On the other hand, the despreading process is performed using the despread code C1, and the reception symbol T′11 corresponding to the transmission symbol T1 is detected. The despreader 603-1-m-2 performs despread processing on the signals R11 and R12 using the despread code C2, and detects the reception symbol T′21 corresponding to the transmission symbol T2. The despreader 603-2-m-1 performs inverse processing on the signal R21 for each subcarrier in which the chip data T11 and T21 are multiplexed and the signal R22 for each subcarrier in which the chip data T12 and T22 are multiplexed. A despreading process is performed using the spread code C1 to detect a reception symbol T′12 corresponding to the transmission symbol T1. The despreader 603-2-m-2 performs despread processing on the signals R21 and R22 using the despread code C2, and detects the reception symbol T′22 corresponding to the transmission symbol T2. Here, the transmission bandwidth of the signal after the output from the despreader 603 is changed from 1 / (nΔt) to 1 / (2nΔt) before the input.

  N-sequence received symbols detected by despreaders 603-1-1-1 to 603-1-n-1 and detected by despreaders 603-2-1-1 to 603-2-n-1 The n series of received symbols are input to diversity combining sections 605-1-1 to 605-1-n for each series. In addition, the n-sequence received symbols detected by the despreaders 603-1-1-2 to 603-1-n-2 and the despreaders 603-2-1-2 to 603-2-n-2 are detected. The received n series of received symbols are input to diversity combining sections 605-2-1 to 605-2-n for each series.

  Diversity combining sections 605-1-1 to 605-1-n perform two-branch diversity combining using selection or combining on the input received symbols, and output n-sequence symbols. Also, diversity combining sections 605-2-1 to 605-2-n perform 2-branch diversity combining using selection or combining on the input received symbols and output n-sequence symbols.

  The n-series parallel symbols output from diversity combining sections 605-1-1 to 605-1-n are converted into parallel / serial data corresponding to S / P converter 502-1 by P / S converter 606-1. Conversion is performed and converted into a serial received signal. In addition, the n series parallel symbols output from the diversity combining units 605-2-1 to 605-2-n are parallel-corresponding to the S / P converter 502-2 by the P / S converter 606-2. / Serial conversion is performed and converted into a serial received signal.

  Further, the two systems of received signals output from the P / S converters 606-1 and 606-2 are subjected to parallel / serial conversion corresponding to the S / P converter 501 by the P / S converter 607. It is converted into a serial received signal. Here, the symbol interval of the symbols output from the P / S converter 607 is the same Δt as before the input of the S / P converter 501.

  In the second embodiment, the case where the two transmission symbols T1 and T2 are different from each other is shown. However, in the case where they are the same, for example, the despreaders 603-1-m-1, 603- With respect to all received symbols detected by 2-m-1, 603-1-m-2, and 603-2-m-2, one branching diversity unit can perform four-branch diversity combining.

  In the second embodiment, the communication apparatus sets the baseband speed to 1 symbol per Δt, the spatial multiplexing number 2, and the transmission bandwidth between the transmitting and receiving antennas, as in the STC transmission examples shown in FIGS. Communication is performed as 1 / Δt, and a space diversity effect can be obtained as in STC transmission. Further, in the second embodiment, since frequency spreading is performed, a frequency diversity effect can also be obtained.

  In the second embodiment, frequency spreading is performed and OFDM transmission is performed. However, the same effect as in the first embodiment in which time spreading is performed can be obtained. That is, under the condition that the transmission bandwidth is constant, in the case of STC transmission, a different STC encoder must be used for each spatial multiplexing number and for each baseband rate. In this embodiment, the spatial multiplexing number and the baseband rate are used. Even if it changes, the same spreader and spreading code generator may be used, which is superior to STC transmission in terms of transmission rate scalability.

(Embodiment 3)
Embodiment 3 of the present invention shows a case where OFDM is performed by performing spreading (time spreading) in the time direction as a spreading method. Here, the diffusion rate is 2.

  FIG. 7 is a block diagram showing a configuration of a transmission apparatus included in the communication apparatus according to Embodiment 3 of the present invention. 7 includes serial / parallel (hereinafter referred to as S / P) converters 701, 702-1 and 702-2, and spreaders 703-1-1 to 703-1-n and 703-. 2-1 to 703-2-n, spreading code generators 704-1 and 704-2, inverse fast Fourier transform (hereinafter referred to as IFFT) units 705-1 and 705-2, and a transmission antenna 706-1. , 706-2. IFFT units 705-1 and 705-2 are provided corresponding to the respective transmission antennas.

