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1. WO2005022758 - SIMPLIFIED SCRAMBLING SCHEME FOR SATELLITE BROADCASTING SYSTEMS

Publication Number WO/2005/022758
Publication Date 10.03.2005
International Application No. PCT/US2004/027981
International Filing Date 27.08.2004
IPC
H04L 27/36 2006.1
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
36Modulator circuits; Transmitter circuits
CPC
H04B 7/18523
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
14Relay systems
15Active relay systems
185Space-based or airborne stations; ; Stations for satellite systems
18523Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service
H04L 25/03866
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
03828Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
03866using scrambling
H04L 27/34
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
H04L 27/36
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
36Modulator circuits; Transmitter circuits
H04N 21/235
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
235Processing of additional data, e.g. scrambling of additional data or processing content descriptors
H04N 21/23895
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
2389Multiplex stream processing, e.g. multiplex stream encrypting
23895involving multiplex stream encryption
Applicants
  • THE DIRECTV GROUP, INC. [US]/[US] (AllExceptUS)
  • CHEN, Ernest, C. [US]/[US] (UsOnly)
  • LAI, Dennis [US]/[US] (UsOnly)
  • LIN, Tung-Sheng [--]/[US] (UsOnly)
  • LINDSEY, William, C. [US]/[US] (UsOnly)
  • MAITRA, Shamik [US]/[US] (UsOnly)
  • SANTORU, Joseph [US]/[US] (UsOnly)
  • ZHOU, Guangcai [CN]/[US] (UsOnly)
Inventors
  • CHEN, Ernest, C.
  • LAI, Dennis
  • LIN, Tung-Sheng
  • LINDSEY, William, C.
  • MAITRA, Shamik
  • SANTORU, Joseph
  • ZHOU, Guangcai
Agents
  • CROOK, John, A.
Priority Data
60/498,82429.08.2003US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) SIMPLIFIED SCRAMBLING SCHEME FOR SATELLITE BROADCASTING SYSTEMS
(FR) SCENARIO D'EMBROUILLAGE SIMPLIFIE POUR SYSTEMES DE RADIODIFFUSION PAR SATELLITE
Abstract
(EN) A simplified scrambling scheme that unifies all signals of a satellite broadcasting system, including frame header (404), frame body (402) and pilot symbols (408) with a common reference phase. This results in the simplification and increased flexibility of the receiver front-end design without affecting the overall system performance. In many current communications systems with frame headers and pilot symbols, the phases of frame headers and pilot syrnbols are not designed to be aligned with any constellation points of the modulated data from the frame body. This scrambling scheme takes into account possible impact due to irregular phase changes between frame headers/pilot symbols and modulated data.
(FR) L'invention concerne un scénario d'embrouillage simplifié qui unifie tous les signaux de système de radiodiffusion par satellite,comprenant un en-tête de trame, un corps de trame et des symboles pilotes avec une phase de référence commune. On simplifie et on assouplit ainsi la conception de tête de réception sans affecter la performance globale d'un système. Dans de nombreux systèmes de communications existants qui comportent des en-têtes de trame et des symboles pilotes, les phases des en-têtes de trame et des symboles pilotes ne sont pas conçues pour être alignées avec des points de constellation quelconques dans les données modulées depuis le corps de trame. Ce scénario d'embrouillage tient compte des conséquences éventuelles de changements de phase irréguliers entre les en-têtes de trame/symboles pilotes et les données modulées.
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