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1. WO1996003004 - CODED MODULATION WITH SHAPING GAIN

Publication Number WO/1996/003004
Publication Date 01.02.1996
International Application No. PCT/US1995/008923
International Filing Date 14.07.1995
IPC
H04N 5/40 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
38Transmitter circuitry
40Modulation circuits
H04L 25/03 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
H04L 25/497 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
38Synchronous or start-stop systems, e.g. for Baudot code
40Transmitting circuits; Receiving circuits
49using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels
497by correlative coding, e.g. partial response coding or echo modulation coding
H04L 27/34 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
32Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18, or H04L27/26213
34Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
H04N 21/2383 2011.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
21Selective content distribution, e.g. interactive television or video on demand
20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
23Processing of content or additional data; Elementary server operations; Server middleware
238Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
2383Channel coding of digital bit-stream, e.g. modulation
H04N 21/438 2011.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
21Selective content distribution, e.g. interactive television or video on demand
40Client devices specifically adapted for the reception of, or interaction with, content, e.g. STB ; Operations thereof
43Processing 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 synchronizing decoder's clock; Client middleware
438Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
CPC
H04L 25/03343
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
03006Arrangements for removing intersymbol interference
03343Arrangements at the transmitter end
H04L 25/497
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
38Synchronous or start-stop systems, e.g. for Baudot code
40Transmitting circuits; Receiving circuits
49using 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
497by correlative coding, e.g. partial response coding or echo modulation coding ; transmitters and receivers for partial response systems
H04L 25/4975
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
38Synchronous or start-stop systems, e.g. for Baudot code
40Transmitting circuits; Receiving circuits
49using 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
497by correlative coding, e.g. partial response coding or echo modulation coding ; transmitters and receivers for partial response systems
4975Correlative coding using Tomlinson precoding, Harashima precoding, Trellis precoding or GPRS
H04L 27/3411
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
32Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
34Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
3405Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
3411reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set
H04N 21/2383
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
21Selective content distribution, e.g. interactive television or video on demand [VOD]
20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
23Processing of content or additional data; Elementary server operations; Server middleware
238Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
2383Channel coding ; or modulation; of digital bit-stream, e.g. QPSK modulation
H04N 21/4382
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
21Selective content distribution, e.g. interactive television or video on demand [VOD]
40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
438Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
4382Demodulation or channel decoding, e.g. QPSK demodulation
Applicants
  • AT & T CORP. [US/US]; 32 Avenue of the Americas New York, NY 10013-2412, US
Inventors
  • WEI, Lee-Fang; US
Agents
  • SLUSKY, Ronald, D.; c/o Wilde, P.,V.,D. P.O. Box 679 Holmdel, NJ 07733, US
Priority Data
08/276,07915.07.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CODED MODULATION WITH SHAPING GAIN
(FR) MODULATION CODEE AVEC GAIN DE MISE EN FORME
Abstract
(EN)
An HDTV transmission system includes a Tomlinson precoder (17) in the transmitter in order to compensate for the forced intersymbol interference introduced by an NTSC rejection filter used in the receiver. The system employs one of a family of four-dimensional coded modulation schemes based on a six-signal-point, one dimensional base constellation. The various schemes exhibit different amounts of so-called shaping gain and support respective different payload data rates. The characteristics of the Tomlinson precoder are such as to preserve a substantial portion of the shaping gain. The system may switch its operation among the various coded modulation schemes to account for changes in channel conditions and/or to accommodate different source signal bit rates.
(FR)
Système de transmission TVHD qui comporte un précodeur Tomlinson (17) dans l'émetteur afin de compenser le brouillage forcé entre symboles introduit par un filtre de suppression NTSC utilisé dans le récepteur. Ledit système emploie l'un des schémas d'une famille de schémas de modulation à quatre dimensions basés sur une constellation de base à six points de signaux et à une dimension. Les différents schémas présentent différentes quantités de gain dit de mise en forme et soutiennent différents débits de données de charge utile. Les caractéristiques du précodeur Tomlinson sont telles qu'elles préservent une partie importante du gain de mise en forme. Ledit système peut commuter son fonctionnement parmi les différents schémas de modulation codée pour répondre à des changements des conditions de canal et/ou pour répondre à différents débits binaires de signaux de source.
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