Low Complexity Intercarrier Interference Equalization Technique in OFDM System

Feng YANG  WenJun ZHANG  ShuRong JIAO  Xiaoyun HOU  

IEICE TRANSACTIONS on Communications   Vol.E89-B    No.7    pp.2043-2049
Publication Date: 2006/07/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.7.2043
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
equalization,  OFDM,  ICI,  low complexity,  

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Intercarrier interference will cause the loss of subchannel orthogonality and increase the error floor in proportion to the Doppler frequency. In this paper, we firstly analyze the generation mechanism of intercarrier interference in OFDM. Then we propose an O(N log2N) complexity ICI equalizer for OFDM systems in the presence of double selective fading which is mainly bases on FFT operation. Simulation result shows that with only 6 iterations LCD-FFT can achieve better performance than the LS-equalizer. After 10 iterations LCD-FFT performs almost the same as MMSE equalizer.