WO2022172327A1 - 送信装置、受信装置、通信システム、制御回路、記憶媒体、送信方法および受信方法 - Google Patents
送信装置、受信装置、通信システム、制御回路、記憶媒体、送信方法および受信方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
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- 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
- H04L27/14—Demodulator circuits; Receiver circuits
- H04L27/144—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B2001/6912—Spread spectrum techniques using chirp
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Definitions
- the present disclosure relates to a transmitting device, a receiving device, a communication system, a control circuit, a storage medium, a transmitting method, and a receiving method that perform wireless communication.
- Frequency shift modulation (hereinafter referred to as FSK (Frequency Shift Keying)) is a modulation method that changes the frequency of the carrier wave according to the information to be transmitted.
- FSK Frequency Shift Keying
- the envelope amplitude of the modulated signal is constant, and the input backoff value can be set small in the power amplifier. It is known to have extremely high power efficiency compared to QAM (Quadrature Amplitude Modulation).
- QAM Quadrature Amplitude Modulation
- FSK has lower spectral efficiency than PSK, QAM, and the like.
- Non-Patent Document 1 discloses an asynchronous detection technique that calculates the power of each FSK candidate channel and demodulates the largest of them as an estimated transmission signal.
- LPWA Low Power Wide Area
- Most of the standards belonging to LPWA apply spectrum spreading to the narrowband primary modulated signal and transmit the signal as a wideband secondary modulated signal, thereby ensuring highly reliable information transmission even in long-distance communication with large propagation loss. is realized.
- LoRaWAN Long Range Wide Area Network
- the delayed wave power of the multipath becomes an FSK candidate during FSK demodulation. It can leak into the carrier and result in demodulation errors.
- the number of delayed samples of the delayed wave with respect to the preceding wave in multipath is an integral multiple of the FSK carrier interval, the delayed wave power appears in the FSK candidate carrier.
- An object of the present invention is to obtain a transmitting apparatus that transmits a signal that can obtain a diversity effect due to multipath without using a pilot signal.
- the present disclosure is a transmitting device that performs wireless communication with a receiving device.
- the transmitting apparatus includes a modulation section that performs frequency shift modulation on an input information bit string to generate frequency shift modulation symbols, a direct spreading section that directly spreads the frequency shift modulation symbols using a chirp sequence, and a receiving apparatus.
- a transmitting apparatus avoids demodulation errors caused by multipaths and multipaths without using a pilot signal in a receiving apparatus of a wireless communication system that applies asynchronous detection to frequency shift modulation with chirp spreading. It is possible to transmit a signal capable of obtaining a diversity effect due to paths.
- a diagram showing a configuration example of a communication system according to Embodiment 1 1 is a block diagram showing a configuration example of a transmission device according to Embodiment 1;
- FIG. Flowchart showing the operation of the transmission device according to Embodiment 1 1 is a block diagram showing a configuration example of a receiver according to Embodiment 1 Flowchart showing the operation of the receiving device according to Embodiment 1
- FIG. 3 is a diagram showing a configuration example of a processing circuit provided in the transmission device according to Embodiment 1 when the processing circuit is realized by a processor and a memory;
- FIG. 4 is a diagram showing an example of a processing circuit when the processing circuit included in the transmitting apparatus according to Embodiment 1 is configured with dedicated hardware; Block diagram showing a configuration example of a transmission device according to Embodiment 2 Flowchart showing operation of a transmitting device according to Embodiment 2
- FIG. 1 is a diagram showing a configuration example of a communication system 1 according to Embodiment 1.
- a communication system 1 includes a transmitting device 10 and a receiving device 20 .
- the communication system 1 is a radio communication system in which a transmitting device 10 transmits a radio signal and a receiving device 20 receives the radio signal to perform radio communication.
- FIG. 2 is a block diagram showing a configuration example of the transmission device 10 according to Embodiment 1.
- the transmitting apparatus 10 includes an FSK carrier interval control section 11, an FSK modulation section 12, a direct spreading section 13, and a transmission antenna .
