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WO2009098965A1 - Récepteur ofdm - Google Patents

Récepteur ofdm Download PDF

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Publication number
WO2009098965A1
WO2009098965A1 PCT/JP2009/051210 JP2009051210W WO2009098965A1 WO 2009098965 A1 WO2009098965 A1 WO 2009098965A1 JP 2009051210 W JP2009051210 W JP 2009051210W WO 2009098965 A1 WO2009098965 A1 WO 2009098965A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission path
interpolation
interpolation circuit
frequency direction
circuit
Prior art date
Application number
PCT/JP2009/051210
Other languages
English (en)
Japanese (ja)
Inventor
Handa Chen
Original Assignee
Megachips Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Megachips Corporation filed Critical Megachips Corporation
Publication of WO2009098965A1 publication Critical patent/WO2009098965A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
    • H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
    • H04L25/0232—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols by interpolation between sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0212—Channel estimation of impulse response
    • H04L25/0216—Channel estimation of impulse response with estimation of channel length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0222—Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency
    • 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

Definitions

  • the present invention relates to a technique for estimating a transmission path function of a received signal in an OFDM transmission system.
  • an OFDM (Orthogonal Frequency Division Multiplexing) system is adopted as a transmission system.
  • the OFDM scheme is one of multicarrier transmission schemes in which transmission data is divided into a plurality of carrier waves and transmitted.
  • the spectrum of each subchannel, which is strong against frequency selective fading of a multipath transmission path, can be densely arranged, There are advantages such as high frequency utilization efficiency.
  • the ISDB-T which is the Japanese standard for terrestrial digital television broadcasting
  • the DVB-T / H which is the European standard
  • pilot data whose amplitude and phase are known is embedded.
  • the receiving device extracts pilot data from the received OFDM signal. Then, the transmission path function is calculated by comparing the pilot data extracted from the received signal with the pilot pattern held in advance.
  • the receiving apparatus estimates the transmission path function for all received data by interpolating the transmission path function calculated for the pilot data with respect to other data.
  • the receiving device equalizes the received signal by dividing the received OFDM signal by the transmission path function.
  • a terrestrial digital broadcast receiver for one-segment (one-segment reception) is also installed in mobile phones.
  • on-vehicle one-seg receivers are sold. These receiving devices for mobile phones and the like need to support reception while moving.
  • OFDM Although not limited to reception at high-speed movement, OFDM generally requires high demodulation accuracy against interference caused by multipath delay waves.
  • an OFDM receiving apparatus obtains transmission path functions for all data by interpolating transmission path functions.
  • an interpolation method of the transmission path function there are a method of interpolating the transmission path function in the time direction and a method of interpolation in the frequency direction.
  • interpolation only in the frequency direction has a problem that it is easily affected by multipath interference having a large delay. That is, there is a problem that it is vulnerable to frequency selective fading.
  • Patent Document 1 discloses a technique for estimating a transmission path by switching between a case where interpolation is performed by combining the time direction and the frequency direction and a case where interpolation is performed only in the frequency direction.
  • equalization is performed using the output of a two-dimensional interpolation filter that performs interpolation in the time direction and the frequency direction, and after the second time, the interpolation is performed in only one direction.
  • the output of the insertion filter is used. In this way, the operation of the equalizer is accelerated.
  • the OFDM receiver of the present invention uses a multipath detection unit that detects a maximum multipath delay time from a received signal, a fading detection unit that detects fading information from the received signal, and pilot data extracted from the received signal
  • a transmission path function calculation unit that calculates a transmission path function of the received signal, and a fading detected by the fading detection unit that has a maximum multipath delay time detected by the multipath detection unit that is smaller than the first threshold.
  • a switching unit that selects a first interpolation method for interpolating transmission line functions for all data by interpolation in the frequency direction when the information is equal to or greater than the second threshold.
  • High quality broadcast signals can be received even in Rayleigh fading environments accompanying high-speed movement while ensuring multipath characteristics.
  • the OFDM receiver of the present invention further includes a first interpolation circuit for interpolating the transmission path function in the frequency direction, a second interpolation circuit for interpolating the transmission path function in the frequency direction,
  • a first interpolation circuit for interpolating the transmission path function in the frequency direction
  • a second interpolation circuit for interpolating the transmission path function in the frequency direction
  • the OFDM receiver of the present invention is further arranged between the first interpolation circuit and the second interpolation circuit, and the transmission path function interpolated in the first interpolation circuit.
  • a noise removing unit for removing noise It is possible to improve the noise characteristics of the transmission path function.
  • an object of the present invention is to provide an OFDM receiver capable of demodulating a received signal with high accuracy while eliminating the influence of multipath interference and the influence of Rayleigh fading that occurs due to high-speed movement. is there.
  • FIG. 1 is a block diagram showing an OFDM receiving apparatus according to the present embodiment.
  • An RF (Radio Frequency) signal 1 transmitted from an OFDM transmitter (not shown) is received by a receiving antenna 2 through a transmission path.
  • the received RF signal is frequency-converted by the tuner 3 into an IF (Intermediate Frequency) signal.
  • the IF signal is input to the mixer 5 via the BPF (band pass filter) 4, multiplied by the signal supplied from the carrier wave oscillator 6, and then output to the LPF (low pass filter) 7.
  • BPF band pass filter
  • the reception signal from which the high-frequency component has been removed by the LPF 7 is output to the A / D converter 8, and the A / D converter 8 converts it into a digital signal (symbol signal) at a predetermined sampling frequency.
  • the received signal converted into a digital signal is converted into a parallel signal by a serial-parallel converter and then output to an FFT (Fast Fourier Transform) calculator 9.
