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Bandwidth efficient coded modulation scheme based on MLC (multi-level code) signals having multiple maps

  • US 7,370,265 B2
  • Filed: 02/01/2007
  • Issued: 05/06/2008
  • Est. Priority Date: 05/31/2002
  • Status: Expired due to Fees
First Claim
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1. A MLC LDPC (Multi-Level Code Low Density Parity Check) encoder that is operable to generate an LDPC coded signal, the encoder comprising:

  • an MLC LDPC encoder that is operable to encode a plurality of bits thereby generating an MLC block that include a plurality of levels;

    a symbol mapper that is operable to;

    generate a first symbol that includes a first bit from a first level of the plurality of levels of the MLC block and a second bit from a second level of the plurality of levels of the MLC block;

    generate a second symbol that includes a third bit from the first level of the plurality of levels of the MLC block and a fourth bit from the second level of the plurality of levels of the MLC block;

    symbol map the first symbol to a first constellation having a corresponding first mapping; and

    symbol map the second symbol to a second constellation having a corresponding second mapping; and

    wherein;

    the LDPC coded signal includes the symbol mapped first symbol and the symbol mapped second symbol.

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