WO2014020802A1 - Appareil radio, procédé de communication associé et support lisible par ordinateur - Google Patents

Appareil radio, procédé de communication associé et support lisible par ordinateur Download PDF

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Publication number
WO2014020802A1
WO2014020802A1 PCT/JP2013/002818 JP2013002818W WO2014020802A1 WO 2014020802 A1 WO2014020802 A1 WO 2014020802A1 JP 2013002818 W JP2013002818 W JP 2013002818W WO 2014020802 A1 WO2014020802 A1 WO 2014020802A1
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WIPO (PCT)
Prior art keywords
value
autocorrelation
received signal
signal
peak value
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PCT/JP2013/002818
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English (en)
Japanese (ja)
Inventor
拓志 望月
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日本電気株式会社
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Priority to JP2014527951A priority Critical patent/JP5854144B2/ja
Publication of WO2014020802A1 publication Critical patent/WO2014020802A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H04L27/2663—Coarse synchronisation, e.g. by correlation

Definitions

  • the present invention can derive the input level of the true desired received signal with high accuracy even under external interference wave and interference wave input, and further suppresses errors in automatic gain control according to the input level.
  • the present invention relates to a radio apparatus capable of receiving a desired signal in various levels, a communication method thereof, and a computer-readable medium.
  • the wireless device for example, when an interference wave signal or interference wave signal transmitted from another system is mixed in the reception signal, a measurement error occurs with respect to the true reception signal level as described above, or automatic An error may occur in gain control.
  • a measurement error occurs with respect to the true reception signal level as described above, or automatic An error may occur in gain control.
  • the time multiplexing of symbols unique to the UWB method was used.
  • a wireless device that detects Symbol ⁇ ⁇ Timing and corrects reception synchronization by autocorrelation is known (see Patent Document 2), but has a different configuration and purpose from the present invention.
  • a main object is to provide a radio apparatus, a communication method thereof, and a computer-readable medium capable of receiving a desired wave in an optimum level situation by suppressing an error in automatic gain control according to the input level.
  • One aspect of the present invention for achieving the above object is a radio apparatus that receives an orthogonal frequency division multiplex signal and performs automatic gain control on the received signal, the peak value of the autocorrelation value of the received signal.
  • Autocorrelation means for calculating the signal, determination means for determining whether or not the peak value of the autocorrelation value calculated by the autocorrelation means is equal to or greater than a determination threshold, and reception intensity detection for detecting the reception intensity of the received signal Means for estimating a CIR estimated value indicating a ratio of signal power to interference power based on CIR characteristic information set in advance and a peak value of the autocorrelation value calculated by the autocorrelation means;
  • the determination means determines that the peak value of the autocorrelation value is greater than or equal to the determination threshold, the reception intensity of the received signal detected by the reception intensity detection means and the estimation means
  • a correcting means for calculating a correct input level for the received signal based on the estimated CIR value, a display unit for displaying the
  • an automatic gain control means for performing the automatic gain control is provided.
  • an aspect of the present invention for achieving the above object is a communication method for a radio apparatus that receives an orthogonal frequency division multiplex signal and performs automatic gain control on the received signal.
  • a step of calculating an input level of the received signal based on the received intensity of the received signal detected when it is determined to be present and the estimated CIR estimated value; And displaying, may be a communication method for a radio apparatus, characterized in that it comprises the step of performing the automatic gain control based on the input level of the calculated received signal.
  • one aspect of the present invention for achieving the above object is a communication program for a radio apparatus that receives an orthogonal frequency division multiplex signal and performs automatic gain control on the received signal.
  • a process of calculating a peak value of the correlation value, a process of determining whether or not the calculated peak value of the autocorrelation value is equal to or greater than a determination threshold, a peak value of the calculated autocorrelation value, and a preset value Processing for estimating a CIR estimated value indicating a ratio of signal power to interference power based on the CIR characteristic information, and a received signal detected when the peak value of the autocorrelation value is determined to be equal to or greater than a determination threshold value
  • a process of calculating the input level of the received signal based on the estimated CIR estimated value a process of displaying the input level to the user, and the calculated input level of the received signal
  • It may be a communication program of the wireless device, characterized in that to execute a process of performing the automatic gain control to the computer based.
