OFDM Signal Detection in Doubly Selective Channels with Blockwise Whitening of Residual Intercarrier Interference and Noise

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...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 2012-05, Vol.30 (4), p.684-694
Main Authors: Hai-wei Wang, Lin, D. W., Tzu-Hsien Sang
Format: Article
Language:English
Subjects:
Approximation methods
Autocorrelation
Blocking
Channels
Correlation
Discrete Fourier transforms
Doppler effect
Doppler spread
High speed
intercarrier interference (ICI)
Interference
maximum-likelihood sequence estimation (MLSE)
Noise
OFDM
Orthogonal Frequency Division Multiplexing
orthogonal frequency-division multiplexing (OFDM)
Signal detection
Simulation
Studies
time-varying channels
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Summary: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.
ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2012.120503