Effective Data Detection Algorithms for OFDM Systems over Time-Varying Multipath Fading Channels

For fast-fading time-varying channels, channel variations over an OFDM symbol destroy the orthogonality among subcarriers. The resulting intercarrier interference (ICI) degrades the system performance. The degradation becomes severer as mobile speed, carrier frequency, or symbol duration increase. I...

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Bibliographic Details
Published in2008 IEEE 10th International Symposium on Spread Spectrum Techniques and Applications pp. 475 - 480
Main Authors Chin-Jung Tsai, Sau-Gee Chen, Hsiao-Lan Chiang
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.08.2008
Subjects
Bit error rate
Complexity theory
Fading
Frequency domain analysis
Interference
OFDM
Time domain analysis
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Summary:For fast-fading time-varying channels, channel variations over an OFDM symbol destroy the orthogonality among subcarriers. The resulting intercarrier interference (ICI) degrades the system performance. The degradation becomes severer as mobile speed, carrier frequency, or symbol duration increase. In this work, based on the existing data detection methods, several modifications are proposed to improve the system performances and to reduce the computational complexity. The proposed methods effectively use frequency diversity provided by time-varying channels. As a result, the proposed techniques noticeably outperform the conventional methods, including the ICI cancellation method and zero-forcing (ZF) detection. For implementation, the proposed methods are modified to have acceptable complexity.
ISBN:1424422043
9781424422043
ISSN:1943-7439
1943-7447
DOI:10.1109/ISSSTA.2008.94