  • the present invention it is possible to derive the input level of the true desired received signal with high accuracy even under an external disturbance wave or interference wave input, and further to suppress errors in automatic gain control by the input level. It is possible to provide a radio apparatus capable of receiving a desired wave in an optimum level situation, a communication method thereof, and a computer-readable medium.
  • 1 is a block diagram showing a schematic system configuration of a wireless device according to an embodiment of the present invention. It is a figure which shows the symbol format of an OFDM received signal. 1 is a block diagram showing a schematic system configuration of an autocorrelator according to an embodiment of the present invention. It is a figure which shows an example of the CIR characteristic information which shows the correlation of an autocorrelation peak value and CIR.
  • FIG. 1 is a functional block diagram of a radio apparatus according to an embodiment of the present invention.
  • Radio apparatus 1 receives an orthogonal frequency division multiplex signal and performs automatic gain control on the received signal.
  • the radio apparatus 1 has an autocorrelation unit 2 that calculates a peak value of an autocorrelation value of a received signal, and a determination that determines whether or not the peak value of the autocorrelation value calculated by the autocorrelation unit 2 is equal to or greater than a determination threshold.
  • reception intensity detection means 4 for detecting the reception intensity of the received signal, peak value of the autocorrelation value calculated by the autocorrelation means 2, and signal power with respect to the interference power based on preset CIR characteristic information
  • the estimation means 5 for estimating the CIR estimation value indicating the ratio of the received signal and the reception of the received signal detected by the reception intensity detection means 4 when the determination means 3 determines that the peak value of the autocorrelation value is greater than or equal to the determination threshold.
  • a correction means 6 for calculating the input level of the received signal based on the intensity and the CIR estimated value estimated by the estimation means 5; an automatic gain based on the input level of the received signal calculated by the correction means 6;
  • An automatic gain control means 7 for controlling.
  • the optimum AGC gain can be set. That is, it is possible to perform communication with high accuracy while suppressing errors in automatic gain control.
  • FIG. 2 is a block diagram showing a schematic system configuration of a radio apparatus according to an embodiment of the present invention.
  • a radio apparatus 10 according to the present embodiment includes an antenna 11, an amplifier 12, a mixer 13, a local oscillator 14, a variable gain unit 15, an A / D converter 16, a low-pass filter 17, and a GI removal.
  • the wireless device 10 stores, for example, a CPU (Central Processing Unit) that performs control processing, calculation processing, and the like, a ROM (Read Only Memory) that stores a control program executed by the CPU, a calculation program, processing data, and the like.
  • the microcomputer is composed mainly of a microcomputer composed of RAM (Random Access Memory) or the like for temporary storage.
  • the CPU, ROM, and RAM are connected to each other via a data bus or the like.
  • the antenna 11 is a specific example of antenna means, and receives, for example, an OFDM (Orthogonal Frequency Division Multiplexing) reception signal, a noise wave signal, an interference wave signal, an interference wave signal, or the like.
  • the antenna 11 outputs the received signal to the amplifier 12.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the amplifier 12 is a specific example of an amplifying unit, and is, for example, an LNA (Low Noise Amplifier), which amplifies the signal output from the antenna 11 and outputs the amplified signal to the mixer 13.
  • LNA Low Noise Amplifier
  • the mixer 13 is a specific example of mixing means, and mixes the signal output from the amplifier 12 and the signal output from the local oscillator 14 and outputs the mixed signal to the variable gain unit 15.
  • a quadrature demodulator QDEM may be used instead of the mixer 13, a quadrature demodulator (QDEM) may be used.
  • the local oscillator 14 generates a reference signal (an example of a predetermined reference signal) at a predetermined frequency and outputs the reference signal to the mixer 13.
