Improved decoding of LDPC coded modulations

Yaniv Nana*, Eran Sharon, Simon Litsyn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


A Coded Modulation Belief Propagation (CMBP) decoder is proposed for decoding LDPC codes with multilevel modulations. The decoder takes into account statistical dependencies among bits originating in the same symbol, providing better performance than the Marginal BP (MBP) decoder. Asymptotically it converges to MAP decoding. The CMBP decoder is based on a Single-Level Coding (SLC) scheme and does not suffer from practical disadvantages of Multi-Level Coding (MLC) schemes. Furthermore, the CMBP decoder can close the capacity gap of the Bit Interleaved Coded Modulation (BICM) SLC scheme. The BICM capacity gap increases when the modulation size increases and in scenarios where Gray mapping is not possible.

Original languageEnglish
Pages (from-to)375-377
Number of pages3
JournalIEEE Communications Letters
Issue number5
StatePublished - May 2006


  • Bit interleaved coded modulation
  • Iterative decoding
  • LDPC codes


Dive into the research topics of 'Improved decoding of LDPC coded modulations'. Together they form a unique fingerprint.

Cite this