Reliability oriented decoding strategy for LDPC codes based D-JSCC system

Yibo Lyu, Shaohua Hong, Lin Wang, Zixiang Xiong

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1 Citation (Scopus)

Abstract

In this letter, a reliability oriented decoding strategy (RODS) for LDPC codes based distributed joint source and channel coding (D-JSCC) system is proposed. During each local decoding iteration, the reliability of each variable node is evaluated based on the sign of received log-likelihood ratios (LLRs) and its oscillation situation. Then, by employing reliability oriented updating operation, the negative influence of those inaccurate messages are suppressed. Moreover, extra operations are performed on a group of most unreliable source nodes so that more accurate posteriori LLRs can be obtained. During global iteration, offset operation are performed to reduce error propagation. The simulation results illustrate that the proposed RODS outperforms other decoding algorithms at the aspects of error correction performance and convergence speed, especially when the correlation between distributed sources is low.

Original languageEnglish
Pages (from-to)2364-2367
Number of pages4
JournalIEEE Communications Letters
Volume21
Issue number11
DOIs
Publication statusPublished - Nov 2017

Keywords

  • Algorithm design and analysis
  • AWGN channel
  • belief propagation (BP)
  • Correlation
  • Decoding
  • decoding strategy
  • distributed joint source and channel coding (D-JSCC)
  • Heuristic algorithms
  • Iterative decoding
  • low density parity check (LDPC) codes
  • Reliability

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