阅读说明：本技术 发送装置、接收装置及无线通信系统 (Transmission device, reception device, and wireless communication system ) 是由 平明德 佐野裕康 增田进二 于 2019-03-08 设计创作，主要内容包括：具备：时频空间编码部(14),其对调制后的符号串进行编码处理而生成多个层用的符号串；发送块图案生成部(15),其生成包含1个以上的单位块的发送块图案,该单位块包含由在时间方向或频率方向上连续的资源构成的1个以上的数据块及空符号；副载波映射部(20),其在时间方向及频率方向上重复配置发送块图案,将多个层用的符号串映射到副载波上；以及发送处理部(25-1～25-N),其发送由副载波映射部(20)映射的多个信号。(The disclosed device is provided with: a time-frequency space encoding unit (14) that generates symbol strings for a plurality of layers by encoding the modulated symbol strings; a transmission block pattern generation unit (15) that generates a transmission block pattern including 1 or more unit blocks including 1 or more data blocks and null symbols, the data blocks being composed of resources that are contiguous in the time direction or the frequency direction; a subcarrier mapping unit (20) that maps symbol sequences for a plurality of layers to subcarriers by repeatedly arranging transmission block patterns in the time direction and the frequency direction; and transmission processing units (25-1 to 25-N) for transmitting the plurality of signals mapped by the subcarrier mapping unit (20).)

1. A transmission apparatus, characterized in that,

the transmission device includes:

an encoding unit that performs encoding processing on the modulated symbol sequence to generate symbol sequences for a plurality of layers;

a transmission block pattern generation unit that generates a transmission block pattern including 1 or more unit blocks including 1 or more data blocks and null symbols, the data blocks being composed of resources that are continuous in the time direction or the frequency direction;

a subcarrier mapping unit that maps the symbol sequences for the plurality of layers to subcarriers by repeatedly arranging the transmission block patterns in a time direction and a frequency direction; and

and a plurality of transmission processing units for transmitting the plurality of signals mapped by the subcarrier mapping unit.

2. The transmission apparatus according to claim 1,

the transmission block pattern is a 1 st pattern obtained by combining pilot symbols for each layer with respect to the unit block.

3. The transmission apparatus according to claim 2,

the transmission block pattern is a 2 nd pattern formed by combining the 1 st pattern and a pattern obtained by cyclically shifting the 1 st pattern in a time direction or a frequency direction without dividing the unit block.

4. The transmission apparatus according to claim 2,

the transmission block pattern is a 3 rd pattern obtained by adding 1 or more data blocks to the 1 st pattern without dividing the unit block.

5. The transmission apparatus according to claim 4,

the transmission block pattern is a 4 th pattern in which the 3 rd pattern and a pattern obtained by cyclically shifting the 3 rd pattern in a time direction or a frequency direction without dividing the unit block are combined.

6. The transmission apparatus according to any one of claims 1 to 5,

the transmission device further includes a random sequence generation unit that generates a random sequence or a specific signal sequence,

the transmission block pattern generating section generates a plurality of transmission block patterns having different patterns,

the subcarrier mapping unit arranges a corresponding transmission block pattern of the plurality of transmission block patterns in a time direction or a frequency direction based on the random sequence or the specific signal sequence.

7. A receiving apparatus that receives a signal transmitted from the transmitting apparatus according to any one of claims 1 to 5,

the receiving apparatus includes:

a transmission block pattern generation unit having the same function as the transmission block pattern generation unit provided in the transmission device;

an interference measurement unit that estimates interference power in a null subcarrier to which a null symbol is mapped, using a received signal of a signal transmitted from the transmission device, based on the transmission block pattern generated by the transmission block pattern generation unit; and

and a decoding unit configured to decode a data block from the received signal based on the transmission block pattern, and generate likelihood information for each symbol based on the interference power information.

8. The receiving device of claim 7,

the receiving apparatus further includes a random sequence generating unit that generates a random sequence or a specific signal sequence,

the transmission block pattern generating section generates a plurality of transmission block patterns having different patterns,

the interference measurement unit estimates interference power by determining the position of the null subcarrier based on the plurality of transmission block patterns and the random sequence or the specific signal sequence,

the decoding unit decodes a data block from the received signal based on the plurality of transmission block patterns and the random sequence or the specific signal sequence, and generates likelihood information of each symbol based on the information of the interference power.

9. A wireless communication system, characterized in that,

the wireless communication system includes the transmission device according to any one of claims 1 to 5 and the reception device according to claim 7, or includes the transmission device according to claim 6 and the reception device according to claim 8.

Technical Field

The present invention relates to a transmitting apparatus, a receiving apparatus, and a wireless communication system having a plurality of antennas.

Background

In recent years, with the advancement of wireless communication technologies, wireless application areas have been expanding to mission-critical applications where failure of information transmission is not permitted. Automatic control of automobiles, trains, and the like, and remote control of robots, construction equipment, and the like are representative applications. In such applications, reliability of wireless transmission is required, but it is not easy to realize due to problems unique to wireless communication, such as blocking between transceivers, generation of multiple reflections, i.e., delay waves, high-speed fluctuation of propagation paths, and interference from other stations. In order to improve the certainty in wireless transmission, a diversity technique for performing transmission with redundancy has been developed.

As a general transmission diversity technique, there is a Space Time Block Code (STBC) as follows: the transmitting device uses a plurality of antennas, transmits 1 piece of information to the plurality of antennas and a plurality of time resources in a distributed manner, and combines the information by the receiving device to realize stable communication. In addition, the system is also oriented to cellular systems with Space Frequency Block Codes (SFBC): the transmitting device transmits information to a plurality of antennas and a plurality of subcarriers in the frequency direction in a distributed manner, and the information is combined by the receiving device.

In addition, the reliability of wireless communication in a non-exclusive frequency allocation environment is greatly affected by interference from other systems, as in an ISM (industrial scientific Medical) frequency band. In order to realize highly reliable communication in such an environment, a technique for monitoring the reliability of a signal received by a receiving apparatus is indispensable. Patent document 1 discloses the following technique: data symbols and null symbols are arranged in a two-dimensional plane of a fixed area constituted by time-frequency as a "unit pattern", and the reception power of the null symbol portion is regarded as interference power in the reception station, and the reliability of the peripheral data symbols is determined.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 5900716

Disclosure of Invention

Problems to be solved by the invention

Due to the shortage of frequency resources, it is expected that a large number of users will share the limited frequency ISM band in the future. Further, applications requiring reliability and certainty, such as device control, are also considered to be important targets for wireless communication, not only for information transmission. That is, the effect obtained by combining the transmission diversity technique with the technique of patent document 1 capable of monitoring the interference state of the received signal is required.

