Blind Channel Estimation for Downlink Massive MIMO Systems with Imperfect Channel Reciprocity

Chopra, R and Murthy, CR and Suraweera, HA and Larsson, EG (2020) Blind Channel Estimation for Downlink Massive MIMO Systems with Imperfect Channel Reciprocity. In: IEEE Transactions on Signal Processing, 68 . pp. 3132-3145.

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Abstract

We consider the performance of time-division duplex (TDD) massive multiple-input multiple-output (MIMO) with imperfect calibration of the transmit and receive radio frequency chains. By deriving the achievable signal-to-interference-plus-noise ratio (SINR) and the per-user bit error rate (BER) for constant modulus constellations, we establish that, under linear precoding, reciprocity imperfections can result in substantial reduction of the array gain. To mitigate this loss, we propose an algorithm for blind estimation of the effective channel gain at each user. We show that, with sufficiently many downlink data symbols, our blind channel estimation algorithm restores the array gain. In addition, the proposed blind gain estimation algorithm can improve performance compared to standard hardening-based receivers even under perfect reciprocity. Following this, we derive the BERs for non-constant modulus constellations, viz. M-PAM and M-QAM. We corroborate all our derived results using numerical simulations.

Item Type:	Journal Article
Publication:	IEEE Transactions on Signal Processing
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright of this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Bit error rate; Blind equalization; MIMO systems; Signal interference; Signal to noise ratio, Blind channel estimation; Blind estimations; Imperfect channels; Improve performance; Radio frequency chains; Signal to interference plus noise ratio; Substantial reduction; Time division duplex, Channel estimation
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	20 Aug 2020 06:02
Last Modified:	20 Aug 2020 06:02
URI:	http://eprints.iisc.ac.in/id/eprint/66001

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