WO2022102042A1 - Dispositif de transmission, dispositif de réception, système de communication à spectre étalé, circuit de commande, support de stockage, procédé de transmission et procédé de réception - Google Patents

Dispositif de transmission, dispositif de réception, système de communication à spectre étalé, circuit de commande, support de stockage, procédé de transmission et procédé de réception Download PDF

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Publication number
WO2022102042A1
WO2022102042A1 PCT/JP2020/042214 JP2020042214W WO2022102042A1 WO 2022102042 A1 WO2022102042 A1 WO 2022102042A1 JP 2020042214 W JP2020042214 W JP 2020042214W WO 2022102042 A1 WO2022102042 A1 WO 2022102042A1
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signal
transmission
synchronization
unit
transmitting
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PCT/JP2020/042214
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English (en)
Japanese (ja)
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亮介 中村
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三菱電機株式会社
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Priority to PCT/JP2020/042214 priority Critical patent/WO2022102042A1/fr
Priority to JP2022561772A priority patent/JP7199619B2/ja
Priority to TW110123084A priority patent/TW202220395A/zh
Publication of WO2022102042A1 publication Critical patent/WO2022102042A1/fr

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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

Definitions

  • the present disclosure relates to a transmission device, a reception device, a spectrum diffusion communication system, a control circuit, a storage medium, a transmission method, and a reception method for performing spectrum diffusion communication.
  • the direct spread method is a spread series such as a chapter signal and a PN (Pseudorandom Noise) series for a modulated signal that is primarily modulated by PSK (Phase Shift Keying), FSK (Frequency Shift Keying), etc. It is a method of transmitting with a bandwidth wider than the bandwidth of the first-order modulation by multiplying by.
  • despreading is performed by multiplying by a sequence having the inverse characteristic of the diffusing sequence, and the modulated signal is taken out. By performing such processing, the power gain corresponding to the diffusion sequence length to be multiplied by one signal of the modulated signal can be obtained.
  • the direct diffusion method is a long-distance communication operated at a low SNR (Signal to Noise Ratio). Suitable for.
  • LPWA Low Power Wide Area
  • IoT Internet of Things
  • Chirp signals include an up chirp signal whose frequency linearly increases with time and a down chirp signal whose frequency linearly decreases with time.
  • ZC Zero Auto Correlation
  • CAZAC Constant Amplitude Zero Auto Correlation
  • the receiving device In order to perform long-distance communication, the receiving device Then, there is a problem that the circuit scale of the timing synchronization processing increases. Further, when the transmitting device uses a plurality of antennas to obtain diversity gain and transmits using different diffusion sequences so that the signals transmitted from the antennas do not interfere with each other, the receiver device performs each diffusion sequence as a timing synchronization process. There is a problem that the circuit scale is further increased because it is necessary to perform the synchronization processing for.
  • the present disclosure has been made in view of the above, and when a signal is transmitted using a plurality of antennas in a spread spectrum communication method, the present disclosure is performed with high accuracy while suppressing an increase in the circuit scale of timing synchronization processing in a receiving device.
  • the purpose is to obtain a transmitter capable of timing synchronization.
  • the present disclosure is a transmitting device that performs wireless communication with a receiving device in a spectral diffusion communication system.
  • the transmission device has a diffusion processing unit that multiplies a modulated signal in which the transmission bit series is modulated by a diffusion series to perform diffusion processing, and a transmission path for the signal diffused by the diffusion processing unit based on the number of transmitting antennas.
  • a transmission path coding unit that performs coding, a synchronization charp signal generation unit that generates a synchronization charp signal for timing synchronization in the receiving device, and a block unit signal obtained by shifting the synchronization time of the synchronization charp signal by a patrol time are generated.
  • a time shift section that generates the same number of known sequences consisting of signals of multiple blocks as the number of transmitting antennas, and a data sequence and a known sequence that are connected to different transmitting antennas and coded by the transmission path coding section. It is characterized by including a waveform shaping / synthesizing unit having the same number as the number of transmitting antennas, which synthesizes and generates different transmission signals and transmits them from the transmitting antenna.
  • the transmitting device has an effect that when a signal is transmitted using a plurality of antennas in a spread spectrum communication method, timing synchronization can be performed accurately while suppressing an increase in the circuit scale of timing synchronization processing in the receiving device. Play.
  • the figure which shows the structural example of the spectral diffusion communication system which concerns on this Embodiment The first figure which shows the example of the chirp signal used in the spectrum diffusion communication system which concerns on this embodiment.
