WO2006103922A1 - Recepteur radio - Google Patents

Recepteur radio Download PDF

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Publication number
WO2006103922A1
WO2006103922A1 PCT/JP2006/305032 JP2006305032W WO2006103922A1 WO 2006103922 A1 WO2006103922 A1 WO 2006103922A1 JP 2006305032 W JP2006305032 W JP 2006305032W WO 2006103922 A1 WO2006103922 A1 WO 2006103922A1
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WO
WIPO (PCT)
Prior art keywords
filter
signal
digital
output
iir
Prior art date
Application number
PCT/JP2006/305032
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English (en)
Japanese (ja)
Inventor
Yuji Yamamoto
Original Assignee
Pioneer 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 Pioneer Corporation filed Critical Pioneer Corporation
Priority to JP2007510371A priority Critical patent/JP4523968B2/ja
Publication of WO2006103922A1 publication Critical patent/WO2006103922A1/fr

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Classifications

    • 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters

Definitions

  • the present invention relates to a radio receiver including an adaptive filter that suppresses the effects of multipath fading and flat fading.
  • the conventional radio receiver shown in Fig. 1 (a) performs A / D conversion after band-limiting and amplifying the intermediate frequency signal (IF signal) frequency-converted by the front end 1 by the IF amplifier 2.
  • the digital IF signal X is converted to a digital IF signal X by the detector 3, and the adaptive processing is applied to the digital IF signal X by the adaptive filter 4 to generate a digital IF signal Y that suppresses multipath fading. I started to detect it.
  • the adaptive filter 4 includes an IIR type digital filter that performs filtering on the digital IF signal X, and an IIR type digital filter that suppresses multipath fading. It has a coefficient update unit OPRT that variably adjusts the tap coefficient (filter coefficient) of the filter.
  • the IIR type digital filter has a multiplier a0 that amplifies the digital IF signal X, an adder SUM1 that adds the output of the multiplier aO and a feedback signal FB described later, and one sample delay each. It has multiple delay elements (z _ 1 ) and inputs the output of adder SUM1. Shift register SRG, and multipliers bO to bn that multiply the output of each delay element (z _ 1 ) by the filter coefficient, and the outputs of multipliers bO to bn are added to obtain feedback signal FB. And an adder SUM2 to be generated.
  • the coefficient updating unit OPRT calculates the square root ⁇ of the digital IF signals Y (t) and Y (tl) output from the adder SUM1 and shifted by one sample delay, and further calculates the square root of the square.
  • the filter coefficients of the multipliers b0 to bn are variably adjusted so that the convergence error Err (t) between ⁇ and the predetermined convergence value Vth converges to zero.
  • the square root ⁇ of the square and the convergence error Err (t) are calculated by performing the calculation represented by the following equations (1) and (2), and the multipliers b0 to bn are calculated based on the convergence error Err (t).
  • Each filter coefficient is variably adjusted.
  • the convergence value Vth is a fixed value for effectively removing multipath fading, and is determined by experiments.
  • the adaptive filter 4 outputs the digital IF signal Y in which the multipath fading is suppressed from the adder SUM1, and the detector 5 detects the waveform distortion and the like so that the detection signal ( Baseband signal) Sout is output.
  • the adaptive filter 4 is formed of an IIR digital filter
  • the conventional radio receiver has a convenient configuration for suppressing multipath fading.
  • multipath fading which is frequency selective fading, is due to the fact that the AM component due to interference between the direct wave and the reflected wave is generated in the FM wave, so the ratio of the direct wave and the reflected wave is 1: 1.
  • the impulse response of the IIR digital filter continues indefinitely. Therefore, the IIR type digital filter is effective, and the multipath fading converges to the convergence value Vth, so that the amplitude of the digital IF signal Y (the amplitude when an analog IF signal is used) is kept constant. Remove multipath feeding You can.
  • the present invention has been made in view of such a conventional problem, and is provided with a radio reception provided with an adaptive filter that can stably suppress multipath fading and flat fading.
  • the purpose is to provide a machine.
  • the invention of claim 1 is a wireless receiver that suppresses fading included in an intermediate frequency signal of an FM wave, the electric field strength is measured from the intermediate frequency signal, and the electric field strength is a predetermined threshold value.
  • the IIR filter according to the determination means for generating a switching control signal indicating the first determination result when the electric field strength is smaller than the threshold and the switching control signal indicating the first determination result when the electric field strength is smaller than the threshold.
