KR930003604A - 트렐리스 코드화 큐에이엠(qam)을 이용하여 디지탈 데이터를 통신하기 위한 방법 및 그 장치 - Google Patents

트렐리스 코드화 큐에이엠(qam)을 이용하여 디지탈 데이터를 통신하기 위한 방법 및 그 장치 Download PDF

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KR930003604A
KR930003604A KR1019920013358A KR920013358A KR930003604A KR 930003604 A KR930003604 A KR 930003604A KR 1019920013358 A KR1019920013358 A KR 1019920013358A KR 920013358 A KR920013358 A KR 920013358A KR 930003604 A KR930003604 A KR 930003604A
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에이치. 파익 우
레리 스코트에이.
히가드 크리스
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헤롤드 엠. 크리스버그
제너럴 인스트루먼트 코포레이션
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0059—Convolutional codes
    • H04L1/006—Trellis-coded modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0065—Serial concatenated codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
    • H04L27/3416—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes
    • H04L27/3427—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes in which the constellation is the n - fold Cartesian product of a single underlying two-dimensional constellation
    • H04L27/3438—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power in which the information is carried by both the individual signal points and the subset to which the individual points belong, e.g. using coset coding, lattice coding, or related schemes in which the constellation is the n - fold Cartesian product of a single underlying two-dimensional constellation using an underlying generalised cross constellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/015—High-definition television systems

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Error Detection And Correction (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Image Processing (AREA)
  • Radio Relay Systems (AREA)
  • Television Systems (AREA)
  • Color Television Systems (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Communication Control (AREA)
  • Television Signal Processing For Recording (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

내용 없음.

Description

트렐리스 코드화 큐에이엠(QAM)을 이용하여 디지탈 데이터를 통신하기 위한 방법 및 그 장치
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 연결 코딩(concatenated coding)을 이용한 QAM 전송시스템의 블럭도,
제2도는 본 발명에 따른 트렐리스 엔코더의 블럭도,
제3도는 본 발명에 따른 트렐리스 디코더의 블럭도.

Claims (19)

