WO2024161654A1 - Dispositif d'émission, dispositif de réception, système de communication, procédé d'émission, procédé de réception, circuit de commande et support de stockage - Google Patents

Dispositif d'émission, dispositif de réception, système de communication, procédé d'émission, procédé de réception, circuit de commande et support de stockage Download PDF

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Publication number
WO2024161654A1
WO2024161654A1 PCT/JP2023/003657 JP2023003657W WO2024161654A1 WO 2024161654 A1 WO2024161654 A1 WO 2024161654A1 JP 2023003657 W JP2023003657 W JP 2023003657W WO 2024161654 A1 WO2024161654 A1 WO 2024161654A1
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coding rule
space
time block
modulated signal
unit
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PCT/JP2023/003657
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English (en)
Japanese (ja)
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歌奈子 山口
昭範 中島
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三菱電機株式会社
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Priority to PCT/JP2023/003657 priority Critical patent/WO2024161654A1/fr
Publication of WO2024161654A1 publication Critical patent/WO2024161654A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits

Definitions

  • This disclosure relates to a transmitting device, a receiving device, a communication system, a transmitting method, a receiving method, a control circuit, and a storage medium that perform transmit diversity transmission.
  • Frequency Shift Keying (FSK) and Phase Shift Keying (PSK) are known modulation methods that have small envelope fluctuations and can achieve excellent power efficiency.
  • FSK Frequency Shift Keying
  • PSK Phase Shift Keying
  • transmit diversity methods have been proposed for wireless communication systems equipped with multiple transmit antennas, such as MISO (Multiple Input and Single Output) systems and MIMO (Multiple Input and Multiple Output) systems.
  • MISO Multiple Input and Single Output
  • MIMO Multiple Input and Multiple Output
  • Non-Patent Document 1 discloses STBC (Space-Time Block Code) technology, which is a space-time block code.
  • STBC technology multiple orthogonal sequences are generated by performing complex conjugation and code inversion on multiple temporally consecutive symbols, and each of the orthogonal sequences is transmitted from a different transmission antenna.
  • the transmission sequence is orthogonally encoded in two dimensions of time and space.
  • the encoding in STBC technology i.e., STBC encoding
  • a receiving device that receives an STBC-encoded transmission signal can easily estimate the transmission bit sequence by decoding the two received symbols using transmission path information.
  • STBC technology can obtain a diversity gain equal to the number of transmission antennas, i.e., a transmission full diversity gain.
  • the present disclosure has been made in consideration of the above, and aims to obtain a transmission device that can suppress the amount of envelope fluctuation even when STBC coding is applied.
  • the transmitting device is characterized by comprising a plurality of transmitting antennas, a modulation unit that generates a modulated signal, a coding rule selection unit that selects a space-time block coding rule according to the value of the modulated signal, and a coding unit that performs space-time block coding on the modulated signal using the selected space-time block coding rule, thereby generating a transmission signal to be transmitted from each of the plurality of transmitting antennas.
  • the transmitting device has the effect of being able to suppress the amount of envelope fluctuation even when STBC coding is applied.
  • FIG. 1 is a diagram showing a configuration example of a communication system according to a first embodiment; A flowchart for explaining an example of a processing procedure of a transmitting device according to a first embodiment.
  • Diagram showing FSK signal in frequency domain A diagram showing a four-level FSK signal in the frequency domain.
  • FIG. 2 is an explanatory diagram of an encoding procedure of the STBC encoding unit;
  • FIG. 2 is an explanatory diagram of a specific example of the encoding procedure of the STBC encoding unit for a 4-value FSK signal;
  • FIG. 1 is a diagram showing an example of the configuration of a control circuit for implementing the functions of a communication system according to a first embodiment;
  • FIG. 13 is a diagram showing a configuration example of a modulation unit according to a second embodiment
  • FIG. 9 is an explanatory diagram of the operation of the spread bit generation unit of the modulation unit shown in FIG. 8.
  • FIG. 9 is an explanatory diagram of the operation of the shift QAM part of the modulation part shown in FIG. 8.
  • Embodiment 1. 1 is a diagram showing an example of a configuration of a communication system 3 according to a first embodiment.
