Blind and semiblind channel and carrier frequency-offset estimation in orthogonally space-time block coded MIMO systems

Shahram Shahbazpanahi, Alex B. Gershman, Georgios B. Giannakis

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

In this paper, the problem of joint channel and carrier frequency offset (CFO) estimation is studied in the context of multiple-input multiple-output (MIMO) communications based on orthogonal space-time-block codes (OSTBCs). A new blind approach is proposed to jointly estimate the channel matrix and the CFO parameters using a relaxed maximum likelihood (ML) estimator that, for the sake of simplicity, ignores the finite alphabet constraint. Although the proposed technique can be applied to the majority of OSTBCs, there are, however, a few codes that suffer from an intrinsic ambiguity in the joint channel, CFO, and symbol estimates. For such specific OSTBCs, a semiblind modification of the proposed approach is developed that resolves the aforementioned estimation ambiguity. Our simulation results demonstrate that although the finite alphabet constraint is relaxed, the performance of the proposed techniques approaches that of the informed (fully frequency-synchronized and coherent) receiver, provided that a sufficient number of data blocks is available for each channel realization.

Original languageEnglish (US)
Pages (from-to)702-711
Number of pages10
JournalIEEE Transactions on Signal Processing
Volume56
Issue number2
DOIs
StatePublished - Feb 1 2008

Keywords

  • Blind channel and carrier frequency offset estimation
  • Multiple-input multiple-output (MIMO) communications
  • Orthogonal space-time block codes

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