KR970004285A - 디.엠.티. (dmt) 시스템에서 적응형 비트 교환 방법 및 장치 - Google Patents

디.엠.티. (dmt) 시스템에서 적응형 비트 교환 방법 및 장치 Download PDF

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KR970004285A
KR970004285A KR1019950019065A KR19950019065A KR970004285A KR 970004285 A KR970004285 A KR 970004285A KR 1019950019065 A KR1019950019065 A KR 1019950019065A KR 19950019065 A KR19950019065 A KR 19950019065A KR 970004285 A KR970004285 A KR 970004285A
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power spectral
spectral density
data
converting
inputting
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KR1019950019065A
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KR100331437B1 (ko
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천유식
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김광호
삼성전자 주식회사
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Priority to KR1019950019065A priority Critical patent/KR100331437B1/ko
Priority to IL11872396A priority patent/IL118723A/xx
Priority to FR9607847A priority patent/FR2736229B1/fr
Priority to GB9613602A priority patent/GB2303032B/en
Priority to JP8170337A priority patent/JP2891673B2/ja
Publication of KR970004285A publication Critical patent/KR970004285A/ko
Priority to US08/899,592 priority patent/US5903608A/en
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Publication of KR100331437B1 publication Critical patent/KR100331437B1/ko

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • 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
    • H04L27/2602—Signal structure
    • 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
    • H04L27/2649—Demodulators

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Telephonic Communication Services (AREA)
  • Communication Control (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

본 발명은 DMT시스템에서 적응형 비트 교환 방법 및 장치를 공개한다. 그 방법은 슈퍼프레임에서 68번째 프레임을 이용하여 전력 스펙트럼 밀도를 측정하여 SNR을 구하고, 이 SNR을 기존의 SNR과 비교하여 송신 및 수신단의 비트 및 전력 할당 테이블을 수정하고, 그 장치는 종래의 수신단에 SNR을 측정하여 송신단으로 출력하는 수단을 더 구비하는 것을 특징으로 하고, 종래의 방법 및 장치보다 간단하여 하드웨어적으로 간단하고, 실제적인 SNR을 이용하여 비트 및 전력을 스웨핑하므로 정확하게 비트 및 전력 할당 테이블을 수정할 수 있다.

Description

디.엠.티.(DMT) 시스템에서 적응형 비트 교환 방법 및 장치
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제2도는 본 발명에 의한 DMT시스템에서의 비트 교환 방법을 설명하기 위한 플로우차트이다. 제3도는 제2도에 도시된 방법을 수행하는 본 발명에 의한 DMT시스템에서 수신측의 블럭도이다. 제4도는 정상상태에서 데이타가 전송되는 "ADSL 표준"에서 정하는 슈퍼프레임의 구조도이다.

Claims (3)

