WO2022190589A1 - 受信装置およびその受信方法 - Google Patents

受信装置およびその受信方法 Download PDF

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Publication number
WO2022190589A1
WO2022190589A1 PCT/JP2021/048928 JP2021048928W WO2022190589A1 WO 2022190589 A1 WO2022190589 A1 WO 2022190589A1 JP 2021048928 W JP2021048928 W JP 2021048928W WO 2022190589 A1 WO2022190589 A1 WO 2022190589A1
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WIPO (PCT)
Prior art keywords
signals
signal
correlation value
receiving
correlation
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Ceased
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PCT/JP2021/048928
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English (en)
French (fr)
Japanese (ja)
Inventor
健太郎 中原
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Sony Semiconductor Solutions Corp
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Sony Semiconductor Solutions Corp
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Priority to JP2023505134A priority Critical patent/JPWO2022190589A1/ja
Publication of WO2022190589A1 publication Critical patent/WO2022190589A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04B1/7073—Synchronisation aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This technology relates to a receiving device. More specifically, the present invention relates to a receiving device for receiving frames transmitted according to predetermined transmission parameters, and a receiving method thereof.
  • LPWA Low Power Wide Area
  • LPWA communication is wireless communication that enables data transmission over a wide range of several tens of kilometers in radius while suppressing power consumption of terminals.
  • each transmitter repeatedly transmits a control frame, which is information for notifying the receiver that it exists within the reception area, at a predetermined cycle (for example, patent Reference 1).
  • the transmitter side transmits frames according to predetermined transmission parameters, and the receiver side receives frames using the transmission parameters of each transmitter.
  • the receiver cannot know the transmission parameters before receiving the control frame, the multiplexed signal will be subjected to reception processing one by one, resulting in a heavy load.
  • This technology was created in view of this situation, and aims to reduce the load of receiving control frames.
  • the present technology has been made to solve the above-mentioned problems, and the first aspect thereof is to receive a plurality of signals multiplexed at a plurality of positions in the time direction and a plurality of channels in the frequency direction.
  • a reception unit a correlation generation unit that generates a correlation value between each of the plurality of signals and a predetermined known symbol, and a signal selection unit that selects one of the plurality of signals whose correlation value satisfies a predetermined condition
  • a receiving device and a receiving method thereof comprising a signal demodulator that performs demodulation processing on the selected signal. This brings about the effect of performing the demodulation processing on the signal whose correlation value satisfies a predetermined condition.
  • the signal selection unit may select only a predetermined number of signals having the highest correlation value among the plurality of signals. Further, the signal selection section may select only the signals whose correlation value exceeds a predetermined threshold among the plurality of signals.
  • the known symbol may be a set of synchronization bits included in each of the plurality of signals. Also, the known symbol may be a set of guard bits included in each of the plurality of signals. Further, the known symbol may be part of either a set of synchronization bits or a set of guard bits included in each of the plurality of signals.
  • the plurality of signals may not include a preamble.
  • a time information receiving unit that receives time information may be further provided. This brings about an effect that the receiving section receives a plurality of signals in synchronization with the time information.
  • FIG. 1 is a diagram showing an example of the overall configuration of a communication system according to an embodiment of the present technology.
  • This communication system is a system assuming LPWA communication, and includes a transmitter 100 and a receiver 200.
  • the transmitter 100 is a communication device that transmits signals
  • the receiver 200 is a communication device that receives signals.
  • Transmitter 100 transmits signals via antenna 101 and receiver 200 receives signals via antenna 201 .
  • transmitter 100 and receiver 200 receive time information via antennas 109 and 209, respectively.
  • information contained in a GPS signal from a GPS (Global Positioning System) satellite 300 is used as time information.
  • the transmitter 100 and the receiver 200 can time-synchronize with each other with very high accuracy (for example, about ⁇ 100 microseconds) without transmitting a preamble to be described later. .
  • FIG. 2 is a diagram showing an example of the configuration of the receiver 200 according to the embodiment of the present technology.
  • the receiver 200 mainly includes an LPWA receiving section 210 and a GPS receiving section 290 .
  • the LPWA receiver 210 receives LPWA communication signals, and the GPS receiver 290 receives GPS signals.
  • the LPWA receiving section 210 includes a low noise amplifier 211 , a bandpass filter 212 , a phase synchronization circuit 213 , a mixer 214 , a lowpass filter 215 and an AD conversion section 216 .
