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KR950010510A - Coefficient Update Circuit of Adaptive Channel Equalizer - Google Patents

Coefficient Update Circuit of Adaptive Channel Equalizer Download PDF

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Publication number
KR950010510A
KR950010510A KR1019930019074A KR930019074A KR950010510A KR 950010510 A KR950010510 A KR 950010510A KR 1019930019074 A KR1019930019074 A KR 1019930019074A KR 930019074 A KR930019074 A KR 930019074A KR 950010510 A KR950010510 A KR 950010510A
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KR
South Korea
Prior art keywords
coefficient
output
latch
outputting
update
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KR1019930019074A
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Korean (ko)
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KR960009808B1 (en
Inventor
이상기
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이헌조
주식회사 금성사
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Priority to KR93019074A priority Critical patent/KR960009808B1/en
Publication of KR950010510A publication Critical patent/KR950010510A/en
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Publication of KR960009808B1 publication Critical patent/KR960009808B1/en

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    • 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
    • H04L25/03159Arrangements for removing intersymbol interference operating in the frequency domain
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F5/00Methods or arrangements for data conversion without changing the order or content of the data handled
    • G06F5/06Methods or arrangements for data conversion without changing the order or content of the data handled for changing the speed of data flow, i.e. speed regularising or timing, e.g. delay lines, FIFO buffers; over- or underrun control therefor
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00Networks using digital techniques
    • H03H2017/0072Theoretical filter design
    • H03H2017/0081Theoretical filter design of FIR filters

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

본 발명은 적응형 채널 등화기의 계수 갱신 회로에 관한 것으로, 본 발명은 최소 평균 제곱오차(LMS)알고리즘을 적용하여 다중경로를 통해 전송됨에 의해 수신 신호마다 등화 필터 계수를 1탭(Tap)씩 갱심함으로서 왜곡된 신호의 특성을 적응적으로 보상하도록 구성한 것이다.The present invention relates to a coefficient update circuit of an adaptive channel equalizer. The present invention is applied by a minimum mean square error (LMS) algorithm to transmit equalization filter coefficients by 1 tap for each received signal. It is configured to adaptively compensate for the characteristics of the distorted signal by being severe.

따라서, 본 발명은 샘플링된 하나의 수신 신호마다 등화 필터계수를 갱신함으로서 등화기의 수렴(convergence)속도를 향상시킬 수 있다.Therefore, the present invention can improve the convergence speed of the equalizer by updating the equalization filter coefficient for each sampled received signal.

Description

적응형 채널 등화기의 계수 갱신 회로Coefficient Update Circuit of Adaptive Channel Equalizer

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명에 따른 계수 갱신 회로의 블럭도.2 is a block diagram of a coefficient updating circuit according to the present invention.

제3도는 제2도에 있어서, 갱신값 계산부의 블럭도.3 is a block diagram of an update value calculator of FIG. 2;

제4도는 제2도에 있어서 수신 신호 저장부의 다른 실시예.4 is another embodiment of the received signal storage in FIG.

Claims (3)

