On Fixed-Point Implementation of Log-MPA for SCMA Signals

Jiaqi Liu, Gang Wu, Shaoqian Li, Olav Tirkkonen

Research output: Contribution to journalArticleScientificpeer-review

24 Citations (Scopus)


In this letter, we present a design framework for fixed-point implementation of the log-domain message passing algorithm (Log-MPA) for sparse code multiple access signals, and make a detailed comparative analysis on the complexity of Log-MPA and traditional MPA. We also investigate the impact of the number of massage-passing iterations within the Log-MPA decoding process on the performance of Log-MPA. Simulation results demonstrate that Log-MPA achieves favorable performance with low-complexity hardware implementation as compared to MPA. We also implement Log-MPA on FPGA evaluation board to verify the performance of Log-MPA.

Original languageEnglish
Article number7453132
Pages (from-to)324-327
Number of pages4
Issue number3
Publication statusPublished - 1 Jun 2016
MoE publication typeA1 Journal article-refereed


  • Bipartite graph
  • iterative decoding
  • log-Likehood ratio
  • massage passing
  • Sparse code multiple access

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