In the transmission scheme of patent document 1, several conditions are required for combining space-time and space-frequency diversity techniques such as STBC and SFBC. That is, there is a problem that the following functions are required in the receiving apparatus: a function of estimating transmission path information from each antenna, a setting function of ensuring a "unit pattern" of symbol arrays close to each other in the frequency direction or the time direction, and the like.

The present invention has been made in view of the above circumstances, and an object thereof is to obtain a transmission device capable of realizing communication using transmission diversity in a transmission path environment where interference is expected.

Means for solving the problems

In order to solve the above problems and achieve the object, a transmission device according to the present invention includes: an encoding unit that performs encoding processing on the modulated symbol sequence to generate symbol sequences for a plurality of layers; a transmission block pattern generation unit that generates a transmission block pattern including 1 or more unit blocks including 1 or more data blocks and null symbols, the data blocks being composed of resources that are continuous in the time direction or the frequency direction; a subcarrier mapping unit that maps symbol sequences for a plurality of layers to subcarriers by repeatedly arranging transmission block patterns in the time direction and the frequency direction; and a plurality of transmission processing units for transmitting the plurality of signals mapped by the subcarrier mapping unit.

ADVANTAGEOUS EFFECTS OF INVENTION

The transmission device of the present invention achieves the effect of enabling communication using transmission diversity in a transmission path environment where interference is expected.

Drawings

Fig. 1 is a diagram showing a configuration example of a wireless communication system according to embodiment 1.

Fig. 2 is a block diagram showing a configuration example of a transmission device according to embodiment 1.

Fig. 3 is a flowchart showing the operation of the transmission device according to embodiment 1.

Fig. 4 is a diagram showing a configuration example of the transmission block pattern generating unit according to embodiment 1 and an example of the transmission block pattern generated by the transmission block pattern generating unit.

Fig. 5 is a flowchart showing the operation of the transmission block pattern generation unit according to embodiment 1.

Fig. 6 is a block diagram showing a configuration example of a receiving apparatus according to embodiment 1.

Fig. 7 is a flowchart showing the operation of the receiving apparatus according to embodiment 1.

Fig. 8 is a diagram showing an example of a case where a processing circuit provided in the transmitting device or the receiving device according to embodiment 1 is configured by a processor and a memory.

Fig. 9 is a diagram showing an example of a case where a processing circuit provided in the transmitting device or the receiving device according to embodiment 1 is configured by dedicated hardware.

Fig. 10 is a diagram showing a configuration example of a transmission block pattern generating unit according to embodiment 2 and an example of a transmission block pattern generated by the transmission block pattern generating unit.

Fig. 11 is a flowchart showing the operation of the transmission block pattern generation unit according to embodiment 2.

Fig. 12 is a diagram showing a configuration example of the transmission block pattern generating unit according to embodiment 3 and an example of the transmission block pattern generated by the transmission block pattern generating unit.

Fig. 13 is a flowchart showing the operation of the transmission block pattern generation unit according to embodiment 3.

Fig. 14 is a diagram showing a configuration example of the transmission block pattern generating unit according to embodiment 4 and an example of the transmission block pattern generated by the transmission block pattern generating unit.

Fig. 15 is a flowchart showing the operation of the transmission block pattern generation unit according to embodiment 4.

Fig. 16 is a diagram showing a configuration example of the transmission block pattern generating unit according to embodiment 4 and another example of the transmission block pattern generated by the transmission block pattern generating unit.

Fig. 17 is a block diagram showing a configuration example of a transmission device according to embodiment 5.

Fig. 18 is a flowchart showing the operation of the transmitting apparatus according to embodiment 5.

Fig. 19 is a diagram showing a configuration example of the transmission block pattern generating unit according to embodiment 5 and an example of the transmission block pattern generated by the transmission block pattern generating unit.

Fig. 20 is a diagram showing an example of the arrangement of transmission block patterns in the subcarrier mapping unit according to embodiment 5.

Fig. 21 is a block diagram showing a configuration example of a receiving apparatus according to embodiment 5.

Fig. 22 is a flowchart showing the operation of the receiving apparatus according to embodiment 5.

Fig. 23 is a diagram showing a configuration example of the transmission block pattern generating unit according to embodiment 6 and an example of the transmission block pattern generated by the transmission block pattern generating unit.

Detailed Description

Hereinafter, a transmitting apparatus, a receiving apparatus, and a wireless communication system according to embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiment.

Embodiment 1.

Fig. 1 is a diagram showing a configuration example of a wireless communication system 4 according to embodiment 1of the present invention. A wireless communication system 4 includes base stations 1-a, 1-b, and 1-c and mobile stations 3-a, 3-b, and 3-c. The base stations 1-a, 1-b, 1-c constitute respective cells 2-a, 2-b, 2-c. In the following description, the base station 1 is sometimes referred to as a base station 1 when the base stations 1-a, 1-b, and 1-c are not distinguished, and the cell 2 is sometimes referred to as a cell 2 when the cells 2-a, 2-b, and 2-c are not distinguished. The mobile stations 3-a, 3-b, 3-c communicate with the corresponding base station 1 according to the cell 2 within the service area. In the following description, the mobile station 3-a, 3-b, 3-c may be referred to as the mobile station 3 without distinction.

In a wireless communication system 4, it is desirable that the cells 2 in the vicinity are completely separated in frequency. However, from the viewpoint of frequency use efficiency, it is difficult to allocate different frequencies to all cells 2, and the same frequency is used in cells 2 separated by a fixed distance. In addition, in such a case that a large number of systems share a frequency as in the ISM band, interference from the present system and other systems occurs. Hereinafter, a transmitting apparatus and a receiving apparatus that perform highly reliable communication even in an environment where such interference occurs will be described. In the following, although the description is made on the premise of OFDM (Orthogonal Frequency Division Multiplexing), the present invention is not particularly limited to OFDM as long as it is a communication method for transmitting information by dividing time and Frequency.

