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Enhanced VSB Viterbi decoder

  • US 7,933,365 B2
  • Filed: 11/14/2005
  • Issued: 04/26/2011
  • Est. Priority Date: 11/16/2004
  • Status: Active Grant
First Claim
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1. A digital broadcast receiver, comprising:

  • a tuner for tuning a radio frequency (RF) signal comprising enhanced data and main data and converting the RF signal into an intermediate frequency (IF) signal;

    a demodulator for demodulating the IF signal to a baseband signal;

    an equalizer for compensating channel distortion of the baseband signal and outputting equalized enhanced symbols;

    an information recovery unit for recovering encoding-related information from the equalized enhanced symbols; and

    a decoder for decoding the equalized enhanced symbols based on the encoding-related information,wherein the enhanced data and the main data are generated in a digital broadcast transmitter by;

    randomizing original enhanced data,first Reed Solomon (RS) encoding the randomized original enhanced data for forward error correction (FEC),convolutional encoding the first RS-encoded original enhanced data,second RS encoding the convolutional encoded original enhanced data and original main data,interleaving the second RS-encoded original enhanced and main data,trellis-encoding the interleaved original enhanced and main data in a trellis encoding unit that includes an encoder and a pre-coder, andmultiplexing the trellis-encoded original enhanced and main data with a segment synchronization signal and a field synchronization signal,wherein trellis-encoding the interleaved original enhanced and main data comprises;

    encoding a first single bit among symbols corresponding to the interleaved original enhanced and main data at a coding rate of ½

    in the encoder, andpre-coding a second single bit among the symbols in the pre-coder.

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