  • the FFT calculator 9 Fourier transforms the input time domain symbol signal into a frequency domain signal (hereinafter, this signal is referred to as a received OFDM signal).
  • the received OFDM signal in the frequency domain is input to the equalizer 10 that performs waveform equalization.
  • the equalizer 10 equalizes the received OFDM signal based on the calculation result in the transmission path estimation circuit 20.
  • the transmission line estimation circuit 20 will be described later, it is a characteristic part of the present invention.
  • the received OFDM signal subjected to equalization processing in the equalizer 10 is subjected to Viterbi decoding and Reed-Solomon decoding in the channel decoder 11, and then MPEG (Moving Picture Experts Group) in the source decoder 12. -2 method or the like, the analog signal is output by the D / A converter 13 and output.
  • FIG. 2 is a block diagram of the transmission path estimation circuit 20 according to the present embodiment.
  • the multipath detection circuit 21 receives the symbol signal output from the A / D converter 8 and detects the maximum delay time of the multipath.
  • the received signal may include a plurality of delayed waves, but the multipath detection circuit 21 detects the delay time of the delayed wave that arrives the latest from the direct wave among the plurality of delayed waves.
  • the multipath detection circuit 21 calculates the multipath maximum delay time using the guard interval of the received signal.
  • the pilot extraction circuit 22 receives the received OFDM signal output from the FFT calculator 9 and extracts a pilot signal included in the received OFDM signal.
  • the pilot symbols adopted in the terrestrial digital broadcasting standards in Japan and Europe are called scattered pilot symbols (SP). As shown in FIG. 3, pilot symbols are inserted at 12 carrier intervals in the frequency direction (carrier direction). Also, the position of the carrier into which the pilot symbol is inserted is shifted by 3 carriers in the time direction.
  • the phase and amplitude of the pilot symbol are determined in advance, and the transmission path estimation circuit 20 holds the pilot pattern PP in a predetermined storage unit. As will be described later, the transmission path estimation circuit 20 compares the phase and amplitude value of the pilot symbol extracted by the pilot extraction circuit 22 with the phase and amplitude value of the pilot pattern PP, thereby transmitting the transmission path related to the pilot symbol. A function can be calculated.
  • the time direction interpolation circuit 24 is a circuit that interpolates the transmission path function calculated for the pilot symbols in the time direction (symbol direction). As shown in FIG. 3, the position of the carrier (carrier wave) into which the pilot symbol is inserted is 12 carrier intervals in the frequency direction and is shifted by 3 carriers in the time direction. Therefore, if attention is paid to the same carrier, pilot symbols are inserted at intervals of 4 symbols in the time direction. The transmission path function calculated for this pilot symbol is interpolated in the time direction.
  • the time direction interpolation circuit 24 interpolates the transmission path function four times in the frequency direction as a result.
  • linear interpolation may be performed, or an FIR filter may be used.
  • the frequency direction interpolation circuit 25 is a circuit that interpolates the transmission path function calculated for the pilot symbols in the frequency direction (carrier direction). As shown in FIG. 3, the position of the carrier into which the pilot symbol is inserted is 12 carrier intervals. The transmission path function calculated for this pilot symbol is interpolated in the frequency direction.
  • the frequency direction interpolation circuit 25 executes a process of interpolating the transmission line function four times in the frequency direction.
  • linear interpolation may be performed, or an FIR filter may be used.
  • a method of performing interpolation using a transmission path function of a pilot symbol In this way, the transmission path function for every three carriers is estimated.
  • the fading detection circuit 26 receives the received OFDM signal after the FFT operation and detects fading information.
  • the fading detection circuit 26 detects fading information by calculating the maximum average Doppler shift value.
  • the maximum average Doppler shift value is estimated from the rate of change of the pilot symbol power. For example, fading detection circuit 26 calculates the average power of pilot symbols in each symbol, obtains the rate of change of average power of pilot symbols over a plurality of symbols, and estimates the maximum Doppler shift value from this rate of change. .
  • the fading detection circuit 26 may estimate the maximum Doppler shift value based on the calculation result of the frequency synchronization circuit.
  • the switching circuit 27 selectively outputs the output result of the time direction interpolation circuit 24 or the frequency direction interpolation circuit 25 to the noise removal filter 28. As will be described later, the switching circuit 27 is based on the information on the maximum delay time of the multipath output from the multipath detection circuit 21 and the maximum Doppler shift value output from the fading detection circuit 26. The output of 24 and 25 is switched.
  • the noise removal filter 28 removes a noise component from the transmission path function interpolated four times by the time direction interpolation circuit 24 or the frequency direction interpolation circuit 25.
  • the frequency direction interpolation circuit 29 is a circuit that further interpolates the transmission path function interpolated four times in the time direction interpolation circuit 24 or the frequency direction interpolation circuit 25 in the frequency direction.
  • the transmission path function is estimated every three carriers for each symbol by quadruple interpolation of the transmission path function in the time direction interpolation circuit 24 or the frequency direction interpolation circuit 25. ing.
  • the frequency direction interpolation circuit 29 further interpolates the transmission path function estimated for every three carriers three times in the frequency direction. As a result, for each symbol, the transmission path function is estimated for all carriers.
  • linear interpolation may be performed, or an FIR filter may be used.
  • the reception signal converted into a digital signal by the A / D converter 8 is input to the FFT calculator 9 and the multipath detection circuit 21.
  • the FFT arithmetic unit 9 converts the time domain received signal into a frequency domain received OFDM signal.
  • the multipath detection circuit 21 calculates the maximum multipath delay time from the received signal after A / D conversion.
  • the received OFDM signal output from the FFT calculator 9 is output to the equalizer 10, the pilot extraction circuit 22, and the fading detection circuit 26.
  • Information on the maximum delay time of the multipath calculated by the multipath detection circuit 21 is output to the switching circuit 27.
  • the pilot extraction circuit 22 extracts a pilot symbol (SP) from the input received OFDM signal and outputs it to the divider 23.
  • the divider 23 calculates the pilot symbol transmission path function by dividing the pilot symbol signal value output from the pilot extraction circuit 22 by the pilot pattern PP signal value stored in the storage unit.
