A Low Complexity MMSE Equalizer for OFDM Systems over Time-Varying Channels

Shaoping CHEN  Guangfa DAI  Hongwen TANG  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.1   pp.330-333
Publication Date: 2008/01/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.1.330
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
OFDM,  intercarrier interference,  MMSE equalizer,  time-varying channels,  

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A low complexity minimum mean squared error (MMSE) equalizer for orthogonal frequency division multiplexing (OFDM) systems over time-varying channels is presented. It uses a small matrix of dominant partial channel information and recursive calculation of matrix inverse to significantly reduce the complexity. Theoretical analysis and simulations results are provided to validate its significant performance or complexity advantages over the previously published MMSE equalizers.