- FIG. 3 is a flow chart showing the operation of the transmitting device 10 according to the first embodiment.
- the FSK carrier interval control unit 11 determines carrier intervals of FSK symbols generated by the FSK modulation unit 12 (step S11).
- the FSK carrier interval controller 11 outputs the determined FSK symbol carrier interval to the FSK modulator 12 .
- the FSK modulation unit 12 performs FSK modulation on the input information bit string based on the FSK symbol carrier interval determined by the FSK carrier interval control unit 11 (step S12). Specifically, the FSK modulation unit 12 performs FSK modulation based on the carrier interval K i of the i-th FSK symbol determined by the FSK carrier interval control unit 11, and as shown in equation (1), M-ary FSK Generate a signal, or FSK symbol.
- m i is a symbol number generated from the i-th information bit string input to FSK modulation section 12, and is in the range of 0 ⁇ m i ⁇ M ⁇ 1.
- N is the direct spreading length by the chirp sequence. That is, M FSK symbols are arranged every K i subcarriers from the 0th subcarrier among all N subcarriers on the frequency axis.
- the FSK carrier interval control unit 11 controls the carrier interval K i to change for each symbol . Make them prime to each other.
- the FSK modulating section 12 may be simply referred to as a modulating section.
- the direct spreading unit 13 applies direct spreading using a chirp sequence to the FSK symbols generated by the FSK modulation unit 12 (step S13).
- a chirp sequence used in the direct spreading section 13 is expressed as in Equation (2).
- Equation (2) q represents the chirp sequence number. In this embodiment, chirp sequences with the same value of q are used for all FSK symbols.
- a signal after direct spreading by the direct spreading section 13 is expressed as in Equation (3).
- the transmitting antenna 14 transmits the signal xn directly spread by the direct spreading section 13 to the receiving device 20 (step S14).
- FSK carrier interval control section 11 prevents multipath delayed wave components from appearing in FSK candidate carriers in one of two consecutive symbols in the frequency spectrum of the signal after despreading in receiving apparatus 20. It is a control unit that controls a signal to be transmitted to the receiving device 20 as shown in FIG. Specifically, the FSK carrier interval control unit 11 changes the carrier interval K i of the FSK symbols for each symbol so that the carrier intervals K i of the FSK symbols selected between two consecutive symbols are relatively prime.
- FIG. 4 is a block diagram showing a configuration example of the receiving device 20 according to Embodiment 1.
- the receiving device 20 includes a receiving antenna 21 , a despreading section 22 , a Fourier transforming section 23 , a power calculating section 24 , a metric synthesizing section 25 , an FSK demodulating section 26 and a delayed wave detecting section 27 .
- FIG. 5 is a flow chart showing the operation of the receiver 20 according to the first embodiment. It is assumed that the receiving device 20 performs the processing described below for each received symbol.
- the receiving antenna 21 receives the signal rn transmitted from the transmitting device 10 (step S21).
- the despreading unit 22 despreads the signal rn received by the receiving antenna 21 as shown in Equation (4) (step S22).
- s n cannot be represented by adding ⁇ above it, so in the following description, s n with ⁇ above it will be referred to as s n (hat).
- the Fourier transform unit 23 performs a Fourier transform of length N on the signal s n (hat) despread by the despreading unit 22 (step S23). Thereby, the Fourier transform unit 23 transforms the despread signal s n (hat) into a signal on the frequency axis to generate a frequency signal.
- the power calculation unit 24 calculates the power of each subcarrier in the frequency signal converted by the Fourier transform unit 23 (step S24).
- the power calculator 24 uses the power of subcarriers that are candidate points for FSK candidate carriers among the calculated powers of the subcarriers as metrics for the corresponding FSK candidate symbols. It is assumed that the carrier interval K i of each transmission symbol determined by the FSK carrier interval control section 11 of the transmitting device 10 is known to the receiving device 20 .
