CA2091814A1 - Mode selective quadrature amplitude modulation communication system - Google Patents

Mode selective quadrature amplitude modulation communication system

Info

Publication number
CA2091814A1
CA2091814A1 CA2091814A CA2091814A CA2091814A1 CA 2091814 A1 CA2091814 A1 CA 2091814A1 CA 2091814 A CA2091814 A CA 2091814A CA 2091814 A CA2091814 A CA 2091814A CA 2091814 A1 CA2091814 A1 CA 2091814A1
Authority
CA
Canada
Prior art keywords
qam
synchronization
met
communication system
detected
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
CA2091814A
Other languages
French (fr)
Other versions
CA2091814C (en
Inventor
Woo H. Paik
Scott A. Lery
John M. Fox
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.)
Vizio Inc
Original Assignee
General Instrument Corp
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
Application filed by General Instrument Corp filed Critical General Instrument Corp
Publication of CA2091814A1 publication Critical patent/CA2091814A1/en
Application granted granted Critical
Publication of CA2091814C publication Critical patent/CA2091814C/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
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0059—Convolutional codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • 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
    • H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
    • H04N5/211—Ghost signal cancellation

Abstract

A quadrature amplitude modulation (QAM) communication system is provided in which data can be communicated in any one of a plurality of QAM
modes, such as 16-QAM, 32-QAM, and 64-QAM (30). A
receiver (70) detects the particular QAM mode transmitted on a trial and error basis, by attempting to decode the received data using different QAM modes until a synchronization condition is detected. The synchronization condition can require that a plurality of different synchronization tests be met. In a specific embodiment, a first synchronization test is met when a renormalization rate of a trellis decoder (90) is below a threshold value. A second synchronization test is met when a first synchronization word is detected in the received data. A third and final synchronization test is met when a second synchronization word is detected in the received data. In order to reduce the cost of the receiver, most of the QAM mode dependent components (76, 80, 84, 90, 98, 102) are implemented using look-up tables stored in PROMs.
CA002091814A 1992-03-24 1993-03-17 Mode selective quadrature amplitude modulation communication system Expired - Lifetime CA2091814C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/852,330 US5363408A (en) 1992-03-24 1992-03-24 Mode selective quadrature amplitude modulation communication system
US07/852,330 1992-03-24

Publications (2)

Publication Number Publication Date
CA2091814A1 true CA2091814A1 (en) 1993-09-25
CA2091814C CA2091814C (en) 2000-08-08

Family

ID=25313055

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002091814A Expired - Lifetime CA2091814C (en) 1992-03-24 1993-03-17 Mode selective quadrature amplitude modulation communication system

Country Status (10)

Country Link
US (1) US5363408A (en)
EP (1) EP0562422B1 (en)
JP (2) JP3511388B2 (en)
KR (1) KR0152450B1 (en)
AU (1) AU660136B2 (en)
CA (1) CA2091814C (en)
DE (1) DE69316415T2 (en)
ES (1) ES2113967T3 (en)
HK (1) HK1008454A1 (en)
NO (1) NO931053L (en)

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Also Published As

Publication number Publication date
KR930020882A (en) 1993-10-20
ES2113967T3 (en) 1998-05-16
DE69316415T2 (en) 1998-08-06
JPH06120994A (en) 1994-04-28
JP2003179659A (en) 2003-06-27
NO931053D0 (en) 1993-03-23
NO931053L (en) 1993-09-27
KR0152450B1 (en) 1998-11-02
HK1008454A1 (en) 1999-05-07
AU3401693A (en) 1993-09-30
JP3511388B2 (en) 2004-03-29
AU660136B2 (en) 1995-06-08
EP0562422B1 (en) 1998-01-21
EP0562422A1 (en) 1993-09-29
CA2091814C (en) 2000-08-08
US5363408A (en) 1994-11-08
DE69316415D1 (en) 1998-02-26
JP3431919B2 (en) 2003-07-28

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