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Training and Voids in Receive Antenna Subset Selection in Time-Varying Channels

Kristem, Vinod and Mehta, Neelesh B and Molisch, Andreas F (2010) Training and Voids in Receive Antenna Subset Selection in Time-Varying Channels. In: IEEE Transactions on Wireless Communications, 10 (6). pp. 1992-2003.

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Receive antenna selection (AS) provides many benefits of multiple-antenna systems at drastically reduced hardware costs. In it, the receiver connects a dynamically selected subset of N available antennas to the L available RF chains. Due to the nature of AS, the channel estimates at different antennas, which are required to determine the best subset for data reception, are obtained from different transmissions of the pilot sequence. Consequently, they are outdated by different amounts in a time-varying channel. We show that a linear weighting of the estimates is necessary and optimum for the subset selection process, where the weights are related to the temporal correlation of the channel variations. When L is not an integer divisor of N , we highlight a new issue of ``training voids'', in which the last pilot transmission is not fully exploited by the receiver. We then present new ``void-filling'' methods that exploit these voids and greatly improve the performance of AS. The optimal subset selection rules with void-filling, in which different antennas turn out to have different numbers of estimates, are also explicitly characterized. Closed-form equations for the symbol error probability with and without void-filling are also developed.

Item Type: Journal Article
Publication: IEEE Transactions on Wireless Communications
Publisher: IEEE
Additional Information: Copyright 2011 IEEE. Personal use of this material is permitted.However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: Training;antenna selection;diversity methods;fading channels; estimation;error analysis;quadrature phase shift keying; Doppler
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Division of Electrical Sciences > Electrical Engineering
Date Deposited: 18 Jul 2011 09:21
Last Modified: 18 Jul 2011 09:21
URI: http://eprints.iisc.ac.in/id/eprint/39101

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