Optimal Placement of Training for Channels
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Optimal Pilot Placement for Time-Varying Channels
Two major training techniques for wireless channels are time division multiplexed (TDM) training and superimposed training. For the TDM schemes with regular periodic placements (RPP), the closedform expression for the steady-state minimum mean square error (MMSE) of channel estimate is obtained as a function of placement for Gauss-Markov flat fading channels. We then show that, among all period...
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[3] S. Adireddy and L. Tong, " Optimal placement of known symbols for slowly varying frequency selective channels, " accepted to IEEE Trans. Wireless Communications, 2003. Optimal placement of known symbols for frequency-selective block-fading channels, " IEEE Trans. [7] B. Hassibi and B. Hochwald, " How much training is needed in multiple-antenna wireless links, "
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The problem of training symbol placement for the estimation of block-fading channel is first considered. The channel is frequency selective with correlated random taps. The Cramér-Rao Bound (CRB) on the mean square error (MSE) of channel estimators is derived and minimized with respect to the pilot symbols and their placement. It is shown that, among all orthogonal pilot sequence placements, th...
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The problem of optimal placement of pilot symbols is considered for single carrier packet-based transmission over time varying channels. Both flat and frequency-selective fading channels are considered, and the time variation of the channel is modeled by Gauss-Markov process. The semi-blind linear minimum mean-square error (LMMSE) channel estimation is used. Two different performance criteria, ...
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