A low-complexity ICI mitigation method for high-speed mobile OFDM systems

Chao Yuan Hsu*, Wen-Rong Wu

*Corresponding author for this work

研究成果: Conference contribution同行評審

5 引文 斯高帕斯(Scopus)

摘要

Orthogonal frequency division multiplexing (OFDM) is a promising technique for frequency-selective fading channels. However, in high-speed mobile environments, the channel may be time-variant in one OFDM symbol. This will incur the intercarrier interference (ICI) degrading seriously the performance of an OFDM system. A simple remedy is to apply the zero-forcing (ZF) equalization method. Unfortunately, the direct ZF method requires an inverse of a huge matrix requiring a prohibitively high complexity. In this paper, we propose a low-complexity ZF method for ICI mitigation. The main idea is to explore the special structure of the ICI matrix and apply the Newton's iterative matrix inversion method. With our formulation, fast Fourier transforms (FFTs) can be used to reduce the complexity. The proposed method can reduce the complexity from the order of Ο(Nc3) to that of Ο(Nclog2Nc) where Nc is the number of subcarriers. Computer simulations show that the proposed method can cancel the ICI effectively and at the same time reduces the computational requirement dramatically.

原文English
主出版物標題ISCAS 2006
主出版物子標題2006 IEEE International Symposium on Circuits and Systems, Proceedings
頁面4511-4514
頁數4
DOIs
出版狀態Published - 1 十二月 2006
事件ISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems - Kos, Greece
持續時間: 21 五月 200624 五月 2006

出版系列

名字Proceedings - IEEE International Symposium on Circuits and Systems
ISSN(列印)0271-4310

Conference

ConferenceISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems
國家Greece
城市Kos
期間21/05/0624/05/06

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