  • a reference signal an example of a predetermined reference signal
  • the variable gain unit 15 is a specific example of variable gain means, and varies the gain of the built-in amplifier according to an AGC (Automatic Gain Control) control voltage output from the AGC controller 27. Thereby, even when the input level of the received signal fluctuates, the output level can be kept constant.
  • the variable gain unit 15 outputs an IF (Intermediate Frequency) signal to the A / D converter 16.
  • An A / D converter (ADC: Analog Digital Converter) 16 is a specific example of A / D conversion means, converts an analog signal output from the variable gain unit 15 into a digital signal, a low-pass filter 17, an autocorrelation Output to the device 21 and the RSSI unit 24.
  • the reception signal received by the antenna 11 is converted into a digital signal in the baseband region through the amplifier 12, the mixer 13, the variable gain unit 15, and the A / D converter 16 as described above.
  • the low-pass filter 17 passes a signal having a predetermined frequency or less from the digital signal output from the A / D converter 16 and outputs the signal to the GI removal unit 18.
  • the GI removing unit 18 removes a GI (Guard Interval) from the signal output from the low-pass filter 17 and outputs the GI (Guard Interval) to the FFT unit 19.
  • An FFT (Fast Transform) unit 19 performs a Fourier transform process on the signal output from the GI removal unit 18 and outputs the result to the demodulator 20. Note that the digital signal in the baseband region output from the A / D converter 16 is converted into primary modulated waves of a plurality of subcarriers via the low-pass filter 17, the GI removal unit 18, and the FFT unit 19, as described above. The frequency is decomposed and input to the demodulator 20.
  • the demodulator 20 performs demodulation processing on the signal output from the FFT unit 19.
  • the RSSI unit 24 is a specific example of reception strength detection means, detects an RSSI (Received Signal Strength Indication) value from the signal output from the A / D converter 16, and Output.
  • the autocorrelator 21 is a specific example of the autocorrelation means, and performs autocorrelation processing on the signal output from the A / D converter 16.
  • FIG. 3 is a diagram showing a symbol format of the OFDM received signal.
  • the autocorrelator 21 performs autocorrelation processing as will be described later, focusing on the periodicity of the GI copy in each symbol (Symbol) in the OFDM received signal.
  • FIG. 4 is a block diagram showing a schematic system configuration of the autocorrelator according to the present embodiment.
  • the autocorrelator 21 according to the present embodiment includes a delay unit 211 and an autocorrelation calculator 212.
  • the delay unit 211 delays the signal output from the A / D converter 16 and outputs the delayed signal to the autocorrelation calculator 212 as a delayed wave signal.
  • the autocorrelation calculator 212 calculates the autocorrelation between the delayed wave signal output from the delay unit 211 and the main wave signal output from the A / D converter 16, and the peak value of the autocorrelation value (hereinafter referred to as autocorrelation). (Referred to as a peak value).
  • the autocorrelation calculator 212 outputs the calculated autocorrelation peak value to the determiner 22.
  • the determiner 22 is a specific example of a determination unit, and determines whether or not the autocorrelation peak value output from the autocorrelation calculator 212 is equal to or greater than a determination threshold value.
  • the determiner 22 outputs an ON signal to the switch unit 25 when determining that the autocorrelation peak value is greater than or equal to the determination threshold.
  • the determiner 22 outputs an off signal to the switch unit 25 when determining that the autocorrelation peak value is smaller than the determination threshold.
  • the switch unit 25 is a specific example of a switch unit, and is turned on in response to an on signal from the determiner 22, and outputs the RSSI value output from the RSSI unit 24 to the RSSI corrector 26. On the other hand, the switch unit 25 is turned off in response to the off signal from the determiner 22 and does not output the RSSI value output from the RSSI unit 24 to the RSSI corrector 26.
  • the determiner 22 controls the delay amount by outputting a control signal to the delay unit 211. For example, when the determination unit 22 determines that the autocorrelation peak value exceeds the determination threshold, the determination unit 22 performs delay amount control so that the delay amount of the delay unit 211 is held while the autocorrelation peak value is equal to or greater than the determination threshold.