  • the intermediate frequency signal is adaptively filtered, and the FIR filter adaptively performs the filtering process on the intermediate frequency signal according to the switching control signal indicating the second determination result.
  • the switching control signal indicating the second determination result and outputting the output signal of the IIR filter according to the adaptive filter means and the switching control signal indicating the first determination result It characterized by having a a switching means for outputting an output signal of the FI R filter.
  • the adaptive filter means adaptively performs filtering on the intermediate frequency signal by the IIR filter.
  • the filter coefficient of the IIR filter is automatically adjusted to suppress fluctuations in the output of the IIR filter and the intermediate frequency signal is adaptively filtered by the FIR filter
  • the FIR filter It is characterized by having coefficient updating means for automatically adjusting the filter coefficient of the FIR filter so as to suppress fluctuations in the output of the filter.
  • the invention according to claim 3 is the radio receiver according to claim 1 or 2, wherein the IIR The output signal of the type filter is output from the position of the intermediate tap of the IIR type filter.
  • FIG. 1 is a block diagram for explaining a configuration of a conventional radio receiver.
  • FIG. 2 is a block diagram showing a configuration of a wireless receiver according to the embodiment of the present invention.
  • FIG. 3 is a block diagram illustrating a configuration of a wireless receiver according to an embodiment.
  • FIG. 2 is a block diagram showing the configuration of the wireless receiver of this embodiment.
  • this wireless receiver extracts an FM broadcast band RF signal from various broadcast waves received by the receiving antenna, and mixes the local oscillation signal and the RF signal of the local oscillation frequency. Output the intermediate frequency IF signal, the IF signal is output from the IF amplifier 7 and the IF amplifier 7 that outputs the IF signal as the desired wave by amplifying the IF signal by band limiting.
  • An AZD converter 8 that converts the IF signal to be converted into a digital IF signal X from analog to digital, an adaptive filter 9, a switching unit 10, a detector 11, and a determination unit 12 are configured.
  • the determination unit 12 calculates an electric field strength (S meter) from the digital IF signal X, and compares the calculated electric field strength with a predetermined threshold value THD. When the electric field strength is larger than the threshold THD, the switching control signal SEL indicating the first determination result is sent to the adaptive filter 9 and the switching unit 10 when the electric field strength is smaller than the threshold THD. Supply.
  • S meter electric field strength
  • THD threshold value
  • the switching unit 10 converts the output signal SIIR filtered by the adaptive filter 9 into a digital IF signal Y and detects the detector 11
  • the switching control signal SEL indicating the second determination result is supplied, the output signal SFIR filtered by the adaptive filter 9 is transferred to the detector 11 as the digital IF signal Y.
  • the adaptive filter 9 includes an IIR type digital filter, an FIR type digital filter, and a coefficient updating unit that adjusts filter coefficients of these digital filters.
  • the switching control signal SEL indicating the first determination result is supplied from the determination unit 12
  • the adaptive filter 9 performs a filtering process using an IIR digital filter on the digital IF signal X, and outputs the filtered output.
  • the signal SIIR is supplied to the detector 11 as a digital IF signal Y through the switching unit 10.
  • the switching control signal SEL indicating the second determination result is supplied from the determination unit 12
  • the digital IF signal X is filtered by the FIR digital filter, and the filtered output signal SFIR is switched.
  • the digital IF signal Y is supplied to the detector 11 through the control unit 10.
  • the amplitude fluctuation of the digital IF signal Y that is the output of the above-described coefficient update unit force switching unit 10 provided in the adaptive filter 9 (the amplitude fluctuation when the digital IF signal Y is an analog signal) is calculated. Detect and adjust the filter coefficient of the IIR digital filter and the filter coefficient of the FIR digital filter variably so that the amplitude fluctuation converges to zero.
  • the coefficient update described above is performed.
  • This section detects the amplitude fluctuation of the digital IF signal Y and automatically adjusts the filter coefficient of the IIR digital filter so that the amplitude fluctuation converges to 0, thereby reducing the output signal SIIR. Is output from the IIR digital filter.
  • the coefficient updating unit Detects the amplitude fluctuation of the digital IF signal Y, and automatically adjusts the filter coefficient of the FIR type digital filter so that the amplitude fluctuation converges to 0, thereby reducing the output signal SFIR with reduced fading. Output from FIR digital filter.
