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Published in:
2015 | OriginalPaper | Chapter
38. Doubly Selective Channel Estimation in OFDM System Using Optimized Discrete Prolate Spheroidal Sequences
Authors : Xi Quan, Fei Qi, Xiaojun Jing, Songlin Sun, Hai Huang, Na Chen
Published in: The Proceedings of the Third International Conference on Communications, Signal Processing, and Systems
Publisher: Springer International Publishing
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Abstract
In orthogonal frequency division multiplexing (OFDM) system, basis expansion model (BEM) has been commonly used because of the significant variation of doubly-selective channels. In such a model, the channel taps are estimated by linear combinations of prescribed basis function. We propose a method of making better use of discrete prolate spheroidal sequence, also called Slepian sequence with an optimized parameter in a mathematical relationship with Doppler shift, and then using inverse reconstruction method to recover the BEM coefficients of the channel taps. Simulation results have confirmed the validity of this improvement and also proved an enhanced use of Slepian sequence than other basis functions in high mobility environments.