The configuration and operation of the transmission device will be described. Fig. 2 is a block diagram showing a configuration example of the transmission device 5 according to embodiment 1. Fig. 3 is a flowchart showing the operation of the transmission device 5 according to embodiment 1. The transmission device 5 corresponds to the base station 1of the wireless communication system 4. The transmitter 5 includes a radio control unit 11, an error correction coding unit 12, a modulation unit 13, a time-frequency space coding unit 14, a transmission block pattern generation unit 15, a subcarrier mapping unit 20, IFFT (Inverse Fast Fourier Transform) units 21-1 to 21-N, GI (Guard Interval) addition units 22-1 to 22-N, radio high-frequency units 23-1 to 23-N, and antennas 24-1 to 24-N. The transmission processing unit 25-1 is constituted by the IFFT unit 21-1, GI adding unit 22-1, radio high frequency unit 23-1 and antenna 24-1, and the transmission processing unit 25-N is constituted by the IFFT unit 21-N, GI adding unit 22-N, radio high frequency unit 23-N and antenna 24-N in the same manner as described later.

In the following description, the IFFT unit 21 is sometimes referred to as an IFFT unit 21 when not distinguishing the IFFT units 21-1 to 21-N, the GI adding unit 22 when not distinguishing the GI adding units 22-1 to 22-N, the wireless high-frequency unit 23 when not distinguishing the wireless high-frequency units 23-1 to 23-N, the antenna 24 when not distinguishing the antennas 24-1 to 24-N, and the transmission processing unit 25 when not distinguishing the transmission processing units 25-1 to 25-N.

The radio control unit 11 receives a bit sequence as information to be transmitted from an upper layer, not shown, and outputs the bit sequence to the error correction coding unit 12 in consideration of the transmission timing. The error correction encoding unit 12 performs error correction encoding on the bit sequence acquired from the radio control unit 11, and outputs the encoded bit sequence (step S1). The modulation unit 13 modulates the error-correction coded bit sequence in a predetermined modulation scheme, and converts the bit sequence into a symbol sequence on the I/Q plane (step S2).

The time-frequency-space encoding unit 14 applies predetermined space-time coding (hereinafter, STBC) or space-frequency coding (hereinafter, SFBC) to the modulated symbol sequence, and outputs a symbol sequence of each layer after encoding (step S3). The time-frequency space encoding unit 14 is an encoding unit that performs encoding processing on the modulated symbol sequence to generate symbol sequences for a plurality of layers. Here, the layer is spatially related and means, for example, a transmission symbol string for each of the antennas 24-1 to 24-N used for transmission. It is not always necessary that 1 layer is associated with 1 antenna, and the transmission device 5 may perform beamforming with a plurality of antennas and transmit each layer as a different beam.

The transmission block pattern generator 15 generates a transmission block pattern, which is a map of subcarriers used for each layer (step S4). The transmission block pattern includes 1 or more minimum unit blocks including 1 or more data blocks and null symbols, each of which is composed of resources continuous in the time direction or the frequency direction. The minimum unit block is a minimum unit block that determines the positions of the data symbol and the null symbol. In the following description, a data block is sometimes referred to as db (data block). The detailed configuration and operation of the transmission block pattern generation unit 15 will be described later.

The subcarrier mapping section 20 maps the symbol sequence of each layer to subcarriers in accordance with the transmission block pattern (step S5). Specifically, the subcarrier mapping section 20 repeatedly arranges the transmission block pattern in the time direction and the frequency direction, and maps symbol strings for a plurality of layers to subcarriers. The subcarrier mapping unit 20 maps each symbol of the symbol sequence to a position of a data block of the transmission block pattern, and maps a null symbol having a power of 0 to a position of a null symbol of the transmission block pattern. The IFFT unit 21 performs IFFT processing on the signal of the corresponding layer arranged by the subcarrier mapping unit 20 in 1OFDM symbol units, and converts the signal from a frequency signal to a time signal (step S6). The GI adding unit 22 adds a GI to the time signal converted by the connected IFFT unit 21 (step S7). The radio high-frequency section 23 converts the signal to which the GI is added by the connected GI addition section 22 from a digital signal to an analog signal, further up-converts the signal (step S8), and transmits the signal from the connected antenna 24 (step S9). In this way, the transmission processing unit 25 transmits the plurality of signals mapped by the subcarrier mapping unit 20.

The configuration and operation of the transmission block pattern generation unit 15 will be described in detail. Fig. 4 is a diagram showing a configuration example of the transmission block pattern generating unit 15 according to embodiment 1 and an example of the transmission block pattern generated by the transmission block pattern generating unit 15. Fig. 5 is a flowchart showing the operation of the transmission block pattern generation unit 15 according to embodiment 1. In fig. 4, although STBC or SFBC of 2 layers is assumed, the description is not limited to 2 layers. The transmission block pattern generator 15 includes a minimum unit block generator 16 and a pilot mapping unit 17.

The minimum unit block generator 16 generates a minimum unit block including a data block constituting a code word of STBC or SFBC and a space for interference measurement (step S11). In the example of fig. 4, 2-layer 2 subcarriers are a unit of STBC or SFBC. Since spatial coding is easily affected by channel variations, each data block is composed of subcarriers that are continuous on the time axis or the frequency axis. In the example of fig. 4, the minimum unit block is composed of 2 data blocks and 2 null symbols.

The pilot mapping unit 17 maps pilot symbols P1, P2 for synchronous detection to the minimum unit block generated by the minimum unit block generating unit 16 (step S12). The pilot mapping unit 17 may add pilot symbols P1 and P2 to the minimum unit block. The pilot symbol P1 is a pilot symbol for layer 0, and the pilot symbol P2 is a pilot symbol for layer 1. In the case of N layers, 1 or more pilot symbols, in total N or more pilot symbols, are allocated to each layer in the pilot mapping unit 17. As shown in the layer 0 transmission pattern of fig. 4, the transmission device 5 transmits a pilot symbol at the position of the pilot symbol P1 in the layer 0, and the position of the pilot symbol P2 becomes a null symbol. Similarly, as shown in the layer 1 transmission pattern of fig. 4, the transmission device 5 transmits a pilot symbol at the position of the pilot symbol P2 in the layer 1, and the position of the pilot symbol P1 becomes a null symbol. The same applies to the case of N layers.

In embodiment 1, the transmission block pattern generator 15 outputs the output of the pilot mapping unit 17 in which the pilot symbols P1 and P2 are mapped to the minimum unit block as a transmission block pattern. That is, the transmission block pattern of embodiment 1 is the 1 st pattern obtained by combining pilot symbols for each layer with respect to the minimum unit block. The subcarrier mapping unit 20 spreads the transmission block pattern acquired from the transmission block pattern generating unit 15 so as to be repeatedly spread on the time-frequency plane as shown in fig. 4, and arranges symbol strings for each layer.