  FIG. 8 is a block diagram showing a configuration of a receiving apparatus included in the communication apparatus according to Embodiment 3 of the present invention. The receiving apparatus shown in FIG. 8 includes receiving antennas 801-1 and 801-2, fast Fourier transform (hereinafter referred to as FFT) units 802-1 and 802-2, and a despreader 803-1-1-1. -803-1-n-1, 803-2-1-1 to 803-2-n-1, 803-1-1-2 to 803-1-n-2, 803-2-1-2 to 803 -2-n-2, despread code generators 804-1 and 804-2, diversity combining units 805-1-1 to 805-1-n, 8052-1 to 805-2-n, Parallel / serial (hereinafter referred to as P / S) converters 806-1, 806-2, and 807. FFT sections 802-1 and 802-2 are provided corresponding to the respective receiving antennas.

  In the transmission apparatus shown in FIG. 7, transmission symbols (for example, T1 and T2) having a symbol interval Δt, which are serial transmission signals, are converted into two parallel signals by an S / P converter 701. In FIG. 7, the transmission symbols before and after the transmission symbols T1 and T2 are omitted. Each transmission symbol output in parallel to the two systems is input to S / P converters 702-1 and 702-2 for each system. In this embodiment, since the OFDM transmission scheme is used, S / P converters 702-1 and 702-2 convert symbols input in series into n series parallel symbols. At this time, the symbol interval of each transmission symbol output from the S / P converters 702-1 and 702-2 is 2nΔt, and the transmission bandwidth is 1 / (2nΔt).

  The n-sequence symbols output from the S / P converter 702-1 use the spread code C1 generated by the spread code generator 704-1 by the spreaders 703-1-1 to 703-1-n, respectively. Diffusion processing is performed. Similarly, the n-sequence symbols output from the S / P converter 702-2 are respectively transmitted to the spread code C2 generated by the spread code generator 704-2 by the spreaders 703-2-1 to 703-2-n. Is used for diffusion processing. Here, it is assumed that the spread codes C1 and C2 are orthogonal to each other. Each spreader 703 outputs two chip data for each symbol. The two chip data are arranged in series on one time on one subcarrier. Here, since the spreading code rate is twice the symbol rate before the input of the spreader 703, the transmission bandwidth of each symbol is 1 / (nΔt).

  The n columns of chip data output from the spreaders 703-1-1 to 703-1-n are arranged on n subcarriers, subjected to inverse fast Fourier transform by the IFFT unit 705-1, and one system of OFDM signals It becomes. Similarly, n columns of chip data output from the spreaders 703-2-1 to 703-2-n are arranged on n subcarriers and subjected to inverse fast Fourier transform by the IFFT unit 705-2. OFDM signal.

  In FIG. 7, the transmission symbol T1 is spread by the spreader 703-1-m (m is an integer between 1 and n) and is spread into data in units of chips with the spread code C1, and the two pieces of chip data T11 and T12 after spreading are processed. Are arranged on one subcarrier. In addition, the transmission symbol T2 is spread by the spreader 703-2-m (m is an integer of 1 to n) to the data in units of chips with the spread code C2, and the two chip data T21 and T22 after spreading are: It is arranged on one subcarrier. Here, chip data T11, T12, T21, and T22 are arranged on the same subcarrier.

  The OFDM signals generated by the IFFT units 705-1 and 705-2 are transmitted to the reception apparatuses via the transmission antennas 706-1 and 706-2, respectively. At this time, the chip data T11 and T12 are included in the OFDM signal transmitted from the transmission antenna 706-1, and the chip data T21 and T22 are included in the OFDM signal transmitted from the transmission antenna 706-2.

  The OFDM signal transmitted from the transmission device is received by the reception device shown in FIG. 8 via the reception antennas 801-1 and 801-2. At this time, each receiving antenna receives a signal obtained by spatially multiplexing two systems of OFDM signals transmitted from the transmitting apparatus.

