Pseudo distance for trellis coded modulation in overloaded MIMO OFDM with sphere decoding

Ilmiawan Shubhi, Yukitoshi Sanada

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Efficient detection schemes for an overloaded multipleinput multiple-output (MIMO) system have been investigated recently. The literature shows that trellis coded modulation (TCM) is able to enhance a system's capability to separate signal streams in the detection process of MIMO systems. However, the computational complexity remains high as a maximum likelihood detection (MLD) algorithm is used in the scheme. Thus, a sphere decoding (SD) algorithm with a pseudo distance (PD) is proposed in this paper. The PD maintains the coding gain advantage of the TCM by keeping some potential paths connected unlike conventional SD which truncates them. It is shown that the proposed scheme can reduce the number of distance calculations by about 98% for the transmission of 3 signal streams. In addition, the proposed scheme improves the performance by about 2 dB at the bit error rate of 10-2.

Original languageEnglish
Pages (from-to)723-731
Number of pages9
JournalIEICE Transactions on Communications
Issue number3
Publication statusPublished - 2016 Mar


  • Overloaded MIMO
  • Pseudo distance
  • Sphere decoding
  • Trellis-coded modulation

ASJC Scopus subject areas

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


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