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Repetitive-PN1023-sequence echo-cancellation reference signal for single-carrier digital television broadcast systems

A technology of digital TV signals and sequences, which is used in the components of TV systems, digital transmission systems, high-definition TV systems, etc.

Inactive Publication Date: 2007-04-04
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As n increases beyond about 8, more DSS sequences must be contained by repeating PN sequences, but the problem is not as difficult as it first appears

Method used

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  • Repetitive-PN1023-sequence echo-cancellation reference signal for single-carrier digital television broadcast systems
  • Repetitive-PN1023-sequence echo-cancellation reference signal for single-carrier digital television broadcast systems
  • Repetitive-PN1023-sequence echo-cancellation reference signal for single-carrier digital television broadcast systems

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Experimental program
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Embodiment Construction

[0034] Figures 1A and 1B together provide a row-by-row, left-to-right listing of consecutive symbols in a 2507-symbol repeating PN1023 sequence used in implementing various aspects of the invention. Repeating the 1 of the PN1023 sequence at 2507 symbols corresponds to the +5 carrier modulation value in the digital television signal, and the repeating the 0 of the PN1023 sequence at the 2507 symbol corresponds to the -5 carrier modulation value in the digital television signal. The repeating PN1023 sequence is used to modulate the vestigial sideband carrier during the terminating data segments 314, 315 and 316 of each data field and during the first 11 symbols in the initial data segment of the next data field. The repeating PN1023 sequence begins with the 1001 sequence modulating the vestigial sideband carrier that is the data segment synchronization (DSS) signal, and has other sequences 832, 1664, and 2496 symbol epochs following. In addition to these DSS signals, the modulat...

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Abstract

DTV signals transmitted over the air with a symbol rate of around 10.76 million samples per second include echo-cancellation reference (ECR) signals each of which includes or essentially consists of a repetitive-PN1023 sequence with baud-rate symbols, which repetitive-PN1023 sequence incorporates a number of consecutive data-segment synchronization signals. Receivers for these DTV signals respond to these ECR signals to generate initial weighting coefficients for adaptive filters used for channel equalization and echo suppression. The initial weighting coefficients are calculated from a cepstrum extracted from the repetitive-PN1023 sequence ECR signal by DFT methods or with a PN1023 auto-correlation match filter.

Description

technical field [0001] The present invention relates to digital television (DTV) signals for over-the-air broadcast, transmitters for such broadcast DTV signals, and receivers for such broadcast DTV signals, which include a new echo cancellation reference ( ECR) signal component used to initialize parameters of adaptive filters used in DTV receivers for channel equalization and echo cancellation. Background technique [0002] The Advanced Television Systems Committee (ATSC) published a digital television standard as document A / 53 in 1995, hereinafter simply referred to as "A / 53" for brevity. Appendix D of A / 53 entitled "RF / Transmission System Characteristics" is expressly incorporated by reference into this specification. Appendix D specifies that a data frame shall include two data fields, each data field includes 313 data segments, and each data segment includes 832 symbols. Appendix D specifies that each data segment shall begin with a 4-symbol Data Segment Synchronizat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/015H04B3/06H04B7/005H04L1/00H04L7/00H04L25/03H04N5/21H04N5/44H04N5/455H04N7/24
CPCH04N21/2383H04L2025/03375H04L1/0059H04L1/0071H04N5/4401H04L2025/03789H04L1/0065H04L25/03006H04N21/4382H04L1/0083H04L25/03987H04L1/0057H04L2025/03605H04N5/211H04N21/426H04N7/015
Inventor 艾伦·L·R·林伯格詹姆斯·D·麦克唐纳钱德拉坎特·B·帕特尔
Owner SAMSUNG ELECTRONICS CO LTD