CA2562662A1 - Physical layer header scrambling in satellite broadcast systems - Google Patents

Physical layer header scrambling in satellite broadcast systems Download PDF

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Publication number
CA2562662A1
CA2562662A1 CA002562662A CA2562662A CA2562662A1 CA 2562662 A1 CA2562662 A1 CA 2562662A1 CA 002562662 A CA002562662 A CA 002562662A CA 2562662 A CA2562662 A CA 2562662A CA 2562662 A1 CA2562662 A1 CA 2562662A1
Authority
CA
Canada
Prior art keywords
signal
scrambling code
scrambling
header
communication system
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
CA002562662A
Other languages
French (fr)
Other versions
CA2562662C (en
Inventor
Lin-Nan Lee
Feng-Wen Sun
Adam Von Ancken
Joseph Santoru
Ernest C. Chen
Shamik Maitra
Dennis Lai
Guangcai Zhou
Tung-Sheng Lin
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.)
DirecTV Group Inc
Original Assignee
The Directv Group, Inc.
Lin-Nan Lee
Feng-Wen Sun
Adam Von Ancken
Joseph Santoru
Ernest C. Chen
Shamik Maitra
Dennis Lai
Guangcai Zhou
Tung-Sheng Lin
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 The Directv Group, Inc., Lin-Nan Lee, Feng-Wen Sun, Adam Von Ancken, Joseph Santoru, Ernest C. Chen, Shamik Maitra, Dennis Lai, Guangcai Zhou, Tung-Sheng Lin filed Critical The Directv Group, Inc.
Publication of CA2562662A1 publication Critical patent/CA2562662A1/en
Application granted granted Critical
Publication of CA2562662C publication Critical patent/CA2562662C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
    • H04B7/1858—Arrangements for data transmission on the physical system, i.e. for data bit transmission between network components
    • 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
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption
    • 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
    • H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
    • 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
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream decryption
    • 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]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
    • H04N7/163—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing by receiver means only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications
    • H04N7/17318—Direct or substantially direct transmission and handling of requests
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system

Abstract

Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises scrambling a first header of the first signal using a first scrambling code, scrambling a second header of the second signal using a second scrambling code, and transmitting the first signal and the second signal with the scrambled first header and the scrambled second header over different channels of the communication system.

Claims (20)

1. A method for minimizing co-channel interference in a communication system having at least a first signal and a second signal, each signal transmitted on different channels within the communication system, comprising:
scrambling a first header of the first signal using a first scrambling code;
scrambling a second header of the second signal using a second scrambling code; and transmitting the first signal and the second signal with the scrambled first header and the scrambled second header over different channels of the communication system.
2. The method of claim 1, wherein the first signal further comprises a first pilot block, and the pilot block is also scrambled using the first scrambling code.
3. The method of claim 2, wherein the first signal further comprises a first payload portion and the second signal further comprises a second payload portion, and the first payload portion is scrambled using a third scrambling code and the second payload portion is scrambled using a fourth scrambling code.
4. The method of claim 3, wherein the third scrambling code and the fourth scrambling code are Gold codes.
5. The method of claim 4, wherein the first scrambling code and the third scrambling code are a mated pair.
6. The method of claim 5, wherein the first scrambling code and the second scrambling code are selected from a limited number of codes.
7. The method of claim 6, wherein a number of the limited number of codes is determined based on a number of interfering channels within the communication system.
8. The method of claim 1, further comprising the step of:
transmitting information associated with the first scrambling code and the second scrambling code to a receiver within the communication system.
9. An apparatus for minimizing co-channel interference in a communication system having at least a first signal and a second signal, each signal transmitted on different channels within the communication system, comprising:
a scrambler for scrambling at least a portion of a first header of the first signal using a first scrambling code and for scrambling at least a portion of a second header of the second signal using a second scrambling code; and a transmitter for transmitting the first signal and the second signal over different channels of the communication system.
10. The apparatus of claim 8, wherein the first signal further comprises a first pilot block, and the pilot block is also scrambled using the first scrambling code.
11. The apparatus of claim 10, wherein the first signal further comprises a first payload portion and the second signal further comprises a second payload portion, and the first payload portion is scrambled using a third scrambling code and the second payload portion is scrambled using a fourth scrambling code.
12. The apparatus of claim 11, wherein the third scrambling code and the fourth scrambling code are Gold codes.
13. The apparatus of claim 12, wherein the first scrambling code and the third scrambling code are a mated pair.
14. The apparatus of claim 13, wherein the first scrambling code and the second scrambling code are selected from a limited number of codes.
15. The apparatus of claim 14, wherein a number of the limited number of codes is determined based on a number of interfering channels within the communication system.
16. The apparatus of claim 8, wherein the transmitter sends information associated with the first scrambling code and the second scrambling code to a receiver within the communication system.
17. A method for minimizing co-channel interference in a satellite-based communication system having at least a first signal and a second signal, each signal comprising at least a header and a payload, each signal being transmitted on different channels within the communication system, comprising:
scrambling a first header of the first signal using a first scrambling code;
scrambling a first payload of the first signal using a first Gold code;
scrambling a second header of the second signal using a second scrambling code;
scrambling a second payload of the second signal using a second Gold code; and transmitting the first signal and the second signal with the scrambled first header and the scrambled second header over different channels of the communication system.
18. The method of claim 17, wherein the first scrambling code and the second scrambling code are selected to minimize co-channel interference between the first signal and the second signal.
19. The method of claim 18, wherein the first scrambling code and the first Gold code are used as a mated pair of codes.
20. The method of claim 19, wherein each signal further comprises at least one pilot block, the pilot blocks scrambled with their respective header.
CA2562662A 2004-04-12 2005-04-11 Physical layer header scrambling in satellite broadcast systems Active CA2562662C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US56141804P 2004-04-12 2004-04-12
US60/561,418 2004-04-12
PCT/US2005/012278 WO2005101844A2 (en) 2004-04-12 2005-04-11 Physical layer header scrambling in satellite broadcast systems

Publications (2)

Publication Number Publication Date
CA2562662A1 true CA2562662A1 (en) 2005-10-27
CA2562662C CA2562662C (en) 2011-11-29

Family

ID=35150661

Family Applications (3)

Application Number Title Priority Date Filing Date
CA2562662A Active CA2562662C (en) 2004-04-12 2005-04-11 Physical layer header scrambling in satellite broadcast systems
CA2562664A Expired - Fee Related CA2562664C (en) 2004-04-12 2005-04-11 Shifted channel characteristics for mitigating co-channel interference
CA2562549A Expired - Fee Related CA2562549C (en) 2004-04-12 2005-04-11 Methods and apparatuses for minimizing co-channel interference

Family Applications After (2)

Application Number Title Priority Date Filing Date
CA2562664A Expired - Fee Related CA2562664C (en) 2004-04-12 2005-04-11 Shifted channel characteristics for mitigating co-channel interference
CA2562549A Expired - Fee Related CA2562549C (en) 2004-04-12 2005-04-11 Methods and apparatuses for minimizing co-channel interference

Country Status (8)

Country Link
US (5) US7551736B2 (en)
EP (3) EP1738586B1 (en)
JP (6) JP2007533263A (en)
KR (3) KR100829342B1 (en)
CN (4) CN101019108B (en)
CA (3) CA2562662C (en)
HK (1) HK1106596A1 (en)
WO (3) WO2005101844A2 (en)

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