- the metric combiner 25 Based on the number of delayed samples of the delayed wave estimated up to the symbol immediately preceding the received symbol, the metric combiner 25 corresponds the power of the subcarrier cyclically shifted forward by the number of delayed samples from the candidate point of each FSK candidate carrier. Add to the metric of the FSK candidate symbol to be used. That is, the metric synthesizer 25 synthesizes metrics (step S25).
- the metric of the FSK symbol corresponding to the m i -th subcarrier is expressed as in Equation (5).
- Equation (5) L is the estimated total number of delayed waves.
- ⁇ l is the number of delayed samples of the l-th delayed wave.
- P(k) is the power of the k-th subcarrier calculated by the power calculator 24 .
- Equation (5) expresses metric combining based on the maximum ratio combining rule, but the method of metric combining in the metric combining unit 25 is not limited to this.
- the metric synthesizing unit 25 may perform metric synthesizing based on a selective synthesizing criterion as expressed by Equation (6).
- the FSK demodulator 26 makes a hard decision on the metric after combining the FSK candidate symbols calculated above, and estimates the FSK signal transmitted from the transmitter 10 . That is, the FSK demodulator 26 performs FSK demodulation by hard decision (step S26).
- the hard decision result by the FSK demodulator 26 is used in the delayed wave detector 27 in the subsequent stage, and does not necessarily need to be used as the final demodulation result.
- the receiving device 20 outputs the metric output from the metric synthesizing unit 25 to a channel decoder (not shown) connected to the subsequent stage of the receiving device 20, and outputs the metric to the channel decoder.
- the FSK demodulator 26 may be simply called a demodulator.
- the delayed wave detector 27 detects subcarriers where the delayed wave power is located from the frequency signal, and detects the position of the subcarrier of the detected delayed wave power and the subcarrier corresponding to the estimated FSK signal obtained from the preceding FSK demodulator 26. From the difference from the carrier position, the number of delayed samples ⁇ l of the delayed wave is estimated (step S27). The delayed wave detector 27 outputs the estimated number of delayed samples ⁇ l to the metric synthesizer 25 . The metric synthesizing unit 25 uses the number of delayed samples ⁇ l obtained from the delayed wave detecting unit 27 when calculating the metric for the next symbol. Various techniques are conceivable as methods for estimating subcarriers in which delayed waves are located in the delayed wave detector 27 .
- estimation by threshold determination using the statistical properties of noise for example, a method of detecting a delayed wave by distinguishing between noise and delayed wave components based on average power, etc.
- the method of detecting delayed waves in is not limited to this.
- the number of delayed samples ⁇ l of the delayed wave output from the delayed wave detection unit 27 to the metric synthesis unit 25 only the value estimated from the current symbol may be used. You can also use a more accurate value by averaging the estimated values. That is, the delayed wave detection unit 27 metric-combines the average value of the number of delayed samples ⁇ l of the delayed wave estimated in the immediately preceding symbol or the number of delayed samples ⁇ l of a plurality of delayed waves estimated in the plurality of immediately preceding symbols. You may output to the part 25.
- the transmitting antenna 14 is an antenna element.
- the FSK carrier interval control section 11, the FSK modulation section 12, and the direct spreading section 13 are realized by processing circuits.
- the processing circuitry may be a processor and memory executing programs stored in the memory, or may be dedicated hardware. Processing circuitry is also called control circuitry.
- FIG. 6 is a diagram showing a configuration example of the processing circuit 90 when the processing circuit included in the transmission device 10 according to Embodiment 1 is implemented by the processor 91 and the memory 92.
- a processing circuit 90 shown in FIG. 6 is a control circuit and includes a processor 91 and a memory 92 .
- each function of the processing circuit 90 is implemented by software, firmware, or a combination of software and firmware.
- Software or firmware is written as a program and stored in memory 92 .
- each function is realized by the processor 91 reading and executing the program stored in the memory 92.
- the processing circuitry 90 includes a memory 92 for storing programs that result in the processing of the transmitting device 10 being executed.
