A reduced complexity maximum likelihood detection for OFDM/SDMA wireless LANs

Junqiang Li, Khaled Letaief, Zhigang Cao

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Space division multiple access (SDMA) is a promising solution for the significant increase of system capacity and spectral efficiency in Wireless LANs (Local area network). In order to make the system more robust against the detrimental effects of frequency selective fading channels, a combined OFDM (Optical frequency division multiplexing)/SDMA based WLAN has been recently proposed. In particular, it has been shown that MLD (Maximum Likelihood Detection) has the best SNR performance compared with other detection schemes such as LMMSE (Least minimum mean square error) and SIC (Successive Interference Cancellation) based ones. However, the complexity of MLD increases exponentially in the number of users and constellation size. In this paper, a new multi-stage low complexity MLD scheme using sensitive bits algorithm (SB-MLD) is proposed. It is shown that it can greatly reduce the computational complexity with a minimal penalty in performance compared with the exhaustive MLD scheme.

Original languageEnglish
Pages (from-to)92-98
Number of pages7
JournalChinese Journal of Electronics
Volume11
Issue number1
Publication statusPublished - Jan 2002
Externally publishedYes

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Keywords

  • Indoor multipath fading channels
  • Joint detection
  • OFDM/SDMA
  • Wireless communications

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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