A New Time Domain Intercarrier Interference Reduction Method for OFDM Systems in Time Varying Channels

Jinyong LEE  Younglok KIM  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.11   pp.3492-3497
Publication Date: 2012/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.3492
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
intercarrier interference,  ICI reduction,  OFDM,  time varying channel,  

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In orthogonal frequency division multiplexing (OFDM) based systems, intercarrier interference (ICI) created by the time varying property of wireless fading channels, degrades the data detection performance. This degradation strengthens especially when the mobile speed is relatively high or the number of subcarriers is large. Here, we interpret the time varying channel as the linear transformation of the time invariant channel impulse response. By using this new channel model, the time varying component can be reduced in the time domain by applying the inverse transformation to the received sequence. Then, the remaining time invariant channel component is removed by the equalization in the frequency domain. Some complexity reduction schemes are also proposed to make the proposed method feasible for practical implementation. The simulation results show that the new method offers a significant improvement in terms of bit error rate performance, especially when the number of subcarriers is larger than about 500.