  The OFDM signals received by the receiving antennas 801-1 and 801-2 are fast Fourier transformed by the FFT units 802-1 and 802-2, respectively, and become n columns of parallel signals that are signals for each subcarrier. The n columns of signals output from the FFT unit 802-1 are input to the despreaders 803-1-1-1 to 803-1-n-1 for each sequence, and the despreaders 803-3 for each sequence. 1-1-2 to 803-1-n-2. In addition, the n-column signals output from the FFT unit 802-2 are input to the despreaders 803-2-1-1 to 803-2-n-1 for each series, and the despreaders for each series. 803-2-1-2 to 803-2-n-2. Here, since the number of sequences is n, one column of signals is input to each despreader.

  Each of the despreaders 803-1-1-1 to 803-1-n-1 and 803-2-1-1 to 803-2-n-1 is a despread code generator for the input signal. A despreading process in the time direction is performed using the despreading code C1 generated in 804-1. In addition, each of the despreaders 803-1-1-2 to 803-1-n-2 and 803-2-1-2 to 803-2-n-2 performs a despread code on the input signal. A despreading process in the time direction is performed using the despreading code C2 generated by the generator 804-2.

  In FIG. 8, the despreader 803-1-m-1 converts the signal R11 for each subcarrier in which the chip data T11 and T21 are multiplexed and the signal R12 for each subcarrier in which the chip data T12 and T22 are multiplexed. On the other hand, the despreading process is performed using the despread code C1, and the reception symbol T′11 corresponding to the transmission symbol T1 is detected. Despreader 803-1-m-2 performs despreading processing on signals R11 and R12 using despreading code C2, and detects reception symbol T′21 corresponding to transmission symbol T2. The despreader 803-2-m-1 performs inverse processing on the signal R21 for each subcarrier in which the chip data T11 and T21 are multiplexed and the signal R22 for each subcarrier in which the chip data T12 and T22 are multiplexed. A despreading process is performed using the spread code C1 to detect a reception symbol T′12 corresponding to the transmission symbol T1. The despreader 803-2-m-2 performs despread processing on the signals R21 and R22 using the despread code C2, and detects the reception symbol T′22 corresponding to the transmission symbol T2. Here, the transmission bandwidth of the signal after the output from the despreader 803 is changed from 1 / (nΔt) to 1 / (2nΔt) before the input.

  Despreaders 803-1-1-1 to 803-1-n-1, 803-2-1-1 to 803-2-n-1, 803-1-1-2 to 803-1-n-2 , 802-2-1-2 to 803-2-n-2, two two-system received n-sequence symbols are received by diversity combining sections 805-1-1-1. Diversity combining is performed by 805-1-n and 8052-1 to 805-2-n, and parallel / serial conversion is performed by P / S converters 806-1, 806-2, and 807, and a serial signal corresponding to a transmission signal is serially converted. Received signal.

  In the third embodiment, the case where the two transmission symbols T1 and T2 are different from each other is shown. However, when they are the same, for example, despreaders 803-1-m-1, 803- With respect to all received symbols detected by 2-m-1, 803-1-m-2, and 803-2-m-2, one-diversity combining unit can perform 4-branch diversity combining.

  In the third embodiment, the communication device sets the baseband speed to 1 symbol per Δt, the spatial multiplexing number 2, and the transmission bandwidth between the transmitting and receiving antennas, as in the STC transmission examples shown in FIGS. Communication is performed as 1 / Δt, and a space diversity effect can be obtained as in STC transmission.

  In the third embodiment, time spreading is performed and OFDM transmission is performed, but the same effect as in the first embodiment can be obtained. That is, under the condition that the transmission bandwidth is constant, in the case of STC transmission, a different STC encoder must be used for each spatial multiplexing number and for each baseband rate. In this embodiment, the spatial multiplexing number and the baseband rate are used. Even if it changes, the same spreader and spreading code generator may be used, which is superior to STC transmission in terms of transmission rate scalability.

