Massive MIMO performance with imperfect channel reciprocity and channel estimation error

Mi, D., Dianati, M., Zhang, L., Muhaidat, S. and Tafazolli, R. (2017) Massive MIMO performance with imperfect channel reciprocity and channel estimation error. IEEE Transactions on Communications, 65(9), pp. 3734-3749. (doi:10.1109/TCOMM.2017.2676088)

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Abstract

Channel reciprocity in time-division duplexing (TDD) massive MIMO (multiple-input multiple-output) systems can be exploited to reduce the overhead required for the acquisition of channel state information (CSI). However, perfect reciprocity is unrealistic in practical systems due to random radio-frequency (RF) circuit mismatches in uplink and downlink channels. This can result in a significant degradation in the performance of linear precoding schemes which are sensitive to the accuracy of the CSI. In this paper, we model and analyse the impact of RF mismatches on the performance of linear precoding in a TDD multi-user massive MIMO system, by taking the channel estimation error into considerations. We use the truncated Gaussian distribution to model the RF mismatch, and derive closed-form expressions of the output SINR (signal-to-interference-plus-noise ratio) for maximum ratio transmission and zero forcing precoders. We further investigate the asymptotic performance of the derived expressions, to provide valuable insights into the practical system designs, including useful guidelines for the selection of the effective precoding schemes. Simulation results are presented to demonstrate the validity and accuracy of the proposed analytical results.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Zhang, Dr Lei
Authors: Mi, D., Dianati, M., Zhang, L., Muhaidat, S., and Tafazolli, R.
College/School:College of Science and Engineering > School of Engineering
Journal Name:IEEE Transactions on Communications
Publisher:IEEE
ISSN:0090-6778
ISSN (Online):1558-0857
Published Online:01 March 2017
Copyright Holders:Copyright © 2016 IEEE
First Published:First published in IEEE Transactions on Communications 65(9): 3734-3749
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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