REPETITIVE-PN1023-SEQUENCE ECHO-CANCELLATION REFERENCE SIGNAL FOR SINGLE-CARRIER DIGITAL TELEVISION BROADCAST SYSTEMS

摘要

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