  • the communication system 3 includes a transmitting device 1 and a receiving device 2.
  • the transmitting device 1 has a modulation unit 10, a coding rule selection unit 11, an STBC encoding unit 12, and multiple transmitting antennas 13a and 13b.
  • a modulation unit 10 a coding rule selection unit 11
  • an STBC encoding unit 12 multiple transmitting antennas 13a and 13b.
  • transmitting antennas 13a and 13b when there is no need to distinguish between the transmitting antennas 13a and 13b, they may be simply referred to as transmitting antennas 13.
  • the modulation unit 10 generates a modulated signal by frequency shift keying. Specifically, the modulation unit 10 performs primary modulation on the input transmission bit sequence using the FSK method. That is, the modulation unit 10 maps the transmission bit sequence to an FSK modulated symbol sequence.
  • the transmission bit sequence may be a bit sequence that has been subjected to pre-processing such as interleaving and error correction coding.
  • the modulated signal that has been primarily modulated using the FSK method is also referred to as an FSK signal.
  • the coding rule selection unit 11 selects the STBC coding rule to be used by the STBC encoding unit 12 according to the value of the signal that has been primarily modulated by the modulation unit 10. The detailed method by which the coding rule selection unit 11 selects the STBC coding rule will be described later, but the coding rule selection unit 11 selects one of two STBC coding rules that have different positions of the negative sign according to the carrier frequency of the FSK signal.
  • the STBC coding unit 12 is an example of a coding unit that performs space-time block coding using the STBC coding rule selected by the coding rule selection unit 11 on the signal that has been primarily modulated by the modulation unit 10, thereby generating a transmission signal to be transmitted from each of the multiple transmission antennas 13a, 13b, and outputs each of the multiple generated transmission signals to the corresponding transmission antennas 13a, 13b.
  • Transmitting antennas 13a and 13b radiate the transmission signal output from STBC encoding unit 12 as radio waves.
  • the transmitting device 1 may also add a CP (Cyclic Prefix) to the STBC coding result, or perform post-processing such as spreading.
  • CP Cyclic Prefix
  • CP adding units are provided between the STBC coding unit 12 and each of the transmitting antennas 13a and 13b, as many as the number of transmitting antennas 13, and the STBC coding unit 12 outputs the processed signal to the corresponding CP adding unit.
  • the CP adding unit adds a CP to the signal output from the STBC coding unit 12, and outputs the signal after the CP addition to the corresponding transmitting antenna 13.
  • spreading processing units are provided between the STBC coding unit 12 and each of the transmitting antennas 13a and 13b, as many as the number of transmitting antennas 13.
  • the STBC coding unit 12 outputs the processed signal to the corresponding spreading processing unit.
  • the spreading processing unit multiplies the signal output from the STBC coding unit 12 by a spreading sequence, and outputs the signal after the spreading processing to the corresponding transmitting antenna 13.
  • the transmitting device 1 has two transmitting antennas 13, but the transmitting device 1 may have three or more transmitting antennas 13. That is, the transmitting device 1 only needs to have two or more transmitting antennas 13.
  • the STBC encoding unit 12 When there are three or more transmitting antennas 13, the STBC encoding unit 12 generates transmission signals for the number of transmitting antennas 13, and outputs each of the generated transmission signals to the corresponding transmitting antenna 13.
  • FIG. 1 illustrates components of the transmitting device 1 that are related to baseband signal processing
  • the transmitting device 1 may also include components that are not illustrated in FIG. 1.
  • the transmitting device 1 may also include a filter, an analog section that performs analog signal processing, and the like.
  • Alamouti coding is used as the transmission diversity method, i.e., STBC coding.
  • the STBC coding unit is called a "block”
  • the unit of frequency shift keying i.e., the data unit of FSK modulation
  • An FSK modulated signal is a signal with a frequency that corresponds to the bit value, and is a signal that is sampled at certain time intervals.
  • a “symbol”, which is an FSK modulated signal is a signal with a frequency that corresponds to the bit value, and the time signals that make up a "symbol" are called “samples”.
  • the explanation is based on the assumption that FSK modulation is used as the primary modulation, but the primary modulation method is not limited to FSK modulation and may be a modulation method that transmits information based on the amount of phase rotation between signal points, such as MSK (Minimum Shift Keying) modulation or GMSK (Gaussian MSK) modulation. It is preferable that the primary modulation method be a modulation method with constant envelope.