  1. N-비트 QAM 콘스텔레이션 패턴을 상기 콘스텔레이션 패턴의 N/4 심볼 포인트에 포함되는 각 서브세트로 분할하는 단계와, 상기 4개의 서브세트 각각에 대해 다른 2-비트 코드단어를 할당하는 단계, 상기 콘스텔레이션 패턴에 속하는 상기 심볼에서의 서브세트에 할당된 2-비트 코드단어를 제공하도록 1/2비율 2진화 콘볼루쇼널 엔코딩 알고리즘에 따라 상기 심볼의 제1비트를 처리함으로써 전송되는 심볼을 엔코딩하는 단계, 변조함수를 제공하기 위해 상기 코드단어에 의해 정의된 서브세트에 포함된 N/4심볼 포인트중 하나와 관련되는 상기 심볼의 잔여비트에 따라 상기 2-비트 코드단어를 맵핑하는 단계 및, 통신채널로 전송하기 위해 상기 변조함수에 따른 캐리어를 변조하는 단계로 이루어진 것을 특징으로 하는 QAM을 이용하여 디지탈 데이터를 통신하기 위한 방법.
  2. 제1항에 있어서, 상기 2-비트 코드단어는 상기 변조함수의 최하위 비트를 형성함과 더불어 상기 콘스텔레이션 패턴의 좌표의 매트릭스의 열을 정의하고, 상기 잔여 비트는 상기 변조함수의 최상위 비트를 헝성함과 더불어 상기 콘스텔레이션 패턴의 크기를 결정하도록 된 것을 특징으로 하는 QAM을 이용하여 디지탈 데이터를 통신하기 위한 방법.
  3. 제1항에 있어서, 상기 심볼을 제공하기 위해 에러 정정 엔코딩 알고리즘을 이용하여 정봉 비트를 엔코딩하는 단계를 더 구비하여 이루어진 것을 특징으로 하는 QAM을 이용하여 디지탈 데이터를 통신하기 위한 방법.
  4. 제3항에 있어서, 상기 콘볼루쇼널 엔코딩 단계가 트렐리스 코드화 알고리즘을 사용하는 것을 특징으로 하는 QAM을 이용하여 디지탈 데이터를 통신하기 위한 방법.
  5. 제1항에 있어서, 수신기에서 상기 캐리어를 수신하는 단계와, 상기 변조함수를 복구하기 쉬해 상기 수신기에서 수신된 캐리어를 복조하는 단계, 상기 서브세트에 대응하는 거리의 세트를 제공함과 더불어 잔여 비트에 의해 정의된 신호 포인트의 다른 조건적 결정을 표현하는 다수의 바이트를 제공하기 위해 복구된 변조함수를 프루닝하는 단계, 상기 제1비트를 복구하도록 1/2비율 2진화콘볼루쇼널 코드를 디코딩하기 위한 알고리즘에서 상기 거리를 사용하는 단계, 상기 코드단어를 재생시키기 위해 1/2비율 2진화 콘볼루쇼널 엔코딩 알고리즘을 이용하여 복구된 제1비트를 옌코딩하는 단계, 상기 재생된 코드단어에 응답하여 상기 조건적 결정 바이트중 하나를 선택하는 단계 및, 디코드된 출력을 제공하기 위해 상기 선택된 바이트와 복구된 제1비트를 결합하는 단계를 더 구비하여 이루어진 것을 특징으로 하는 QAM을 이용하여 디지탈 데이터를 통신하기 위한 방법.
  6. 제5항에 있어서, 전송되는 상기 심볼을 제공하기 위해 에러 정정 엔코딩 알고리즘을 이용하여 정보비트를 엔코딩하는 단계와, 심볼 에러 정정 디코딩 알고리즘을 이용하여 상기 출력을 더욱 디코딩하는 단계를 더 구비하여 이루어진 것을 특징으로 하는 QAM을 이용하여 디지탈 데이터를 통신하기 위한 방법.
  7. 제5항에 있어서, 상기 디코딩을 위한 알고리즘이 비터비 알고리즘인 것을 특징으로 하는 QAM을 이용하여 디지탈 데이터를 통신하기 한 방법.
  8. 전송되는 심볼을 제1비트와 적어도 하나의 잔여 비트로 파싱하는 수단과, N-비트 QAM 콘스텔레이션 패턴의 N/4 심볼 포인트를 포함하는 4개의 서브세트중 하나로 정의되는 2-비트 코드단어를 제공하기 위해 1/2비율 2진화 콘볼루쇼널 엔코딩 알고리즘에 따라 상기 제1비트를 엔코딩하기 위한 수단, 변조함수를 제공하기 위해 상기 코드단어에 의해 정의된 서브세트에 포함되는 N/4 심볼포인트중 하나를 갖춘 상기 심볼과 관련되는 상기 잔여비트에 따라 상기 코드단어를 맵핑하기 위한 수단 및, 통신채널로 전송하기 위해 상기 변조함수에 따라 캐리어를 변조하기 위한 수단을 구비하여 구성된 것을 특징으로 하는 QAM을 이용하여 디지탈 데이터를 엔코딩하기 위한 장치.
  9. 제8항에 있어서, 상기 심볼을 제공하기 위해 에러 정정 엔코딩 알고리즘을 이용하여 정보비트를 엔코딩하기 위한 외부 엔코더를 더 구비하여 구성된 것을 특징으로 하는 QAM을 이용하여 디지탈 데이터를 엠코딩하기 위한 장치.
