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Symbol-timing estimation in space-time coding systems based on orthogonal training sequences

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2005年第2期4卷 603-613页

作者： Wu, YC Chan, SC Serpedin, E Univ Hong Kong Dept Elect & Elect Engn Hong Kong Hong Kong Peoples R China

Space-time coding has received considerable interest recently as a simple transmit diversity technique for improving the capacity and data rate of a channel without bandwidth expansion. Most research in space-time coding, however, assumes that the symbol timing at the receiver is perfectly known. In practice, this has to be estimated with high accuracy. In this paper, a new symbol-timing estimator for space-time coding systems is proposed. It improves the conventional algorithm of Naguib et al. such that accurate timing estimates can be obtained even if the over-sampling ratio is small. Analytical mean-square error (MSE) expressions are derived for the proposed estimator. Simulation and analytical results show that for a modest oversampling ratio (such as Q equal to four), the MSE of the proposed estimator is significantly smaller than that of the conventional algorithm. The effects of the number of transmit and receive antennas, the oversampling ratio, and the length of training sequence on the MSE are also examined.

关键词： approximated log-likelihood function space-time coding symbol-timing recovery training sequences

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