KR950002283A - 디지탈통신용 적응 등화시스템 - Google Patents

디지탈통신용 적응 등화시스템 Download PDF

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Publication number
KR950002283A
KR950002283A KR1019930009867A KR930009867A KR950002283A KR 950002283 A KR950002283 A KR 950002283A KR 1019930009867 A KR1019930009867 A KR 1019930009867A KR 930009867 A KR930009867 A KR 930009867A KR 950002283 A KR950002283 A KR 950002283A
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KR
South Korea
Prior art keywords
cma
phase
threshold
sga
equalization coefficient
Prior art date
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KR1019930009867A
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English (en)
Other versions
KR970009687B1 (ko
Inventor
황유모
최양석
Original Assignee
김광호
삼성전자 주식회사
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.)
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Publication date
Application filed by 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019930009867A priority Critical patent/KR970009687B1/ko
Priority to US08/253,144 priority patent/US5506871A/en
Publication of KR950002283A publication Critical patent/KR950002283A/ko
Application granted granted Critical
Publication of KR970009687B1 publication Critical patent/KR970009687B1/ko

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Classifications

    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
    • H04L25/03038—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a non-recursive structure
    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03592—Adaptation methods
    • H04L2025/03598—Algorithms
    • H04L2025/03611—Iterative algorithms
    • H04L2025/03617—Time recursive algorithms
    • H04L2025/0363—Feature restoration, e.g. constant modulus
    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03592—Adaptation methods
    • H04L2025/03598—Algorithms
    • H04L2025/03681—Control of adaptation
    • H04L2025/03687—Control of adaptation of step size
    • H04L2025/03694—Stop and go

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

본 발명은 디지탈통신의 모뎀기술에서 수신신호를 등화하고 반송파회복을 수행하는 적응 등화시스템에 관한 것으로, CMA에 의해 등화계수를 초기화하고, 이 초기화된 등화계수를 SGA에 의해 미세하게 업데이팅하고, CMA에 의한 수렴이 소정의 임계치에 이르면 반송파회복을 수행하고, 반송파회복 중 위상에러의 평균값이 소정 임계치 이하로 되면 등화알고리즘을 SGA로 전환하는 과정들을 수행함으로써, 수신된 신호를 보다 신속하고 신뢰성있게 등화시킬 수 있다.

Description

디지탈통신용 적응 등화시스템
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 본 발명에 의한 적응 등화시스템의 일실시예를 나타내는 블럭도이다.

Claims (7)

  1. 디지탈통신의 수신측에서 수신신호를 등화하고 반송파회복을 수행하기 위한 방법에 있어서, 등화계수를 초기화하기 위한 CMA를 수행하는 단계; 초기화된 등화계수를 보다 미세하게 업데이팅하기 위한 SGA를 수행하는 단계; 상기 CMA의 에러값이 소정의 임계값 보다 작을 때, 상기 등화된 신호의 위상을 보상하는 단계; 및 상기 위상보상단계에서, 위상에러의 평균값이 소정의 다른 임계값 보다 작으면, 등화계수의의 업데이팅을 SGA로 전환하는 단계를 포함하는 것을 특징으로 하는 디지탈통신용 적응 등화방법.
  2. 제1항에 있어서, 상기 CMA는 다음과 같이 표현되는 알고리즘인 것을 특징으로 하는 디지탈통신용 적응 등화방법.
    여기서, Cn은 등화계수, λp는 CMA의 스텝사이즈, yn은 수신신호, Zn은 등화된 신호, an은 송신신호.
  3. 제1항에 있어서, 상기 SGA는 다음과 같이 표현되는 알고리즘인 것을 특징으로 하는 디지탈통신용 적응 등화방법.
  4. 제1항에 있어서, 상기 위상보상단계는 위상편차 및 주파수편차를 보상하는 단계; 및 위상지터를 보상하는 단계를 포함하는 것을 특징으로 하는 디지탈통신용 적응등화방법.
  5. 제1항에 있어서, 상기 CMA의 에러값은 다음과 같이 구해지는 것을 특징으로 하는 디지탈통신용 적응 등화방법.
  6. 제1항에 있어서, 상기 소정의 임계값은 상기 등화계수가 CMA에 의해 수렴가능한 임계값인 것을 특징으로 하는 디지탈통신용 적응 등화방법.
  7. 제1항에 있어서, 상기 소정의 다른 임계값은 상기 등화계수의 업데이팅을 CMA에서 SGA로 전환하기 위한 수렴정도의 임계값인 것을 특징으로 하는 디지탈통신용 적응 등화방법.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019930009867A 1993-06-02 1993-06-02 디지탈통신을 위한 적응 등화시스템 KR970009687B1 (ko)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1019930009867A KR970009687B1 (ko) 1993-06-02 1993-06-02 디지탈통신을 위한 적응 등화시스템
US08/253,144 US5506871A (en) 1993-06-02 1994-06-02 Adaptive equalizing system for digital communications

