Repetitive-PN1023-sequence echo-cancellation reference signal for single-carrier digital television broadcast systems
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United States of America Patent
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-
Jul 27, 2004
Grant Date -
May 2, 2002
app pub date -
Jul 11, 2001
filing date -
Jul 11, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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