  • the receiving device 2 has a receiving antenna 20, a coding rule selection unit 21, an STBC decoding unit 22, and a demodulation unit 23.
  • the receiving antenna 20 receives the signal transmitted from the transmitting device 1 as a received signal, and outputs the received signal to the coding rule selection unit 21 and the STBC decoding unit 22.
  • the coding rule selection unit 21 selects the same coding rule as the STBC coding rule used in the transmitting device 1, and outputs the selected STBC coding rule to the STBC decoding unit 22.
  • the transmitting device 1 may notify the receiving device 2 of the STBC coding rule used on the transmitting side by using a pilot signal or the like included in the transmitted signal, or the receiving device 2 may estimate the STBC coding rule used on the transmitting side based on the received signal.
  • the coding rule selection unit 21 may select the STBC coding rule used in the transmitting device 1 by any method.
  • the STBC decoding unit 22 performs STBC decoding on the received signal using the STBC coding rule selected by the coding rule selection unit 21, and outputs the decoded signal to the demodulation unit 23.
  • the demodulation unit 23 performs demodulation, i.e., frequency shift demodulation, corresponding to the FSK method, which is the primary modulation, on the decoded signal that is the result of decoding by the STBC decoding unit 22, to obtain an estimated bit sequence that is an estimation result of the transmitted bit sequence.
  • demodulation i.e., frequency shift demodulation, corresponding to the FSK method, which is the primary modulation
  • the receiving device 2 performs decoding processing corresponding to the pre-processing such as deinterleaving and error correction decoding on the demodulation result by the demodulation unit 23. If soft decision error correction decoding is performed on the demodulation result by the demodulation unit 23, the demodulation unit 23 may obtain a soft decision value. If the transmitting device 1 has added a CP, the receiving device 2 has a CP removal unit that removes the CP after the receiving antenna 20, and the received signal after the CP removal unit removes the CP is output to the coding rule selection unit 21 and the STBC decoding unit 22.
  • FIG. 1 shows an example in which there is one receiving antenna 20, there may be multiple receiving antennas 20.
  • the coding rule selection unit 21 or a receiving diversity decoding unit (not shown) provided in front of the coding rule selection unit 21 combines multiple received signals received by the multiple receiving antennas 20, and the STBC decoding unit 22 performs STBC decoding on the combined received signal.
  • FIG. 1 illustrates components of the receiving device 2 related to baseband signal processing
  • the receiving device 2 may include components not illustrated in FIG. 1.
  • the receiving device 2 also performs time synchronization processing, frequency synchronization processing, transmission channel estimation, etc., but since these processes can be general processes, illustration and description of the functional units that perform these processes are omitted.
  • the time synchronization processing, frequency synchronization processing, transmission channel estimation processing, etc. are performed ideally. If the time synchronization processing, frequency synchronization processing, transmission channel estimation processing, etc. are not performed ideally, errors may occur, but the method of dealing with errors is the same as that of a receiving device that performs general STBC decoding, so description will be omitted here.
  • Figure 2 is a flowchart for explaining an example of the processing procedure of the transmission device 1 according to the first embodiment.
  • the modulation unit 10 of the transmitting device 1 generates an FSK signal by performing FSK modulation on the input transmission bit sequence (step S101).
  • the modulation unit 10 outputs the generated FSK signal to the coding rule selection unit 11 and the STBC encoding unit 12.
  • the coding rule selection unit 11 selects an STBC coding rule based on the FSK signal output by the modulation unit 10 (step S102).
  • the coding rule selection unit 11 outputs the selected STBC coding rule to the STBC encoding unit 12.
  • the STBC encoding unit 12 generates an STBC-encoded signal by performing STBC encoding on samples in the symbols of the FSK signal output by the modulation unit 10 using the STBC encoding rule selected by the coding rule selection unit 11.
  • the STBC encoding unit 12 generates a transmission signal by dividing the STBC-encoded signal into signals corresponding to each of the transmitting antennas 13a and 13b (step S103).