  • the LPWA receiver 210 also includes a synchronization signal generator 221 , a correlation calculator 222 , a correlation value memory 223 , a correlation value selector 224 and a demodulator 231 .
  • the low-noise amplifier 211, the bandpass filter 212, the phase synchronization circuit 213, the mixer 214, the lowpass filter 215, and the AD converter 216 are examples of the receiver described in the claims.
  • a low noise amplifier (LNA) 211 is an amplifier that amplifies the signal received via the antenna 201 .
  • a band pass filter (BPF) 212 is a filter that limits the band of the signal amplified by the low noise amplifier 211 .
  • the phase locked loop (PLL) 213 oscillates according to the signal supplied from the GPS receiver 290 and generates a carrier signal (carrier wave) with a predetermined frequency used for transmission and reception.
  • a mixer 214 mixes the output of the bandpass filter 212 and the output of the phase synchronization circuit 213 .
  • a low pass filter (LPF) 215 attenuates high frequency components in the output of the mixer 214 .
  • An AD converter Analog-to-Digital Converter 216 converts the output of the low-pass filter 215 from an analog signal to a digital signal.
  • the synchronization signal generator 221 generates a synchronization signal with a pattern specified by the synchronization pattern information supplied from the GPS receiver 290 .
  • the correlation calculation section 222 compares the received signal supplied from the AD conversion section 216 and the synchronization signal supplied from the synchronization signal generation section 221, and outputs a correlation value indicating the comparison result. Note that the correlation calculator 222 is an example of the correlation generator described in the claims.
  • the correlation value memory 223 is a memory that holds the correlation values output from the correlation calculator 222 .
  • the correlation value selection unit 224 selects correlation values that satisfy a predetermined condition from the correlation values held in the correlation value memory 223 .
  • the correlation value selector 224 is an example of the signal selector described in the claims.
  • the demodulator 231 demodulates the signal from the AD converter 216 corresponding to the correlation value selected by the correlation value selector 224 .
  • the demodulator 231 is an example of the signal demodulator described in the claims.
  • the GPS receiver 290 includes a low noise amplifier 291, a temperature compensated crystal oscillator 292, and a GPS receiver 293.
  • the GPS receiver 290 is an example of the time information receiver described in the claims.
  • a low noise amplifier (LNA) 291 is an amplifier that amplifies the signal received via the antenna 209 .
  • a Temperature Compensated Crystal Oscillator (TCXO) 292 is a crystal oscillator that includes circuitry that compensates for constant frequency over temperature changes.
  • the GPS receiver 293 performs reception processing on the signal amplified by the low noise amplifier 291 .
  • FIG. 3 is a diagram showing an example of frame configurations transmitted and received in an embodiment of the present technology.
  • a total of 832 bits of synchronization signal (SYNC) 710 are provided in one frame.
  • the synchronization signal 710 is an example of the synchronization bit described in the claims.
  • This frame also includes a total of 1656 bits of encoded data 730 and two guard bits 720 and 740 of 4 bits each.
  • PPDU Physical Layer Convergence Protocol Data Unit
  • the synchronization signals 710 are arranged interspersed in the frame.
  • one out of three symbols is the synchronization signal 710 . Therefore, all synchronization signals 710 are collected at the end of the frame.
  • FIG. 4 is a diagram showing an example of time multiplexing of frames transmitted and received in the embodiment of the present technology.
  • PPDU 700 is transmitted every 8 milliseconds.
  • FIG. 5 is a diagram showing an example of frequency multiplexing of frames transmitted and received in the embodiment of the present technology.
  • the chirp-modulated PPDU 700 is transmitted at 625 grid positions within a 5 second frame period. Then, this transmission is repeated four times, and is transmitted over a total of 20 seconds.
  • multiplexing is performed in the frequency direction, and in this example, transmission is performed simultaneously by 23 frequency channels (Ch39 to Ch61).
  • correlation calculation section 222 performs FFT (Fast Fourier Transform) to generate the spectrum of synchronization signal 710, and obtains the maximum value of this spectrum as the correlation value.
  • FFT Fast Fourier Transform
  • FIG. 6 is a diagram showing a processing procedure example of a reception operation by the receiver 200 according to the embodiment of the present technology.
  • the receiver 200 captures the frame in the LPWA receiving section 210 (step S911). That is, a signal received via an antenna 201 is amplified by a low noise amplifier 211, passed through a bandpass filter 212 and the like, and converted into a digital signal by an AD converter 216.
  • a signal received via an antenna 201 is amplified by a low noise amplifier 211, passed through a bandpass filter 212 and the like, and converted into a digital signal by an AD converter 216.
  • the correlation calculator 222 extracts and detects the synchronization signal 710 from the converted digital signal to generate a correlation value (step S912).