It is a block diagram which shows the structure of the transmitter which the communication apparatus which concerns on Embodiment 1 of this invention comprises. It is a block diagram which shows the structure of the receiver which the communication apparatus which concerns on Embodiment 1 of this invention comprises. It is a block diagram which shows the structure of the transmitter using the conventional STC transmission. It is a block diagram which shows the structure of the transmitter using the communication method of this invention. It is a block diagram which shows the structure of the transmitter which the communication apparatus which concerns on Embodiment 2 of this invention comprises. It is a block diagram which shows the structure of the receiver which the communication apparatus which concerns on Embodiment 2 of this invention comprises. It is a block diagram which shows the structure of the transmitter with which the communication apparatus which concerns on Embodiment 3 of this invention comprises. It is a block diagram which shows the structure of the receiver which the communication apparatus which concerns on Embodiment 3 of this invention comprises. It is a block diagram which shows the structure of the transmitter in the case of performing the conventional STC transmission using a 2x2 MIMO channel. It is a block diagram which shows the structure of the receiver in the case of performing the conventional STC transmission using a 2x2 MIMO channel.

Explanation of symbols

101 Serial / Parallel Converter 102-1 and 102-2 Spreader 103-1 and 103-2 Spreading Code Generator 104-1 and 104-2 Transmitting Antenna 201-1 and 201-2 Receiving Antenna 202-1-1 202-1-2, 202-2-1, 202-2-2 Despreader 203-1, 203-2 Despread code generator 204-1, 204-2 Diversity combiner 205 Parallel / serial converter 301 Switch 302-1 to 302-N STC encoder 303 switch 304-1, 304-2 transmitting antenna 401 switch 402 serial / parallel converter 403-1, 403-2 spreader 404-1, 404-2 spreading code generator 405 -1, 405-2 Transmitting antenna 501, 502-1, 502-2 Serial / parallel converter 503 -1 to 503-1-n, 503-2-1 to 503-2-n spreaders 504-1 and 504-2 spreading code generators 505-1 and 505-2 inverse fast Fourier transform units 506-1 and 506 -2 Transmitting antenna 601-1, 601-2 Receiving antenna 602-1, 602-2 Fast Fourier transform section 603-1-1-1 to 603-1-n-1, 603-2-1-1 to 603- 2-n-1, 603-1-1-2 to 603-1-n-2, 603-2-1-2 to 603-2-n-2 despreader 604-1, 604-2 despread code Generators 605-1-1 to 605-1-n, 605-2-1 to 605-2-n Diversity combining units 606-1, 606-2, 607 Parallel / serial converters 701, 702-1, 702 2 Serial / parallel converter 703-1-1 703-1-n, 703-2-1 to 703-2-n Spreader 704-1, 704-2 Spreading code generator 705-1, 705-2 Inverse fast Fourier transform unit 706-1, 706-2 Transmission Antenna 801-1, 801-2 Receiving antenna 802-1, 802-2 Fast Fourier transform unit 803-1-1-1 to 803-1-n-1, 803-2-1-1 to 803-2-n -1, 803-1-1-2 to 803-1-n-2, 803-2-1-2 to 803-2-n-2 despreader 804-1, 804-2 despread code generator 805 -1-1 to 805-1-n, 805-2-1 to 805-2-n Diversity combiner 806-1, 806-2, 807 Parallel / serial converter

Claims (12)

