CA2181539A1 - Trellis Coded Modulation System for HDTV - Google Patents

Trellis Coded Modulation System for HDTV

Info

Publication number
CA2181539A1
CA2181539A1 CA2181539A CA2181539A CA2181539A1 CA 2181539 A1 CA2181539 A1 CA 2181539A1 CA 2181539 A CA2181539 A CA 2181539A CA 2181539 A CA2181539 A CA 2181539A CA 2181539 A1 CA2181539 A1 CA 2181539A1
Authority
CA
Canada
Prior art keywords
symbols
group
viterbi decoder
data bits
data
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA2181539A
Other languages
French (fr)
Other versions
CA2181539C (en
Inventor
Richard W. Citta
David A. Willming
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zenith Electronics LLC
Original Assignee
Individual
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.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=23038750&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2181539(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of CA2181539A1 publication Critical patent/CA2181539A1/en
Application granted granted Critical
Publication of CA2181539C publication Critical patent/CA2181539C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0054—Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
    • 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
    • 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
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof

Abstract

A trellis coded modulation system comprises a source of successive 2-bit data symbols X1, X2 arranged in a frame format wherein each frame comprises a plurality of data segments each including a plurality of groups of interleaved data symbols. Each group of interleaved data symbols is separately coded by a precoder and convolution encoder to derive coded output symbols Z0, Z1, Z, which are mapped to respective 8-level symbols for transmission together with periodically generated frame and segment sync symbols. The received signal may be filtered by a linear filter, e.g. a comb filter to reduce co-channel interference and each group of filtered symbols is applied to a respective first Viterbi decoder for estimating data bits X1, X2. Each first decoder preferably comprises a reduced complexity Viterbi decoder responsive to a partial representation of the state of the linear filter. Each group of received symbols may also be directly applied to a respective second Viterbi decoder for estimating data bits X1 X2. Estimated data bits X1 X2 from the first or second decoders are selected for further processing.
CA002181539A 1994-07-08 1995-06-29 Trellis coded modulation system for hdtv Expired - Lifetime CA2181539C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/272,181 1994-07-08
US08/272,181 US5583889A (en) 1994-07-08 1994-07-08 Trellis coded modulation system for HDTV
PCT/US1995/008174 WO1996002100A1 (en) 1994-07-08 1995-06-29 Trellis coded modulation system for hdtv

Publications (2)

Publication Number Publication Date
CA2181539A1 true CA2181539A1 (en) 1996-01-25
CA2181539C CA2181539C (en) 2000-05-30

Family

ID=23038750

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002181539A Expired - Lifetime CA2181539C (en) 1994-07-08 1995-06-29 Trellis coded modulation system for hdtv

Country Status (7)

Country Link
US (3) US5583889A (en)
JP (1) JP3354938B2 (en)
KR (1) KR100234865B1 (en)
CN (1) CN1088301C (en)
BR (1) BR9507201A (en)
CA (1) CA2181539C (en)
WO (1) WO1996002100A1 (en)

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