KR930015472A - 시간에 따라 변하는 신호의 디코딩방법 - Google Patents

시간에 따라 변하는 신호의 디코딩방법 Download PDF

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KR930015472A
KR930015472A KR1019920024406A KR920024406A KR930015472A KR 930015472 A KR930015472 A KR 930015472A KR 1019920024406 A KR1019920024406 A KR 1019920024406A KR 920024406 A KR920024406 A KR 920024406A KR 930015472 A KR930015472 A KR 930015472A
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러쎌 휴스져 스티븐
세샤드리 남비라얀
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더블유. 리얀
아메리칸 텔리폰 앤드 텔레그라프 캄파니
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/38Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40Transmitting circuits; Receiving circuits
    • H04L25/49Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045Arrangements at the receiver end
    • H04L1/0054Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/25Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/37Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
    • H03M13/39Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes
    • H03M13/41Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes using the Viterbi algorithm or Viterbi processors
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045Arrangements at the receiver end
    • H04L1/0047Decoding adapted to other signal detection operation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0212Channel estimation of impulse response
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/024Channel estimation channel estimation algorithms
    • H04L25/025Channel estimation channel estimation algorithms using least-mean-square [LMS] method
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006Arrangements for removing intersymbol interference
    • H04L25/03178Arrangements involving sequence estimation techniques
    • H04L25/03248Arrangements for operating in conjunction with other apparatus
    • H04L25/03254Operation with other circuitry for removing intersymbol interference
    • H04L25/03267Operation with other circuitry for removing intersymbol interference with decision feedback equalisers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006Arrangements for removing intersymbol interference
    • H04L25/03178Arrangements involving sequence estimation techniques
    • H04L25/03248Arrangements for operating in conjunction with other apparatus
    • H04L25/03292Arrangements for operating in conjunction with other apparatus with channel estimation circuitry
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006Arrangements for removing intersymbol interference
    • H04L25/03178Arrangements involving sequence estimation techniques
    • H04L25/03312Arrangements specific to the provision of output signals
    • H04L25/03324Provision of tentative decisions

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Probability & Statistics with Applications (AREA)
  • Theoretical Computer Science (AREA)
  • Artificial Intelligence (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Error Detection And Correction (AREA)
  • Dc Digital Transmission (AREA)
  • Noise Elimination (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

전송된 기호에 에러없는 수신에 장애가 되는 통신 채널용 평활기/디코더는 복수개의 동등한 서브 채널로 수신된 신호의 샘플에서 동작되는 변경된 비터비 디코더를 포함한다. 서브 채널의 각 평가는 비터비 격자 처리에서 국부적으로 최상의 평가를 사용하여 갱신되며, 그것에 의해 디지탈 셀룰러 통신 채널과 같이 급속히 변하는 채널에서 채널 평가를 갱신하는데 있어서의 지연을 회피하게 된다. 누설 예측기 채널 갱신법도 역시 대체 가능한 실시예에서 유리하다.

Description

시간에 따라 변하는 신호의 디코딩방법
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 본 발명을 사용하는 통신 시스템의 블럭 다이어그램 표현도, 제2도는 디지탈 셀룰러 통신 시스템에서 전형적인 이동국에서 기지국으로 그리고 기지국에서 이동장치로 통신하기 위한 슬롯 포맷(slot formats)도, 제3도는 통신 시스템을 DQPSK변조 회로에서 기초에 대한 단계할당(phase assignmets)도.

Claims (11)