  • the transmission path function calculated by the divider 23 is output to the time direction interpolation circuit 24 and the frequency direction interpolation circuit 25. As described above, the divider 23 calculates a transmission path function for pilot symbols every 12 carriers for each symbol.
  • the time direction interpolation circuit 24 interpolates the transmission path function of the pilot symbol calculated by the divider 23 in the time direction. As a result, as shown in FIG. 4, for each symbol, a transmission path function for every three carriers in the frequency direction is estimated.
  • the frequency direction interpolation circuit 25 interpolates the transmission path function of the pilot symbol calculated by the divider 23 in the frequency direction. Thereby, as shown in FIG. 5, the transmission path function for every three carriers in the frequency direction is estimated for each symbol.
  • the maximum average Doppler shift value is calculated and output to the switching circuit 27.
  • the switching circuit 27 switches the interpolation method based on the multipath maximum delay time information input from the multipath detection circuit 21 and the maximum Doppler shift value input from the fading detection circuit 26.
  • FIG. 6 is a diagram showing a determination table 271 indicating the interpolation method switching criteria.
  • the switching circuit 27 performs interpolation control switching control using a determination table 271 stored in a storage unit (not shown).
  • the switching circuit 27 When the multipath maximum delay time ( ⁇ s) is equal to or greater than the predetermined threshold ⁇ , the switching circuit 27 is switched to the switch S1 side. Thereby, as shown in FIG. 2, the switching circuit 27 outputs the transmission path function output from the time direction interpolation circuit 24 to the noise removal filter 28.
  • the switching circuit 27 switches to the switch S1 side. It is done. Thereby, as shown in FIG. 2, the switching circuit 27 outputs the transmission path function output from the time direction interpolation circuit 24 to the noise removal filter 28.
  • the switching circuit 27 switches to the switch S2 side. It is done. Accordingly, the switching circuit 27 outputs the transmission path function output from the frequency direction interpolation circuit 25 to the noise removal filter 28.
  • the noise removal filter 28 removes a noise component from the transmission path function interpolated four times.
  • the transmission path function from which the noise component has been removed is output to the frequency direction interpolation circuit 29.
  • the transmission path function is interpolated three times in the frequency direction, and transmission path functions corresponding to all carriers are estimated.
  • the estimated transmission path function is output to the equalizer 10.
  • the equalizer 10 equalizes the signal by dividing all the symbol data output from the FFT calculator 9 by the transmission path function.
  • the OFDM receiver selects an interpolation method based on the multipath maximum delay time and fading information.
  • the transmission path estimation circuit 20 estimates the transmission path functions for all carriers by the interpolation processing in the time direction interpolation circuit 24 and the interpolation processing in the frequency direction interpolation circuit 29.
  • the maximum delay time of the multipath is equal to or greater than the predetermined threshold ⁇
  • the influence of the multipath is large. Therefore, the influence of the multipath interference is reduced by using the interpolation in the time direction. ing. That is, even when frequency selective fading occurs due to multipath, a signal with high quality can be obtained by interpolating the transmission path function in the same carrier. Since OFDM is characterized in that a high-quality broadcast signal can be demodulated even in a multipath environment, in order not to impair this feature, when the maximum delay time of multipath is large, the time direction Interpolation is used.
  • the transmission path estimation circuit 20 estimates the transmission path functions for all carriers by the interpolation processing in the time direction interpolation circuit 24 and the interpolation processing in the frequency direction interpolation circuit 29.
  • the predetermined threshold fd may be selected as an optimal value through experiments or the like. That is, even when interpolation in the time direction is performed, the threshold value fd of the maximum Doppler shift value is set in a range where no error occurs in the estimation of the transmission path function.
  • the transmission path estimation circuit 20 estimates transmission path functions for all carriers by the interpolation processing in the frequency direction interpolation circuit 25 and the interpolation processing in the frequency direction interpolation circuit 29.
  • the frequency is improved to improve the Rayleigh fading characteristic.
  • An interpolation method based only on the direction is selected. That is, the transmission path function is estimated by interpolation within one symbol.
  • a high-quality broadcast signal can be demodulated even during high-speed movement.
  • an optimal value for the threshold ⁇ may be selected through experiments or the like. That is, even when the transmission path function is estimated by performing interpolation only in the frequency direction, the threshold ⁇ is set in a range where the influence of multipath is not large.
  • the OFDM receiving apparatus switches the interpolation method by determining both the multipath maximum delay time and the fading information based on the maximum Doppler shift value.
  • the OFDM receiving apparatus switches the interpolation method by determining both the multipath maximum delay time and the fading information based on the maximum Doppler shift value.
  • the frequency direction interpolation circuit 25 performs quadruple interpolation in the frequency direction
  • the frequency direction interpolation circuit 29 further performs triple interpolation in the frequency direction.
  • the frequency direction interpolation circuit 25 and the frequency direction interpolation circuit 29 can share an interpolation filter, and the circuit scale can be further reduced.
  • a noise removal filter 28 can be interposed between the frequency direction interpolation circuit 25 and the frequency direction interpolation circuit 29, and noise characteristics can be improved.
  • noise removal processing could not be performed on the intermediate data.
  • the frequency direction interpolation circuit is distributed in two. Thus, it is possible to perform noise removal processing on intermediate data.
  • the noise removal filter 28 is interposed between the time direction interpolation circuit 24 and the frequency direction interpolation circuit 29, it is possible to execute noise removal processing on intermediate data.
  • the noise processing filter interposed between the frequency direction interpolation circuit 25 and the frequency direction interpolation circuit 29 and the noise processing filter interposed between the time direction interpolation circuit 24 and the frequency direction interpolation circuit 29 are made common. It is possible to reduce the circuit scale.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

L'invention concerne un récepteur OFDM permettant de démoduler un signal reçu avec une grande précision en éliminant l'effet des interférences par trajets multiples et en éliminant l'effet de l'évanouissement de Rayleigh causé lorsque le récepteur se déplace très vite. Un circuit d'estimation de trajet de transmission (20) détecte les informations d'évanouissement d'après un temps de retard maximum des trajets multiples et une valeur de décalage Doppler maximum. Lorsque le temps de retard maximum des trajets multiples est inférieur à une valeur seuil (τ) et que la valeur de décalage Doppler maximum est supérieure ou égale à une valeur seuil (fd), une fonction de trajet de transmission est estimée par un circuit d'interpolation de direction de fréquence (25) et un circuit d'interpolation de direction de fréquence (29). Si l'une des conditions diffère de celles précitées, la fonction de trajet de transmission est estimée par un circuit d'interpolation de direction de temps (24) et le circuit d'interpolation de direction de fréquence (29). Un filtre d'élimination du bruit (28) est fourni entre le circuit d'interpolation de direction de fréquence (25) et le circuit d'interpolation de direction de fréquence (29).
PCT/JP2009/051210 2008-02-05 2009-01-26 Récepteur ofdm WO2009098965A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-024976 2008-02-05
JP2008024976A JP5076239B2 (ja) 2008-02-05 2008-02-05 Ｏｆｄｍ受信装置

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WO2009098965A1 true WO2009098965A1 (fr) 2009-08-13

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5565880B2 (ja) * 2009-11-19 2014-08-06 日本電気株式会社 受信装置および受信方法、並びにプログラム
WO2015174294A1 (fr) * 2014-05-14 2015-11-19 ソニー株式会社 Dispositif de traitement de signaux, procédé de traitement de signaux et programme
EP2520057A4 (fr) * 2009-12-29 2017-03-15 Thomson Licensing Procédé et appareil d'estimation de canal
US11595079B2 (en) 2020-04-02 2023-02-28 T-Worx Holdings, LLC High-throughput data communication for rail-mounted devices

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5306111B2 (ja) * 2009-08-25 2013-10-02 三菱電機株式会社 Ｏｆｄｍ受信装置
JP5459767B2 (ja) * 2009-10-26 2014-04-02 日本電気株式会社 受信装置および受信方法、並びにプログラム
JP5542483B2 (ja) * 2010-03-11 2014-07-09 三菱電機株式会社 Ｏｆｄｍ受信装置
JP5676513B2 (ja) * 2012-03-30 2015-02-25 富士通テン株式会社 受信装置
JP5991897B2 (ja) * 2012-10-17 2016-09-14 株式会社メガチップス 通信装置及び通信方法

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JP2004096703A (ja) * 2001-11-15 2004-03-25 Matsushita Electric Ind Co Ltd Ｏｆｄｍ復調方法及びｏｆｄｍ復調装置
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JP2007028201A (ja) * 2005-07-15 2007-02-01 Sony Corp ドップラー周波数算出装置及び方法、並びにｏｆｄｍ復調装置
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JP2004096703A (ja) * 2001-11-15 2004-03-25 Matsushita Electric Ind Co Ltd Ｏｆｄｍ復調方法及びｏｆｄｍ復調装置
JP2004247945A (ja) * 2003-02-13 2004-09-02 Toshiba Corp Ｏｆｄｍ受信装置、半導体集積回路及びｏｆｄｍ受信方法
JP2007028201A (ja) * 2005-07-15 2007-02-01 Sony Corp ドップラー周波数算出装置及び方法、並びにｏｆｄｍ復調装置
JP2008017124A (ja) * 2006-07-05 2008-01-24 Sharp Corp デジタル受信装置、その制御方法、デジタル受信装置用プログラム及びそのプログラムを記録した記録媒体
JP2008227622A (ja) * 2007-03-08 2008-09-25 Sanyo Electric Co Ltd 受信装置及び通信方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5565880B2 (ja) * 2009-11-19 2014-08-06 日本電気株式会社 受信装置および受信方法、並びにプログラム
EP2520057A4 (fr) * 2009-12-29 2017-03-15 Thomson Licensing Procédé et appareil d'estimation de canal
WO2015174294A1 (fr) * 2014-05-14 2015-11-19 ソニー株式会社 Dispositif de traitement de signaux, procédé de traitement de signaux et programme
US11595079B2 (en) 2020-04-02 2023-02-28 T-Worx Holdings, LLC High-throughput data communication for rail-mounted devices

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