  • a block diagram showing a configuration example of a receiving device according to the present embodiment A flowchart showing the operation of the receiving device according to the present embodiment.
  • a block diagram showing a configuration example of a timing synchronization unit included in the receiving device according to the present embodiment A flowchart showing the operation of the timing synchronization unit included in the receiving device according to the present embodiment.
  • the transmission device the reception device, the spectrum diffusion communication system, the control circuit, the storage medium, the transmission method, and the reception method according to the embodiment of the present disclosure will be described in detail with reference to the drawings.
  • FIG. 1 is a diagram showing a configuration example of the spectrum diffusion communication system 300 according to the present embodiment.
  • the spectrum diffusion communication system 300 includes a transmission device 100 and a reception device 200.
  • the spectrum diffusion communication system 300 shown in FIG. 1 simply shows an image of the operation of the transmission device 100 and the reception device 200 that perform wireless communication by the spectrum diffusion communication method.
  • the transmission device 100 performs primary modulation on the transmission bit sequence using PSK, FSK, or the like.
  • the transmission device 100 uses a chirp signal as a diffusion sequence to directly diffuse the modulated signal, thereby widening the bandwidth of the signal by the diffusion sequence length.
  • FIG. 1 shows a state in which the bandwidth of a modulated signal is converted from a narrow band to a wide band by direct diffusion.
  • the transmission device 100 transmits the spread signal with a wide bandwidth.
  • the receiving device 200 performs timing synchronization with respect to the received signal.
  • the receiving device 200 detects the start position of the received frame, which is the signal after spreading, by timing synchronization, multiplies the sequence having the opposite characteristic to the spreading sequence used in the transmitting device 100, and reverse-spreads the signal before spreading. Extract the signal.
  • the sequence having an inverse characteristic with respect to the diffusion sequence used in the transmission device 100 is, for example, a sequence in which the phase value is inverted by a complex signal in the case of a constant envelope signal such as the ZC sequence used for a chirp signal.
  • FIG. 1 shows a state in which the bandwidth of a received signal is converted from a wide band to a narrow band by despreading.
  • the narrow band received signal corresponds to the signal before diffusion in the transmitting device 100.
  • the receiving device 200 obtains a receiving bit sequence by performing demodulation processing on the signal before diffusion.
  • FIG. 1 simply shows an image of the operation of the transmitting device 100 and the receiving device 200, only the baseband signal processing is described, and the ADC (Analog to Digital Converters) and DAC (Digital to Analog Converters) are described. , Power amplifier, AGC (Auto Gain Control), etc. are omitted. A detailed configuration and operation of the transmitting device 100 and the receiving device 200 using the functional block will be described later.
  • FIG. 2 is a first diagram showing an example of a chirp signal used in the spectrum diffusion communication system 300 according to the present embodiment.
  • FIG. 3 is a second diagram showing an example of a chirp signal used in the spectral diffusion communication system 300 according to the present embodiment.
  • the horizontal axis represents time and the vertical axis represents frequency.
  • FIG. 2 shows the time and frequency characteristics of an up-chirp signal, which is a chirp signal.
  • the up-chirp signal is a chirp signal whose frequency linearly increases with time.
  • FIG. 3 shows the time and frequency characteristics of the down chirp signal, which is a chirp signal.
  • FIG. 1 shows an example of a chirp signal used in the spectrum diffusion communication system 300 according to the present embodiment.
  • FIG. 3 is a second diagram showing an example of a chirp signal used in the spectral diffusion communication system 300 according to the present embodiment.
  • the horizontal axis represents time and the vertical axis represents frequency.
  • FIG. 2
  • the down chirp signal is a chirp signal whose frequency linearly decreases with time.
  • the up-chirp signal will be described as an example, a signal obtained by combining either or both of the up-chirp signal and the down-chirp signal may be used as a known series.
  • FIG. 4 is a diagram showing an example of a known series used in a transmission signal transmitted from the first transmission antenna of the transmission device 100 according to the present embodiment.
  • FIG. 5 is a diagram showing an example of a known series used in a transmission signal transmitted from the second transmission antenna of the transmission device 100 according to the present embodiment.
  • the horizontal axis represents time and the vertical axis represents frequency.
  • the chirp signals shown in FIGS. 4 and 5 are up-chirp signals that increase by one frequency corresponding to one square on the vertical axis in the figure per one-hour slot corresponding to one square on the horizontal axis in the figure.
  • a 5-hour slot is used as one block, and two blocks are used as one known series.
  • the block # 1 is a series that increases in order from the frequency (1)
  • the block # 2 is a series that increases in order from the frequency (4). do.
