Robust receiver design for MIMO single-carrier block transmission over time-varying dispersive channels against imperfect channel knowledge

Chih Yuan Lin*, Jwo-Yuh Wu, Ta-Sung Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We consider MIMO single-carrier block transmission over time-varying multipath channels, under the assumption that the channel parameters are not exactly known but are estimated via the least-squares training technique. While the channel temporal variation is known to negate the tone-by-tone frequency-domain equalization facility, it is otherwise shown that in aie time domain the signal signatures can be arranged into groups of orthogonal components, leading to a very natural yet efficient group-by-group symbol recovery scheme. To realize this figure of merit we propose a constrained-optimization based receiver which also takes into account the mitigation of channel mismatch effects caused by time variation and imperfect estimation. The optimization problem is formulated in an equivalent unconstrained generalized-sidelobe-canceller setup. This enables us to directly model the channel mismatch effect into the system equations through the perturbation technique and, in turn, to further exploit the statistical assumptions on channel temporal variation and estimation errors for deriving a closedform solution. Within the considered framework the proposed robust equalizer can be combined with the successive interference cancellation mechanism for further performance enhancement. Flop count evaluation and numerical simulation are used to evidence the advantages of the proposed scheme.

Original languageEnglish
Article number4657326
Pages (from-to)3799-3812
Number of pages14
JournalIEEE Transactions on Wireless Communications
Volume7
Issue number10
DOIs
StatePublished - 1 Oct 2008

Keywords

  • Channel estimation
  • Constrained optimization
  • Generalized sidelobe canceller
  • MIMO
  • Perturbation analysis
  • Single carrier block transmission
  • Time-varying multipath channels

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