A total of N spreading code generating means for generating different spreading codes for each of the N transmission systems of N (N is an integer of 2 or more) systems different from each other;
For each of the systems, a total of N spreading means for performing spreading processing on the transmission signal using the spreading code generated by the spreading code generating means;
For each of the systems, a total of N transmitting antennas that transmit the signal obtained by the spreading means in the same frequency band;
A transmission device comprising:
A total of M (M is an integer of 2 or more) receiving antennas that respectively receive N signals transmitted from the N transmitting antennas;
A total of N despread code generating means for generating a despread code corresponding to the spread code generated by each of the spread code generating means;
A despreading process is performed on the signals received by the receiving antennas using the despreading codes generated by the despreading code generating means to obtain M N signals, for a total of M × N despreading signals. Spreading means;
A total of N diversity combining means for selecting or combining the signals obtained by the M despreading means for each of the systems and obtaining N received signals corresponding to the N transmitted signals;
Diversity communication apparatus comprising: a receiving apparatus comprising: A total of N spread code generating means for generating different spread codes for each of the transmission signals of the same N (N is an integer of 2 or more) lines;
For each of the systems, a total of N spreading means for performing spreading processing on the transmission signal using the spreading code generated by the spreading code generating means;
For each of the systems, a total of N transmitting antennas that transmit the signal obtained by the spreading means in the same frequency band;
A transmission device comprising:
A total of M (M is an integer of 2 or more) receiving antennas that respectively receive N signals transmitted from the N transmitting antennas;
A total of N despread code generating means for generating a despread code corresponding to the spread code generated by each of the spread code generating means;
A despreading process is performed on the signals received by the receiving antennas using the despreading codes generated by the despreading code generating means to obtain M N signals, for a total of M × N despreading signals. Spreading means;
A total of one diversity combining means for selecting or combining the signals obtained by the M × N despreading means and obtaining a received signal corresponding to the transmission signal;
Diversity communication apparatus comprising: a receiving apparatus comprising: A total of N spreading code generating means for generating different spreading codes for each system for transmission signals of N different systems (N is an integer of 2 or more);
A total of N serial / parallel conversion means for converting the serial transmission signals into parallel transmission signals of K (K is an integer of 1 or more) series for each of the systems;
The transmission signal is subjected to spreading processing in the frequency direction with a spreading factor SF (SF is an integer of 2 or more) using the spreading code generated by the spreading code generating means for each system and for each sequence. A total of N × K spreading means for obtaining a signal of the column;
For each of the systems, a total of N inverse fast Fourier transform means for performing the inverse fast Fourier transform by arranging the signal of the K-sequence SF sequence obtained by the K spreading means on each subcarrier,
For each of the systems, a total of N transmitting antennas that transmit the signal obtained by the inverse fast Fourier transform means in the same frequency band;
A transmission device comprising:
A total of M (M is an integer of 2 or more) receiving antennas that respectively receive N signals transmitted from the N transmitting antennas;
A total of M Fast Fourier Transform means for performing Fast Fourier Transform on the signals received by the receiving antennas to obtain K-sequence SF-sequence signals;
A total of N despread code generating means for generating a despread code corresponding to the spread code generated by each of the spread code generating means;
A despreading process in the frequency direction is performed on the SF sequence signals obtained by the fast Fourier transform means using the despread code generated by the despread code generating means, and M N N A total of M × N × K despreading means for obtaining K-series signals of the system;
A total of N × K diversity combining means for selecting or combining the signals obtained by the M despreading means for each system and for each series, and obtaining N series of K series signals;
For each of the systems, a total of N parallel series signals are obtained by converting K series signals obtained by the K diversity combining means into serial signals and obtaining N systems of received signals corresponding to the N systems of transmission signals. Conversion means;
Diversity communication apparatus comprising: a receiving apparatus comprising: A total of N spreading code generating means for generating different spreading codes for each system for transmission signals of the same N (N is an integer of 2 or more) systems,
A total of N serial / parallel conversion means for converting the serial transmission signals into parallel transmission signals of K (K is an integer of 1 or more) series for each of the systems;
The transmission signal is subjected to spreading processing in the frequency direction with a spreading factor SF (SF is an integer of 2 or more) using the spreading code generated by the spreading code generating means for each of the systems and for each of the sequences. A total of N × K spreading means for obtaining a signal of the column;
For each of the systems, a total of N inverse fast Fourier transform means for performing the inverse fast Fourier transform by arranging the signal of the K-sequence SF sequence obtained by the K spreading means on each subcarrier,