- This program can also be said to be a program for causing the transmitting device 10 to execute each function realized by the processing circuit 90 .
- This program may be provided by a storage medium storing the program, or may be provided by other means such as a communication medium.
- the FSK modulation unit 12 performs frequency shift modulation on the input information bit string to generate frequency shift modulation symbols
- the direct spreading unit 13 performs A second step of performing direct spreading using a chirp sequence
- FSK carrier interval control section 11 detects multipath delayed wave components in one of two consecutive symbols in the frequency spectrum of the signal after despreading in receiving apparatus 20.
- the program is a program for causing the transmitting device 10 to execute the third step of controlling the signal to be transmitted to the receiving device 20 so that .
- the processor 91 is, for example, a CPU (Central Processing Unit), a processing device, an arithmetic device, a microprocessor, a microcomputer, or a DSP (Digital Signal Processor).
- the memory 92 is a non-volatile or volatile memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), EEPROM (registered trademark) (Electrically EPROM), etc.
- RAM Random Access Memory
- ROM Read Only Memory
- flash memory EPROM (Erasable Programmable ROM), EEPROM (registered trademark) (Electrically EPROM), etc.
- a semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc) is applicable.
- FIG. 7 is a diagram showing an example of the processing circuit 93 when the processing circuit included in the transmission device 10 according to Embodiment 1 is configured with dedicated hardware.
- the processing circuit 93 shown in FIG. 7 is, 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 of these thing applies.
- the processing circuit may be partly implemented by dedicated hardware and partly implemented by software or firmware.
- the processing circuitry may implement each of the functions described above through dedicated hardware, software, firmware, or a combination thereof.
- the hardware configuration of the transmitting device 10 has been described, the hardware configuration of the receiving device 20 is the same.
- the receiving antenna 21 is an antenna element.
- the despreading unit 22, the Fourier transform unit 23, the power calculation unit 24, the metric synthesis unit 25, the FSK demodulation unit 26, and the delayed wave detection unit 27 are implemented by processing circuits.
- the processing circuitry may be a processor and memory that executes a program stored in memory, or may be dedicated hardware.
- transmitting apparatus 10 utilizes the fact that an FSK-modulated narrowband signal is spectrum-spread into a wideband signal by direct spreading. The spacing of carriers corresponding to symbols is changed for each transmitted symbol. As a result, the transmitting apparatus 10 can avoid the case where the delayed wave component appears in the FSK candidate carrier, which cannot be demodulated in the conventional asynchronous detection in the receiving apparatus 20, from occurring continuously between transmission symbols. It becomes possible. In other words, as long as the communication path is coherent, the transmitting apparatus 10 can avoid the case where one of two consecutive symbols always has a delayed wave component appearing in the FSK candidate carrier.
- the receiving apparatus 20 estimates the number of delayed samples ⁇ l of the delayed wave based on the FSK symbol demodulated once by hard decision, and uses the estimated values obtained up to the previous symbol to obtain the preceding wave component and the delayed wave component. Generate a metric that combines As a result, the receiver 20 can obtain path diversity gain from the preceding wave and the delayed wave. In addition, receiving apparatus 20 is guaranteed to be able to avoid the case where delayed wave components appear in FSK candidate carriers in one symbol out of two consecutive symbols by changing the FSK carrier spacing in transmitting apparatus 10 . Therefore, the receiving apparatus 20 can accurately estimate the number of delayed samples ⁇ l of the delayed wave in the symbol that can avoid the case, and can also estimate the delay wave in the other symbol that cannot avoid the case. can be separated, and as a result can be correctly demodulated.
- the transmitting apparatus 10 avoids demodulation errors caused by multipath and uses pilot signals in the receiving apparatus 20 of the communication system 1 that applies asynchronous detection to frequency shift modulation with chirp spreading. It is possible to transmit a signal capable of obtaining a diversity effect due to multipath without transmission.