  • ⁇ Determinator 22 outputs the autocorrelation peak value from autocorrelator 21 to CIR estimator 23.
  • a CIR (Carrier-to-Interference-Ratio) estimator 23 is a specific example of an estimator, and is based on the autocorrelation peak value output from the determiner 22 and preset CIR characteristic information.
  • a CIR estimated value [dB] indicating the ratio of signal power is estimated.
  • the CIR characteristic information is, for example, information indicating the correlation between the autocorrelation peak value and the CIR as shown in FIG.
  • the CIR estimator 23 outputs the estimated CIR estimated value to the RSSI corrector 26.
  • the RSSI corrector 26 outputs the calculated received signal input level to the AGC controller 27 and the display 28.
  • the AGC controller 27 is a specific example of the automatic gain control means, generates an AGC control voltage for controlling the variable gain unit 15 based on the received signal input level output from the RSSI corrector 26, and is variable. Output to the gain unit 15.
  • the gain of the variable gain device 15 is not affected by noise such as noise waves, interference waves, and interference waves, and is based on the true received signal input level and the gain from the antenna 11 to the A / D converter 16.
  • the AGC control is performed so that the received signal level after the A / D converter 16 is within a certain range.
  • the display 28 displays the received signal input level output from the RSSI corrector 26 to the user as a reception status report.
  • the display device 28 includes, for example, a liquid crystal display device, an organic or inorganic EL display device, and a display on a computer externally connected to the device.
  • radio apparatus 10 for example, there are interference wave signals, jamming wave signals, and the like from other systems that interfere with reception signal input level constantly rising. Even in this case, the optimum AGC gain can be set based on the true received signal input level.
  • the gain setting is performed in the variable gain unit 15 so as not to saturate the A / D converter 16 over the entire interference level. Demodulation is performed while allowing degradation of in-band interference.
  • gain control is performed in the variable gain unit 15 using the true received signal, and the level convergence after the A / D converter 16 should be set to the optimum level. AGC control is performed. For this reason, the received signal can be guided to the A / D converter 16 and later in the highest C / N state. That is, it is possible to perform communication with high accuracy while suppressing errors in automatic gain control.
  • the present invention also includes the amplifier 12, the mixer 13, the local oscillator 14, the variable gain unit 15, the A / D converter 16, the low-pass filter 17, the GI removing unit 18, the FFT unit 19, the demodulator 20, and the autocorrelator. 21, the determination unit 22, the CIR estimator 23, the RSSI unit 24, the switch unit 25, the RSSI corrector 26, the AGC controller 27, and the like can be realized by causing the CPU to execute a computer program. is there.
  • Non-transitory computer readable media include various types of tangible storage media (tangible storage medium).
  • Examples of non-transitory computer-readable media include magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable ROM), flash ROM, RAM (random access memory)) are included.
  • the program may be supplied to the computer by various types of temporary computer readable media.
  • Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
  • the temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
  • a radio apparatus that receives an orthogonal frequency division multiplexed signal and performs automatic gain control on the received signal, Autocorrelation means for calculating a peak value of the autocorrelation value of the received signal; Determination means for determining whether or not the peak value of the autocorrelation value calculated by the autocorrelation means is greater than or equal to a determination threshold; Reception intensity detection means for detecting the reception intensity of the received signal; Estimating means for estimating a CIR estimated value indicating a ratio of signal power to interference power based on a peak value of the autocorrelation value calculated by the autocorrelation means and preset CIR characteristic information; The reception intensity of the received signal detected by the reception intensity detection means when the determination means determines that the peak value of the autocorrelation value is greater than or equal to the determination threshold, and the CIR estimation value estimated by the estimation means Correction means for calculating the input level of the received signal based on the display, display means for displaying the correction input level to the user,
  • a radio apparatus comprising: automatic
  • the radio apparatus according to claim 1, wherein the autocorrelation means calculates a peak value of the autocorrelation value in the received signal using a periodicity of a guard interval copy in a plurality of symbols.
