• DocumentCode
    1201181
  • Title

    Bit-reliability mapping in LDPC-coded modulation systems

  • Author

    Li, Yan ; Ryan, William E.

  • Author_Institution
    Dept. of Electr. & Comput. Eng., Arizona Univ., Tucson, AZ, USA
  • Volume
    9
  • Issue
    1
  • fYear
    2005
  • Firstpage
    1
  • Lastpage
    3
  • Abstract
    In this paper, we propose a reliability-based mapping strategy in LDPC-coded modulation systems. Compared to conventional mapping methods, this strategy gives a 0.15 dB - 0.2 dB performance improvement with no added complexity. Extrinsic information transfer (EXIT) chart analyses are used to explain the reason for this improvement. LDPC-coded modulation systems with gray and natural labeling are studied. We show that the performances of gray-labeled systems are always superior.
  • Keywords
    Gray codes; iterative decoding; modulation coding; parity check codes; phase shift keying; quadrature amplitude modulation; EXIT; LDPC-coded modulation systems; PSK; QAM; bit-reliability mapping; extrinsic information transfer chart; gray-labeled systems; iterative decoding; AWGN; Communication system signaling; Demodulation; Information analysis; Iterative decoding; Labeling; MIMO; Modulation coding; Parity check codes; Signal mapping;
  • fLanguage
    English
  • Journal_Title
    Communications Letters, IEEE
  • Publisher
    ieee
  • ISSN
    1089-7798
  • Type

    jour

  • DOI
    10.1109/LCOMM.200501010
  • Filename
    1375222