- Embodiment 2 As described in Embodiment 1, transmitting apparatus 10 is configured so that delayed wave components do not appear in FSK candidate carriers on the frequency spectrum of despread signals in receiving apparatus 20 in one symbol out of two consecutive symbols. It is characterized by transmitting signals. Embodiment 2 describes another method for realizing this.
- FIG. 8 is a block diagram showing a configuration example of a transmission device 10a according to Embodiment 2.
- the transmitting apparatus 10 a includes an FSK modulation section 12 a , a direct spreading section 13 a , a transmission antenna 14 and a chirp sequence number control section 15 .
- FIG. 9 is a flow chart showing the operation of the transmitting device 10a according to the second embodiment.
- the configuration of the communication system is a configuration obtained by replacing the transmission device 10 in the communication system 1 shown in FIG. 1 with a transmission device 10a.
- the FSK modulation unit 12a performs FSK modulation (step S31).
- the FSK carrier spacing in FSK modulation of FSK modulation section 12a is the same for all symbols.
- the chirp sequence number control unit 15 controls the sequence number of the chirp sequence to be used for each symbol (step S32). Specifically, the chirp sequence number control unit 15 changes q in the above equation (2) for each symbol. The chirp sequence number control unit 15 particularly makes the chirp sequence numbers selected between two consecutive symbols relatively prime. As a result, the transmitting apparatus 10a can change the subcarrier position where the delayed wave component appears, although the position of the FSK candidate carrier does not change for each symbol.
- the direct spreading unit 13a Based on the sequence number of the chirp sequence determined by the chirp sequence number control unit 15, the direct spreading unit 13a directly spreads the FSK symbols generated by the FSK modulation unit 12a with the chirp sequence (step S33). .
- the transmitting antenna 14 transmits the signal xn directly spread by the direct spreading section 13a to the receiving device 20 (step S34).
- chirp sequence number control section 15 prevents multipath delayed wave components from appearing in FSK candidate carriers in one of two consecutive symbols in the frequency spectrum of the signal after despreading in receiving apparatus 20. It is a control unit that controls a signal to be transmitted to the receiving device 20 as shown in FIG. Specifically, the chirp sequence number control unit 15 changes the chirp sequence number for each symbol so that the chirp sequence numbers selected between two consecutive symbols are relatively prime.
- the configuration and operation of the receiving device 20 are the same as in the first embodiment, so the description of the configuration and operation of the receiving device 20 is omitted.
- the transmission antenna 14 is an antenna element.
- the FSK modulation unit 12a, the direct spreading unit 13a, and the chirp sequence number control unit 15 are realized by processing circuits.
- the processing circuitry may be a processor and memory executing programs stored in the memory, or may be dedicated hardware.
- transmitting apparatus 10a changes the chirp sequence number for each symbol. Also in this case, the same effect as in the first embodiment can be obtained in transmitting device 10a and receiving device 20.
- FIG. 10a shows the same effect as in the first embodiment.
