An iterative MIMO receiver employing virtual channels with a turbo decoder for OFDM wireless systems

Akihito Taya, Satoshi Denno, Koji Yamamoto, Masahiro Morikura, Daisuke Umehara, Hidekazu Murata, Susumu Yoshida

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

This paper proposes a novel iterative multiple-input multiple-output (MIMO) receiver for orthogonal frequency division multiplexing (OFDM) systems, named as an "iterative MIMO receiver employing virtual channels with a Turbo decoder." The proposed MIMO receiver comprises a MIMO detector with virtual channel detection and a Turbo decoder, between which signals are exchanged iteratively. This paper proposes a semi hard input soft output (SHISO) iterative decoding for the iterative MIMO receiver that achieves better performance than a soft input soft output (SISO) iterative decoding. Moreover, this paper proposes a new criterion for the MIMO detector to select the most likely virtual channel. The performance of the proposed receiver is verified in a 6 × 2 MIMO-OFDM system by computer simulation. The proposed receiver achieves better performance than the SISO MAP iterative receiver by 1.5 dB at the bit error rate (BER) of 10-4, by optimizing the number of the Turbo iteration per the SHISO iteration. Moreover, the proposed detection criterion enables the proposed receiver to achieve a gain of 3.0dB at the BER of 10-5, compared with the SISO MAP iterative receiver with the Turbo decoder.

Original languageEnglish
Pages (from-to)878-889
Number of pages12
JournalIEICE Transactions on Communications
VolumeE98B
Issue number5
DOIs
Publication statusPublished - May 1 2015

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Keywords

  • Iterative scheme
  • Log likelihood ratio
  • Multiple-input multiple-output
  • Soft-input soft-output
  • Virtual channel

ASJC Scopus subject areas

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

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