  • the autocorrelation means includes A delay unit that delays the digitized received signal to generate a delayed wave signal; An autocorrelation calculator that calculates a peak value of the autocorrelation value by performing autocorrelation between the delayed wave signal from the delayer and the main wave signal that is the digitized reception signal;
  • a wireless device comprising: (Appendix 4) A wireless device according to any one of (Appendix 1) to (Appendix 3), In the CIR characteristic information, as the intensity of the peak value of the autocorrelation value of the received signal increases, the D / U ratio of the interference wave (Interferer) is ensured as compared with the desired received signal (Carrier), and the CIR value is A
  • (Appendix 5) A wireless device according to any one of (Appendix 1) to (Appendix 4), When the determination means determines that the peak value of the autocorrelation value is greater than or equal to a determination threshold, the ON state outputs the reception strength of the received signal from the reception strength detection means to the correction means, and the determination means When it is determined that the peak value of the autocorrelation value is smaller than a determination threshold value, switch means for switching to an off state in which the reception intensity of the received signal from the reception intensity detection means is not output to the correction means is further provided.
  • (Appendix 6) A wireless device according to any one of (Appendix 1) to (Appendix 5), Antenna means for receiving the received signal; Amplifying means for amplifying the received signal received by the antenna means; Mixing means for mixing the received signal amplified by the amplifying means with a predetermined reference signal; Variable gain means for varying the gain according to a control signal from the automatic gain control means, and varying the signal mixed by the mixing means; A / D conversion means for converting the analog signal variable by the variable gain means into a digital signal, The radio apparatus according to claim 1, wherein the autocorrelation means calculates a peak value of an autocorrelation value for the digital signal from the A / D conversion means.
  • a communication program for a wireless device that receives an orthogonal frequency division multiplex signal and performs automatic gain control on the received signal, Processing for calculating a peak value of the autocorrelation value of the received signal; A process for determining whether or not a peak value of the calculated autocorrelation value is equal to or greater than a determination threshold; A process of estimating a peak value of the calculated autocorrelation value and a CIR estimation value indicating a ratio of signal power to interference power based on preset CIR characteristic information; A process of calculating a reception intensity of a received signal detected when it is determined that a peak value of the autocorrelation value is equal to or greater than a determination threshold, and an input level of the received signal based on the estimated CIR estimated value; , Displaying that input level to the user, A wireless device communication program causing a computer to execute a process of performing the automatic gain control based on the calculated input level of the received signal.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

La présente invention concerne un appareil radio qui reçoit des signaux OFDM et applique une commande de gain automatique aux signaux reçus. Selon l'invention, l'appareil radio comprend : un moyen d'autocorrélation qui calcule la valeur de crête de la valeur d'autocorrélation d'un signal reçu ; un moyen de détection d'intensité de réception qui détecte l'intensité de réception du signal reçu ; un moyen d'estimation qui estime une valeur d'estimation CIR sur la base à la fois de la valeur de crête de la valeur d'autocorrélation calculée par le moyen d'autocorrélation et des informations de caractéristiques CIR prédéterminées ; un moyen de correction qui, lorsqu'un moyen de détermination détermine que la valeur de crête de la valeur d'autocorrélation est égale ou supérieure à une valeur seuil de détermination, calcule un niveau d'entrée du signal reçu sur la base à la fois de l'intensité de réception du signal reçu détectée par le moyen de détection d'intensité de réception et de la valeur d'estimation CIR estimée par le moyen d'estimation ; une unité d'affichage qui présente le niveau d'entrée corrigé à un utilisateur ; et un moyen de commande de gain automatique qui applique une commande de gain automatique sur la base du niveau d'entrée du signal reçu calculé par le moyen de correction.
PCT/JP2013/002818 2012-07-31 2013-04-25 Appareil radio, procédé de communication associé et support lisible par ordinateur WO2014020802A1 (fr)

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CN113271620A (zh) * 2020-02-14 2021-08-17 株式会社东海理化电机制作所 通信装置、信息处理方法和计算机可读存储介质

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