Next, the structure and operation of the receiving apparatus will be described. Fig. 6 is a block diagram showing a configuration example of the receiving apparatus 6 according to embodiment 1. Fig. 7 is a flowchart showing the operation of the receiving apparatus 6 according to embodiment 1. The receiving apparatus 6 corresponds to the mobile station 3 of the above-described radio communication system 4. That is, the receiving apparatus 6 constitutes the wireless communication system 4 together with the transmitting apparatus 5, and receives the signal transmitted from the transmitting apparatus 5. The receiving device 6 includes antennas 30-1 to 30-M, radio high-frequency sections 31-1 to 31-M, synchronizing sections 32-1 to 32-M, GI deleting sections 33-1 to 33-M, FFT (Fast Fourier Transform) sections 34-1 to 34-M, interference measuring sections 35-1 to 35-M, a transmission block pattern generating section 15, a time-frequency space decoding section 36, an error correcting section 37, and a radio control section 38.

In the following description, the antenna 30 is sometimes referred to as an antenna 30 without distinguishing between the antennas 30-1 to 30-M, the wireless rf section 31 without distinguishing between the wireless rf sections 31-1 to 31-M, the synchronizer 32 without distinguishing between the synchronizers 32-1 to 32-M, the GI canceller 33 without distinguishing between the GI cancellers 33-1 to 33-M, the FFT section 34 without distinguishing between the FFT sections 34-1 to 34-M, and the interference measurement section 35 without distinguishing between the interference measurement sections 35-1 to 35-M.

The antenna 30 receives the electric wave (step S21). The receiving apparatus 6 can also receive by 1 antenna in an encoding system represented by STBC, SFBC, or the like, but can also receive by a plurality of antennas in order to improve performance. The radio high-frequency part 31 down-converts the received signal received by the connected antenna 30, and further converts the signal from an analog signal to a digital signal (step S22). The synchronization unit 32 removes the frequency offset from the reception signal digitized by the connected wireless high-frequency unit 31, and detects the reception timing (step S23). The GI deleting unit 33 deletes the GI based on the information of the reception timing detected by the connected synchronizing unit 32 (step S24). The FFT section 34 performs FFT processing on the received signal from which the GI is deleted by the connected GI deletion section 33, and converts the time signal into a complex received signal on the frequency axis (step S25).

The transmission block pattern generator 15 generates a transmission block pattern, which is a map of subcarriers used for each layer (step S26). The operation of the transmission block pattern generator 15 of the reception device 6 is the same as that of the transmission block pattern generator 15 of the transmission device 5. That is, the reception device 6 includes the transmission block pattern generation unit 15 having the same function as the transmission block pattern generation unit 15 included in the transmission device 5. The transmission block pattern generating unit 15 of the reception device 6 generates and outputs the same transmission block pattern as the transmission block pattern generating unit 15 of the transmission device 5.

The interference measurement unit 35 estimates interference power in the null subcarrier to which the null symbol is mapped, using the received signal of the signal transmitted from the transmission device 5, that is, the received complex signal obtained from the connected FFT unit 34, based on the transmission block pattern generated by the transmission block pattern generation unit 15 (step S27). Specifically, the interference measurement unit 35 acquires the position of a null subcarrier, which is a null for interference measurement, from the information of the transmission block pattern, and estimates the interference power at the subcarrier position where the neighboring data block is transmitted, based on the reception power value of the null subcarrier. The interference measurement unit 35 may use only the power value of the nearest null subcarrier or may use the power values of a plurality of neighboring null subcarriers in the estimation of the interference power, and the interference power estimation method is not limited.

The time-frequency space decoding unit 36 is a decoding unit that decodes a data block from a reception signal based on a transmission block pattern. The time-frequency space decoding unit 36 performs weighted combination of information based on the received signals received by the plurality of antennas 30-1 to 30-M based on the information of the interference power estimated by the interference measurement units 35-1 to 35-M, and generates likelihood information for each symbol or each bit unit (step S28). That is, the time-frequency space decoding unit 36 generates likelihood information of each symbol based on the information of the interference power. The error correction unit 37 performs error correction processing based on the likelihood information, and decodes the bit sequence (step S29). The radio control unit 38 outputs the decoded bit sequence to an upper layer, not shown.

Next, the hardware configuration of the transmitter 5 and the receiver 6 will be described. In the transmission device 5, the configuration other than the transmission block pattern generation unit 15 and the subcarrier mapping unit 20 is realized by a normal transmitter. The transmission block pattern generation unit 15 and the subcarrier mapping unit 20 are realized by a processing circuit. In the receiving apparatus 6, the configuration other than the transmission block pattern generating section 15, the interference measuring section 35, and the time-frequency space decoding section 36 is realized by a normal receiver. The transmission block pattern generation unit 15, the interference measurement unit 35, and the frequency space decoding unit 36 are implemented by processing circuits. The processing circuit may be a processor and a memory that execute a program stored in the memory, or may be dedicated hardware.

Fig. 8 is a diagram showing an example of a case where a processing circuit provided in the transmission device 5 or the reception device 6 according to embodiment 1 is configured by a processor and a memory. When the processing circuit includes the processor 91 and the memory 92, the functions of the processing circuit of the transmitting device 5 or the receiving device 6 are realized by software, firmware, or a combination of software and firmware. The software or firmware is described in the form of a program and stored in the memory 92. In the processing circuit, each function is realized by the processor 91 reading out and executing a program stored in the memory 92. That is, the processing circuit includes a memory 92 for storing a program for executing the processing of the transmitting device 5 or the receiving device 6 as a result. Note that these programs can also be said to be programs that cause a computer to execute the steps and methods of the transmitting device 5 or the receiving device 6.

Here, the Processor 91 may be a CPU (Central Processing Unit), a Processing device, an arithmetic device, a microprocessor, a microcomputer, a DSP (Digital Signal Processor), or the like. The Memory 92 may be a nonvolatile or volatile semiconductor Memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash Memory, an EPROM (Erasable Programmable ROM), an EEPROM (registered trademark), a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc), for example.

Fig. 9 is a diagram showing an example of a case where the processing circuit provided in the transmission device 5 or the reception device 6 according to embodiment 1 is configured by dedicated hardware. In the case where the processing Circuit is formed of dedicated hardware, the processing Circuit 93 shown in fig. 9 corresponds to, for example, a single Circuit, a composite Circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. The functions of the transmitting apparatus 5 and the receiving apparatus 6 may be realized by the processing circuit 93 for each function, or the functions may be realized by the processing circuit 93 in a lump.

