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| Performance Improvement of Time-Varing OFDM Channel Estimation and Equalization using ICI Self-Cancellation |
| Qin Wen Peng Qi-cong |
| School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu 610051, China |
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Abstract Rapidly time-varying channels degrade the performance of the Orthogonal Frequency Division Multiplexing (OFDM) due to severe InterCarrier-Interference (ICI). The most effective method of canceling the ICI is frequency equalization. But, it relies on precise channel estimation. Basis Expansion Model (BEM) can approximate time-varying channel accurately. And since then, only some finite model parameters need to be estimated to reconstruct the channel. However, the pilot-symbol-aided parameter estimation is still significantly affected by ICI from near non-pilot-symbol. So, in this work an ICI-self-cancellation parameter estimation method is proposed for BEM, by utilizing the high correlation between subcarrier ICIs. Simulations show better performance than the simplex BEM methods.
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Received: 05 March 2007
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Corresponding Authors:
Qin Wen
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2008, Vol. 30 