For each of the systems, a total of N transmitting antennas that transmit the signal obtained by the inverse fast Fourier transform means in the same frequency band;
A transmission device comprising:
A total of M (M is an integer of 2 or more) receiving antennas that respectively receive N signals transmitted from the N transmitting antennas;
A total of M Fast Fourier Transform means for performing Fast Fourier Transform on the signals received by the receiving antennas to obtain K-sequence SF-sequence signals;
A total of N despread code generating means for generating a despread code corresponding to the spread code generated by each of the spread code generating means;
A despreading process in the frequency direction is performed on the SF sequence signals obtained by the fast Fourier transform means using the despread code generated by the despread code generating means, and M N N A total of M × N × K despreading means for obtaining K-series signals of the system;
A total of K diversity combining means for selecting or combining the signals obtained by the M × N despreading means for each sequence to obtain a K-sequence signal;
A total of one parallel / serial conversion means for converting a K-sequence signal obtained by the K diversity combining means into a serial signal and obtaining a reception signal corresponding to the transmission signal;
Diversity communication apparatus comprising: a receiving apparatus comprising: A total of N spreading code generating means for generating different spreading codes for each system for transmission signals of N different systems (N is an integer of 2 or more);
A total of N serial / parallel conversion means for converting the serial transmission signals into parallel transmission signals of K (K is an integer of 1 or more) series for each of the systems;
The transmission signal is subjected to spreading processing in the time direction with a spreading factor SF (SF is an integer of 2 or more) using the spreading code generated by the spreading code generating means for each system and for each sequence, A total of N × K spreading means for obtaining a signal of the column;
For each of the systems, a total of N inverse fast Fourier transform means for placing the K-sequence signal obtained by the K spreading means on each subcarrier and performing inverse fast Fourier transform;
For each of the systems, a total of N transmitting antennas that transmit the signal obtained by the inverse fast Fourier transform means in the same frequency band;
A transmission device comprising:
A total of M (M is an integer of 2 or more) receiving antennas that respectively receive N signals transmitted from the N transmitting antennas;
A total of M fast Fourier transform means for performing fast Fourier transform on the signals received by the receiving antennas to obtain K-sequence signals,
A total of N despread code generating means for generating a despread code corresponding to the spread code generated by each of the spread code generating means;
A despreading process in the time direction is performed on the signals of the respective sequences obtained by the fast Fourier transform units using the despreading codes generated by the despreading code generating units, and M N systems of K A total of M × N × K despreading means for obtaining a series of signals;
A total of N × K diversity combining means for selecting or combining the signals obtained by the M despreading means for each system and for each series, and obtaining N series of K series signals;
For each of the systems, a total of N parallel series signals are obtained by converting K series signals obtained by the K diversity combining means into serial signals and obtaining N systems of received signals corresponding to the N systems of transmission signals. Conversion means;
Diversity communication apparatus comprising: a receiving apparatus comprising: A total of N spreading code generating means for generating different spreading codes for each system for transmission signals of the same N (N is an integer of 2 or more) systems,
A total of N serial / parallel conversion means for converting the serial transmission signals into parallel transmission signals of K (K is an integer of 1 or more) series for each of the systems;
The transmission signal is subjected to spreading processing in the time direction with a spreading factor SF (SF is an integer of 2 or more) using the spreading code generated by the spreading code generating means for each system and for each sequence, A total of N × K spreading means for obtaining a signal of the column;
For each of the systems, a total of N inverse fast Fourier transform means for placing the K-sequence signal obtained by the K spreading means on each subcarrier and performing inverse fast Fourier transform;
For each of the systems, a total of N transmitting antennas that transmit the signal obtained by the inverse fast Fourier transform means in the same frequency band;
A transmission device comprising:
A total of M (M is an integer of 2 or more) receiving antennas that respectively receive N signals transmitted from the N transmitting antennas;
A total of M fast Fourier transform means for performing fast Fourier transform on the signals received by the receiving antennas to obtain K-sequence signals,
A total of N despread code generating means for generating a despread code corresponding to the spread code generated by each of the spread code generating means;
A despreading process in the time direction is performed on the signals of the respective sequences obtained by the fast Fourier transform units using the despreading codes generated by the despreading code generating units, and M N systems of K A total of M × N × K despreading means for obtaining a series of signals;
A total of K diversity combining means for selecting or combining the signals obtained by the M × N despreading means for each sequence to obtain a K-sequence signal;
A total of one parallel / serial conversion means for converting a K-sequence signal obtained by the K diversity combining means into a serial signal and obtaining a reception signal corresponding to the transmission signal;
