Analysis and Optimization of RIS-Aided Massive MIMO with ZF Detectors and Imperfect CSI
Zhi K, Pan C, Zhou G, Ren H, Elkashlan M, Schober R (2022)
Publication Type: Conference contribution
Publication year: 2022
Journal
Publisher: Institute of Electrical and Electronics Engineers Inc.
Book Volume: 2022-May
Pages Range: 219-224
Conference Proceedings Title: IEEE International Conference on Communications
Event location: Seoul, KOR
ISBN: 9781538683477
DOI: 10.1109/ICC45855.2022.9838403
Abstract
This paper analyzes and optimizes the reconfigurable intelligent surface (RIS)-aided massive multiple-input multiple-output (MIMO) systems with zero-forcing (ZF) detectors under imperfect channel state information (CSI). We first propose a low-overhead minimum mean square error (MMSE) channel estimator, and then derive and analyze closed-form expressions for the uplink achievable rate. Our analytical results prove that: 1) regardless of the RIS phase shift design, the rate of all users scales at least on the order of mathcal{O}left( {{{log }_2}(MN)} right), where M and N are the numbers of antennas and reflecting elements, respectively; 2) by aligning the RIS phase shifts to one user, the rate of this user can at most scale on the order of mathcal{O}left( {{{log }_2}(MN)} right). Furthermore, we propose a low-complexity majorization-minimization (MM)-based algorithm to optimize the sum user rate, where closed-form solutions are obtained in each iteration. Finally, simulation results validate all derived analytical results. Our simulation results also show that the maximum sum rate can be closely approached by simply aligning the RIS phase shifts to an arbitrary user.
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United Kingdom (GB)
China (CN)How to cite
APA:
Zhi, K., Pan, C., Zhou, G., Ren, H., Elkashlan, M., & Schober, R. (2022). Analysis and Optimization of RIS-Aided Massive MIMO with ZF Detectors and Imperfect CSI. In IEEE International Conference on Communications (pp. 219-224). Seoul, KOR: Institute of Electrical and Electronics Engineers Inc..
MLA:
Zhi, Kangda, et al. "Analysis and Optimization of RIS-Aided Massive MIMO with ZF Detectors and Imperfect CSI." Proceedings of the 2022 IEEE International Conference on Communications, ICC 2022, Seoul, KOR Institute of Electrical and Electronics Engineers Inc., 2022. 219-224.
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