  10. 제8항에 있어서, 상기 코드단어는 상기 변조함수의 최하위 비트를 형성함과 더불어 상기 콘스텔레이션 패턴의 좌표의 매트릭스의 열을 정의하고, 상기 잔여 비트는 상기 변조함수의 최상위 비트를 형성함과 더불어 상기 콘스텔레이션 패턴의 크기를 결정하도록 된 것을 특징으로 하는 QAM을 이용하여 디지탈 데이터를 엔코딩하기 위한 장치.
  11. 제8항에 있어서, 상기 엔코딩 수단이 트렐리스 코드화 알고리즘을 이용하는 것을 특징으로 하는 QAM을 이용하여 디지탈 데이터를 엔코딩하기 위한 장치.
  12. 2-비트 코드단어가 다수의 QAM 콘스텔레이션 서브세트중 하나로 정의됨과 더불어 잔여(N-2)비트부가 상기 하나의 서브세트내의 신호 포인트를 나타내는 N-비트 QAM 변조함수를 복구하기 위해 수신된 캐리어를 복조하기 위한 수단과, 상기 서브세트에 대응하는 길이의 하나의 세트를 제공함과 더불어(N-2)비트부에 의해 정의된 신호포인트의 다수의 조건적 결정을 나타내는 다수의 (N-2)비트 서브그룹을 제공하기 위해 복구된 변조함수를 프루닝하기 위한 수단, 제1비트를 복구하기 위해 1/2비율 2진화 콘볼루쇼널 코드를 디코딩하기 위한 알고리즘에서의 상기 거리를 이용하기 위한 디코더수단, 상기 코드단어를 재생하기 위해 1/2비율 2진화 콘볼루쇼널 엔코딩 알고리즘을 이용하여 복구된 제1비트를 엔코딩하기 위한 수단, 상기 재생된 코드단어에 응답하여 상기 다수의 (N-2) 비트 서브그룹중 하나를 선택하기 위한 수단 및 디코드된 출력을 제공하기 위해 선택된 서브그룹과 복구된 제1비트를 결합하는 수단을 구비하여 구성된 것을 특징으로 하는 QAM심볼 데이터를 디코딩하기 위한 장치.
  13. 제12항에 있어서, 상기 코드단어가 상기 변조함수의 최하위 비트로 구성되면서 콘스텔레이션 좌표의 매트릭스의 열를 정의하고, 선택된 서브그룹이 최상위 비트로 구성되면서 상기 매트릭스의 행을 정의하도록 된 것을 특징으로 하는 QAM 심볼 데이터를 디코딩하기 위한 장치.
  14. 제12항에 있어서, 상기 프루닝수단이 콘스텔레이션 좌표의 매트릭스의 각 열에 대해 복구된 N-비트 변조 함수를 양자화하고, 상기 조건적 결정이 각 선택의 질을 정의하는 거리의 세트에 따른 상기 각 열에 대해 최선의 선택으로 이루어진 것을 특징으로 하는 QAM 심볼 데이터를 디코딩하기 위한 장치.
  15. 제12항에 있어서, 상기 디코딩수단이 콘볼루쇼널 코드를 디코딩하기 위한 소프트 결정 알고리즘을 사용하는 디코더로 구성된 것을 특징으로 하는 QAM 심볼 데이터를 디코딩하기 위한 장치.
  16. 제12항에 있어서, 심볼 에러 정정 알고리즘을 이용하여 상기 출력을 디코딩하기 위한 외부 디코더를 더 구비하고, 상기 외부 디코더수단과 외부 디코더의 조합이 연결 디코더를 형성하도록된 것을 특징으로 하는 QAM심볼 데이터를 디코딩하기 위한 장치.
  17. 제16항에 있어서, 상기 디코딩 알고리즘이 비터비 알고릭즘으로 이루어진 것을 특징으로 하는 연결 디코더.
  18. 제17항에 있어서, 상기 심볼 에러 정정 알고리즘이 리드-솔로몬 코드로 이루어진 것을 특징으로 하는 연결 디코더.
  19. 제16항에 있어서, 상기 캐리어가 HDTV 캐리어신호인 것을 특징으로 하는 연결 디코더.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019920013358A 1991-07-26 1992-07-25 트렐리스 코드화 큐에이엠(qam)을 이용하여 디지탈 데이터를 통신하기 위한 방법 및 그 장치 KR960016660B1 (ko)

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US07/736,738 US5233629A (en) 1991-07-26 1991-07-26 Method and apparatus for communicating digital data using trellis coded qam
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