수신 신호(X[n])의 왜곡을 보상하는 유한 충격 응답 필터(10)의 출력(Z[n])을 검출한 오차 계산부(20)가 오차를 산출하면 계수 갱신 회로(30)가 수신 신호(X[n])와 상기 오차 계산부(20)의 오차 신호(e[n])를 연산하여 갱신된 필터 계수(C[n])를 상기 유한 충격 응답 필터(10)에 출력하는 적응형 채널 등화기에 있어서, 수신 신호(X[n])를 저장하는 수신 신호 저장부(1)와, 오차 신호(e[n])를 샘플링하는 래치(2)와, 상기 수신 신호 저장부(1)와 래치(2)를 제어하는 제어부(3)와, 상기 수신 신호 저장부(1)의 출력(X[n-k])과 래치(2)의 출력(E[n])을 연산하여 갱신률 조절 신호(CTL)에 따라 갱신 계수([n])를 출력하는 갱신값 계산부(4)와, 이 갱신값 계산부(4)의 출력([n])과 이전의 필터계수(Ci)를 합산하여 새로운 필터 계수(C[n])를 출력하는 덧셈기(6)와, 채널신호(NCH)를 디코딩하는 채널 인덱스 발생부(5)와, 이 채널 인덱스 발생부(5)의 인덱스 비트(IAddr)에 따라 이전 채널의 계수인 상기 덧셈기(6)의 출력(C[n])을 출력할때 어드레스(Raddr)에 의해 N개의 계수를 저장하고 상기 덧셈기(6)에 이전 필터 계수(Ci)를 출력하는 듀얼 포트 램(7)과, 이 듀얼 포트 램(7)에 어드레서(RAddr)를 발생시킴과 아울러 상기 유한 충격 응답 필터(10)에 어드레스(FAddr)를 발생시키는 번지 발생부(8)로 구성함을 특징으로 하는 적응형 채널 등화기의 계수 갱신 회로.If the error calculation unit 20 that detects the output Z [n] of the finite shock response filter 10 that compensates for the distortion of the received signal X [n] calculates an error, the coefficient update circuit 30 receives the error. Adaptive to calculate the signal X [n] and the error signal e [n] of the error calculator 20 and output the updated filter coefficient C [n] to the finite shock response filter 10. In the channel equalizer, a reception signal storage unit 1 for storing a reception signal X [n], a latch 2 for sampling an error signal e [n], and the reception signal storage unit 1 And the control unit 3 for controlling the latch 2, the output rate X [nk] of the reception signal storage unit 1 and the output E [n] of the latch 2, and the update rate is adjusted. According to the signal (CTL) an update value calculation unit 4 for outputting [n]), and an output value of the update value calculation unit 4 ( [n]) and an adder 6 for summing the previous filter coefficient Ci and outputting a new filter coefficient C [n], a channel index generator 5 for decoding the channel signal NCH, When outputting the output C [n] of the adder 6, which is the coefficient of the previous channel, according to the index bit IAddr of the channel index generator 5, N coefficients are stored by the address Raddr. The dual port RAM 7 outputting the previous filter coefficient Ci to the adder 6 and an addresser Raddr are generated in the dual port RAM 7 and the finite shock response filter 10 is generated. A coefficient updating circuit of an adaptive channel equalizer, characterized by comprising a address generator (8) for generating an address (FAddr). 제1항에 있어서, 갱신값 계수부(4)는 수신 신호 저장부(1)의 출력(X[n])과 래치(2)의 출력(V[n])을 각기 샘플링하는 래치(12)(13)와, 이 래치(12)(13)의 (n+1)비트 출력(V1[n])(V2[n])을 갱신률 조절 신호(CTL)에 따라 선택, 출력하는 멀티플렉서(14)와, 이 멀티플렉서(14)의 출력(V0[n])을 샘플링하여 갱신 계수([n])를 출력하는 래치(15)로 구성함을 특징으로 하는 적응형 채널 등화기의 계수 갱신 회로.The latch 12 of claim 1, wherein the update value counting unit 4 samples the output X [n] of the received signal storage unit 1 and the output V [n] of the latch 2, respectively. (13) and a multiplexer for selecting and outputting the (n + 1) bit outputs (V 1 [n]) (V 2 [n]) of the latches (12) and (13) according to the update rate adjustment signal (CTL). (14) and the output (V 0 [n]) of the multiplexer 14 are sampled to obtain an update coefficient ( [n]) and a latch 15 for outputting the coefficient update circuit of the adaptive channel equalizer. 제1항에 있어서, 수신 신호 저장부(1)는 N번째 필터 계수(CN-1)부터 갱신할 경우 선입선출 메모리(FIFO)로 구성하고 1번째 필터 계수(C0)부터 갱신할 경우 후입선출 메모리(LIFO)로 구성함을 특징으로 하는 적응형 채널 등화기의 계수 갱신 회로.The received signal storage unit 1 is configured as a first-in first-out memory (FIFO) when updating from the Nth filter coefficient (C N-1 ), and the last-input when updating from the first filter coefficient (C 0 ). Coefficient updating circuitry of an adaptive channel equalizer, characterized by an electoral memory (LIFO). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR93019074A 1993-09-20 1993-09-20 Coefficient updating circuit for adaptive channel equalizer KR960009808B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR93019074A KR960009808B1 (en) 1993-09-20 1993-09-20 Coefficient updating circuit for adaptive channel equalizer

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Application Number Priority Date Filing Date Title
KR93019074A KR960009808B1 (en) 1993-09-20 1993-09-20 Coefficient updating circuit for adaptive channel equalizer

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KR950010510A true KR950010510A (en) 1995-04-28
KR960009808B1 KR960009808B1 (en) 1996-07-24

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100617778B1 (en) * 1999-07-07 2006-08-28 삼성전자주식회사 Appasratus and method for compensating degradation of a received signal
KR100585638B1 (en) * 1998-12-31 2006-09-06 엘지전자 주식회사 Modulator of High Speed Communication System

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080040892A (en) * 2006-11-06 2008-05-09 삼성전자주식회사 Adaptive equalizer and adaptive equalizing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100585638B1 (en) * 1998-12-31 2006-09-06 엘지전자 주식회사 Modulator of High Speed Communication System
KR100617778B1 (en) * 1999-07-07 2006-08-28 삼성전자주식회사 Appasratus and method for compensating degradation of a received signal

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