  • the process is performed so as to cyclically shift to the frequency (1) after the frequency (4). That is, when the sequence of block # 1 is used as a reference, the sequence of block # 2 is a sequence that is time-shifted in the negative direction by one frequency.
  • the known sequence used in the second transmitting antenna shown in FIG. 5 is assumed to have the sequence order of blocks # 1 and block # 2 interchanged with respect to the known sequence used in the first transmitting antenna.
  • the frequency component shown by the dotted line in FIGS. 4 and 5 is actually a signal component to be transmitted, but will be omitted in the following description. These frequency components are components that are not detected in the timing synchronization process of the receiving device 200, which will be described later.
  • FIGS. 4 and 5 since the dotted line portion occupies one-fifth of the diffusion sequence length of each block, it seems that the power loss is large when it is not detected. However, when the diffusion sequence length is lengthened for long-distance communication and the number of time slots and frequency components is increased to 1024, for example, the ratio occupied by the dotted line portion becomes very small, 1/1052, and is not detected. It can be said that the amount of decrease in synchronization accuracy due to the above is slight.
  • FIG. 6 is a block diagram showing a configuration example of the transmission device 100 according to the present embodiment.
  • the transmission device 100 includes a modulation unit 110, a chirp signal generation unit 120, a diffusion processing unit 130, a transmission line coding unit 140, a synchronization chirp signal generation unit 150, a time shift unit 160, and a waveform shaping / synthesizing unit. It is provided with 170-1 and 170-2 and transmission antennas 180-1 and 180-2.
  • the transmitting antenna 180-1 corresponds to the above-mentioned first transmitting antenna
  • the transmitting antenna 180-2 corresponds to the above-mentioned second transmitting antenna.
  • FIG. 7 is a flowchart showing the operation of the transmission device 100 according to the present embodiment.
  • the modulation unit 110 performs primary modulation on the transmission bit sequence using PSK, FSK, or the like (step S101).
  • the modulation unit 110 performs a process corresponding to the “primary modulation” of FIG.
  • the chirp signal generation unit 120 generates a chirp signal for diffusion processing (step S102). Although the diffusion sequence is used as a chirp signal here, the chirp signal generation unit 120 may generate another diffusion sequence because the known sequence may be a chirp signal in the present embodiment.
  • the diffusion processing unit 130 directly diffuses, that is, performs diffusion processing by multiplying the modulated signal primary-modulated by the modulation unit 110 by the chirp signal generated by the chirp signal generation unit 120 (step S103).
  • the chirp signal generation unit 120 and the diffusion processing unit 130 perform processing corresponding to the “direct diffusion” in FIG.
  • the transmission path coding unit 140 transmits the signal based on the number of transmission antennas 180.
  • Road coding is performed (step S104).
  • the transmission line coding may be any method as long as it does not interfere between the transmission signals transmitted from the two transmission antennas 180-1 and 180-2, and may be an Alamouti STBC (Space Time Block Coding) method or a chirp. If it is a signal, it may be a process of shifting the frequency of one to the other.
  • the transmission line coding unit 140 outputs the data series which is the signal after the transmission line coding to the waveform shaping and synthesizing units 170-1 and 170-2.
  • the synchronization chirp signal generation unit 150 generates a timing synchronization chirp signal in the receiving device 200 (step S105). Specifically, the synchronization chirp signal generation unit 150 generates the signal of the block # 1 among the known series for the transmission antenna 180-1 shown in FIG.
  • the time shift unit 160 acquires the signal of the block # 1 for the transmission antenna 180-1 from the synchronization chirp signal generation unit 150, and performs a time shift with respect to the signal of the block # 1 for the transmission antenna 180-1. Generates the signal of block # 2 for transmit antenna 180-1.
  • the time shift unit 160 uses the acquired signal of block # 1 for transmission antenna 180-1 and the generated signal of block # 2 for transmission antenna 180-1 for the transmission antenna 180-1 shown in FIG. And the known sequence for the transmit antenna 180-2 shown in FIG. 5 is generated.
  • the time shift unit 160 generates a block-based signal obtained by cyclically shifting the synchronization chirp signal in block units, and generates the same number of known sequences including signals of a plurality of blocks as the number of transmitting antennas 180 (step S106).
  • the time shift amount in the time shift unit 160 may be zero for some blocks.
  • the time shift unit 160 outputs the known sequence for the transmitting antenna 180-1 to the waveform shaping / combining unit 170-1, and outputs the known sequence for the transmitting antenna 180-2 to the waveform shaping / combining unit 170-2.