  • the STBC encoding unit 12 outputs each of the generated transmission signals to the corresponding transmitting antennas 13a and 13b.
  • An FSK signal has the advantage of having little envelope fluctuation, but when STBC coding is performed between symbols, the amplitude value periodically drops to 0 at the symbol boundaries due to the code inversion process being performed on temporally consecutive symbols. This causes the envelope of the transmission signal to fluctuate.
  • STBC coding is performed within the symbols of the FSK signal based on the carrier frequency of the FSK signal so as to reduce the impact of the code inversion process on temporally consecutive symbols while maintaining the spatio-temporal orthogonality in STBC coding. Details of the method of selecting the STBC coding rule and the STBC coding process within a symbol will be described later.
  • the transmitting antennas 13a and 13b transmit the transmission signal output from the STBC encoding unit 12 as radio waves to the receiving device 2 (step S104).
  • the coding rule selection unit 11 selects one of a plurality of STBC coding rules with different positions of the negative sign based on the frequency carrier of the FSK signal output from the modulation unit 10.
  • FIG. 3 is a diagram showing an FSK signal in the frequency domain.
  • FIG. 3 shows an FSK signal in the frequency domain having M frequency carriers output from the modulation unit 10.
  • the coding rule selection unit 11 selects an STBC coding rule based on the value of the input FSK signal so that different STBC coding rules are applied to adjacent FSK carriers in the frequency domain for the M FSK carriers.
  • Figure 4 shows a four-level FSK signal in the frequency domain.
  • the modulation unit 10 selects a frequency corresponding to the transmission bit sequence to generate an FSK signal.
  • the coding rule selection unit 11 selects coding rule #1 when the frequency of the FSK signal is f1 or -f2, and selects coding rule #2 when the frequency of the FSK signal is f2 or -f1, so that different STBC coding rules are selected between adjacent FSK carriers.
  • coding rule #1 is expressed by the following formula (1).
  • x (k) t represents a transmission signal transmitted from the kth transmission antenna 13 as the tth signal in the STBC block.
  • zt represents the tth FSK signal in the FSK signal to be STBC encoded.
  • k and t are natural numbers.
  • the transmission antenna 13a is the first transmission antenna 13
  • the transmission antenna 13b is the second transmission antenna 13. * represents a complex conjugate.
  • code rule #2 is expressed by the following formula (2). Code rule #2 differs from code rule #1 in the position of the negative sign.
  • the STBC encoding unit 12 performs STBC encoding within the FSK symbol of the FSK signal output from the modulation unit 10 using the STBC encoding rule selected by the encoding rule selection unit 11.
  • the STBC encoding unit 12 performs STBC encoding using the STBC encoding rule selected by the encoding rule selection unit 11 using a combination of FSK samples separated by (M/2-1) samples within the same FSK symbol, with the 0th to (M/2-1)th FSK samples being z 0 in Equation (1) and Equation (2) and the M/2th to (M-1)th FSK samples being z 1 in Equation (1) and Equation (2) of the FSK signal of one symbol consisting of M samples.
  • the combination of FSK samples separated by (M/2-1) samples refers to a combination in which (M/2-1) FSK samples are sandwiched between two FSK samples.
  • Fig. 6 is an explanatory diagram of a specific example of the encoding procedure of the STBC encoding unit 12 for a four-value FSK signal.
  • Fig. 6 shows a case where the FSK symbol consisting of four samples generated by the modulation unit 10 has an FSK signal frequency of f1 for the 0th symbol, i.e., an information bit sequence of "00", and an FSK signal frequency of f2 for the 1st symbol, i.e., an information bit sequence of "01".
  • the coding rule selection unit 11 selects coding rule #1 for the 0th symbol and coding rule #2 for the 1st symbol.
  • the STBC encoding unit 12 first generates an STBC-coded signal using coding rule #1 shown in formula (1) by setting the FSK signal of the 0th sample of the 0th symbol to z0 and the FSK signal of the 2nd sample to z1 , and sets the 0th sample of the 0th symbol of the STBC-coded signal to x (k) 0 and the 2nd sample to x (k) 1 .
  • an STBC coded signal is generated using coding rule #1 shown in equation (1) with the FSK signal of the first sample of the 0th symbol as z0 and the FSK signal of the third sample as z1 , and the first sample of the 0th symbol of the STBC coded signal is set as x (k) 0 and the third sample as x (k) 1 .