Diversity communication apparatus comprising: a receiving apparatus comprising: On the sending side,
A spreading code generating step for generating different spreading codes for each of the systems with respect to different N (N is an integer of 2 or more) systems of transmission signals;
For each of the systems, a spreading step for performing spreading processing on the transmission signal using the spreading code generated in the spreading code generation step;
A transmission step of transmitting N systems of signals obtained in the spreading step from a total of N transmission antennas for each system in the same frequency band;
And at the receiving end,
A receiving step of receiving N signals transmitted from the N transmitting antennas by each of a total of M (M is an integer of 2 or more) receiving antennas;
A despreading code generation step for generating N types of despreading codes corresponding to the spreading codes generated in the spreading code generation step;
A despreading step for performing despreading processing on the signals received by the receiving antennas using the N types of despreading codes generated in the despreading code generation step to obtain M N signals;
Diversity combining step for selecting or combining the M signals obtained in the despreading step for each system and obtaining N systems of received signals corresponding to the N systems of transmission signals;
A diversity communication method characterized by comprising: On the sending side,
A spreading code generating step for generating different spreading codes for each of the systems for transmission signals of the same N (N is an integer of 2 or more) systems,
For each of the systems, a spreading step for performing spreading processing on the transmission signal using the spreading code generated in the spreading code generation step;
A transmission step of transmitting N systems of signals obtained in the spreading step from a total of N transmission antennas for each system in the same frequency band;
And at the receiving end,
A receiving step of receiving N signals transmitted from the N transmitting antennas by each of a total of M (M is an integer of 2 or more) receiving antennas;
A despreading code generation step for generating N types of despreading codes corresponding to the spreading codes generated in the spreading code generation step;
A despreading step for performing despreading processing on the signals received by the receiving antennas using the N types of despreading codes generated in the despreading code generation step to obtain M N signals;
A diversity combining step of selecting or combining the M × N signals obtained in the despreading step and obtaining a reception signal corresponding to the transmission signal;
A diversity communication method characterized by comprising: On the sending side,
A spreading code generation step for generating different spreading codes for each system for N (N is an integer of 2 or more) systems of transmission signals different from each other;
A serial-parallel conversion step for converting the serial transmission signal into a parallel transmission signal of a K (K is an integer of 1 or more) series for each of the systems;
The transmission signal is subjected to spreading processing in the frequency direction of the spreading factor SF (SF is an integer of 2 or more) using the spreading code generated in the spreading code generation step for each system and for each sequence, and SF sequence A spreading step to obtain a signal of
For each of the systems, an inverse fast Fourier transform step of performing an inverse fast Fourier transform by arranging the signal of the K-sequence SF sequence obtained in the spreading step on each subcarrier;
A transmission step of transmitting N systems of signals obtained in the inverse fast Fourier transform step from a total of N transmission antennas for each system in the same frequency band;
And at the receiving end,
A receiving step of receiving N signals transmitted from the N transmitting antennas by each of a total of M (M is an integer of 2 or more) receiving antennas;
A fast Fourier transform step of performing a fast Fourier transform on the signal received by each of the receiving antennas to obtain a signal of a K-sequence SF sequence for each of the receiving antennas;
A despreading code generation step for generating N types of despreading codes corresponding to the spreading codes generated in the spreading code generation step;
Perform despreading processing in the frequency direction using each despreading code generated in the despreading code generation step on the SF sequence signal of each sequence obtained for each receiving antenna in the fast Fourier transform step, A despreading step for obtaining M N-system K-sequence signals;
Diversity combining step for selecting or combining the M signals obtained in the despreading step for each system and for each sequence, and obtaining K signals of N systems,
For each of the systems, a parallel-to-serial conversion step of converting the K-sequence signal obtained in the diversity combining step into a serial signal and obtaining N-system received signals corresponding to the N-system transmission signals;
A diversity communication method characterized by comprising: On the sending side,
A spreading code generating step for generating different spreading codes for each system for transmission signals of the same N (N is an integer of 2 or more) systems,
A serial-parallel conversion step for converting the serial transmission signal into a parallel transmission signal of a K (K is an integer of 1 or more) series for each of the systems;
The transmission signal is subjected to spreading processing in the frequency direction of the spreading factor SF (SF is an integer of 2 or more) using the spreading code generated in the spreading code generation step for each system and for each sequence, and SF sequence A spreading step to obtain a signal of
For each of the systems, an inverse fast Fourier transform step of performing an inverse fast Fourier transform by arranging the signal of the K-sequence SF sequence obtained in the spreading step on each subcarrier;