  • the waveform shaping / synthesizing unit 170-1 combines the data sequence acquired from the transmission line coding unit 140 and the known sequence for the transmission antenna 180-1 acquired from the time shift unit 160 into, for example, the known sequence and the data sequence in this order. Synthesize to be.
  • the waveform shaping and synthesizing unit 170-1 transmits the synthesized and framed signal as the first transmission signal from the transmission antenna 180-1.
  • the waveform shaping / synthesizing unit 170-2 may obtain, for example, a known series and data of a data series acquired from the transmission line coding unit 140 and a known series for the transmission antenna 180-2 acquired from the time shift unit 160. Synthesize in the order of the series.
  • the waveform shaping and synthesizing unit 170-2 transmits the synthesized and framed signal as a second transmission signal from the transmission antenna 180-2.
  • the waveform shaping and synthesizing units 170-1 and 170-2 are connected to different transmission antennas 180, and are generated by the transmission line coded data series and the time shift unit 160 by the transmission line coding unit 140.
  • a different transmission signal is generated by synthesizing the known sequence and transmitted from the transmission antenna 180 (step S107).
  • the number of waveform shaping and synthesizing units 170 is the same as the number of transmitting antennas 180.
  • FIG. 8 is a diagram showing a frame example of each transmission signal generated and transmitted by the transmission device 100 according to the present embodiment.
  • the horizontal axis represents time.
  • a known sequence is added to the head of the transmission signal, but this is only an example, and the present invention is not limited to this.
  • the waveform shaping / synthesizing unit 170 may apply the known sequence to a position other than the beginning of the transmission signal.
  • the number of transmitting antennas 180 included in the transmitting device 100 is two or more.
  • the transmission signal transmitted from each transmission antenna 180 of the transmission device 100 includes a known series in which the circulation time shift amount of the synchronization chirp signal is different.
  • the known series is composed of a block number equal to or larger than the number of transmission antennas 180, and the circulation time shift amount of the synchronization chirp signal at the same block position is different for each transmission signal transmitted from each transmission antenna 180.
  • the number of candidates for the patrol time shift amount which is the cumulative total of the patrol time shift amounts in all blocks, is the same for each transmission signal.
  • FIG. 9 shows an example of a known sequence portion of a synthetic signal received by the receiving device 200 when the transmitting device 100 according to the present embodiment transmits a transmitting signal using two transmitting antennas 180-1 and 180-2. It is a figure which shows.
  • the horizontal axis represents time and the vertical axis represents frequency.
  • the black line shows the known sequence of the signal transmitted and received from the transmitting antenna 180-1
  • the white line shows the known sequence of the signal transmitted and received from the transmitting antenna 180-2.
  • FIG. 10 is a diagram showing an example of a known sequence for correlation processing generated for detecting the start position of a chirp signal for synchronization with respect to a synthesized signal in the receiving device 200 according to the present embodiment.
  • the receiving device 200 may generate a sequence for one block out of a known sequence consisting of two blocks.
  • the known sequence generated by the receiving device 200 corresponds to each block of the known sequence shown in FIGS. 4 and 5, excluding the dotted line portion.
  • FIG. 11 shows a case where the receiving device 200 according to the present embodiment performs cross-correlation using the known series for correlation processing shown in FIG. 10 when the synthesized signal shown in FIG. 9 is received, and calculates the correlation value. It is a figure which shows the output image.
  • FIG. 11A is the same as FIG. 9 described above.
  • FIG. 11B the horizontal axis represents time and the vertical axis represents the correlation value.
  • the correlation value peaks for the components increasing by 1 hour slot at frequencies (1) to (4). , Time (1), Time (2), Time (6), and Time (7), respectively, to obtain peak correlation values.
  • the propagation loss between the transmitting antenna 180-1 and the receiving antenna of the receiving device 200 and the propagation loss between the transmitting antenna 180-2 and the receiving antenna of the receiving device 200 have different values. In the example, it is treated as the same propagation loss.
  • the receiving device 200 After detecting the peak of the correlation value, the receiving device 200 synthesizes each peak of the correlation value as described later.
  • the known series is composed of only the up-chirp signal, but when the signal obtained by combining the up-chirp signal and the down-chirp signal is the known series, the receiving device 200 has the up-chirp signal and the down. Correlation processing is performed individually for each series of chirp signals, and then the correlation values obtained for each are synthesized.