Further, each function of the transmission device 5 or the reception device 6 may be partially implemented by dedicated hardware, and partially implemented by software or firmware. In this way, the processing circuit can implement the functions described above by dedicated hardware, software, firmware, or a combination thereof.

As described above, according to the present embodiment, the transmission device 5 allocates subcarriers based on the transmission block pattern in which pilot symbols are mapped to the minimum unit block, and transmits a plurality of signals for each layer from the plurality of antennas 24. The receiving apparatus 6 estimates interference power based on the same transmission block pattern as the transmitting apparatus 5, and generates likelihood information for each symbol. Thus, the transmission device 5 and the reception device 6 obtain the transmission diversity effect by the plurality of antennas, and the reception device 6 generates the likelihood information based on the interference power and applies error correction, thereby realizing highly reliable radio transmission.

Further, the transmission device 5 and the reception device 6 can add pilot symbols and use multilevel modulation, thereby increasing the transmission capacity. The transmission device 5 and the reception device 6 can increase the communication distance by applying transmission diversity. The transmission device 5 and the reception device 6 can arbitrarily change the null subcarrier density according to the environmental conditions of the system, and can improve the frequency use efficiency.

Embodiment 2.

In embodiment 2, a transmission block pattern obtained by cyclically shifting the transmission block pattern generated in embodiment 1 is used as the transmission block pattern. A description will be given of a portion different from embodiment 1.

The transmission device 5 according to embodiment 2 has a configuration in which the transmission block pattern generator 15 of the transmission device 5 according to embodiment 1 shown in fig. 2 is replaced with a transmission block pattern generator 15 a. The overall operation flow of the transmission device 5 according to embodiment 2 is the same as the operation flow of the transmission device 5 according to embodiment 1 shown in the flowchart of fig. 3. Similarly, the receiving apparatus 6 according to embodiment 2 has a configuration in which the transmission block pattern generating unit 15a is replaced with the transmission block pattern generating unit 15 of the receiving apparatus 6 according to embodiment 1 shown in fig. 6. The overall operation flow of the receiver 6 according to embodiment 2 is the same as the operation flow of the receiver 6 according to embodiment 1 shown in the flowchart of fig. 7.

The configuration and operation of the transmission block pattern generating unit 15a will be described in detail. Fig. 10 is a diagram showing a configuration example of the transmission block pattern generating unit 15a according to embodiment 2 and an example of the transmission block pattern generated by the transmission block pattern generating unit 15 a. The transmission block pattern generator 15a includes a minimum unit block generator 16, a pilot mapping unit 17, and a cyclic shift unit 19. Fig. 11 is a flowchart showing the operation of the transmission block pattern generation unit 15a according to embodiment 2. In fig. 11, steps S31 and S32 are the same as steps S11 and S12 in the flowchart of embodiment 1 shown in fig. 5.

The cyclic shift section 19 cyclically shifts the pattern in which the pilot symbols P1 and P2 are mapped, that is, mapped, by the pilot mapping section 17 in the time direction (step S33). As shown in fig. 10, the cyclic shift section 19 can generate 2 kinds of patterns, i.e., a case where cyclic shift is not applied to the pattern in which the pilot symbols P1 and P2 are mapped and a case where cyclic shift is applied to the pattern in which the pilot symbols P1 and P2 are mapped. In addition, since the minimum unit block cannot be divided, the number of patterns that can be configured in this example is only 2. The cyclic shift section 19 alternately arranges these 2 patterns to make a transmission block pattern. That is, the transmission block pattern of embodiment 2 is a 2 nd pattern in which the 1 st pattern is combined with a pattern obtained by cyclically shifting the 1 st pattern in the time direction without dividing the minimum unit block.

The transmission device 5 allocates subcarriers based on the transmission block pattern information to which the cyclic shift is applied, and the reception device 6 performs estimation, decoding, and the like of interference power based on the transmission block pattern information to which the cyclic shift is applied, thereby realizing signal transmission.

The hardware configurations of the transmission device 5 and the reception device 6 according to embodiment 2 are the same as those of the transmission device 5 and the reception device 6 according to embodiment 1.

As described above, according to the present embodiment, the transmission block pattern to which the cyclic shift is applied is used for the transmission device 5 and the reception device 6. Thus, the transmission device 5 and the reception device 6 randomize the arrangement of the null symbols in the transmission block pattern, and therefore, can expect further improvement in transmission characteristics as compared with embodiment 1.

Embodiment 3.

In embodiment 3, a transmission block pattern obtained by adding a data block to the transmission block pattern generated in embodiment 1 is referred to as a transmission block pattern. A description will be given of a portion different from embodiment 1.

The transmission device 5 according to embodiment 3 has a configuration in which the transmission block pattern generator 15 of the transmission device 5 according to embodiment 1 shown in fig. 2 is replaced with a transmission block pattern generator 15 b. The overall operation flow of the transmission device 5 according to embodiment 3 is the same as the operation flow of the transmission device 5 according to embodiment 1 shown in the flowchart of fig. 3. Similarly, the receiving apparatus 6 according to embodiment 3 has a configuration in which the transmission block pattern generator 15 of the receiving apparatus 6 according to embodiment 1 shown in fig. 6 is replaced with a transmission block pattern generator 15 b. The overall operation flow of the receiver 6 according to embodiment 3 is the same as the operation flow of the receiver 6 according to embodiment 1 shown in the flowchart of fig. 7.

The configuration and operation of the transmission block pattern generation unit 15b will be described in detail. Fig. 12 is a diagram showing a configuration example of the transmission block pattern generating unit 15b according to embodiment 3 and an example of the transmission block pattern generated by the transmission block pattern generating unit 15 b. The transmission block pattern generator 15b includes a minimum unit block generator 16, a pilot mapping unit 17, and an additional data block mapping unit 18. Fig. 13 is a flowchart showing the operation of the transmission block pattern generation unit 15b according to embodiment 3. In fig. 13, steps S41 and S42 are the same as steps S11 and S12 in the flowchart of embodiment 1 shown in fig. 5.

In the transmission device 5 and the reception device 6, when generating the transmission block pattern, it is sometimes desired to set the number of OFDM symbols, which is a specific time, or the number of subcarriers, which is a specific frequency, as a unit. In this case, the additional data block mapping unit 18 adds the data block so that the transmission block pattern has a desired size (step S43). In the example of fig. 12, the additional data block mapping unit 18 adds 1 data block for 2-layer SFBC to generate a transmission block pattern having 2 subcarriers × 5OFDM symbols as a unit. That is, the transmission block pattern of embodiment 3 is a 3 rd pattern obtained by adding 1 or more data blocks to the 1 st pattern without dividing the minimum unit block.

