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2002

Optimal placement of training for frequency-selective block-fading channels

11 years 1 months ago
Optimal placement of training for frequency-selective block-fading channels
The problem of placing training symbols optimally for orthogonal frequency-division multiplexing (OFDM) and single-carrier systems is considered. The channel is assumed to be quasi-static with a finite impulse response of length ( + 1) samples. Under the assumptions that neither the transmitter nor the receiver knows the channel, and that the receiver forms a minimum mean square error (MMSE) channel estimate based on training symbols only, training is optimized by maximizing a tight lower bound on the ergodic training-based independent and identically distributed (i.i.d.) capacity. For OFDM systems, it is shown that the lower bound is maximized by placing the known symbols periodically in frequency. For single-carrier systems, under the assumption that the training symbols are placed in clusters of length (2 + 1), it is shown that the lower bound is maximized by a family of placement schemes called QPP- , where QPP stands for quasi-periodic placement. These placement schemes are formed...
Srihari Adireddy, Lang Tong, Harish Viswanathan
Added 23 Dec 2010
Updated 23 Dec 2010
Type Journal
Year 2002
Where TIT
Authors Srihari Adireddy, Lang Tong, Harish Viswanathan
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