  • the first symbol of the STBC coded signal is generated in the same manner as the 0th symbol using coding rule #2.
  • FIG. 6 shows the transmission signals TX1 and TX2 after STBC encoding.
  • FIG. 6 also shows signal point transitions in transmission signal TX2.
  • the numbers in [ ] in the figure indicate the order of samples in each FSK symbol; for example, [0] indicates the 0th sample.
  • the signal point transitions in transmitting antenna 13b are continuous within and between FSK symbols, and it can be confirmed that the increase in envelope fluctuation due to STBC encoding has been suppressed.
  • the coding rule selection unit 11 selects an STBC coding rule in which the position of the negative sign differs between adjacent FSK carriers, in accordance with the frequency of the FSK signal output from the modulation unit 10, thereby suppressing an increase in the amount of envelope fluctuation between FSK symbols. Furthermore, the STBC encoding unit 12 uses the selected STBC coding rule to perform STBC encoding using a combination of the 0th to (M/2-1)th sample and the M/2 to M-1th sample of the FSK signal, thereby suppressing an increase in the amount of envelope fluctuation within the FSK symbol.
  • the code rule selection unit 11 selects code rule #1 expressed by formula (1) when the frequency of the FSK signal output from the modulation unit 10 is f1, i.e., the transmission bit sequence is "00", and when the frequency of the FSK signal is -f2, i.e., the transmission bit sequence is "10", and selects code rule #2 expressed by formula (2) when the frequency of the FSK signal is f2, i.e., the transmission bit sequence is "01", and when the frequency of the FSK signal is -f1, i.e., the transmission bit sequence is "11".
  • the assignment of code rules may be reversed.
  • the coding rule selection unit 11 may select coding rule #2 expressed by formula (2) when the frequency of the FSK signal output from the modulation unit 10 is f1, i.e., the transmission bit sequence is "00", and when the frequency of the FSK signal is -f2, i.e., the transmission bit sequence is "10”, and may select coding rule #1 expressed by formula (1) when the frequency of the FSK signal is f2, i.e., the transmission bit sequence is "01", and when the frequency of the FSK signal is -f1, i.e., the transmission bit sequence is "11".
  • the STBC coding rule selected by the coding rule selection unit 11 may be other than the STBC coding rules expressed by formulas (1) and (2), and may select a combination of STBC coding rules such that the STBC-coded signal at each transmitting antenna 13 is phase continuous within and between symbols.
  • the STBC encoding unit 12 can perform STBC encoding using the FSK signal from 0 to (ML/2-1) samples and from ML/2 to ML-1 samples to achieve the same effect.
  • the transmitting device 1 includes a plurality of transmitting antennas 13a and 13b, a modulating unit 10 that generates a modulated signal, a coding rule selecting unit 11 that selects a space-time block coding rule according to the value of the modulated signal, and an STBC coding unit 12 that is a coding unit that performs space-time block coding on the modulated signal using the selected space-time block coding rule to generate a transmission signal to be transmitted from each of the plurality of transmitting antennas 13a and 13b.
  • the modulating unit 10 can generate an FSK signal as a modulated signal by performing modulation using the FSK method.
  • the coding rule selecting unit 11 can select an STBC coding rule based on the value of the frequency carrier of the modulated signal modulated by the FSK method. More specifically, the coding rule selecting unit 11 selects an STBC coding rule based on the value of the modulated signal so that different STBC coding rules are applied to adjacent frequency carriers in the frequency domain in the frequency carrier of the modulated signal that has been primarily modulated using the FSK method. At this time, the coding rule selection unit 11 selects the STBC coding rule so that STBC coding rules with different negative sign positions are applied to adjacent frequency carriers in the frequency domain.
  • the STBC encoding unit 12 performs STBC coding within the FSK symbol using the selected STBC coding rule, so that even when STBC coding is applied to a signal that has been primarily modulated by the FSK method, it is possible to suppress an increase in the envelope fluctuation amount of the transmission signal compared to conventional STBC coding.
