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APPARATUS FOR ADAPTABLE/VARIABLE TYPE MODULATION AND DEMODULATION IN DIGITAL TX/RX SYSTEM

  • US 20110167317A1
  • Filed: 06/16/2009
  • Published: 07/07/2011
  • Est. Priority Date: 06/16/2008
  • Status: Abandoned Application
First Claim
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1. A physical layer transmission apparatus for adaptable/variable type modulation, the apparatus comprising:

  • a classification unit to classify a bit stream into a bit stream to be low density parity check (LDPC)-coded and a bit stream not to be LDPC-coded according to a predetermined scheme, when receiving the bit stream;

    an uncoded bit group unit to group the bit stream not to be LDPC-coded by a predetermined number of bits to output the uncoded bit groups;

    an LDPC encoder to perform LDPC-coding of the bit stream to be LDPC-coded to output the coded bit stream;

    a coded bit group unit to group the coded bit stream by the predetermined number of bits to output the coded bit groups;

    a quadrature amplitude modulation (QAM) unit to select a symbol coset by using the coded bit group and to determine a symbol from the selected symbol coset by using the uncoded bit group; and

    a convolutional interleaver to perform convolutional interleaving of the symbol determined by the quadrature amplitude modulation unit.

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