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930009867A KR970009687B1 (ko) 1993-06-02 1993-06-02 디지탈통신을 위한 적응 등화시스템

Publications (2)

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KR950002283A true KR950002283A (ko) 1995-01-04
KR970009687B1 KR970009687B1 (ko) 1997-06-17

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US (1) US5506871A (ko)
KR (1) KR970009687B1 (ko)

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US5539774A (en) * 1994-06-15 1996-07-23 International Business Machines Corporation Dual decision equalization method and device
US6014570A (en) * 1995-12-18 2000-01-11 The Board Of Trustees Of The Leland Stanford Junior University Efficient radio signal diversity combining using a small set of discrete amplitude and phase weights
US5712873A (en) * 1996-06-04 1998-01-27 Thomson Consumer Electronics, Inc. Multi-mode equalizer in a digital video signal processing system
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US6320903B1 (en) * 1996-09-02 2001-11-20 St Microelectronics N.V. Multi-carrier transmission systems
US6075816A (en) * 1996-11-27 2000-06-13 Lucent Technologies, Inc. Windowing technique for blind equalization
US6088389A (en) * 1997-05-13 2000-07-11 Lucent Technologies, Inc. System and method for training a plurality of equalizers and a modem employing the system or method
US6243428B1 (en) * 1997-06-11 2001-06-05 Ericsson Inc. Method and apparatus for band-adaptive demodulation
US5805480A (en) * 1997-07-03 1998-09-08 National Semiconductor Corporation Rotationally predictive adaptive filter
DE19738780A1 (de) * 1997-09-04 1999-03-11 Thomson Brandt Gmbh Verfahren und Schaltungsanordnung zur Korrektur von Phasen- und/oder Frequenzfehlern digitaler Multicarrier-Signale
US6178201B1 (en) * 1998-03-11 2001-01-23 Agilent Technologies Inc. Controlling an adaptive equalizer in a demodulator
JP3353724B2 (ja) * 1998-11-11 2002-12-03 三菱マテリアル株式会社 無線通信装置、無線通信システム、及び通信制御方法
JP3296330B2 (ja) * 1999-05-20 2002-06-24 日本電気株式会社 適応フィルタ、適応フィルタの制御方法及びプログラムを記憶した記憶媒体
US6493381B1 (en) * 1999-06-24 2002-12-10 Agere Systems Inc. Blind equalization algorithm with the joint use of the constant R and the sliced symbols
US6490318B1 (en) * 1999-06-24 2002-12-03 Agere Systems Inc. Phase-compensating constant modulus algorithm
FR2819660B1 (fr) * 2001-01-17 2003-05-02 Sagem Procede d'egalisation d'un flux de symboles de donnees et modem pour la mise en oeuvre du procede
US7130337B2 (en) 2001-07-02 2006-10-31 Phonex Broadband Corporation Method and system for sample and recreation synchronization for digital transmission of analog modem signal
US6865588B2 (en) * 2002-01-03 2005-03-08 Intel Corporation Adaptive filtering with tap leakage using error filtering
US7330068B2 (en) * 2002-04-16 2008-02-12 Bose Corporation Adjusting coefficients of a filter
KR100462471B1 (ko) * 2002-09-05 2004-12-17 한국전자통신연구원 디지털 신호의 위상오차 보상장치 및 방법
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US7796688B2 (en) * 2007-05-22 2010-09-14 Freescale Semiconductor, Inc. Radio receiver having a channel equalizer and method therefor
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KR970009687B1 (ko) 1997-06-17
US5506871A (en) 1996-04-09

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