  1. 기호율 I/T로 통신 채널에 공급되며, K=1, 2, 3,...인 기호의 시이퀀스 Ck를 나타내며 통신 채널에서 나오는 시간에 따라 변하는 신호 r(t)를 수신하는 것을 구비하는 시간에 따라 변하는 신호를 디코딩하는 방법에 있어서, 지속 기간 T의 K번째 주기에 대해 R이 정수이며 ℓ=1, 2,..., R인 r(t)의 R샘플세트, rk(ℓ)를 발생하기 위해 R/T율로 샘플링 r(t)하는 단계, 후보 (M+1)-기호 시이퀀스의 세트 Ck-m, Ck-(m-1),..., Ck-1, Ck각각에 대해 각각 상기 채널의 출력에 대한 부분적인 평가를 나타내며, ℓ=1, 2,..., R인 한 세트의 R값 Sk(ℓ)을 발생시키는 단계, 후보 시이퀀스 각각에 대해 ℓ=1, 2,..., R인 값 rk(ℓ)과 Sk(ℓ)간 차이를 반영하는 에러 신호를 형성하는 단계와, 상기 에러신호에 대해 최소값을 내는 후보 시이퀀스내의 기호를 상기 채널에 공급된 기호로서 선택하는 단계를 구비하는 것을 특징으로 하는 시간에 따라 변하는 신호의 디코딩방법.
  2. 제1항에 있어서, 상기 r(t)는 시간에 따라 변하는 다중 경로 통신 채널로 부터 수신되는 것을 특징으로 하는 시간에 따라 변하는 신호의 디코딩방법.
  3. 제1항에 있어서, 상기 선택 단계는 상기 에러 신호에 대해 상기 최소값을 내는 상기 후보 시이퀀스로부터 기호 Ck를 선택하는 것을 구비하는 것을 특징으로 하는 시간에 따라 변하는 신호의 디코딩방법.
  4. 제1항에 있어서, 상기 에러 신호 형성단계는 ℓ의 값에 각각에 대해, 상기 각각의 rk(ℓ)와 Sk(ℓ)간의 차의 제곱을 형성하고 그 차를 더하는 것을 특징으로 하는 시간에 따라 변하는 신호의 디코딩방법.
  5. 제1항에 있어서, 상기 Sk(ℓ)는 채널 임펄스 응답 평가의 샘플을 갖는 상기 Ck사이퀀스의 콘벌루션에 기초하고 있는 것을 특징으로 하는 시간에 따라 변하는 신호의 디코딩방법.
  6. 제5항에 있어서, 상기 콘벌루션은인 것을 특징으로 하는 시간에 따라 변하는 신호의 디코딩방법.
  7. 제1항에 있어서, 상기 한 세트의 R값 Sk(ℓ)을 발생하는 단계는 상기 채널 특성의 각 부분 평가에 기초한 상기 출력의 각 부분 평가를 결정하는 것을 구비하는 것을 특징으로 하는 시간에 따라 변하는 신호의 디코딩방법.
  8. 제7항에 있어서, 상기 에러 신호에 응답하여 상기 채널 특성의 상기 부분 평가를 갱신하는 단계를 부가적으로 구하는 것을 특징으로 하는 시간에 따라 변하는 신호의 디코딩방법.
  9. 제7항에 있어서, 상기 각 rk(ℓ)와 채널 출력의 노이즈 없는 평가 간의 차이를 나타내는 신호에 따라 상기 채널 특성의 상기 부분 평가를 갱신하는 단계를 부가적으로 구비하는 것을 특징으로 하는 시간에 따라 변하는 신호의 디코딩방법.
  10. 제9항에 있어서, 상기 노이즈 없는 채널출력의 평가는 실제로 전송된 기호에 대한 잠정적인 결정에 따라 발생되는 것을 특징으로 하는 시간에 따라 변하는 신호의 디코딩방법.
  11. 제7항에 있어서, 상기 각 채널 특성의 현재 평가에 기초한 예측을 나타내는 신호에 따라 상기 채널 특성에 대한 상기 각각의 부분 평가를 갱신하는 단계를 부가적으로 구비하는 것을 특징으로 하는 시간에 따라 변하는 신호의 디코딩방법.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019920024406A 1991-12-31 1992-12-16 시간에 따라 변하는 신호의 디코딩방법 KR100281149B1 (ko)