  • the above configuration can achieve an envelope fluctuation amount equivalent to that of an FSK signal at the time of one branch before STBC coding. Therefore, in this embodiment, it is possible to prevent a decrease in power efficiency in any of the transmission antennas 13 compared to conventional STBC coding.
  • the processing in the STBC encoding unit 12 maintains the time-space orthogonality between the transmission antennas 13 as in conventional STBC coding, so it is possible to prevent a decrease in transmission diversity gain.
  • the STBC coding is described on the assumption that Alamouti coding is used.
  • the STBC coding unit 12 may use STBC coding other than Alamouti coding.
  • the coding method used by the STBC coding unit 12 may be any method that performs coding by complex conjugation and sign inversion of a signal.
  • the functions of the modulation unit 10, the coding rule selection unit 11, the STBC encoding unit 12, the coding rule selection unit 21, the STBC decoding unit 22, and the demodulation unit 23 are realized by a processing circuit, which is an electronic circuit.
  • This processing circuit may be dedicated hardware, or it may be a control circuit equipped with a memory and a CPU (Central Processing Unit) that executes the programs stored in the memory.
  • a CPU Central Processing Unit
  • the processing circuitry may be 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 of these.
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • the control circuit is, for example, a control circuit 300 shown in FIG. 7.
  • FIG. 7 is a diagram showing an example of the configuration of a control circuit 300 for realizing the functions of the communication system 3 according to the first embodiment.
  • the control circuit 300 has a processor 300a and a memory 300b.
  • the processor 300a can realize the functions of the communication system 3 by reading and executing the programs corresponding to each process stored in the memory 300b.
  • the processor 300a is a CPU, and is also called an arithmetic unit, a microprocessor, a microcomputer, a DSP (Digital Signal Processor), etc.
  • Memory 300b is, for example, a non-volatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), EEPROM (registered trademark) (Electrically EPROM), a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD (Digital Versatile Disk), etc. Memory 300b is also used as a temporary memory for each process executed by processor 300a.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • flash memory EPROM (Erasable Programmable ROM), EEPROM (registered trademark) (Electrically EPROM), a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD (Digital Versatile Disk), etc.
  • Memory 300b is also used as a temporary memory for each process executed by processor 300a.
  • the functions of the modulation unit 10, coding rule selection unit 11, and STBC encoding unit 12 of the transmitting device 1 may be realized by different processing circuits, or the functions of the modulation unit 10, coding rule selection unit 11, and STBC encoding unit 12 may be realized together by one processing circuit.
  • each function of the transmitting device 1 and the receiving device 2 may be realized by combining dedicated hardware and a CPU.
  • the division of the functional units of the transmitting device 1 and the receiving device 2 is one example, and a component described as a single functional unit may be realized using multiple processing circuits.
  • Embodiment 2. 8 is a diagram showing a configuration example of a modulation unit 10a according to the second embodiment.
  • the transmission device 1a (not shown) according to the second embodiment is similar to the transmission device 1 according to the first embodiment, except that it has a modulation unit 10a instead of the modulation unit 10.
  • the parts different from the first embodiment will be mainly described, and the description of the parts similar to the first embodiment will be omitted.
  • the modulation unit 10 shown in FIG. 1 uses a modulation method that transmits information based on the amount of phase rotation between samples, such as FSK modulation, as the primary modulation of the transmission bit sequence.
  • the modulation unit 10a spreads the transmission bit sequence and modulates the spread bit sequence using a shifted QAM method of the ⁇ /4 shift QAM (Quadrature Amplitude Modulation) method, thereby achieving the same effect as in the first embodiment.
  • the amount of envelope fluctuation is kept constant by spreading the modulation method that transmits information based on the phase of each sample point, and the same effect as in the first embodiment can be achieved.
  • the modulation unit 10a has a spread bit generation unit 100 and a shift QAM unit 101.
  • the spreading bit generation unit 100 generates a spreading bit sequence from the input transmission bit sequence. Specifically, the spreading bit generation unit 100 generates a spreading bit sequence consisting of N samples based on a specified spreading factor N and the modulation method used by the shift QAM unit 101. The spreading bit generation unit 100 outputs the generated spreading bit sequence to the shift QAM unit 101.