  • the receiving device 200 in order to make the receiving device 200 have the same circuit scale as that of the present embodiment, it is necessary to make each series of the up chirp signal and the down chirp signal a known series having a total slot length of 4 hours for 2 hours slots. be.
  • FIG. 12 is a diagram showing an image in which the receiving device 200 according to the present embodiment synthesizes peaks with respect to the correlation value calculated in FIG.
  • the horizontal axis represents time and the vertical axis represents the correlation value.
  • FIG. 12 (a) is the same as FIG. 11 (b) described above.
  • the receiving device 200 performs inter-block synthesis on the output of the correlation processing, and takes the sum of the power with the correlation value one block time ago. As a result, the correlation value characteristic shown in FIG. 12 (b) is obtained.
  • the receiving device 200 performs in-block synthesis with respect to the correlation value characteristic of FIG. 12B, and the time shift is performed by the transmitting device 100. In the present embodiment, specifically, only one hour slot is performed. Take the sum of power with the previous correlation value. As a result, the correlation value characteristic shown in FIG. 12 (c) is obtained.
  • the receiving device 200 identifies the position of the known series by detecting the peak of the final correlation value characteristic.
  • the correlation value peak is obtained at the beginning of the time (2) of the known series, it can be seen that the position one hour before the peak position is the beginning position of the known series.
  • the method for detecting the correlation value peak of the receiving device 200 of the present embodiment even if the transmitting signal of one of the transmitting antennas 180 of the transmitting device 100 is not obtained, either the black line or the white line shown in FIG. 12 is obtained. Is not obtained as a correlation value, and a correlation value peak is obtained at the same position for the transmission signal of the other transmission antenna 180 of the transmission device 100.
  • the receiving device 200 can perform timing synchronization as long as the transmission signal of any of the transmitting antennas 180 can be received regardless of the state of the radio propagation path between the transmitting device 100 and the receiving device 200. Further, it can be said that the same timing synchronization method can be applied to the receiving device 200 even if the transmitting device 100 has only one transmitting antenna 180.
  • FIG. 13 is a block diagram showing a configuration example of the receiving device 200 according to the present embodiment.
  • the receiving device 200 includes a receiving antenna 210, a band limiting unit 220, a timing synchronization unit 230, a despreading processing unit 240, and a demodulation unit 250.
  • FIG. 14 is a flowchart showing the operation of the receiving device 200 according to the present embodiment.
  • the band limiting unit 220 limits the band of the received signal received by the receiving antenna 210 by a band limiting filter (step S201).
  • the band limiting unit 220 extracts only the signal of a desired band, that is, the information of the receiving channel by band limiting.
  • the timing synchronization unit 230 performs timing synchronization using the information of the reception channel extracted by the band limitation unit 220, and detects the head position of the reception frame included in the reception signal (step S202).
  • the timing synchronization unit 230 performs a process corresponding to the “timing synchronization” in FIG.
  • FIG. 15 is a block diagram showing a configuration example of the timing synchronization unit 230 included in the receiving device 200 according to the present embodiment.
  • the timing synchronization unit 230 includes a correlation sequence generation unit 231, a correlation processing unit 232, an inter-block synthesis unit 233, an in-block synthesis unit 234, and a peak detection unit 235.
  • FIG. 16 is a flowchart showing the operation of the timing synchronization unit 230 included in the receiving device 200 according to the present embodiment.
  • the correlation sequence generation unit 231 generates a known sequence for correlation processing as shown in FIG. 10 (step S301).
  • the known sequence for correlation processing includes all or a part of the synchronization chirp signal for timing synchronization generated by the synchronization chirp signal generation unit 150 of the transmission device 100.
  • the correlation processing unit 232 performs correlation processing between the signal of the desired band extracted by the band limiting unit 220 and the known sequence for correlation processing generated by the correlation sequence generation unit 231 (step S302). By the correlation processing of the correlation processing unit 232, the peak of the correlation value as shown in FIG. 12A is obtained.
  • the inter-block synthesizing unit 233 performs inter-block synthesizing with respect to the output from the correlation processing unit 232 (step S303), and synthesizes the electric power of all the blocks of the known series.
  • the correlation value peak as shown in FIG. 12B is obtained.
  • the in-block synthesis unit 234 performs in-block synthesis with respect to the output from the inter-block synthesis unit 233 (step S304), and synthesizes the correlation value for the time shift added by the transmission device 100.
  • the correlation value peak as shown in FIG. 12 (c) is obtained.
  • the peak detection unit 235 detects the correlation value peak from the output from the in-block synthesis unit 234, that is, the correlation value peak as shown in FIG. 12 (c), and specifies the head position of the received frame (step S305).