The transmission device 5 allocates subcarriers based on the transmission block pattern information to which the data block is added, and the reception device 6 performs estimation, decoding, and the like of interference power based on the transmission block pattern information to which the data block is added, thereby realizing signal transmission.

The hardware configurations of the transmission device 5 and the reception device 6 according to embodiment 3 are the same as those of the transmission device 5 and the reception device 6 according to embodiment 1.

As described above, according to the present embodiment, the transmission device 5 and the reception device 6 configure a frame using a transmission block pattern of an arbitrary size. Thus, the transmission device 5 and the reception device 6 can improve the flexibility of the system as compared with embodiment 1.

Embodiment 4.

In embodiment 4, the transmission block pattern obtained by cyclically shifting the transmission block pattern generated in embodiment 3 is used as the transmission block pattern. A description will be given of a portion different from embodiments 1 to 3.

The transmission device 5 according to embodiment 4 has a configuration in which the transmission block pattern generator 15 of the transmission device 5 according to embodiment 1 shown in fig. 2 is replaced with a transmission block pattern generator 15 c. The overall operation flow of the transmission device 5 according to embodiment 4 is the same as the operation flow of the transmission device 5 according to embodiment 1 shown in the flowchart of fig. 3. Similarly, the receiving apparatus 6 according to embodiment 4 has a configuration in which the transmission block pattern generator 15 of the receiving apparatus 6 according to embodiment 1 shown in fig. 6 is replaced with a transmission block pattern generator 15 c. The overall operation flow of the receiver 6 according to embodiment 4 is the same as the operation flow of the receiver 6 according to embodiment 1 shown in the flowchart of fig. 7.

The configuration and operation of the transmission block pattern generation unit 15c will be described in detail. Fig. 14 is a diagram showing a configuration example of the transmission block pattern generating unit 15c according to embodiment 4 and an example of the transmission block pattern generated by the transmission block pattern generating unit 15 c. The transmission block pattern generator 15c includes a minimum unit block generator 16, a pilot mapping unit 17, an additional data block mapping unit 18, and a cyclic shift unit 19. Fig. 15 is a flowchart showing the operation of the transmission block pattern generation unit 15c according to embodiment 4. In fig. 15, steps S51 to S53 are the same as steps S41 to S43 of the flowchart of embodiment 3 shown in fig. 13, and step S54 is the same as step S33 of the flowchart of embodiment 2 shown in fig. 11.

As described above, in embodiment 4, the transmission block pattern generation unit 15c applies cyclic shift by the cyclic shift unit 19 after adding a data block by the added data block mapping unit 18. Specifically, in the example of fig. 14, the transmission block pattern generating unit 15c adds 1 data block for 2-layer SFBC to form a pattern having 2 subcarriers × 5OFDM symbols as a unit, and then combines the pattern of cyclic shift amount 0 and the pattern of cyclic shift amount 1 to generate a transmission block pattern of 4 subcarriers × 5OFDM symbols. That is, the transmission block pattern of embodiment 4 is a 4 th pattern in which the 3 rd pattern and a pattern obtained by cyclically shifting the 3 rd pattern in the time direction without dividing the minimum unit block are combined.

The number of data blocks to be added in the additional data block mapping unit 18 is not limited to 1. Fig. 16 is a diagram showing a configuration example of the transmission block pattern generating unit 15c according to embodiment 4 and another example of the transmission block pattern generated by the transmission block pattern generating unit 15 c. The example of fig. 16 changes the mapping of the additional data block by the additional data block mapping unit 18. When the transmission block pattern of fig. 14 is defined as pattern a, 3 data blocks (DB3, DB4, DB5) for 2-layer SFBC are added as additional data blocks in pattern B shown in fig. 16. In pattern C shown in fig. 16, 4 data blocks (DB3, DB4, DB5, and DB6) for 2-layer SFBC are added as additional data blocks. As described above, the constraint on the application of the cyclic shift in the cyclic shift section 19 is not to divide the minimum unit block. Since the additional data blocks can be divided, the range of application of the shift amount of the cyclic shift can be expanded.

Pattern B shown in fig. 16 shows a case where the transmission block pattern generating unit 15c combines patterns of cyclic shift amounts 0, 1, and 2 to generate a transmission block pattern, and a case where patterns of cyclic shift amounts 0, 2, and 5 are combined to generate a transmission block pattern. In either case, the transmission block pattern generator 15c generates a transmission block pattern of 6 subcarriers × 7OFDM symbols. In pattern C shown in fig. 16, the transmission block pattern generating unit 15C generates a transmission block pattern by combining patterns of cyclic shift amounts 0, 1, 2, and 5, and generates a transmission block pattern by combining patterns of cyclic shift amounts 0, 2, 5, and 7. In either case, the transmission block pattern generator 15c generates a transmission block pattern of 8 subcarriers × 8OFDM symbols. The transmission block pattern generated by the transmission block pattern generating unit 15c is not limited to the examples shown in fig. 14 and 16.

The transmission device 5 allocates subcarriers based on the transmission block pattern information to which the data block is added and the cyclic shift is applied, and the reception device 6 performs estimation, decoding, and the like of interference power based on the transmission block pattern information to which the data block is added and the cyclic shift is applied, thereby realizing signal transmission.

The hardware configurations of the transmission device 5 and the reception device 6 according to embodiment 4 are the same as those of the transmission device 5 and the reception device 6 according to embodiment 1.

As described above, according to the present embodiment, the transmission device 5 and the reception device 6 configure a frame using a transmission block pattern of an arbitrary size, and use a transmission block pattern to which cyclic shift is applied. Thus, the transmission device 5 and the reception device 6 can improve the flexibility of the system, and can randomize the null symbol arrangement to improve the interference resistance.

Embodiment 5.

In embodiment 5, the transmission block pattern generating unit generates a plurality of transmission block patterns. The following description is directed to portions different from embodiments 1 to 4.

