Low Complex Windowing Method of ICI Reduction for OFDM Systems in Time-Varying Multipath Channels
Date Issued
2010
Date
2010
Author(s)
Chang, Chan-Shuo
Abstract
Orthogonal frequency division multiplexing (OFDM) systems may experience significant inter-carrier interference (ICI) when used in time- and frequency-selective, or doubly selective, channels. In high mobility environment mobile communication suffers from critical Doppler effect, the performance is decreasing due to fast fading. The structure of the traditional demodulation system in time-invariant channel can not conquer this problem, so that the BER is rapidly rising.
In this thesis we take the advantage of the mechanism generated by ICI effect, and we proposed calculating method of the equalizer. This method contains two stages, the first stage applies time-domain windowing to restrict ICI support, and the second stage uses iterative estimation to estimate finite-alphabet frequency-domain symbols. Simulation results indicate that our equalizer has significant performance and complexity advantages over the classical linear MMSE estimator in doubly selective channels.
Subjects
Doppler effect
ICI
equalization
OFDM
windowing
iterative estimation
complexity
Type
thesis
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