Adaptive decision feedback space-time equalization with generalized sidelobe cancellation

Yinman Lee*, Wen-Rong Wu

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

In wireless communications, cochannel interference (CCI) and intersymbol interference (ISI) are two main factors that limit system performance. Conventionally, a beamformer is used to reduce CCI, whereas an equalizer is used to compensate for ISI. These two devices can be combined into one as space-time equalizer (STE). A training sequence is usually required to train the STE prior to its use. In some applications, however, spatial information corresponding to a desired user is available, but the training sequence is not. In this paper, we propose an adaptive decision feedback STE to cope with this problem. Our scheme consists of an adaptive decision feedback generalized sidelobe canceller (DFGSC), a blind decision feedback equalizer (DFE), and a channel estimator. Due to the feedback operation, the proposed DFGSC is not only superior to the conventional generalized sidelobe canceller but also robust to multipath channel propagation and spatial signature error. Theoretical results are derived for optimum solutions, convergence behavior, and robustness properties. With the special channel-aided architecture, the proposed blind DFE can reduce the error propagation effect and be more stable than the conventional blind DFE. Simulation results show that the proposed STE is effective in mitigating both CCI and ISI, even in severe channel environments.

Original languageEnglish
Pages (from-to)2894-2906
Number of pages13
JournalIEEE Transactions on Vehicular Technology
Volume57
Issue number5
DOIs
StatePublished - 8 Oct 2008

Keywords

  • Blind equalization
  • Channel estimation
  • Decision feedback equalizer (DFE)
  • Generalized sidelobe canceller (GSC)
  • Space-time equalizer (STE)

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