  • the radio receiver when the electric field strength is larger than the predetermined threshold value THD, performs digital processing by the processing of the IIR digital filter in the adaptive filter 9 and the coefficient updating unit.
  • the digital IF signal X is digitally filtered by the FIR digital filter in the adaptive filter 9 and the coefficient updating unit, and then fed.
  • the output signal S FIR that suppresses the influence of is supplied to the detector 11 as the digital IF signal Y.
  • This force provides the following effects. That is, when multipath feeding occurs, the electric field strength increases, so that the digital filtering process for the digital IF signal X is performed by the IIR digital filter in the adaptive filter 9. For this reason, even when the impulse response is infinite when multipath fading occurs in which the direct wave and reflected wave have a proportional force S1 to 1, the force S to converge the multipath fading can be obtained. Since the amplitude of the digital IF signal Y (the amplitude when an analog IF signal is used) can be kept constant, when the detector 11 detects the digital IF signal Y with FM, the detection signal (base Band) Sdet can be generated.
  • the wireless receiver of the present embodiment it is possible to stably suppress multipath fading and flat fading, and to improve reception quality. It can be done.
  • FIG. 3 (a) is a block diagram showing the configuration of the wireless receiver of this embodiment, and the same or corresponding parts as those in FIG. 2 are denoted by the same reference numerals.
  • Fig. 3 (b) is a block diagram showing the configuration of the adaptive filter.
  • this radio receiver amplifies the IF signal output from the front end 6 having the channel selection circuit 6a and the frequency converter 6b with the IF amplification unit 7 performing band limitation, A / D
  • the converter 8 converts the digital IF signal X from analog to digital and outputs it.
  • the determination unit 12 includes an electric field strength measurement unit 12a that calculates an electric field strength (S meter) from the digital IF signal X, an electric field strength value Smtr calculated by the electric field strength measurement unit 12a, and a predetermined threshold value TH D And a comparison circuit 12b that outputs a switching control signal SEL.
  • the threshold THD is determined to be a value between the electric field strength when multipath fading occurs and the electric field strength when flat feeding occurs by experiments.
  • the comparison circuit 12b outputs a switching control signal SEL that is a logic “H” indicating the first determination result, and the field strength value Smt r is smaller than the threshold value THD.
  • the switching control signal SEL that is logic “L” indicating the second determination result is output.
  • the switching circuit 10 is formed of an analog switch or the like that performs switching operation according to the switching control signal SEL.
  • the switching control signal SEL indicating the first determination result is supplied, the output output from the adaptive filter 9
  • the output signal SFIR output from the adaptive filter 9 is used as the digital IF signal Y as the detector 11 Forward to.
  • the adaptive filter 9 has the configuration shown in FIG. 3 (b), and the digital IF signal X input under the control of the determination unit 12 having the electric field strength measurement circuit 12a and the comparison circuit 12b. A digital filtering process is performed on the signal, and the output signal SIIR or SFIR with the fading suppressed is supplied to the detector 11 via the switching circuit 10.
  • the adaptive filter 9 includes an adder SUM1 that adds a digital IF signal X and a feedback signal FB supplied via a switch circuit SW described later, and a plurality of delay elements each having one sample delay ( z ⁇ 1 ) and shifts the output of adder SUM1 by shifting the multistage shift register SRG, and multiple multiplications that multiply the output of adder SUM1 and each delay element (z— 1 ) by the filter coefficient And an adder SUM2 that generates an output signal SFIR by adding the outputs of the multipliers b0 to b2n, and a coefficient updating unit OPRT.
  • an adder SUM1 that adds a digital IF signal X and a feedback signal FB supplied via a switch circuit SW described later
  • a plurality of delay elements each having one sample delay ( z ⁇ 1 ) and shifts the output of adder SUM1 by shifting the multistage shift register SRG, and multiple multiplications that multiply the output of adder SUM1 and each delay element (z— 1
  • the number of multipliers b0 to b2n is set to a relationship of 2n + 1 (odd).
  • delay element (z _1 ) The number is 28, and the number of multipliers b0 to b2n is 29.
  • an output signal SIIR is output from a middle point nTs that is a connection point between the nth delay element (z- 1 ) and the (n + 1 ) th delay element (z- 1 ).
  • the switch circuit SW performs conduction (on) or cutoff (off) operation according to the switching control signal SEL, and the switching circuit 10 is switched and connected to the contact P1 side, and the output signal SIIR is output as the digital IF signal Y.