First, the configuration and operation of the transmission device will be described. Fig. 17 is a block diagram showing a configuration example of a transmission device 5a according to embodiment 5. Fig. 18 is a flowchart showing the operation of the transmission device 5a according to embodiment 5. The transmission device 5a corresponds to the base station 1of the wireless communication system 4. The transmission device 5a is obtained by deleting the transmission block pattern generation unit 15 and the subcarrier mapping unit 20 from the transmission device 5of embodiment 1 shown in fig. 2, and adding the random sequence generation unit 40, the transmission block pattern generation unit 41, and the subcarrier mapping unit 20 a. The random sequence generator 40 and the transmission block pattern generator 41 are connected to the subcarrier mapping unit 20 a.

In fig. 18, steps S61 to S63 are the same as steps S1 to S3 of the flowchart of embodiment 1 shown in fig. 3. The transmission block pattern generator 41 generates a plurality of transmission block patterns for sequences having different patterns (step S64). The detailed configuration and operation of the transmission block pattern generating unit 41 will be described. Fig. 19 is a diagram showing a configuration example of the transmission block pattern generating unit 41 according to embodiment 5 and an example of the transmission block pattern generated by the transmission block pattern generating unit 41. The transmission block pattern generating unit 41 includes a minimum unit block generating unit 42, a pilot mapping unit 43, an additional data block mapping unit 44, and a cyclic shift unit 45. The minimum unit block generator 42, pilot mapping unit 43, additional data block mapping unit 44, and cyclic shift unit 45 perform operations for generating a plurality of transmission block patterns for sequences, but the operations for generating the transmission block patterns are the same as those of the minimum unit block generator 16, pilot mapping unit 17, additional data block mapping unit 18, and cyclic shift unit 19 according to embodiment 4.

The minimum unit block generator 42 generates a minimum unit block for the sequence "0" and a minimum unit block for the sequence "1". In this case, the size of the time-frequency region, the number of data blocks, and the number of null symbols of the 2 smallest unit blocks are the same, and the positions of the null symbols are different from each other.

The pilot mapping unit 43 arranges pilot symbols P1 and P2 for synchronous detection in the 2 minimum unit blocks generated by the minimum unit block generating unit 42. If the positions of the pilot symbols are the same, the pilot mapping unit 43 may change the association between the pilots and each layer. For example, in the example of fig. 19, the pilot mapping unit 43 maps the pilot symbol P1 to the upper level of the frequency and the pilot symbol P2 to the lower level of the frequency for both the minimum unit block for the sequence "0" and the minimum unit block for the sequence "1", but the pilot symbol P1 may be mapped to the lower level of the frequency and the pilot symbol P2 may be mapped to the upper level of the frequency for the minimum unit block for the sequence "1".

The additional data block mapping unit 44 adds and maps the data block to the pattern to which the pilot symbols P1 and P2 are mapped by the pilot mapping unit 43. In the example of fig. 19, the additional data block mapping unit 44 adds 3 data blocks (DB3, DB4, DB5) for 2-layer SFBC. The added position of the data block is the same for the sequence "0" and the sequence "1".

The cyclic shift unit 45 applies cyclic shift in the time direction to the pattern subjected to the additional data block mapping by the additional data block mapping unit 44, and generates a transmission block pattern by combining a plurality of cyclically shifted patterns. In the example of fig. 19, the cyclic shift unit 45 combines the patterns of cyclic shift amounts 0, 2, and 5 to generate a transmission block pattern. Thereby, the transmission block pattern generator 41 generates a transmission block pattern of 6 subcarriers × 7OFDM symbols.

The transmission block pattern generated by the transmission block pattern generation unit 41 is characterized in that the null symbol for the sequence "0" and the null symbol for the sequence "1" are arranged at different positions, although a pattern of an arbitrary size is generated. Note that the same thing as embodiment 4 and the like does not allow division of the minimum unit block at the time of cyclic shift.

The explanation returns to fig. 18. The random sequence generator 40 generates a random sequence (step S65). The random sequence generator 40 generates pseudo random sequences of "0" and "1", for example. The random sequence generating unit 40 may generate a specific signal sequence.

The subcarrier mapping unit 20a arranges the transmission block pattern for sequence "0" and the transmission block pattern for sequence "1" generated by the transmission block pattern generating unit 41 based on the random sequence acquired from the random sequence generating unit 40. That is, the subcarrier mapping section 20a arranges a corresponding transmission block pattern among the plurality of transmission block patterns in the time direction or the frequency direction based on a random sequence or a specific signal sequence. The subcarrier mapping unit 20a maps the symbol sequence of each layer to subcarriers in accordance with the transmission block pattern (step S66). Fig. 20 is a diagram showing an example of the arrangement of the transmission block pattern in the subcarrier mapping section 20a according to embodiment 5. Fig. 20 shows an example in which the subcarrier mapping section 20a arranges a transmission block pattern in which 6 subcarriers × 7OFDM symbols are arranged in a 24-subcarrier system. In the example of fig. 20, the transmission block pattern is used with priority given to the frequency direction, but the time direction may be used with priority.

The subsequent operations of the transmission device 5a, i.e., the operations of steps S67 to S70 of the flowchart of fig. 18 are the same as the operations of steps S6 to S9 of the flowchart of embodiment 1 shown in fig. 3.

Next, the structure and operation of the receiving apparatus will be described. Fig. 21 is a block diagram showing a configuration example of the receiving apparatus 6a according to embodiment 5. Fig. 22 is a flowchart showing the operation of the receiving apparatus 6a according to embodiment 5. The receiving apparatus 6a corresponds to the mobile station 3 of the above-described radio communication system 4. That is, the receiving apparatus 6a constitutes the wireless communication system 4 together with the transmitting apparatus 5a, and receives the signal transmitted from the transmitting apparatus 5 a. The reception device 6a is obtained by deleting the transmission block pattern generation unit 15, the interference measurement units 35-1 to 35-M, and the frequency space decoding unit 36 from the reception device 6of embodiment 1 shown in fig. 6, and adding the random sequence generation unit 40, the transmission block pattern generation unit 41, the interference measurement units 35a-1 to 35a-M, and the frequency space decoding unit 36 a. The random sequence generator 40 and the transmission block pattern generator 41 are connected to the interference measurement units 35a-1 to 35a-M and the time-frequency space decoder 36 a.

In fig. 22, steps S71 to S75 are the same as steps S21 to S25 of the flowchart of embodiment 1 shown in fig. 7. The transmission block pattern generator 41 generates a plurality of transmission block patterns for sequences having different patterns (step S76). The random sequence generator 40 generates a random sequence (step S77). The operations of the transmission block pattern generator 41 and the random sequence generator 40 are the same as those of the transmission block pattern generator 41 and the random sequence generator 40 of the transmission device 5a described above. In this way, the transmitting apparatus 5a and the receiving apparatus 6a share the seed at the time of generating the random sequence by performing the same operation, and can obtain the same subcarrier arrangement information.