  • the peak detection unit 235 outputs position information for specifying the start position of the received frame as a result of timing synchronization.
  • the timing synchronization unit 230 generates a known sequence for correlation processing including all or a part of the synchronization chirp signal for timing synchronization generated by the transmission device 100, and signals in a desired band for correlation processing.
  • the correlation value peak is detected from the correlation value obtained by performing the correlation processing with the known series, and the timing synchronization for specifying the head position of the received frame included in the received signal is performed.
  • the timing synchronization unit 230 synthesizes the peak value obtained by the correlation processing between blocks of a known series consisting of signals of a plurality of blocks having different patrol time shift amounts, and further performs synthesis within the blocks. Timing synchronization is performed by performing peak detection.
  • the despreading processing unit 240 identifies the position of the receiving frame from the signal of the desired band extracted by the band limiting unit 220 using the position information acquired from the timing synchronization unit 230, and the spreading used in the transmission device 100. Multiply the sequence having the inverse characteristic with respect to the sequence and backdiffuse (step S203).
  • the dediffusion processing unit 240 extracts the signal before diffusion in the transmission device 100 by dediffusion.
  • the back-diffusion processing unit 240 performs a process corresponding to the "back-diffusion" in FIG.
  • the demodulation unit 250 extracts a data series from the signal before diffusion and performs demodulation processing (step S204).
  • the demodulation unit 250 obtains a received bit sequence by demodulation processing.
  • the demodulation unit 250 performs a process corresponding to the “demodulation” in FIG.
  • the receiving device 200 performs the timing synchronization as described above, so that the receiving device 200 can perform simple processing with high accuracy. Timing synchronization can be performed.
  • the number of transmitting antennas 180 of the transmitting device 100 is two is described in the present embodiment, it is an example and can be applied to the case where the number of transmitting antennas 180 of the transmitting device 100 is three. Specifically, for the known series for timing synchronization, each time the number of transmitting antennas 180 of the transmitting device 100 is increased by one, the number of time shift candidates is increased by one or more in each block, and the number of blocks constituting the same is also one. Increase more than that.
  • FIG. 17 is a diagram showing a known sequence portion of a synthetic signal received by the receiving device 200 when the transmitting device 100 according to the present embodiment transmits a transmitting signal using three transmitting antennas 180.
  • FIG. 18 is a diagram showing an image in which a receiving device 200 synthesizes a correlation value peak when a transmitting device 100 according to the present embodiment transmits a transmission signal using three transmitting antennas 180.
  • FIG. 19 is a diagram showing a known sequence portion of a synthetic signal received by the receiving device 200 when the transmitting device 100 according to the present embodiment transmits a transmitting signal using four transmitting antennas 180.
  • FIG. 18 is a diagram showing an image in which a receiving device 200 synthesizes a correlation value peak when a transmitting device 100 according to the present embodiment transmits a transmission signal using three transmitting antennas 180.
  • FIG. 19 is a diagram showing a known sequence portion of a synthetic signal received by the receiving device 200 when the transmitting device 100 according to the present embodiment transmits a transmitting signal
  • FIGS. 17 to 20 is a diagram showing an image in which a receiving device 200 synthesizes a correlation value peak when a transmitting device 100 according to the present embodiment transmits a transmission signal using four transmitting antennas 180.
  • the signal corresponding to the signal transmitted from the first transmitting antenna of the transmitting device 100 is shown by a black line
  • the signal corresponding to the signal transmitted from the second transmitting antenna of the transmitting device 100 is shown by a black line.
  • the signal corresponding to the signal transmitted from the third transmitting antenna of the transmitting device 100 is shown by a dotted line.
  • FIGS. 19 and 20 the signal corresponding to the signal transmitted from the fourth transmitting antenna of the transmitting device 100 is shown by a triple line.
  • the transmission device 100 cyclically shifts the time shift amount for each block, such as 0.1.2, 1.2.0, 20.1.
  • the receiving device 200 performs correlation processing on the received signal using the same known sequence for correlation processing as in the case where the number of transmitting antennas 180 is two, then performs inter-block synthesis for three blocks, and finally.
  • the correlation value characteristics shown in FIG. 18 can be obtained by synthesizing the peak values corresponding to the time shift amounts 0, 1 and 2 in the block synthesis. Even if the number of transmitting antennas 180 of the transmitting device 100 is four, the number of blocks of the known series is increased by one and the candidate for the time shift amount of each block is also increased by one for the case where the number of transmitting antennas 180 is three. It is possible to deal with this.
