Open-loop correlation reduction precoding in overloaded MIMO-OFDM systems

Hikari Matsuoka, Yoshihito Doi, Tatsuro Yabe, Yukitoshi Sanada

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


This paper proposes an open-loop correlation reduction precoding scheme for overloaded multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. In overloaded MIMO-OFDM systems, frequency diversity through joint maximum likelihood (ML) decoding suppresses performance degradation owing to spatial signal multiplexing. However, on a line-of-sight (LOS) channel, a channel matrix may have a large correlation between coded symbols transmitted on separate subcarriers. The correlation reduces the frequency diversity gain and deteriorates the signal separation capability. Thus, in the proposed scheme, open-loop precoding is employed at the transmitter of an overloaded MIMO system in order to reduce the correlation between codewords transmitted on different signal streams. The proposed precoding scheme changes the amplitude as well as the phase of the coded symbols transmitted on different subcarriers. Numerical results obtained through computer simulation show that the proposed scheme improves the bit error rate performance on Rician channels. It is also shown that the proposed scheme greatly suppresses the performance degradation on an independent Rayleigh fading channel even though the amplitude of the coded symbols varies.

Original languageEnglish
Pages (from-to)202-210
Number of pages9
JournalIEICE Transactions on Communications
Issue number1
Publication statusPublished - 2016 Jan


  • Open-loop precoding
  • Overloaded MIMO
  • Rician fading channel

ASJC Scopus subject areas

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


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