標題: OFDM Signal Detection in Doubly Selective Channels with Blockwise Whitening of Residual Intercarrier Interference and Noise
作者: Wang, Hai-wei
Lin, David W.
Sang, Tzu-Hsien
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: Doppler spread;intercarrier interference (ICI);maximum-likelihood sequence estimation (MLSE);orthogonal frequency-division multiplexing (OFDM);time-varying channels
公開日期: 1-五月-2012
摘要: 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.
URI: http://hdl.handle.net/11536/15987
ISSN: 0733-8716
期刊: IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
Volume: 30
Issue: 4
結束頁: 684
顯示於類別:期刊論文


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  1. 000303327100003.pdf