Hybrid EM and KF receiver of MIMO OFDM systems in time-varying environments

Hsin Chang Wu, I. Tai Lu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, simultaneous channel estimation, carrier frequency offset (CFO) estimation, and data decision are considered for multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. It is shown that the expectation maximization (EM) approach is complementary to the Kalman filter (KF) approach where the latter provides poor CFO estimation but good channel estimation and the former provides poor channel estimation but good CFO estimation. A hybrid combination of EM and KF approaches is proposed to take advantages of the strengths and avoid the weaknesses of both approaches. Numerical results have shown the hybrid combination is around 1.2dB better than the non-hybrid approaches (EM or KF) in BER performances. The complexity of the hybrid approach is comparable to the KF approach and is much lower than the EM approach.

Original languageEnglish (US)
Title of host publication2009 IFIP International Conference on Wireless and Optical Communications Networks, WOCN 2009
DOIs
StatePublished - 2009
Event2009 IFIP International Conference on Wireless and Optical Communications Networks, WOCN 2009 - Cairo, Egypt
Duration: Apr 28 2009Apr 30 2009

Publication series

Name2009 IFIP International Conference on Wireless and Optical Communications Networks, WOCN 2009

Other

Other2009 IFIP International Conference on Wireless and Optical Communications Networks, WOCN 2009
CountryEgypt
CityCairo
Period4/28/094/30/09

Keywords

  • Carrier frequency offset (CFO)
  • Expectation maximization (EM)
  • Hybrid approach
  • Kalman filter (KF)
  • Multi-input multi-output (MIMO)
  • Orthogonal frequency division multiplexing (OFDM)

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Information Systems
  • Electrical and Electronic Engineering
  • Communication

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