  • the output signal SFIR of the adder SUM2 is supplied as the feedback signal FB to the power calculator SUM1
  • the feedback signal FB and the digital IF signal are added to the adder SUM1.
  • the transfer function of the output signal SIIR with respect to the digital IF signal X is expressed in z conversion notation, and is expressed by the following equation (3), and the IIR digital filter is Realized.
  • the filter coefficient of the multiplier b0 is set to 0 by the coefficient updating unit OPRT.
  • the coefficient update unit OPRT includes the switching control signal SEL, the digital IF signal Y that is the output of the switching circuit 10, the output X0 of the adder SUM1, and each delay element of the shift register SRG (the outputs Xl to Enter X2n.
  • the output signal SIIR output from the midpoint nTs of the IIR type digital filter is supplied as the digital IF signal Y.
  • the square root of the square ⁇ and convergence error Err (t) expressed by the following equations (5) and (6)
  • each multiplier bl Calculate and adjust the filter coefficient of ⁇ b2n.
  • Coefficient H is a coefficient for converging the feeding, and the convergence speed can be adjusted by adjusting the value of the coefficient H.
  • bi (tl) bi (t) -a 'Err (t)- ⁇ Xi (t) ⁇ Y (t) + Xi (t-1) ⁇ Y (tl) ⁇ ...) ( Where bi (t-1) and bi (t) are the tap coefficients of each multiplier b0 to b2n)
  • the coefficient updating unit OPRT automatically adjusts the filter coefficients of the multipliers b0 and bl to b2n, the multipath fading generated in the digital IF signal X is suppressed by the IIR digital filter.
  • the output signal SIIR is supplied to the detector 11 as the digital IF signal Y through the switching circuit 10, and the detection signal Sdet with reduced waveform distortion and the like is generated.
  • the coefficient updating unit OPRT outputs the output signal SFIR output from the adder SUM2 of the FIR digital filter. Based on the digital IF signals Y (t) and Y (t_ 1) shifted by one sump delay and the predetermined convergence value Vth, The square root ⁇ of the square and the convergence error Err (t) are calculated. Further, based on the convergence error Err (t), the output X0 of the adder SUM1, and each delay element (the outputs Xl to X2n of z—) By performing the calculation process represented by (7), the filter coefficients of the multipliers b0 to b2n are calculated and adjusted.
  • the coefficient updating unit OPRT automatically adjusts the filter coefficients of the multipliers b0 to b2n, the flat fading that has occurred in the digital IF signal X is suppressed by the FIR type digital filter.
  • the output signal SFIR is supplied to the detector 11 as the digital IF signal Y through the switching circuit 10, and the detection signal Sdet with reduced waveform distortion and the like is generated.
  • the radio receiver when the electric field strength is larger than the predetermined threshold value THD, the radio receiver according to the present embodiment includes the IIR type digital filter formed in the adaptive filter 9 and the coefficient updating unit OPRT.
  • the digital IF signal X is subjected to digital filtering processing, and the output signal SIIR with the effect of fading suppressed is supplied to the detector 11 as the digital IF signal Y.
  • the digital IF signal X is digitally filtered by the FIR digital filter formed in the adaptive filter 9 and the coefficient updater OPRT.
  • This force provides the following effects. That is, when multipath fading occurs, the electric field strength increases, and thus the digital filtering process for the digital IF signal X is performed by the IIR digital filter in the adaptive filter 9. For this reason, even when the impulse response is infinite when multipath fading occurs in which the direct wave and reflected wave have a proportional force S1 to 1, the force S to converge the multipath fading can be obtained. Since the amplitude of the digital IF signal Y (the amplitude when an analog IF signal is used) can be kept constant, when the detector 11 detects the digital IF signal Y with FM, the detection signal (base Band) Sdet can be generated.
  • the wireless receiver of the present embodiment it is possible to stably suppress multipath fading and flat fading, and to improve reception quality. It can be done.
  • the output signal SIIR filtered by the IIR digital filter is output from the midpoint nTs of the shift register SRQ, and the output signal SFIR filtered by the FIR digital filter is output from the adder SUM2. Therefore, the phase of the impulse response of the output signal SIIR and the impulse response of the output signal SFIR coincide. For this reason, even if the switching circuit 10 performs switching operation according to the switching control signal SEL, each output signal is not changed when the output signal SIIR is switched to the output signal SFIR and when the output signal SFIR is switched to the output signal SIIR.
  • a digital IF signal Y that is continuously switched and without distortion can be supplied to the detector 11.

