Low complexity iterative method of equalization for OFDM in doubly selective channels

S. Ahmed*, M. Sellathurai, J. A. Chambers

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

In a multi-path channel an orthogonal frequency division multiplexing (OFDM) system is very robust to frequency selective fading, but it is sensitive to the time selective fading of the mobile channel. Time selectivity of the channel causes inter-carrier-interference (ICI) in OFDM, thereby degrading the performance significantly and increasing the computational complexity of the receiver. On the other hand, it introduces temporal and frequency diversity. In this work, a low complexity iterative method is addressed to compensate for the adverse effects of time and frequency selectivity of the channel while achieving the diversity benefits. The method splits the equalization into two stages. The first stage exploits the sparsity present in the channel convolution matrix (CCM) to estimate the time domain transmitted samples and the second stage performs the maximum a posteriori (MAP) detection of the frequency domain symbols. Simulation results show the performance of the proposed algorithm is close to the match filter bound (MFB) with lower computational complexity.

Original languageEnglish (US)
Title of host publicationConference Record of The Thirty-Ninth Asilomar Conference on Signals, Systems and Computers
Pages687-691
Number of pages5
Volume2005
StatePublished - 2005
Externally publishedYes
Event39th Asilomar Conference on Signals, Systems and Computers - Pacific Grove, CA, United States
Duration: Oct 28 2005Nov 1 2005

Other

Other39th Asilomar Conference on Signals, Systems and Computers
CountryUnited States
CityPacific Grove, CA
Period10/28/0511/1/05

Keywords

  • Doubly selective channel
  • Iterative equalization
  • OFDM

ASJC Scopus subject areas

  • Engineering(all)

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