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Abstract
Description
図1は、実施の形態1に係る通信システム1の構成例を示す図である。通信システム1は、送信装置10と、受信装置20と、を備える。通信システム1は、送信装置10が無線信号を送信し、受信装置20が無線信号を受信することによって無線通信を行う無線通信システムである。
実施の形態1で説明したように、連続する2シンボルのうち1シンボルにおいて受信装置20での逆拡散後信号の周波数スペクトル上で遅延波成分がFSK候補キャリアに現れないように、送信装置10が信号を送信することに特徴がある。実施の形態2では、これを実現するための他の方法について説明する。
Claims (14)
- 受信装置と無線通信を行う送信装置であって、
入力される情報ビット列に対して周波数シフト変調を行い、周波数シフト変調シンボルを生成する変調部と、
前記周波数シフト変調シンボルに対してチャープ系列による直接拡散を施す直接拡散部と、
前記受信装置で逆拡散後の信号の周波数スペクトルにおいて、連続する2シンボルのうち1シンボルでマルチパスの遅延波成分が周波数シフト変調候補キャリアに現れないように前記受信装置に送信する信号を制御する制御部と、
を備えることを特徴とする送信装置。 - 前記制御部は、連続する2シンボル間で選択される前記周波数シフト変調シンボルのキャリア間隔が互いに素となるように前記シンボルごとに前記周波数シフト変調シンボルのキャリア間隔を変化させ、
前記変調部は、前記制御部で決定された前記周波数シフト変調シンボルのキャリア間隔に基づいて、前記周波数シフト変調を行う、
ことを特徴とする請求項1に記載の送信装置。 - 前記制御部は、連続する2シンボル間で選択されるチャープ系列番号が互いに素となるように前記シンボルごとに前記チャープ系列番号を変化させ、
前記直接拡散部は、前記制御部で決定された前記チャープ系列番号に基づいて、前記周波数シフト変調シンボルに対して直接拡散を施す、
ことを特徴とする請求項1に記載の送信装置。 - 送信装置と無線通信を行う受信装置であって、
前記送信装置から送信され、受信した信号を逆拡散する逆拡散部と、
逆拡散された信号に対してフーリエ変換を施し、周波数信号を生成するフーリエ変換部と、
前記周波数信号における各サブキャリアの電力を計算する電力計算部と、
遅延波の遅延サンプル数に基づいて、各周波数シフト変調候補キャリアの候補点から前記遅延サンプル数だけ前方に巡回シフトしたサブキャリアの電力を対応する周波数シフト変調候補シンボルのメトリックに加算し、メトリックを合成するメトリック合成部と、
各周波数シフト変調候補シンボルの合成後のメトリックを硬判定し、前記送信装置からの送信周波数シフト変調信号を推定する復調部と、
前記周波数信号から遅延波電力が位置するサブキャリアを検出し、前記遅延波電力のサブキャリアの位置と、推定された前記送信周波数シフト変調信号に対応するサブキャリア位置との差分から前記遅延波の遅延サンプル数を推定する遅延波検出部と、
を備えることを特徴とする受信装置。 - 前記遅延波検出部は、雑音の統計的性質を利用した閾値判定によって前記遅延波の遅延サンプル数を推定する、
ことを特徴とする請求項4に記載の受信装置。 - 前記メトリック合成部は、最大比合成規範または選択合成規範に基づいて、メトリックを合成する、
ことを特徴とする請求項4または5に記載の受信装置。 - 前記遅延波検出部は、直前の1シンボルで推定した前記遅延波の遅延サンプル数、または直前の複数のシンボルで推定した複数の遅延波の遅延サンプル数の平均値を前記メトリック合成部に出力する、
ことを特徴とする請求項4から6のいずれか1つに記載の受信装置。 - 請求項1から3のいずれか1つに記載の送信装置と、
請求項4から7のいずれか1つに記載の受信装置と、
を備えることを特徴とする通信システム。 - 受信装置と無線通信を行う送信装置を制御するための制御回路であって、
入力される情報ビット列に対して周波数シフト変調を行い、周波数シフト変調シンボルを生成、
前記周波数シフト変調シンボルに対してチャープ系列による直接拡散、
前記受信装置で逆拡散後の信号の周波数スペクトルにおいて、連続する2シンボルのうち1シンボルでマルチパスの遅延波成分が周波数シフト変調候補キャリアに現れないように前記受信装置に送信する信号を制御、
