OFDM signal detection in doubly selective channels with blockwise whitening of residual intercarrier interference and noise

Hai Wei Wang*, David W. Lin, Tzu-Hsien Sang

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Orthogonal frequency-division multiplexing (OFDM) is a popular broadband wireless transmission technique, but its performance can suffer severely from the intercarrier interference (ICI) induced by fast channel variation arising from high-speed motion. Existing ICI countermeasures usually address a few dominant ICI terms only and treat the residual similar to white noise. We show that the residual ICI has high normalized autocorrelation and that this normalized autocorrelation is insensitive to the multipath channel profile as well as a variety of other system and channel conditions. Consequently, the residual ICI plus noise can be whitened in a nearly channel-independent manner, leading to significantly improved detection performance. Simulation results confirm the theoretical analysis. In particular, they show that the proposed technique can significantly lower the ICI-induced error floor in maximum-likelihood sequence estimation (MLSE) designed to address a few dominant ICI terms.

Original languageEnglish
Article number6180091
Pages (from-to)684-694
Number of pages11
JournalIEEE Journal on Selected Areas in Communications
Volume30
Issue number4
DOIs
StatePublished - 1 May 2012

Keywords

  • Doppler spread
  • intercarrier interference (ICI)
  • maximum-likelihood sequence estimation (MLSE)
  • orthogonal frequency-division multiplexing (OFDM)
  • time-varying channels

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