  • the pattern generation method for known series is generalized, the following three generation conditions are obtained.
  • the first is to configure a known series with a number of blocks equal to or greater than the number of transmitting antennas 180 of the transmitting device 100, and to provide more than the number of transmitting antennas 180 of the transmitting device 100 as candidates for the time shift amount of each block.
  • each time shift amount candidate is used the same number of times in total in all the blocks configured as the known series.
  • the transmitting antenna 180 is realized by an antenna element.
  • the modulation unit 110, the chirp signal generation unit 120, the diffusion processing unit 130, the transmission line coding unit 140, the synchronization chirp signal generation unit 150, the time shift unit 160, and the waveform shaping and synthesizing unit 170 are realized by a processing circuit.
  • the processing circuit may be a processor and memory for executing a program stored in the memory, or may be dedicated hardware.
  • the processing circuit is also called a control circuit.
  • FIG. 21 is a diagram showing a configuration example of a processing circuit 90 when the processing circuit included in the transmission device 100 according to the present embodiment is realized by the processor 91 and the memory 92.
  • the processing circuit 90 shown in FIG. 21 is a control circuit and includes a processor 91 and a memory 92.
  • each function of the processing circuit 90 is realized by software, firmware, or a combination of software and firmware.
  • the software or firmware is written as a program and stored in the memory 92.
  • each function is realized by the processor 91 reading and executing the program stored in the memory 92.
  • the processing circuit 90 includes a memory 92 for storing a program in which the processing of the transmission device 100 is to be executed as a result. It can be said that this program is a program for causing the transmission device 100 to execute each function realized by the processing circuit 90.
  • This program may be provided by a storage medium in which the program is stored, or may be provided by other means such as a communication medium.
  • the time shift unit 160 generates a block-based signal in which the synchronization chap signal is patrolled and time-shifted, and generates the same number of known sequences consisting of signals of a plurality of blocks as the number of transmitting antennas.
  • Each of the step and the waveform shaping and synthesizing unit 170 having the same number of transmitting antennas is connected to different transmitting antennas 180, and the transmission line coded data series and the known series are synthesized and different by the transmission line coding unit 140. It can be said that this is a program for causing the transmission device 100 to execute the fifth step of generating a transmission signal and transmitting the transmission signal from the transmission antenna 180.
  • the processor 91 is, for example, a CPU (Central Processing Unit), a processing device, a computing device, a microprocessor, a microcomputer, a DSP (Digital Signal Processor), or the like.
  • the memory 92 is, for example, non-volatile or volatile such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), and EPROM (registered trademark) (Electrically EPROM). This includes semiconductor memory, magnetic discs, flexible discs, optical discs, compact discs, mini discs, DVDs (Digital Versatile Disc), and the like.
  • FIG. 22 is a diagram showing an example of a processing circuit 93 when the processing circuit included in the transmission device 100 according to the present embodiment is configured with dedicated hardware.
  • the processing circuit 93 shown in FIG. 22 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 thereof. The thing is applicable.
  • the processing circuit a part may be realized by dedicated hardware and a part may be realized by software or firmware.
  • the processing circuit can realize each of the above-mentioned functions by the dedicated hardware, software, firmware, or a combination thereof.
  • the receiving device 200 is also realized by the same hardware configuration as the transmitting device 100.
  • the receiving antenna 210 is an antenna element.
  • the band limiting unit 220, the timing synchronization unit 230, the despreading processing unit 240, and the demodulation unit 250 are realized by a processing circuit.
  • the processing circuit may be a processor and memory for executing a program stored in the memory, or may be dedicated hardware.
  • the transmission device 100 is a block which is a division unit obtained by dividing and shortening a known series in order to obtain a desired power gain.
  • the patrol time shift is added in block units before transmission.
  • the receiving device 200 performs cross-correlation processing using the known series before the patrol time shift for each block, and synthesizes the plurality of correlation value peaks obtained as the processing results in consideration of the patrol time shift. Accurate timing synchronization is performed by correlation processing of only the block length.
  • the transmitting device 100 transmits a signal using a plurality of transmitting antennas 180 in the spread spectrum communication method
  • the receiving device 200 performs accurate timing synchronization while suppressing an increase in the circuit scale of the timing synchronization processing. It can be carried out.
  • the configuration shown in the above embodiments is an example, and can be combined with another known technique, can be combined with each other, and does not deviate from the gist. It is also possible to omit or change a part of the configuration.