  • the shift QAM unit 101 performs primary modulation on the spread bit sequence of N samples output by the spread bit generation unit 100 using a shift QAM method corresponding to the spreading factor N, and generates a modulated signal including the mapped modulated symbol sequence.
  • the shift QAM unit 101 outputs the generated modulated signal to each of the coding rule selection unit 11 and the STBC encoding unit 12.
  • the modulation unit 10a is not limited to this example, and the spreading factor N may be other than 4, and the modulation method used by the shift QAM unit 101 may be a modulation method other than the ⁇ /4 shift QPSK method.
  • the modulation unit 10a may set the spreading factor N of the spreading bit generation unit 100 to 4, and the modulation method used by the shift QAM unit 101 to the ⁇ /4 shift DQPSK (Differential QPSK) method.
  • the modulation unit 10a may set the spreading factor N of the spreading bit generation unit 100 to 2, and the modulation method used by the shift QAM unit 101 to the ⁇ /2 shift BPSK (Binary Phase Shift Keying) method.
  • FIG. 9 is an explanatory diagram of the operation of the spread bit generating unit 100 of the modulation unit 10a shown in FIG. 8.
  • FIG. 9 shows an example in which the spreading factor N of the spread bit generating unit 100 is 4, and the modulation method used by the shift QAM unit 101 is the ⁇ /4 shift QPSK method.
  • the spread bit generating unit 100 generates a spread bit sequence of four samples of "00", "00", "01", and "01", and outputs it to the shift QAM unit 101.
  • the spread bit generating unit 100 when the transmission bit sequence is "01”, the spread bit generating unit 100 generates a spread bit sequence of four samples of "00", “01”, “10”, and “00”, when the transmission bit sequence is “10”, the spread bit generating unit 100 generates a spread bit sequence of four samples of "00”, “11”, “01”, and “10”, when the transmission bit sequence is “11”, and generates a spread bit sequence of four samples of "00", "10", “10”, and “11” when the transmission bit sequence is “11”. Furthermore, for odd-numbered symbols, when the transmission bit sequence is "00", the spread bit generator 100 generates a spread bit sequence of four samples, "11", “11”, “10”, and “10”, and outputs it to the shift QAM unit 101.
  • the spread bit generator 100 when the transmission bit sequence is "01", the spread bit generator 100 generates a spread bit sequence of four samples, "11”, “10”, “01”, and “11”, when the transmission bit sequence is “10”, generates a spread bit sequence of four samples, “11”, “00”, “10”, and “01”, when the transmission bit sequence is “11”, generates a spread bit sequence of four samples, "11”, "01”, “01”, and "00”, when the transmission bit sequence is "11".
  • FIG 10 is an explanatory diagram of the operation of the shift QAM unit 101 of the modulation unit 10a shown in Figure 8.
  • the shift QAM unit 101 maps the 4-sample spread bit sequence output by the spread bit generation unit 100 using a ⁇ /4 shift QPSK method in which the mapping point shifts by ⁇ /4 for each sample, generating a modulated signal.
  • the shift QAM unit 101 maps to a phase of "0" when the spread bit sequence value is "00", to a phase of " ⁇ /2” when the spread bit sequence value is "01”, to a phase of "- ⁇ /2” when the spread bit sequence value is "10”, and to a phase of " ⁇ " when the spread bit sequence value is "11".
  • the shift QAM unit 101 maps each sample to a phase of " ⁇ /4" when the spreading bit sequence value is "00", to a phase of "3 ⁇ /4” when the spreading bit sequence value is “01”, to a phase of "- ⁇ /4” when the spreading bit sequence value is “10”, and to a phase of "-3 ⁇ /4" when the spreading bit sequence value is "11".
  • the coding rule selection unit 11 selects coding rule #1 expressed by the above formula (1), and when the N/2th sample of the modulated signal is a signal point corresponding to a phase of - ⁇ /2, the coding rule selection unit 11 selects coding rule #2 expressed by the above formula (2).
  • the shift QAM unit 101 maps signal points onto the I/Q axis for even samples, but may map signal points onto the I/Q axis for odd samples.
  • the code rule selection unit 11 selects code rule #1 expressed by the above formula (1) when the N/2-th sample of the modulated signal is a signal point corresponding to a phase of 3 ⁇ /4, and selects code rule #2 expressed by the above formula (2) when the N/2-th sample of the modulated signal is a signal point corresponding to a phase of -3 ⁇ /4.
