Adaptive Windowing for ICI Mitigation in Vehicular Communications

Evangelos Vlachos, Aris Lalos, Kostas Berberidis, John Thompson

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The performance of orthogonal frequency division multiplexing systems in vehicular environments suffers from intercarrier interference (ICI) and the inherent non stationarity of the channel statistics. Receiver windowing constitutes an effective technique for enhancing the banded structure of the frequency-domain channel matrix, thus improving the effectiveness of a banded equalizer for ICI mitigation. However, its optimality has been verified only for stationary channels with perfectly known statistics. In non stationary channels, the second-order statistics have to be tracked and the optimal performance can be achieved at the expense of cubic complexity over the number of the subcarriers. To overcome this limitation, an adaptive windowing technique is proposed that is able to track directly an optimal receiver window in terms of average signal-to-interference noise ratio, requiring only linear complexity. Extensive simulation results verify both the ability of the proposed approach to track the time varying channel statistics and its increased robustness to channel estimation errors that are common in vehicular environments.
Original languageEnglish
JournalIEEE Wireless Communications Letters
Early online date31 May 2018
DOIs
Publication statusPublished - 31 Dec 2018

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