On the Throughput of Large MIMO Beamforming Systems With Channel Aging

Chopra, Ribhu and Murthy, Chandra R and Suraweera, Himal A (2016) On the Throughput of Large MIMO Beamforming Systems With Channel Aging. In: IEEE SIGNAL PROCESSING LETTERS, 23 (11). pp. 1523-1527.

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Abstract

We study the problem of throughput optimization in large multiple-input multiple-output ( MIMO) beamforming systems with channel aging, as the number of transmit and receive antennas is increased. We quantify the effective channel coherence time in terms of the intertraining interval, which is the time after which the channel state information needs to be reestimated to avoid loss in performance due to outdated channel estimates. Conventional wisdom suggests that the coherence time of large MIMO systems should decrease with increasing number of antennas, because the system has a large number of independently varying channel coefficients. On the contrary, we show that the effective channel coherence time increases with the number of antennas. We optimize the throughput with respect to the symbol and pilot energies, the number of antennas, frame duration, and target SNR. This analysis brings out the important fact that the effective channel coherence time critically depends on the underlying signaling scheme, and not only on the temporal correlation coefficient of the wireless channel.

Item Type:	Journal Article
Publication:	IEEE SIGNAL PROCESSING LETTERS
Additional Information:	Copy right for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	20 May 2017 04:07
Last Modified:	20 May 2017 04:07
URI:	http://eprints.iisc.ac.in/id/eprint/56709

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