  • This correlation value is obtained, for example, as the maximum of the spectrum generated by the FFT, as described above.
  • the generated correlation values are stored in the correlation value memory 223 .
  • the correlation value selection unit 224 selects the correlation values obtained in this way that satisfy a predetermined condition (loop L920). As a criterion in this case, for example, the N items having the highest correlation value may be selected, or a correlation value exceeding a predetermined threshold may be selected.
  • the demodulator 231 demodulates the frame corresponding to the selected correlation value (step S921). Since this frame demodulation process executes a wide variety of algorithms, it is difficult to implement with hardware such as ASIC and FPGA. For example, an SDR (Software Defined Radio) receiver that processes signals by software is likely to be implemented by a processor, increasing the processing load. Therefore, the processing efficiency can be improved by demodulating only the frames whose correlation values satisfy a predetermined criterion instead of demodulating all frames.
  • SDR Software Defined Radio
  • control frames exist in about 500 to 1000 out of a total of 14375 signal positions with 625 grid positions and 23 frequency channels.
  • the load required for frame demodulation is improved by ten times or more.
  • the frame to be demodulated was detected using the correlation value of the synchronization signal 710 within the frame.
  • this synchronization signal 710 is an example of known symbols, and other signals may be used as known symbols.
  • the correlation values of guard bits 720 and 740 may be used to detect frames to be demodulated.
  • the processing procedure described in the above embodiment may be regarded as a method having a series of procedures, and a program for causing a computer to execute the series of procedures or a recording medium for storing the program You can catch it.
  • this recording medium for example, CD (Compact Disc), MD (MiniDisc), DVD (Digital Versatile Disc), memory card, Blu-ray disc (Blu-ray (registered trademark) Disc), etc. can be used.
  • the present technology can also have the following configuration.
  • a receiving unit that receives a plurality of signals multiplexed at a plurality of positions in the time direction and a plurality of channels in the frequency direction; a correlation generator that generates a correlation value with a predetermined known symbol for each of the plurality of signals; a signal selection unit that selects, from among the plurality of signals, one whose correlation value satisfies a predetermined condition; and a signal demodulator that performs demodulation processing on the selected signal.
  • the signal selection unit selects only a predetermined number of signals having the highest correlation value among the plurality of signals.
  • the signal selection unit selects only those signals whose correlation value exceeds a predetermined threshold among the plurality of signals.
  • the known symbol is a set of synchronization bits included in each of the plurality of signals.
  • the known symbol is a set of guard bits included in each of the plurality of signals.
  • the known symbol is a part of either a set of synchronization bits or a set of guard bits included in each of the plurality of signals. .
  • the receiving device according to any one of (1) to (6), wherein the plurality of signals do not include preambles.
  • (8) further comprising a time information receiving unit for receiving time information; The receiving device according to any one of (1) to (7), wherein the receiving unit receives the plurality of signals in synchronization with the time information.
  • (9) a procedure in which the receiving unit receives a plurality of signals multiplexed at a plurality of positions in the time direction and a plurality of channels in the frequency direction; a procedure in which a correlation generator generates a correlation value with a predetermined known symbol for each of the plurality of signals; a procedure in which the signal selection unit selects one of the plurality of signals in which the correlation value satisfies a predetermined condition;
  • a receiving method for a receiving device comprising: a step in which a signal demodulator demodulates the selected signal.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
PCT/JP2021/048928 2021-03-08 2021-12-28 受信装置およびその受信方法 Ceased WO2022190589A1 (ja)

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Cited By (1)

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WO2024203102A1 (ja) * 2023-03-30 2024-10-03 ソニーセミコンダクタソリューションズ株式会社 送信装置および送信方法、並びに、受信装置および受信方法

Citations (1)

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WO2019230439A1 (ja) * 2018-05-31 2019-12-05 ソニーセミコンダクタソリューションズ株式会社 情報処理装置、情報処理方法、送信機、送信方法、受信機、受信方法

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JP4346465B2 (ja) * 2003-09-29 2009-10-21 三洋電機株式会社 受信方法および装置
JP2006052054A (ja) * 2004-08-11 2006-02-23 Olympus Corp 画像形成装置の媒体搬送装置、方法、プログラム
CN107852190B (zh) * 2016-06-08 2022-08-05 索尼半导体解决方案公司 信息处理装置和方法、发送装置和方法、接收装置和方法

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WO2019230439A1 (ja) * 2018-05-31 2019-12-05 ソニーセミコンダクタソリューションズ株式会社 情報処理装置、情報処理方法、送信機、送信方法、受信機、受信方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024203102A1 (ja) * 2023-03-30 2024-10-03 ソニーセミコンダクタソリューションズ株式会社 送信装置および送信方法、並びに、受信装置および受信方法

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