The interference measurement units 35a-1 to 35a-M obtain the same subcarrier arrangement information as the transmission device 5a from the random sequence acquired from the random sequence generation unit 40, and the transmission block pattern for sequence "0" and the transmission block pattern for sequence "1" generated by the transmission block pattern generation unit 41. The interference measurement units 35a-1 to 35a-M acquire the positions of null subcarriers, which are null subcarriers for interference measurement, based on the same subcarrier allocation information as the transmission device 5a, and estimate the interference power at the subcarrier positions where the neighboring data blocks are transmitted, based on the reception power values of the null subcarriers (step S78).

Similarly, the time-frequency space decoding unit 36a is a decoding unit that decodes the data block based on the subcarrier arrangement information. The time-frequency space decoding unit 36a performs weighted synthesis of information based on the received signals received by the plurality of antennas 30-1 to 30-M based on the information of the interference power estimated by the interference measurement units 35a-1 to 35a-M, and generates likelihood information for each symbol or each bit unit (step S79). That is, the time-frequency space decoding unit 36a generates likelihood information of each symbol based on the information of the interference power. The subsequent operation of the receiving apparatus 6a, that is, the operation of step S80 in the flowchart of fig. 22 is the same as the operation of step S29 in the flowchart of embodiment 1 shown in fig. 7.

The hardware configurations of the transmission device 5a and the reception device 6a according to embodiment 5 are the same as those of the transmission device 5 and the reception device 6 according to embodiment 1.

As described above, according to the present embodiment, the transmitting device 5a and the receiving device 6a can change the positions of the interference measurement null subcarriers based on the random sequence. In the multi-cell radio communication system 4 shown in fig. 1, when the transmission block pattern is shared between the cells 2, the measurement of the inter-cell 2 interference can be easily performed by changing the random sequence among the cells 2. This enables the transmission device 5a and the reception device 6a to improve transmission characteristics even in a severe radio environment where interference between cells 2 occurs.

In addition, although the present embodiment has been described by taking the configuration corresponding to embodiment 4 as an example, the present invention can also be applied to configurations corresponding to embodiments 2 and 3 in which some functions are not used. In the present embodiment, the case of selecting 2 types of transmission block patterns for the sequence "0" and the sequence "1" has been described, but the transmission block patterns are not limited to 2 types. The signal from the random sequence generator 40 may be multi-valued by being multi-bit bundled, so that any of 4 or 8 transmission block patterns can be selected and arranged.

Embodiment 6.

In embodiment 5 and the like, a transmission block pattern is generated by applying cyclic shift in the time direction. In embodiment 6, a transmission block pattern is generated by applying cyclic shift in the frequency direction.

The configuration of the transmission device 5a according to embodiment 6 is the same as the configuration of the transmission device 5a according to embodiment 5 shown in fig. 17. The configuration of the receiver 6a according to embodiment 6 is the same as that of the receiver 6a according to embodiment 5 shown in fig. 21. Fig. 23 is a diagram showing a configuration example of the transmission block pattern generating unit 41 according to embodiment 6 and an example of the transmission block pattern generated by the transmission block pattern generating unit 41.

The minimum unit block generator 42 generates a minimum unit block having a size of 3 subcarriers × 2OFDM symbols. The pilot mapping unit 43 arranges pilot symbols P1 and P2 for synchronous detection in the frequency direction of the minimum unit block. The additional data block mapping unit 44 adds 3 data blocks (DB3, DB4, DB5) for 2-layer STBC. The cyclic shift unit 45 applies cyclic shift in the frequency direction to the pattern subjected to the additional data block mapping by the additional data block mapping unit 44, and generates a transmission block pattern by combining a plurality of cyclically shifted patterns. In the example of fig. 23, the cyclic shift section 45 combines the patterns of cyclic shift amounts 0, 2, and 5 to generate a transmission block pattern. Thereby, the transmission block pattern generator 41 generates a transmission block pattern of 7 subcarriers × 6OFDM symbols. Note that the same point as embodiment 5 and the like is that division of the minimum unit block is not allowed at the time of cyclic shift.

Specifically, when the operation of embodiment 6 is applied to embodiment 2, the transmission block pattern of embodiment 2 is a 2 nd pattern in which the 1 st pattern is combined with a pattern obtained by cyclically shifting the 1 st pattern in the frequency direction without dividing the minimum unit block.

Similarly, when the operation of embodiment 6 is applied to embodiment 4, the transmission block pattern of embodiment 4 is a 4 th pattern in which the 3 rd pattern and a pattern obtained by cyclically shifting the 3 rd pattern in the time direction or the frequency direction without dividing the minimum unit block are combined.

The hardware configurations of the transmission device 5a and the reception device 6a according to embodiment 6 are the same as those of the transmission device 5 and the reception device 6 according to embodiment 1.

As described above, according to the present embodiment, the transmission device 5a and the reception device 6a generate a transmission block pattern using cyclic shift in the frequency direction. This enables the transmission device 5a and the reception device 6a to further increase the degree of freedom in system design.

The configuration described in the above embodiment is an example of the contents of the present invention, and may be combined with other known techniques, and a part of the configuration may be omitted or modified within a range not departing from the gist of the present invention.

Description of the reference symbols

1-a to 1-c base stations, 2-a to 2-c cells, 3-a to 3-c mobile stations, 4 wireless communication systems, 5a transmitting apparatuses, 6a receiving apparatuses, 11, 38 wireless control sections, 12 error correction coding sections, 13 modulation sections, 14 time-frequency space coding sections, 15a, 15b, 15c, 41 transmitting block pattern generating sections, 16, 42 minimum unit block generating sections, 17, 43 pilot mapping sections, 18, 44 additional data block mapping sections, 19, 45 cyclic shift sections, 20a subcarrier mapping sections, 21-1 to 21-N IFFT sections, 22-1 to 22-N GI additional sections, 23-1 to 23-N, 31-1 to 31-M wireless high frequency sections, 24-1 to 24-N, 30-1 to 30-M antennas, 25-1 to 25-N transmission processing units, 32-1 to 32-M synchronizing units, 33-1 to 33-M GI deleting units, 34-1 to 34-M FFT units, 35-1 to 35-M and 35a-1 to 35a-M interference measuring units, 36 and 36a time-frequency space decoding units, 37 error correcting units and 40 random sequence generating units.