Time-varying channel estimation for OFDM with extended observation window

Authors:
Dan Shan;Paul Richardson;Weidong Xiang;Athanasios V. Vasilakos
Affiliations:
University of Michigan - Dearborn, Dearborn, MI, USA;University of Michigan - Dearborn, Dearborn, MI, USA;University of Michigan - Dearborn, Dearborn, MI, USA;Middle East Technical University, Northern Cyprus Campus, Mersin, Turkey
Venue:
Proceedings of the ninth ACM international workshop on Vehicular inter-networking, systems, and applications
Year:
2012

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Abstract

Orthogonal Frequency-Division Multiplexing (OFDM) systems operating in high mobility environments experience time-varying channel, which leads to serious inter-carrier-interferences. Basis Expansion Model (BEM) is a widely used technique to estimate the time-varying channel, but can only capture the time-varying characteristics within each single OFDM block one by one in traditional algorithms. A method to extend the observation window of BEM based algorithms to the range of multiple OFDM blocks is established and adapted to pilot-assisted OFDM systems, where pilot signals in multiple OFDM blocks are converted into time-domain and connected together. As a result, the time-varying channel can be estimated more accurately, with comparable complexity as those of traditional algorithms.