Abstract

L’invention concerne un récepteur radio doté d’un filtre adaptatif capable de supprimer de façon stable l’évanouissement par trajets multiples et l’évanouissement plat. Elle comprend un filtre adaptatif (9) qui filtre de façon adaptée un signal numérique à fréquence intermédiaire (FI) (X) converti A/N ; et un élément déterminant (12) qui mesure l’intensité de champ du signal numérique FI (X) et définit, sur la base des résultats de mesure de l’intensité de champ, l’influence de l’évanouissement par trajets multiples ou de l’évanouissement plat. Lorsque l’élément déterminant (12) définit l’influence de l’évanouissement par trajets multiples, le filtre adaptatif (9) utilise un filtre à réponse impulsionnelle infinie (RII) pour filtrer de façon adaptée le signal numérique FI (X). Un signal de sortie (SIIR) du filtre adaptatif (9) est alors transmis au détecteur (11) via un élément de commutation (10). Lorsque l’élément déterminant (12) détermine l’influence de l’évanouissement plat, le filtre adaptatif (9) utilise un filtre adaptatif à réponse impulsionnelle finie (RIF) pour filtrer de façon adaptée le signal numérique FI (X). Un signal de sortie (SFIR) du filtre adaptatif (9) est alors transmis au détecteur (11) via l’élément de commutation (10).
PCT/JP2006/305032 2005-03-25 2006-03-14 Recepteur radio WO2006103922A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007510371A JP4523968B2 (ja) 2005-03-25 2006-03-14 無線受信機

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005089854 2005-03-25
JP2005-089854 2005-03-25

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WO2006103922A1 true WO2006103922A1 (fr) 2006-10-05

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PCT/JP2006/305032 WO2006103922A1 (fr) 2005-03-25 2006-03-14 Recepteur radio

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WO (1) WO2006103922A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011108111A1 (fr) * 2010-03-05 2011-09-09 パイオニア株式会社 Dispositif de réception fm et procédé de filtrage

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* Cited by examiner, † Cited by third party
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JPH03198438A (ja) * 1989-12-27 1991-08-29 Fujitsu Ltd 送信電力制御方式
JPH09307488A (ja) * 1996-05-10 1997-11-28 Matsushita Electric Ind Co Ltd 受信装置
JPH10163934A (ja) * 1996-12-03 1998-06-19 Matsushita Electric Ind Co Ltd 受信装置
JP2001257627A (ja) * 2000-03-13 2001-09-21 Kawasaki Steel Corp 無線受信機
JP2002232385A (ja) * 2001-01-30 2002-08-16 Sony Corp ダイバーシティ・アダプティブアレーを用いたｏｆｄｍ受信装置
JP2005064616A (ja) * 2003-08-19 2005-03-10 Pioneer Electronic Corp マルチパスひずみ除去フィルタ

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001257626A (ja) * 2000-03-13 2001-09-21 Matsushita Electric Ind Co Ltd 通信装置および通信方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03198438A (ja) * 1989-12-27 1991-08-29 Fujitsu Ltd 送信電力制御方式
JPH09307488A (ja) * 1996-05-10 1997-11-28 Matsushita Electric Ind Co Ltd 受信装置
JPH10163934A (ja) * 1996-12-03 1998-06-19 Matsushita Electric Ind Co Ltd 受信装置
JP2001257627A (ja) * 2000-03-13 2001-09-21 Kawasaki Steel Corp 無線受信機
JP2002232385A (ja) * 2001-01-30 2002-08-16 Sony Corp ダイバーシティ・アダプティブアレーを用いたｏｆｄｍ受信装置
JP2005064616A (ja) * 2003-08-19 2005-03-10 Pioneer Electronic Corp マルチパスひずみ除去フィルタ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011108111A1 (fr) * 2010-03-05 2011-09-09 パイオニア株式会社 Dispositif de réception fm et procédé de filtrage
US8611937B2 (en) 2010-03-05 2013-12-17 Pioneer Corporation FM receiving device and filtering method
JP5412574B2 (ja) * 2010-03-05 2014-02-12 パイオニア株式会社 Ｆｍ受信装置及びフィルタリング処理方法

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JPWO2006103922A1 (ja) 2008-09-04

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