  • the correspondence between the code rule and the modulated signal value may be reversed.
  • the coding rule selection unit 11 uses coding rule #1 when the N/2-th sample of the modulated signal is a signal point corresponding to a phase of ⁇ /2, and coding rule #2 when the N/2-th sample of the modulated signal is a signal point corresponding to a phase of - ⁇ /2.
  • coding rule #2 when the N/2-th sample of the modulated signal is a signal point corresponding to a phase of ⁇ /2.
  • the STBC encoding unit 12 of the transmitting device 1a performs STBC encoding on the modulated signal output from the modulation unit 10a using the STBC encoding rule selected by the coding rule selection unit 11. Note that the operation of STBC encoding in the STBC encoding unit 12 is the same as in the first embodiment, and performs STBC encoding using a combination of the 0th to (N/2-1)th samples and the N/2th to (N-1)th samples of the modulation symbol composed of N samples.
  • the transmitting device 1a As described above, the transmitting device 1a according to the second embodiment generates a spread bit sequence, performs shift QAM modulation on the generated spread bit sequence, and selects an STBC coding rule according to the value of the shift QAM modulated symbol, thereby achieving the same effect as that of the first embodiment.
  • the configuration and operation of the receiving side in the second embodiment are the same as those of the receiving device 2 according to the first embodiment, and therefore will not be described here.
  • the modulation unit 10a of the transmission device 1a according to the second embodiment has a spreading bit generation unit 100 that generates a spreading bit sequence from an input transmission bit sequence, and a shift QAM unit 101 that generates a modulated signal from the spreading bit sequence by the shift QAM modulation method.
  • the modulated signal is composed of n samples from 0th to N-1th.
  • the coding rule selection unit 11 selects the STBC coding rule based on the value of the N/2th sample of the modulated signal.
  • the spreading bit generation unit 100 generates a spreading bit sequence from the transmission bit sequence based on the modulation method used by the shift QAM unit 101 and a predetermined spreading factor N.
  • the increase in the envelope fluctuation amount of the transmission signal can be suppressed, as in the transmission device 1 according to the first embodiment.
  • the hardware configuration of the transmission device 1a is also similar to that of the transmission device 1 according to the first embodiment, so a description thereof will be omitted here.
  • coding rules #1 and #2 shown above in formula (1) and formula (2) are also just examples, and are not limited to those shown in formula (1) and formula (2) if, for example, the position of the negative sign is different between coding rules #1 and #2.
  • 1, 1a transmitter, 2 receiver, 3 communication system 10, 10a modulator, 11, 21 code rule selector, 12 STBC encoder, 13, 13a, 13b transmitter antenna, 20 receiver antenna, 22 STBC decoder, 23 demodulator, 100 spread bit generator, 101 shift QAM unit, 300 control circuit, 300a processor, 300b memory.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

Un dispositif d'émission (1) comprend : une pluralité d'antennes d'émission (13a, 13b) ; une unité de modulation (10) qui génère un signal de modulation ; une unité de sélection de règle de codage (11) qui sélectionne une règle de codage spatio-temporel par blocs en correspondance avec la valeur du signal de modulation (11) ; et une unité de codage STBC (12), qui est une unité de codage qui effectue un codage spatio-temporel par blocs sur le signal de modulation en utilisant la règle de codage spatio-temporel sélectionnée, générant ainsi des signaux d'émission respectivement émis par la pluralité d'antennes d'émission (13a, 13b).
PCT/JP2023/003657 2023-02-03 2023-02-03 Dispositif d'émission, dispositif de réception, système de communication, procédé d'émission, procédé de réception, circuit de commande et support de stockage WO2024161654A1 (fr)

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US20060036922A1 (en) * 2004-08-16 2006-02-16 Samsung Electronics Co., Ltd. Apparatus and method for changing signal mapping rule in a hybrid automatic repeat request system
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US20060036922A1 (en) * 2004-08-16 2006-02-16 Samsung Electronics Co., Ltd. Apparatus and method for changing signal mapping rule in a hybrid automatic repeat request system
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