A low-complexity adaptive multi-beam space-time receiver for CCI/ISI cancellation over frequency selective multipath channels

Chung Lien Ho, Ta-Sung Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A space-time (ST) receiver is proposed for combating the cochannel interference (CCI) and intersymbol interference (ISI) in a frequency-selective multipath environment. The scheme involves two stages. First, a set of adaptive beamformers pointed at a prescribed angular sector in space is constructed on an oversampled antenna array, each providing effective suppression of CCI and reception of desired signals. Second, a fractionally-spaced decision feedback equalizer (DFE) follows to eliminate the ISI left in beamformer outputs. In particular, both the beamformers and DFE can be realized in the form of a generalized sidelobe canceller (GSC) with the aid of channel estimation, and partial adaptivity is incorporated for reduced complexity processing and improved convergence. The proposed ST receiver can be employed as a multi-beam smart antenna system which is suitable for cellular communications. Computer simulations demonstrate that it can achieve nearly the same performance as the optimal ST minimum mean square error (MMSE) DFE with a much lower implementation complexity.

Original languageEnglish
Pages (from-to)137-161
Number of pages25
JournalWireless Personal Communications
Volume25
Issue number2
DOIs
StatePublished - 1 May 2003

Keywords

  • Antenna array
  • Beamformer
  • Equalizer
  • Interference cancellation
  • Space-time processing

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