を前記送信装置に実施させることを特徴とする制御回路。 - 送信装置と無線通信を行う受信装置を制御するための制御回路であって、
前記送信装置から送信され、受信した信号を逆拡散、
逆拡散された信号に対してフーリエ変換を施し、周波数信号を生成、
前記周波数信号における各サブキャリアの電力を計算、
遅延波の遅延サンプル数に基づいて、各周波数シフト変調候補キャリアの候補点から前記遅延サンプル数だけ前方に巡回シフトしたサブキャリアの電力を対応する周波数シフト変調候補シンボルのメトリックに加算し、メトリックを合成、
各周波数シフト変調候補シンボルの合成後のメトリックを硬判定し、前記送信装置からの送信周波数シフト変調信号を推定、
前記周波数信号から遅延波電力が位置するサブキャリアを検出し、前記遅延波電力のサブキャリアの位置と、推定された前記送信周波数シフト変調信号に対応するサブキャリア位置との差分から前記遅延波の遅延サンプル数を推定、
を前記受信装置に実施させることを特徴とする制御回路。 - 受信装置と無線通信を行う送信装置を制御するためのプログラムが記憶された記憶媒体であって、
前記プログラムは、
入力される情報ビット列に対して周波数シフト変調を行い、周波数シフト変調シンボルを生成、
前記周波数シフト変調シンボルに対してチャープ系列による直接拡散、
前記受信装置で逆拡散後の信号の周波数スペクトルにおいて、連続する2シンボルのうち1シンボルでマルチパスの遅延波成分が周波数シフト変調候補キャリアに現れないように前記受信装置に送信する信号を制御、
を前記送信装置に実施させることを特徴とする記憶媒体。 - 送信装置と無線通信を行う受信装置を制御するためのプログラムが記憶された記憶媒体であって、
前記プログラムは、
前記送信装置から送信され、受信した信号を逆拡散、
逆拡散された信号に対してフーリエ変換を施し、周波数信号を生成、
前記周波数信号における各サブキャリアの電力を計算、
遅延波の遅延サンプル数に基づいて、各周波数シフト変調候補キャリアの候補点から前記遅延サンプル数だけ前方に巡回シフトしたサブキャリアの電力を対応する周波数シフト変調候補シンボルのメトリックに加算し、メトリックを合成、
各周波数シフト変調候補シンボルの合成後のメトリックを硬判定し、前記送信装置からの送信周波数シフト変調信号を推定、
前記周波数信号から遅延波電力が位置するサブキャリアを検出し、前記遅延波電力のサブキャリアの位置と、推定された前記送信周波数シフト変調信号に対応するサブキャリア位置との差分から前記遅延波の遅延サンプル数を推定、
を前記受信装置に実施させることを特徴とする記憶媒体。 - 受信装置と無線通信を行う送信装置の送信方法であって、
変調部が、入力される情報ビット列に対して周波数シフト変調を行い、周波数シフト変調シンボルを生成する第1のステップと、
直接拡散部が、前記周波数シフト変調シンボルに対してチャープ系列による直接拡散を施す第2のステップと、
制御部が、前記受信装置で逆拡散後の信号の周波数スペクトルにおいて、連続する2シンボルのうち1シンボルでマルチパスの遅延波成分が周波数シフト変調候補キャリアに現れないように前記受信装置に送信する信号を制御する第3のステップと、
を含むことを特徴とする送信方法。 - 送信装置と無線通信を行う受信装置の受信方法であって、
逆拡散部が、前記送信装置から送信され、受信した信号を逆拡散する第1のステップと、
フーリエ変換部が、逆拡散された信号に対してフーリエ変換を施し、周波数信号を生成する第2のステップと、
電力計算部が、前記周波数信号における各サブキャリアの電力を計算する第3のステップと、
メトリック合成部が、遅延波の遅延サンプル数に基づいて、各周波数シフト変調候補キャリアの候補点から前記遅延サンプル数だけ前方に巡回シフトしたサブキャリアの電力を対応する周波数シフト変調候補シンボルのメトリックに加算し、メトリックを合成する第4のステップと、
復調部が、各周波数シフト変調候補シンボルの合成後のメトリックを硬判定し、前記送信装置からの送信周波数シフト変調信号を推定する第5のステップと、
遅延波検出部が、前記周波数信号から遅延波電力が位置するサブキャリアを検出し、前記遅延波電力のサブキャリアの位置と、推定された前記送信周波数シフト変調信号に対応するサブキャリア位置との差分から前記遅延波の遅延サンプル数を推定する第6のステップと、
を含むことを特徴とする受信方法。
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