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Families Citing this family (60)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5862192A (en) * 1991-12-31 1999-01-19 Lucent Technologies Inc. Methods and apparatus for equalization and decoding of digital communications channels using antenna diversity
SE470371B (sv) * 1992-06-23 1994-01-31 Ericsson Telefon Ab L M Sätt och anordning vid digital signalöverföring att hos en mottagare estimera överförda symboler
JPH07123257B2 (ja) * 1992-12-25 1995-12-25 日本電気株式会社 ディジタルデータ復調装置
EP0656712A1 (en) * 1993-11-16 1995-06-07 AT&T Corp. Viterbi equaliser using variable length tracebacks
US5499272A (en) * 1994-05-31 1996-03-12 Ericsson Ge Mobile Communications Inc. Diversity receiver for signals with multipath time dispersion
IL110202A (en) * 1994-07-04 1997-07-13 Tadiran Ltd Equalization and error detection apparatus for high rate digital communications
FI105514B (fi) * 1994-09-12 2000-08-31 Nokia Mobile Phones Ltd Vastaanottomenetelmä ja vastaanotin
DE19529983A1 (de) * 1995-08-16 1997-02-20 Bosch Gmbh Robert Datendecoder
GB2309865A (en) * 1996-01-30 1997-08-06 Sony Corp Radio receiver with Doppler frequency shift correction
GB2309867A (en) * 1996-01-30 1997-08-06 Sony Corp Reliability data in decoding apparatus
JPH09294095A (ja) * 1996-04-26 1997-11-11 Oki Electric Ind Co Ltd 適応等化器
US6084929A (en) * 1996-12-12 2000-07-04 Ericsson Inc. Method and apparatus for channel tracking
JPH11112361A (ja) * 1997-10-01 1999-04-23 Matsushita Electric Ind Co Ltd データ復号装置及びデータ復号方法
US6563858B1 (en) 1998-01-16 2003-05-13 Intersil Americas Inc. Method of performing antenna diversity in spread spectrum in wireless local area network
US6603801B1 (en) 1998-01-16 2003-08-05 Intersil Americas Inc. Spread spectrum transceiver for use in wireless local area network and having multipath mitigation
FI104772B (fi) * 1998-03-23 2000-03-31 Nokia Networks Oy Itseoptimoiva kanavakorjaus- ja ilmaisumenetelmä ja itseoptimoiva kanavakorjain/ilmaisin
US6101217A (en) * 1998-05-11 2000-08-08 Globespan Semiconductor, Inc. System and method for demodulating digital information from an odd constellation
US6201563B1 (en) * 1998-06-08 2001-03-13 Lsi Logic Corporation Trellis code modulation decoder structure for advanced digital television receiver
US6260168B1 (en) * 1998-09-23 2001-07-10 Glenayre Electronics, Inc. Paging system having optional forward error correcting code transmission at the data link layer
US6647071B2 (en) * 1998-11-06 2003-11-11 Texas Instruments Incorporated Method and apparatus for equalization and tracking of coded digital communications signals
US6320919B1 (en) 1998-11-30 2001-11-20 Ericsson Inc. Adaptive channel characterization using decoded symbols
US6522706B1 (en) * 1998-12-10 2003-02-18 National Semiconductor Corporation Delay spread estimation for multipath fading channels
US6275525B1 (en) 1998-12-24 2001-08-14 National Semiconductor Corporation Enhanced method for adaptive equalization technique in mobile wireless systems
US6347125B1 (en) * 1999-01-11 2002-02-12 Ericsson Inc. Reduced complexity demodulator for multi-bit symbols
USD428533S (en) * 1999-01-19 2000-07-18 Carroll Lorna J Hair bow organizer
US6970522B1 (en) * 1999-04-16 2005-11-29 Hewlett-Packard Development Company, L.P. Data retrieval
US6570919B1 (en) * 1999-07-30 2003-05-27 Agere Systems Inc. Iterative decoding of data packets employing decision feedback equalization
US6487259B1 (en) 1999-08-24 2002-11-26 Motorola, Inc. Partially-parrallel trellis decoder apparatus and method
US6327317B1 (en) * 1999-09-10 2001-12-04 Telefonaktiebolaget Lm Ericsson (Publ) Combined equalization and decoding techniques
US6570910B1 (en) 1999-10-25 2003-05-27 Ericsson Inc. Baseband processor with look-ahead parameter estimation capabilities
SE516962C2 (sv) * 1999-11-25 2002-03-26 Ericsson Telefon Ab L M Digital kommunikationsmottagare med inbyggd styrenhet för in- och urkoppling av kanalföljare beroende av kommunikationskanalens kvalitet