  1. 채널을 통해 전송될 데이타를 인코딩 및 변환하는 송신부, 송신되는 상기 데이타를 수신하여 변환 및 디코딩하여 원래의 데이타로 복원하는 수신부로 구성되는 ADSL용 DMT시스템에서, 상기 채널을 통해 정상상태에서 상기 데이타를 전송하기 위해 상기 DMT시스템을 초기화하는 시스템초기화단계; 상기 데이타가 전송되는 프레임구조에서 싱크블럭이 삽입된 프레임을 선택하는 프레임 선택단계; 결정 회소 순열(DLS) 방법에 의해 상기 채널의 전력 스펙트럼 밀도를 측정하는 제1PSD측정단계; 웰시(Walsh)방법에 의해 잡음의 상기 전력 스펙트럼 밀도를 측정하는 제2PSD단계; 상기 전력 스펙트럼 밀도들을 각각의 부채널에 대해 전부 측정하였는가를 판단하여 만족하지 않으면 상기 프레임 선택단계로 진행하는 제1판단단계; 상기 제1판단단계를 만족하면 상기 각 부채널별로 기존의 전력 스펙트럼 밀도와 새로 구한 전력 스펙트럼 밀도의 차이를 계산하는 PSD차계산단계; 상기 전력 스펙트럼 밀도의 차값이 상기 전력 스펙트럼 밀도의 임계값보다 적은가를 판단하여 만족하면 상기 프레임 선택단계로 진행하는 제2판단단계; 및 상기 제2판단단계를 만족하지 않으면 상기 송신 및 수신부의 비트 및 전력 할당 테이블을 수정하여 상기 프레임 선택단계로 진행하는 테이블 수정단계를 구비하는 것을 특징으로 하는 DMT시스템에서 적응형 비트 교환 방법.
  2. 제1항에 있어서, 상기 시스템 초기화 단계는 상기 DMT시스템의 비트 및 전력을 초기 설정하는 초기화단계; 및 상기 DMT시스템의 정상상태에서 데이타의 전송을 시작하는 데이타전송시작단계를 구비하는 것을 특징으로 하는 DMT시스템에서 적응형 비트 교환 방법.
  3. 채널을 통해 송신할 데이타를 인코딩 및 변환하는 송신부와 송신되는 상기 데이타를 수신하여 변환 및 디코딩하는 수신부로 구성되는 ADSL용 DMT시스템의 상기 수신부에서, 상기 채널을 통해서 수신된 아날로그 상기 데이타 신호를 디지탈신호로 변환하는 A/D변환수단; 상기 디지탈 신호를 입력하고, 블럭간의 간섭을 제거하기 위해 사용되는 보호 대역을 줄이기 위한 시간영역 등화수단; 상기 시간영역 등화수단의 출력을 입력하여 상기 송신부에서 변조된 상기 데이타 신호를 복조하기 위한 고속 푸리에 변환수단; 상기 고속 푸리에 변환수단의 출력을 입력하여 각 부채널마다 발생하는 위상에러를 보상하기 위한 주파수 영역 변환수단; 비트 할당 테이블을 수정하기 위해 상기 A/D변환수단의 출력을 입력하여 전력 스펙트럼 밀도를 측정하고, 상기 전력 스펙트럼 밀도를 상기 송신부로 보내기 위한 SNR측정수단; 및 상기 SNR측정수단과 상기 주파수 영역 변환수단의 출력을 입력하여 슬라이스 값을 재설정하여 디코딩하는 디코딩수단을 구비하는 것을 특징으로 하는 DMT시스템에서 적응형 비트 교환장치.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019950019065A 1995-06-30 1995-06-30 디.엠.티.시스템에서적응형비트교환방법및장치 KR100331437B1 (ko)

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Application Number Priority Date Filing Date Title
KR1019950019065A KR100331437B1 (ko) 1995-06-30 1995-06-30 디.엠.티.시스템에서적응형비트교환방법및장치
IL11872396A IL118723A (en) 1995-06-30 1996-06-24 Adaptive bit swapping method and device for discrete multitone system
FR9607847A FR2736229B1 (fr) 1995-06-30 1996-06-25 Procede d'echange adaptatif de bits et dispositif pour systeme a tons multiples discrets
GB9613602A GB2303032B (en) 1995-06-30 1996-06-28 Adaptive bit swapping method and device for discrete multitone system
JP8170337A JP2891673B2 (ja) 1995-06-30 1996-06-28 Ｄｍｔシステムにおける適応型ビット交換方法及び装置
US08/899,592 US5903608A (en) 1995-06-30 1997-07-24 Adaptive bit swapping method and device for discrete multitone system

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KR1019950019065A KR100331437B1 (ko) 1995-06-30 1995-06-30 디.엠.티.시스템에서적응형비트교환방법및장치

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JP (1) JP2891673B2 (ko)
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FR (1) FR2736229B1 (ko)
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FR2736229A1 (fr) 1997-01-03
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KR100331437B1 (ko) 2002-08-08
GB2303032B (en) 2000-04-19
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US5903608A (en) 1999-05-11

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