DocumentCode :
757649
Title :
Optimal training for MIMO frequency-selective fading channels
Author :
Ma, Xiaoli ; Yang, Liuqing ; Giannakis, Georgios B.
Author_Institution :
Dept. of Electr. & Comput. Eng., Auburn Univ., AL, USA
Volume :
4
Issue :
2
fYear :
2005
fDate :
3/1/2005 12:00:00 AM
Firstpage :
453
Lastpage :
466
Abstract :
High data rates give rise to frequency-selective propagation effects. Space-time multiplexing and/or coding offer attractive means of combating fading and boosting capacity of multi-antenna communications. As the number of antennas increases, channel estimation becomes challenging because the number of unknowns increases, and the power is split at the transmitter. Optimal training sequences have been designed for flat-fading multi-antenna systems or for frequency-selective single transmit antenna systems. We design a low-complexity optimal training scheme for block transmissions over frequency-selective channels with multiple antennas. The optimality in designing our training schemes consists of maximizing a lower bound on the ergodic (average) capacity that is shown to be equivalent to minimizing the mean square error of the linear channel estimator. Simulation results confirm our theoretical analysis that applies to both single- and multicarrier transmissions.
Keywords :
MIMO systems; channel capacity; channel coding; channel estimation; computational complexity; fading channels; mean square error methods; modulation; space-time codes; transmitting antennas; MIMO frequency-selective fading channel; antenna array; channel capacity; channel estimation; computational complexity; ergodic capacity; fading channel; mean square error method; multiantenna communication; multiinput multioutput system; optimal training sequence; pilot symbol-aided modulation; space-time multiplexing; transmit antenna system; Analytical models; Antennas and propagation; Boosting; Channel estimation; Frequency; Frequency-selective fading channels; MIMO; Mean square error methods; Transmitters; Transmitting antennas; Channel estimation; ergodic capacity; frequency-selective channels; multi-input multi-output (MIMO) systems; pilot symbol-aided modulation;
fLanguage :
English
Journal_Title :
Wireless Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1276
Type :
jour
DOI :
10.1109/TWC.2004.842998
Filename :
1413212
Link To Document :
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