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

Risa SHIOI, Takashi IMAMURA, Yukitoshi SANADA

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Summary :

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.

Publication
IEICE TRANSACTIONS on Communications Vol.E105-B No.3 pp.309-317
Publication Date
2022/03/01
Publicized
2021/10/15
Online ISSN
1745-1345
DOI
10.1587/transcom.2021EBP3046
Type of Manuscript
PAPER
Category
Wireless Communication Technologies

Authors

Risa SHIOI
  Keio University
Takashi IMAMURA
  Keio University
Yukitoshi SANADA
  Keio University

Keyword