A transmission step of transmitting N systems of signals obtained in the inverse fast Fourier transform step from a total of N transmission antennas for each system in the same frequency band;
And at the receiving end,
A receiving step of receiving N signals transmitted from the N transmitting antennas by each of a total of M (M is an integer of 2 or more) receiving antennas;
A fast Fourier transform step of performing a fast Fourier transform on the signal received by each of the receiving antennas to obtain a signal of a K-sequence SF sequence for each of the receiving antennas;
A despreading code generation step for generating N types of despreading codes corresponding to the spreading codes generated in the spreading code generation step;
Perform despreading processing in the frequency direction using each despreading code generated in the despreading code generation step on the SF sequence signal of each sequence obtained for each receiving antenna in the fast Fourier transform step, A despreading step for obtaining M N-system K-sequence signals;
A diversity combining step for selecting or combining the M × N signals obtained in the despreading step for each sequence and obtaining a K-sequence signal;
A parallel-serial conversion step of converting the K-sequence signal obtained in the diversity combining step into a serial signal and obtaining a reception signal corresponding to the transmission signal;
A diversity communication method characterized by comprising: On the sending side,
A spreading code generation step for generating different spreading codes for each system for N (N is an integer of 2 or more) systems of transmission signals different from each other;
A serial-parallel conversion step for converting the serial transmission signal into a parallel transmission signal of a K (K is an integer of 1 or more) series for each of the systems;
The transmission signal is subjected to spreading processing in the time direction with a spreading factor SF (SF is an integer of 2 or more) using the spreading code generated in the spreading code generation step for each system and for each sequence. A spreading step to obtain a signal of
For each of the systems, an inverse fast Fourier transform step for placing the K-sequence signal obtained in the spreading step on each subcarrier and performing an inverse fast Fourier transform;
A transmission step of transmitting N systems of signals obtained in the inverse fast Fourier transform step from a total of N transmission antennas for each system in the same frequency band;
And at the receiving end,
A receiving step of receiving N signals transmitted from the N transmitting antennas by each of a total of M (M is an integer of 2 or more) receiving antennas;
A fast Fourier transform step of performing a fast Fourier transform on the signal received by each of the receiving antennas to obtain a K-sequence signal for each of the receiving antennas;
A despreading code generation step for generating N types of despreading codes corresponding to the spreading codes generated in the spreading code generation step;
A despreading process in the time direction is performed on each series of signals obtained for each receiving antenna in the fast Fourier transform step using each despread code generated in the despread code generation step, A despreading step for obtaining N series of K-sequence signals;
Diversity combining step for selecting or combining the M signals obtained in the despreading step for each system and for each sequence, and obtaining K signals of N systems,
For each of the systems, a parallel-to-serial conversion step of converting the K-sequence signal obtained in the diversity combining step into a serial signal and obtaining N-system received signals corresponding to the N-system transmission signals;
A diversity communication method comprising: On the sending side,
A spreading code generating step for generating different spreading codes for each system for transmission signals of the same N (N is an integer of 2 or more) systems,
A serial-parallel conversion step for converting the serial transmission signal into a parallel transmission signal of a K (K is an integer of 1 or more) series for each of the systems;
The transmission signal is subjected to spreading processing in the time direction with a spreading factor SF (SF is an integer of 2 or more) using the spreading code generated in the spreading code generation step for each system and for each sequence. A spreading step to obtain a signal of
For each of the systems, an inverse fast Fourier transform step for placing the K-sequence signal obtained in the spreading step on each subcarrier and performing an inverse fast Fourier transform;
A transmission step of transmitting N systems of signals obtained in the inverse fast Fourier transform step from a total of N transmission antennas for each system in the same frequency band;
And at the receiving end,
A receiving step of receiving N signals transmitted from the N transmitting antennas by each of a total of M (M is an integer of 2 or more) receiving antennas;
A fast Fourier transform step of performing a fast Fourier transform on the signal received by each of the receiving antennas to obtain a K-sequence signal for each of the receiving antennas;
A despreading code generation step for generating N types of despreading codes corresponding to the spreading codes generated in the spreading code generation step;
A despreading process in the time direction is performed on each series of signals obtained for each receiving antenna in the fast Fourier transform step using each despread code generated in the despread code generation step, A despreading step for obtaining N series of K-sequence signals;
A diversity combining step for selecting or combining the M × N signals obtained in the despreading step for each sequence and obtaining a K-sequence signal;
A parallel-serial conversion step of converting the K-sequence signal obtained in the diversity combining step into a serial signal and obtaining a reception signal corresponding to the transmission signal;
A diversity communication method characterized by comprising: