WO2009141866A1 - Récepteur, procédé de traitement de réception, programme de traitement de réception et support d'enregistrement - Google Patents

Récepteur, procédé de traitement de réception, programme de traitement de réception et support d'enregistrement Download PDF

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Publication number
WO2009141866A1
WO2009141866A1 PCT/JP2008/059220 JP2008059220W WO2009141866A1 WO 2009141866 A1 WO2009141866 A1 WO 2009141866A1 JP 2008059220 W JP2008059220 W JP 2008059220W WO 2009141866 A1 WO2009141866 A1 WO 2009141866A1
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WO
WIPO (PCT)
Prior art keywords
frequency
signal
unit
carrier
receiving apparatus
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Application number
PCT/JP2008/059220
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English (en)
Japanese (ja)
Inventor
茂樹 中村
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パイオニア株式会社
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Publication date
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Priority to PCT/JP2008/059220 priority Critical patent/WO2009141866A1/fr
Publication of WO2009141866A1 publication Critical patent/WO2009141866A1/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

Definitions

  • the present invention relates to a reception device, a reception processing method, a reception processing program, and a recording medium on which the reception processing program is recorded.
  • OFDM orthogonal frequency division multiplexing
  • a frequency conversion unit that converts the frequency of the modulation signal to generate two analog baseband signals having orthogonal phases, and a base of the analog format
  • An analog-to-digital converter that converts a band signal into a digital format (hereinafter referred to as an “AD converter”) and a Fourier transform processing unit that performs a Fourier transform process on a digital baseband signal Known (refer to Patent Documents 1 and 2, etc .: hereinafter referred to as “conventional example”).
  • the present invention has been made in view of the above circumstances, and provides a receiving apparatus and a receiving processing method capable of ensuring an accurate receiving process when a signal modulated by a multicarrier method is received. With the goal.
  • generating means for frequency-converting a multicarrier signal carrying information in accordance with a predetermined transmission protocol and generating two baseband signals having orthogonal phases;
  • Frequency control means for controlling the frequency shift from the frequency band of the multicarrier signal to the frequency band of the baseband signal during the conversion to the generation means, and the frequency control means includes the baseband A receiving apparatus that performs control to shift a frequency of a specific carrier that has a high probability of avoiding an adverse effect due to waveform degradation on a result of demodulation processing from a signal to a frequency band in which waveform degradation is unavoidable.
  • the present invention is a multicarrier signal reception processing method in which information is carried out in accordance with a predetermined transmission protocol, wherein the base is caused by waveform deterioration with respect to a result of demodulation processing from a baseband signal.
  • the present invention is a reception processing program characterized by causing an arithmetic means to execute the reception processing method of the present invention.
  • the present invention is a recording medium in which the reception processing program of the present invention is recorded so as to be readable by a calculation means.
  • FIG. (1) for demonstrating the process of frequency control.
  • FIG. (2) for demonstrating the process of frequency control.
  • a receiver that receives a digital terrestrial television broadcast wave that has been subjected to OFDM (Orthogonal-Frequency-Division-Multiplex) modulation after being encoded by the MPEG method, and processes the signal using the direct conversion method.
  • OFDM Orthogonal-Frequency-Division-Multiplex
  • FIG. 1 is a block diagram illustrating a schematic configuration of a receiving device 100 according to an embodiment.
  • the receiving apparatus 100 includes an antenna 110, a band pass filter (hereinafter also referred to as “BPF”) 120, a low noise amplifier (LNA) 125, and a reproduction processing unit 130.
  • BPF band pass filter
  • LNA low noise amplifier
  • the receiving device 100 includes an operation input unit 140, a sound output unit 150, and a display unit 160.
  • the receiving device 100 includes a control unit 180.
  • the antenna 110 receives a terrestrial digital television broadcast wave. Then, the reception result by the antenna 110 is sent to the BPF 120 as a reception signal RFS.
  • the BPF 120 receives the reception signal RFS from the antenna 110. Then, the BPF 120 selectively passes signals in a specific frequency range from the reception signal RFS.
  • the low noise amplifier 125 amplifies the signal that has passed through the BPF 120 so as not to deteriorate the signal-to-noise ratio (SNR).
  • the amplification result by the low noise amplifier 125 is output to the reproduction processing unit 130 as a signal RFA.
  • the reproduction processing unit 130 processes the signal RFA from the low noise amplifier 125 under the control of the control unit 180 and supplies it to the audio data ADT and the display unit 160 for supply to the sound output unit 150.
  • Video data IDT is generated.
  • the reproduction processing unit 130 includes an OFDM demodulating unit 131 and a decoding unit 132.
  • the reproduction processing unit 130 includes an audio processing unit 133 and a video processing unit 134.
  • the OFDM demodulator 131 performs OFDM demodulation processing based on the signal RFA from the low noise amplifier 125. As shown in FIG. 3, the OFDM demodulator 131 includes a frequency converter 210 serving as a generation unit, capacitor elements 220 I and 220 Q , and analog to digital converters (ADCs) 230 I and 230. With Q. The OFDM demodulator 131 includes a digital signal processor 240.
  • the frequency conversion unit 210 converts the frequency of the signal RFA from the low noise amplifier 125 to generate two baseband signals BBS I and BBS Q whose phases are orthogonal. As shown in FIG. 4, the frequency conversion unit 210 includes mixers (mixers) 211 I and 211 Q and low-pass filters (LPF) 212 I and 212 Q. The frequency conversion unit 210 includes a local oscillation circuit (OSC) 213 as a local oscillation unit and a 90 ° phase shift unit 214.
  • OSC local oscillation circuit
  • the mixer 211 I mixes the signal RFA output from the low noise amplifier 125 and the oscillation signal CFI supplied from the local oscillation circuit 213.
  • the signal mixed by the mixer 211 I is sent to the LPF 212 I.
  • the mixer 211 Q mixes the signal RFA output from the low noise amplifier 125 and the oscillation signal CFQ supplied from the 90 ° phase shifter 214.
  • the signal mixed by the mixer 211 Q is sent to the LPF 212 Q.
  • the LPF 212 I removes unnecessary harmonic components from the signal received from the mixer 211 I.
  • the signal that has passed through the LPF 212 I is a real axis component of the OFDM modulated wave, and is sent to the capacitor element 220 I as an analog baseband signal BBS I having an I (in-phase) component.
  • the LPF 212 Q removes unnecessary harmonic components from the signal received from the mixer 211 Q.
  • the signal thus passing through the LPF 212 Q is an imaginary axis component of the OFDM modulated wave, and is sent to the capacitor element 220 Q as an analog baseband signal BBS Q having a Q (orthogonal) component.
  • the local oscillation circuit 213 includes an oscillator that can control the oscillation frequency by voltage control or the like.
  • the local oscillation circuit 213 in accordance with the supplied frequency control signal AFC from the digital signal processing unit 240, generates an oscillation signal CFI frequency corresponding to the control signal, supplied to the mixer 211 I and 90 ° phase shifter 214 .
  • the 90 ° phase shifter 214 receives the oscillation signal CFI from the local oscillation circuit 213. Then, 90 ° phase shift unit 214, an oscillation signal CFI generates an oscillation signal CFQ obtained by shifting the phase by 90 °, is supplied to the mixer 211 Q.
  • a high-pass filter HPF
  • the carrier in which the waveform deterioration due to the influence of the HPF is indispensable for the reproduction of broadcast contents such as audio data and video data, and when there is no other carrier carrying the same data, If the deformation exceeds an allowable range corresponding to the modulation method for the carrier, good reproduction is hindered.
  • the carrier interval 0.92 kHz in the OFDM segment mode 3
  • the predetermined number is determined in advance based on experiments, simulations, experiences, and the like from the viewpoint of the influence of waveform deterioration of a specific carrier, which will be described later, on the demodulation result.
  • a desired DC bias can be set for the input signal by adjusting the value of the reference voltage generated by a reference voltage generator (not shown).
  • the digital signal processing unit 240 includes a frequency shift unit 241 and a frequency error detection unit 242 as detection means, as shown in FIG.
  • the digital signal processing unit 240 includes an FFT (Fast Fourier Transform) calculation unit 243, a frequency control unit 244 as frequency control means, and a demodulation unit 245.
  • FFT Fast Fourier Transform
  • the frequency shift unit 241 receives digital baseband signals BBD I and BBD Q from the analog-digital converters 230 I and 230 Q. Then, the frequency shift unit 241 shifts the baseband signals BBD I and BBD Q by a predetermined frequency. The baseband signals thus frequency shifted are sent to the frequency error detection unit 242 and the FFT operation unit 243 as signals BFD I and BFD Q.
  • the predetermined frequency is the same as a shift amount ⁇ F, which will be described later, specified in the frequency control unit 244, but the shift direction is opposite to the shift direction specified in the frequency control unit 244.
  • the frequency error detection unit 242 receives signals BFD I and BFD Q that are OFDM time domain signals from the frequency shift unit 241.
  • the frequency error detection unit 242 detects the frequency error ERD by obtaining a correlation between the waveform of the effective symbol period and the waveform of the guard interval period using a delay memory of one symbol.
  • the frequency error ERD thus detected is sent to the frequency control unit 244.
  • the FFT operation unit 243 performs fast Fourier transform on the OFDM time domain signal, and extracts and outputs information that is orthogonally modulated on each carrier.
  • the FFT operation unit 243 receives the signals BFD I and BFD Q from the frequency shift unit 241. Then, the FFT operation unit 243 performs a fast Fourier transform process on the OFDM time domain signal of the effective symbol extracted in the window having a time width obtained by subtracting the guard interval length from one OFDM symbol length.
  • the signal thus subjected to the fast Fourier transform processing is sent to the demodulation unit 245 as the signal FFD in the OFDM frequency domain.
  • the signal FFD is a complex signal composed of a real axis component and an imaginary axis component, like the baseband signals BBD I and BBD Q.
  • the frequency control unit 244 determines a frequency designated for the local oscillation circuit 213.
  • the frequency control unit 244 receives the channel selection command CLS from the control unit 180 and also receives the frequency error ERD from the frequency error detection unit 242.
  • the frequency control unit 244 first obtains the first stage frequency corresponding to the channel to be selected in the frequency conversion unit 210 in accordance with the channel selection command CSL. Next, the frequency control unit 244 has a frequency band in which waveform degradation occurs due to the influence of the HPF formed by the capacitance of the capacitor element 220 I (220 Q ) and the input impedance component of the analog-digital converter 230 I (230 Q ). Then, the second stage frequency shifted by the shift amount ⁇ F with respect to the first stage frequency is obtained so as to be in the frequency band of the specific carrier that can avoid the adverse effect due to waveform deterioration.
  • the frequency control unit 244 obtains a final stage frequency that further considers the frequency error ERD with respect to the second stage frequency. Then, the frequency control unit 244 generates a frequency control signal AFC specifying the final stage frequency, and supplies the control signal to the local oscillation circuit 213.
  • FIG. 7 shows a configuration example of an OFDM frame in an OFDM signal.
  • an OFDM frame includes a CP (Continual Pilot) carrier, an AC (Auxiliary Channel) carrier, a TMCC (Transmission Multiplexing Configuration Control) carrier, and S m, n that is a carrier symbol in a data segment. It is comprised from the carrier etc. which contain.
  • the specific carrier includes a plurality of carriers carrying information of the same content, and in the present embodiment, the specific carrier is an AC carrier that is not used for the reproduction process.
  • the demodulator 245 receives the signal FFD from the FFT calculator 243. Then, the demodulation unit 245 performs OFDM demodulation on the signal FFD. A portion related to audio and video in the OFDM demodulation result is output to the decoding unit 132 as a content demodulated signal DMD.
  • the decoding unit 132 receives the content demodulated signal DMD from the OFDM demodulating unit 131. Then, the decoding unit 132 decodes the content demodulated signal DMD, and sends a decoding result related to audio to the audio processing unit 133 as demodulated audio data DAD. Further, the decoding unit 132 sends the decoding result related to the video to the video processing unit 134 as demodulated video data DID.
  • the audio processing unit 133 generates audio data ADT based on the demodulated audio data DAD.
  • the generated audio data ADT is sent to the sound output unit 150.
  • the video processing unit 134 generates video data IDT based on the demodulated video data DID.
  • the generated video data IDT is sent to the display unit 160.
  • the operation input unit 140 includes a key unit provided in the main body of the receiving device 100 and / or a remote input device including the key unit.
  • a touch panel provided in the display unit 160 can be used as the key part provided in the main body. Moreover, it can replace with the structure which has a key part, or can also employ
  • the operation content of the receiving device 100 is set by the user operating this operation input unit 140. For example, input by the user such as channel selection is performed using the operation input unit 140. Such input contents are sent from the operation input unit 140 to the control unit 180 as operation input data IPD.
  • the sound output unit 150 includes (i) a DA (Digital-to-Analogue) converter that converts the audio data ADT received from the reproduction processing unit 130 into an analog signal, and (ii) an analog signal output from the DA converter. And (iii) a speaker that converts the amplified analog signal into sound.
  • the sound output unit 150 reproduces and outputs broadcast audio corresponding to the broadcast wave of the selected reproduction channel.
  • the display unit 160 includes, for example, (i) a display device such as a liquid crystal panel, an organic EL (Electro Luminescence) panel, and a PDP (Plasma Display Panel), and (ii) video data IDT received from the reproduction processing unit 130.
  • a display control circuit for displaying an image on the display device.
  • the display unit 160 reproduces and displays a broadcast image corresponding to the selected reproduction channel.
  • the control unit 180 When the reproduction channel designation input to the operation input unit 140 is notified as the operation input data IPD, the control unit 180 generates a reproduction channel tuning instruction CSL according to the reproduction channel designation, and reproduces the reproduction processing unit 130. Output to.
  • the control unit 180 In the receiving apparatus 100, when the user inputs a desired station designation to the operation input unit 140, the control unit 180 is notified to that effect. Receiving this report, the control unit 180 sends a channel selection command CSL of the desired station to the frequency control unit 244 of the digital signal processing unit 240 in the reproduction processing unit 130 (see FIG. 6).
  • the frequency control unit 244 that has received the channel selection command CSL obtains the first stage frequency corresponding to the channel to be selected in the frequency conversion unit 210.
  • the frequency control unit 244 is a frequency band in which waveform degradation occurs due to the influence of the HPF formed by the capacitance of the capacitor element 220 I (220 Q ) and the input impedance component of the analog-digital converter 230 I (230 Q ).
  • a second stage frequency is obtained by shifting the first stage frequency by ⁇ F so that the vicinity of 0 Hz becomes an AC carrier. Thereafter, the frequency control unit 244 generates a frequency control signal AFC specifying the second stage frequency, and supplies the control signal to the local oscillation circuit 213 (see FIG. 4).
  • the local oscillation circuit 213 Upon receiving the frequency control signal AFC, the local oscillation circuit 213 generates an oscillation signal CFI having a frequency corresponding to the control signal, and supplies the oscillation signal CFI to the mixer 211 I and the 90 ° phase shift unit 214. Further, 90 ° phase shift unit 214 receives the oscillation signal CFI is an oscillation signal CFI generates an oscillation signal CFQ obtained by shifting the phase by 90 °, is supplied to the mixer 211 Q.
  • the terrestrial digital television broadcast wave is received by the antenna 110 and sent to the BPF 120 as a reception signal RFS.
  • the BPF 120 selectively passes a signal in a specific frequency range in the reception signal RFS and sends the signal to the low noise amplifier 125.
  • the low noise amplifier 125 amplifies the signal that has passed through the BPF 120 so as not to degrade the SNR.
  • the amplification result by the low noise amplifier 125 is output to the reproduction processing unit 130 as a signal RFA (see FIG. 1).
  • the analog baseband signal BBS j is supplied to the analog-to-digital converter 230 j via the capacitor element 220 j and converted into a digital baseband signal BBD j (see FIG. 3).
  • the frequency band in which the waveform deterioration occurs becomes an AC carrier by the control for obtaining the second stage frequency by the frequency control unit 244. Therefore, a schematic diagram of a carrier obtained by converting the baseband signal BBD j into the frequency domain by Fourier transform is as shown in FIG. 8A.
  • a schematic diagram of a carrier obtained by converting the signal BFD j output from the frequency shift unit 241 into the frequency domain by Fourier transform is as shown in FIG. 8B.
  • the frequency error detection unit 242 detects the frequency error ERD and sends it to the frequency control unit 244.
  • the frequency control unit 244 that has received the frequency error ERD generates a frequency control signal AFC that designates the final stage frequency that further considers the frequency error ERD with respect to the second stage frequency, and supplies the frequency control signal AFC to the local oscillation circuit 213.
  • the FFT operation unit 243 performs fast Fourier transform on the signals BFD I and BFD Q to extract information that is orthogonally modulated on each carrier.
  • the extraction result is sent to the demodulation unit 245 as a signal FFD.
  • the demodulating unit 245 demodulates the signal FFD and sends it to the decoding unit 132 as a content demodulated signal DMD.
  • the decoding unit 132 Upon receiving the content demodulated signal DMD, the decoding unit 132 decodes the content demodulated signal DMD encoded by the MPEG system, and outputs the demodulated audio data DAD and demodulated video data DID to the audio processing unit 133 and the video processing unit 134. send.
  • the sound processing unit 133 Upon receiving the demodulated sound data DAD, the sound processing unit 133 generates sound data ADT and sends it to the sound output unit 150. As a result, broadcast sound from the desired station based on the received signal RFS is output from the speaker of the sound output unit 150.
  • the video processing unit 134 that has received the demodulated video data DID generates video data IDT and sends it to the display unit 160.
  • the broadcast video from the desired station based on the received signal RFS is displayed on the display device of the display unit 160.
  • the frequency conversion in the frequency conversion unit 210 of the signal RFA output from the low noise amplifier 125 is designated by the frequency control signal AFC from the frequency control unit 244 of the digital signal processing unit 240. Is performed according to the determined frequency.
  • the frequency control signal AFC there are a plurality of carriers in which the carrier affected by the high-pass filter configured by the capacitance of the capacitor element 220 j and the input impedance component of the analog-digital converter 230 j carries the same information.
  • control is performed so that the AC carrier is not used for the reproduction process.
  • the specific carrier may be any carrier as long as it can avoid an adverse effect due to waveform deterioration on the result of demodulation processing from the baseband signal. That is, when there is a carrier that is not used for transmitting information for performing reproduction processing or the like, the carrier can be suitably employed as the specific carrier. Further, even when there is no carrier that is not used for information transmission, if there are a plurality of carriers that carry information of the same content, one of them can be suitably adopted as a specific carrier. .
  • a carrier that is modulated by a highly error-resistant method is adopted. You may do it.
  • a TMCC carrier modulated by the DBPSK modulation scheme corresponds to a carrier modulated by a scheme with high error resistance.
  • the baseband signal BBD j I, Q
  • the baseband signal BBD j is provided with a frequency shift unit that performs frequency shift.
  • the baseband signal BBD j is demodulated without performing frequency shift. If this is possible, the baseband signal BBD j may be directly input to the frequency error detection unit and the FFT calculation unit, and the frequency shift unit may be omitted.
  • a frequency error may be detected based on a certain baseband signal BBD j .
  • the frequency error detection unit detects the frequency error by obtaining the correlation between the waveform of the effective symbol period and the waveform of the guard interval period using a delay memory of one symbol.
  • a known synchronization symbol provided for each symbol is extracted, and a frequency error ERD is detected by examining a correlation between the extracted synchronization symbol and a previously stored comparison symbol. May be.
  • the receiving device of the above embodiment employs a direct conversion method for directly converting an RF signal into a baseband signal, but after converting the RF signal to an intermediate frequency band (hereinafter referred to as “IF band”), A superheterodyne system that converts a signal having a frequency in the IF band into a baseband signal may be employed.
  • IF band intermediate frequency band
  • the present invention is applied to a receiving apparatus that receives a digital television broadcast wave.
  • the receiving apparatus receives a broadcast wave modulated by a multicarrier scheme such as OFDM other than the digital television broadcast wave.
  • the present invention can be applied.
  • the present invention can be applied not only to a receiving device that receives broadcast waves, but also to a receiving device for data communication.
  • the transmission medium for broadcast signals and communication signals may be either wireless or wired.
  • the receiving device of the above embodiment may be fixedly installed in a home or the like, or may be mounted on a moving body such as a vehicle.
  • control unit 180 in the above embodiment is configured as a computer as a calculation unit including a central processing unit (CPU: Central Processing Unit), a digital signal processing device (DSP: Digital Signal Processing), and the like. You may make it perform one part or all part of the process in said embodiment by running a program with the said computer.
  • This program is recorded on a computer-readable recording medium such as a hard disk, CD-ROM, or DVD, and is read from the recording medium and executed by the computer.
  • the program may be acquired in a form recorded on a portable recording medium such as a CD-ROM or DVD, or may be acquired in a form of delivery via a network such as the Internet. Also good.

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

Abstract

Selon l'invention, une section de conversion de fréquence (210) effectue une conversion de fréquence d'un signal RFA délivré par un amplificateur à faible bruit (125) conformément à une fréquence désignée par un signal de commande de fréquence AFC provenant d'une section de commande de fréquence sur une section de traitement de signal numérique (240). Le signal de commande de fréquence AFC comprend des porteuses qui sont affectées par un filtre passe-haut constitué d'une capacité électrostatique d'un élément condensateur (220j) (j = I, Q) et une composante d'impédance d'entrée d'un convertisseur analogique/numérique (230j), une commande étant effectuée de telle manière qu'une pluralité de porteuses transportant des informations des mêmes contenues existent et ces porteuses sont indisponibles pour un processus de reproduction. Cela assure la réception d'ondes de radiodiffusion numérique terrestre transmises dans le procédé de modulation OFDM et l'extraction précise des informations de données transportées par les ondes de radiodiffusion, ce par quoi un processus de réception exact est réalisé.
PCT/JP2008/059220 2008-05-20 2008-05-20 Récepteur, procédé de traitement de réception, programme de traitement de réception et support d'enregistrement WO2009141866A1 (fr)

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PCT/JP2008/059220 WO2009141866A1 (fr) 2008-05-20 2008-05-20 Récepteur, procédé de traitement de réception, programme de traitement de réception et support d'enregistrement

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PCT/JP2008/059220 WO2009141866A1 (fr) 2008-05-20 2008-05-20 Récepteur, procédé de traitement de réception, programme de traitement de réception et support d'enregistrement

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH118604A (ja) * 1997-06-18 1999-01-12 Hitachi Denshi Ltd 直交周波数分割多重変調信号の伝送方式
JPH11205276A (ja) * 1998-01-20 1999-07-30 Nippon Telegr & Teleph Corp <Ntt> マルチキャリア変調装置
JP2001144722A (ja) * 1999-03-02 2001-05-25 Matsushita Electric Ind Co Ltd Ｏｆｄｍ送受信装置
JP2003264523A (ja) * 2002-03-07 2003-09-19 Sanyo Electric Co Ltd ダイレクトコンバージョン受信機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH118604A (ja) * 1997-06-18 1999-01-12 Hitachi Denshi Ltd 直交周波数分割多重変調信号の伝送方式
JPH11205276A (ja) * 1998-01-20 1999-07-30 Nippon Telegr & Teleph Corp <Ntt> マルチキャリア変調装置
JP2001144722A (ja) * 1999-03-02 2001-05-25 Matsushita Electric Ind Co Ltd Ｏｆｄｍ送受信装置
JP2003264523A (ja) * 2002-03-07 2003-09-19 Sanyo Electric Co Ltd ダイレクトコンバージョン受信機

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