MX9600925A - Modulacion codificada con ganancia de conformacion. - Google Patents

Modulacion codificada con ganancia de conformacion.

Info

Publication number
MX9600925A
MX9600925A MX9600925A MX9600925A MX9600925A MX 9600925 A MX9600925 A MX 9600925A MX 9600925 A MX9600925 A MX 9600925A MX 9600925 A MX9600925 A MX 9600925A MX 9600925 A MX9600925 A MX 9600925A
Authority
MX
Mexico
Prior art keywords
coded modulation
shaping gain
modulation schemes
various
dimensional
Prior art date
Application number
MX9600925A
Other languages
English (en)
Other versions
MXPA96000925A (es
Inventor
Lee-Fang Wei
Original Assignee
At & T 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 At & T Corp filed Critical At & T Corp
Publication of MX9600925A publication Critical patent/MX9600925A/es
Publication of MXPA96000925A publication Critical patent/MXPA96000925A/es

Links

Classifications

    • 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
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/497—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems by correlative coding, e.g. partial response coding or echo modulation coding transmitters and receivers for partial response systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/497—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems by correlative coding, e.g. partial response coding or echo modulation coding transmitters and receivers for partial response systems
    • H04L25/4975—Correlative coding using Tomlinson precoding, Harashima precoding, Trellis precoding or GPRS
    • 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
    • H04L27/3411—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set
    • 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 MPEG packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation

Abstract

Un sistema de transmision HDTV incluye un precodificador Tomlinson (17) en el transmisor para compensar la interferencia intersímbolos forzada, introducida por un filtro de bloque NTSC utilizado en el receptor. El sistema emplea un esquema de una familia de esquemas de modulacion codificada, de cuatro dimensiones en base a una constelacion base de una dimension, de seis puntos de señal. Los diversos esquemas presentan diferentes cantidades de la llamada ganancia de conformacion y soportan diferentes velocidades de datos de carga respectivas. Las características del precodificador Tomlinson son tales que conservan la porcion sustancial de la ganancia de conformacion. El sistema puede conmutar su operacion entre los diversos sistemas de modulacion codificada que se toma en cuenta para los cambios en las condiciones del cual y/o para adaptar diferentes velocidades de bit de señal fuente.
MXPA/A/1996/000925A 1994-07-15 1996-03-11 Modulacion codificada con ganancia de conformacion MXPA96000925A (es)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08276079 1994-07-15
US08/276,079 US5559561A (en) 1994-07-15 1994-07-15 Coded modulation with shaping gain and tomlinson precoding
PCT/US1995/008923 WO1996003004A1 (en) 1994-07-15 1995-07-14 Coded modulation with shaping gain

Publications (2)

Publication Number Publication Date
MX9600925A true MX9600925A (es) 1997-07-31
MXPA96000925A MXPA96000925A (es) 1997-12-01

Family

ID=

Also Published As

Publication number Publication date
CA2170239C (en) 2000-04-18
US5559561A (en) 1996-09-24
TW277198B (es) 1996-06-01
JPH09503367A (ja) 1997-03-31
KR960705449A (ko) 1996-10-09
WO1996003004A1 (en) 1996-02-01
CA2170239A1 (en) 1996-02-01

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