  • 100 transmitter 110 modulation unit, 120 chirp signal generation unit, 130 diffusion processing unit, 140 transmission line coding unit, 150 synchronization chirp signal generation unit, 160 time shift unit, 170-1,170-2 waveform shaping and synthesizing unit.
  • 180-1, 180-2 transmitting antenna 200 receiving device, 210 receiving antenna, 220 band limiting unit, 230 timing synchronization unit, 231 correlation series generation unit, 232 correlation processing unit, 233 inter-block synthesis unit, 234 intra-block synthesis.
  • Unit 235 peak detection unit, 240 reverse diffusion processing unit, 250 demodulation unit, 300 spectrum diffusion communication system.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

L'invention concerne un dispositif de transmission (100) comprenant : une unité de traitement d'étalement (130) qui exécute un processus d'étalement dans lequel un signal modulé obtenu par modulation d'une séquence de bits de transmission est multiplié par une séquence d'étalement ; une unité de codage de canal (140) qui effectue un codage de canal sur le signal traité par étalement d'après le nombre d'antennes de transmission ; une unité de génération de signal de puce de synchronisation (150) qui génère un signal de puce de synchronisation pour une synchronisation temporelle dans un dispositif de réception ; une unité de décalage temporel (160) qui génère des signaux d'unités de bloc obtenues en effectuant un décalage temporel cyclique du signal de puce de synchronisation afin de générer autant de séquences connues qu'il y a d'antennes de transmission, chaque séance étant constituée de signaux d'une pluralité de blocs ; et autant d'unités de mise en forme/combinaison de forme d'onde (170-1, 170-2) qu'il y a d'antennes de transmission, les unités de mise en forme/combinaison de forme d'onde étant connectées à différentes antennes de transmission (180-1, 180-2) et combinant une séquence de données codée par canal par l'unité de codage de canal (140) avec les séquences connues afin de générer et de transmettre différents signaux de transmission à partir des antennes de transmission (180-1 180-2).
PCT/JP2020/042214 2020-11-12 2020-11-12 Dispositif de transmission, dispositif de réception, système de communication à spectre étalé, circuit de commande, support de stockage, procédé de transmission et procédé de réception WO2022102042A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/JP2020/042214 WO2022102042A1 (fr) 2020-11-12 2020-11-12 Dispositif de transmission, dispositif de réception, système de communication à spectre étalé, circuit de commande, support de stockage, procédé de transmission et procédé de réception
JP2022561772A JP7199619B2 (ja) 2020-11-12 2020-11-12 送信装置、受信装置、スペクトル拡散通信システム、制御回路、記憶媒体、送信方法および受信方法
TW110123084A TW202220395A (zh) 2020-11-12 2021-06-24 送訊裝置、收訊裝置、擴展頻譜通訊系統、控制電路、記憶媒體、送訊方法及收訊方法

Applications Claiming Priority (1)

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PCT/JP2020/042214 WO2022102042A1 (fr) 2020-11-12 2020-11-12 Dispositif de transmission, dispositif de réception, système de communication à spectre étalé, circuit de commande, support de stockage, procédé de transmission et procédé de réception

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11313009A (ja) * 1998-04-24 1999-11-09 Nec Corp チャープ信号による受信同期装置
JP2003532311A (ja) * 2000-03-05 2003-10-28 イトラン コミュニケーションズ リミテッド 差分符号シフトキーイングを利用するスペクトラム拡散通信システム
JP2019021964A (ja) * 2017-07-11 2019-02-07 日本無線株式会社 通信システム及び通信方法
JP2019536390A (ja) * 2016-10-24 2019-12-12 フラウンホッファー−ゲゼルシャフト ツァ フェルダールング デァ アンゲヴァンテン フォアシュンク エー．ファオ 電文分割方法に基づいて低電力消費量を持つセンサーネットワークのためのプリアンブルとデータフィールドとの最適な結合

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11313009A (ja) * 1998-04-24 1999-11-09 Nec Corp チャープ信号による受信同期装置
JP2003532311A (ja) * 2000-03-05 2003-10-28 イトラン コミュニケーションズ リミテッド 差分符号シフトキーイングを利用するスペクトラム拡散通信システム
JP2019536390A (ja) * 2016-10-24 2019-12-12 フラウンホッファー−ゲゼルシャフト ツァ フェルダールング デァ アンゲヴァンテン フォアシュンク エー．ファオ 電文分割方法に基づいて低電力消費量を持つセンサーネットワークのためのプリアンブルとデータフィールドとの最適な結合
JP2019021964A (ja) * 2017-07-11 2019-02-07 日本無線株式会社 通信システム及び通信方法

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