Optimal Training for Block Transmissions over Doubly Selective Wireless Fading Channels (2003)
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BibTeX
@MISC{Ma03optimaltraining,
author = {Xiaoli Ma and Georgios B. Giannakis and Shuichi Ohno},
title = {Optimal Training for Block Transmissions over Doubly Selective Wireless Fading Channels},
year = {2003}
}
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Abstract
High data rates give rise to frequency-selective propagation, while carrier frequency-offsets and mobility-induced Doppler shifts introduce time-selectivity in wireless links. To mitigate the resulting timeand frequency-selective (or doubly-selective) channels, optimal training sequences have been designed only for special cases: Pilot Symbol Assisted Modulation (PSAM) for time-selective channels, and pilot tone assisted OFDM for frequency-selective channels. Relying on a basis expansion channel model, we design in this paper low complexity optimal PSAM for block transmissions over doubly-selective channels. The optimality in designing our PSAM parameters consists of maximizing a tight lower bound on the average channel capacity that is shown to be equivalent to the minimization of the minimum mean-square channel estimation error. Numerical results corroborate our theoretical designs.