US6690739B1 (en) 2000-01-14 2004-02-10 Shou Yee Mui Method for intersymbol interference compensation
US6707849B1 (en) * 2000-02-08 2004-03-16 Ericsson Inc. Methods, receivers and equalizers having increased computational efficiency
GB2360425A (en) * 2000-03-16 2001-09-19 Siemens Ag Channel state information estimation for turbo-code decoders
US6314131B1 (en) * 2000-03-24 2001-11-06 Cadence Design Systems, Inc. Method and system for channel estimation using multi-slot averaged interpolation
US7072392B2 (en) * 2000-11-13 2006-07-04 Micronas Semiconductors, Inc. Equalizer for time domain signal processing
US6940557B2 (en) * 2001-02-08 2005-09-06 Micronas Semiconductors, Inc. Adaptive interlace-to-progressive scan conversion algorithm
DE10107144A1 (de) * 2001-02-15 2002-08-29 Infineon Technologies Ag Einheit zur Bestimmung der Abtastphase
US7133442B2 (en) * 2001-03-29 2006-11-07 Hewlett-Packard Development Company, L.P. Rapid identification of transmission media channel characteristics
US6961545B2 (en) * 2001-04-09 2005-11-01 Atheros Communications, Inc. Method and system for providing antenna diversity
GB2376158B (en) * 2001-05-30 2004-07-28 Salah A Al-Chalabi Opto-electronic receiver which compensates for dispersion
US6829297B2 (en) * 2001-06-06 2004-12-07 Micronas Semiconductors, Inc. Adaptive equalizer having a variable step size influenced by output from a trellis decoder
US7190744B2 (en) * 2001-06-07 2007-03-13 Micronas Semiconductors, Inc. Error generation for adaptive equalizer
US7418034B2 (en) * 2001-06-19 2008-08-26 Micronas Semiconductors. Inc. Combined trellis decoder and decision feedback equalizer
US7440489B2 (en) 2001-08-07 2008-10-21 Ericsson Inc. Method and apparatus for selective demodulation and decoding of communications signals
US7017104B1 (en) * 2001-08-24 2006-03-21 Mediatek Inc. Method and system for decoding block codes by calculating a path metric according to a decision feedback sequence estimation algorithm
US20030235259A1 (en) * 2002-04-04 2003-12-25 Jingsong Xia System and method for symbol clock recovery
US20030206053A1 (en) * 2002-04-04 2003-11-06 Jingsong Xia Carrier recovery for DTV receivers
US7272203B2 (en) * 2002-04-05 2007-09-18 Micronas Semiconductors, Inc. Data-directed frequency-and-phase lock loop for decoding an offset-QAM modulated signal having a pilot
US6980059B2 (en) * 2002-04-05 2005-12-27 Micronas Semiconductors, Inc. Data directed frequency acquisition loop that synchronizes to a received signal by using the redundancy of the data in the frequency domain
US7321642B2 (en) * 2002-04-05 2008-01-22 Micronas Semiconductors, Inc. Synchronization symbol re-insertion for a decision feedback equalizer combined with a trellis decoder
US6995617B2 (en) * 2002-04-05 2006-02-07 Micronas Semiconductors, Inc. Data-directed frequency-and-phase lock loop
US7376181B2 (en) * 2002-04-05 2008-05-20 Micronas Semiconductors, Inc. Transposed structure for a decision feedback equalizer combined with a trellis decoder
US7876726B2 (en) * 2002-04-29 2011-01-25 Texas Instruments Incorporated Adaptive allocation of communications link channels to I- or Q-subchannel
US20030235243A1 (en) * 2002-06-25 2003-12-25 Shousheng He Method for windowed noise auto-correlation
GB2392066B (en) * 2002-08-16 2005-11-09 Toshiba Res Europ Ltd Equaliser apparatus and methods
FR2848715B1 (fr) * 2002-12-11 2005-02-18 France Telecom Procede et systeme de correction multi-references des deformations spectrales de la voix introduites par un reseau de communication
JP4754630B2 (ja) 2006-06-02 2011-08-24 パナソニック株式会社 情報再生装置
US8812941B2 (en) 2011-07-20 2014-08-19 Marvell World Trade Ltd. Viterbi device and method using a posteriori information
BR112014009537A2 (pt) * 2011-10-19 2017-04-18 Optis Cellular Tech Llc método e aparelho para previsão de canal

