Two-Stage Belief Propagation Detection with MMSE Pre-Cancellation for Overloaded MIMO

Risa Shioi, Takashi Imamura, Yukitoshi Sanada

Research output: Contribution to journalArticlepeer-review


In this paper, two-stage BP detection is proposed for overloaded MIMO. The proposal combines BP with the MMSE pre-cancellation algorithm followed by normal BP detection. In overloaded MIMO systems, the loops in a factor graph degrade the demodulation performance of BP detection. MMSE pre-cancellation reduces the number of connections or coefficient values in the factor graph which improves the convergence characteristics of posteriori probabilities. Numerical results obtained through computer simulation show that the BERs of the proposed two-stage BP detection outperforms the conventional BP with MMSE pre-cancellation in a low bit energy range when the MMSE block size is four and the number of MMSE blocks is one. When the pre-cancellation is applied for complexity reduction, the proposed scheme reduces multiplication operations and summation operations by the same factor of 0.7 though the amount of the performance improvement to the conventional scheme is limited.

Original languageEnglish
Pages (from-to)309-317
Number of pages9
JournalIEICE Transactions on Communications
Issue number3
Publication statusPublished - 2022 Mar


  • BP MIMO detection
  • MMSE pre-cancellation
  • overloaded MIMO detection

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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