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4833693A (en) * 1985-11-21 1989-05-23 Codex Corporation Coded modulation system using interleaving for decision-feedback equalization
US4745625A (en) * 1986-03-12 1988-05-17 Codex Corporation Transition detector
GB8609711D0 (en) * 1986-04-21 1986-05-29 Clark A P Channel estimation & detection
US4847871A (en) * 1987-01-28 1989-07-11 Matsushita Electric Industrial Co., Ltd. Viterbi detector for digital signal
NL8701333A (nl) * 1987-06-09 1989-01-02 Philips Nv Inrichting voor het bestrijden van intersymboolinterferentie en ruis.
US5031195A (en) * 1989-06-05 1991-07-09 International Business Machines Corporation Fully adaptive modem receiver using whitening matched filtering
US5056117A (en) * 1989-08-07 1991-10-08 At&T Bell Laboratories Decision feedback equalization with trellis coding
JP2795935B2 (ja) * 1989-11-24 1998-09-10 三菱電機株式会社 最尤系列推定装置
JPH03195129A (ja) * 1989-12-22 1991-08-26 Mitsubishi Electric Corp 最尤系列推定装置
SE465597B (sv) * 1990-02-16 1991-09-30 Ericsson Telefon Ab L M Foerfarande att reducera inverkan av faedning hos en viterbimottagare med minst tvaa antenner
CA2039373C (en) * 1990-03-30 1996-09-10 Kazuhiro Okanoue Digital data communication system with adaptive channel response estimation
US5263033A (en) * 1990-06-22 1993-11-16 At&T Bell Laboratories Joint data and channel estimation using fast blind trellis search
CA2048210C (en) * 1990-07-31 1995-11-28 Yukitsuna Furuya Blind type sequence estimator for use in communications system
US5195107A (en) * 1990-12-11 1993-03-16 At&T Bell Laboratories Technique for compensating for intersymbol interference
US5325402A (en) * 1991-04-30 1994-06-28 Nec Corporation Method and arrangement for estimating data sequences transmsitted using Viterbi algorithm
US5222101A (en) * 1991-05-03 1993-06-22 Bell Communications Research Phase equalizer for TDMA portable radio systems
JP2621685B2 (ja) * 1991-05-29 1997-06-18 日本電気株式会社 適応型最尤系列推定装置
JP2876856B2 (ja) * 1991-10-31 1999-03-31 日本電気株式会社 系列推定方法および装置
US5263053A (en) * 1992-03-24 1993-11-16 Novatel Communications Ltd. Fractionally spaced maximum likelihood sequence estimation receiver
US5257272A (en) * 1992-04-15 1993-10-26 International Business Machines Corporation Time-varying modulo N trellis codes for input restricted partial response channels
JPH07123257B2 (ja) * 1992-12-25 1995-12-25 日本電気株式会社 ディジタルデータ復調装置

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JP3260870B2 (ja) 2002-02-25
JPH05344008A (ja) 1993-12-24
FI925933A0 (fi) 1992-12-30
EP0550143A2 (en) 1993-07-07
FI113925B (fi) 2004-06-30
FI925933A (fi) 1993-07-01
KR100281149B1 (ko) 2001-02-01
US5774504A (en) 1998-06-30
DE69230722D1 (de) 2000-04-06
CA2083304C (en) 1999-01-26
EP0550143A3 (en) 1993-09-29
DE69230722T2 (de) 2000-11-02
EP0550143B1 (en) 2000-03-01
CA2083304A1 (en) 1993-07-01

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