Secrecy rate analysis for reconfigurable intelligent surface-assisted mimo communications with statistical CSI

In this paper, a reconfigurable intelligent surface (RIS)-assisted MIMO wireless secure communication system is considered, in which a base station (BS) equipped with multiple antennas exploits statistical channel state information to communicate with a legitimate multi-antenna user, in the presence...

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Bibliographic Details
Published in:China communications Vol. 18; no. 3; pp. 52 - 62
Main Authors: Liu, Jie, Zhang, Jun, Zhang, Qi, Wang, Jue, Sun, Xinghua
Format: Journal Article
Language:English
Published: China Institute of Communications 01.03.2021
Subjects:
alternating optimization algorithm
Communication system security
Covariance matrices
Downlink
ergodic secrecy rate
MISO communication
Optimization
reconfigurable intelligent surface
Rician channels
statistical CSI
Wireless communication
ISSN:1673-5447
Online Access:Get full text
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Summary:In this paper, a reconfigurable intelligent surface (RIS)-assisted MIMO wireless secure communication system is considered, in which a base station (BS) equipped with multiple antennas exploits statistical channel state information to communicate with a legitimate multi-antenna user, in the presence of an eavesdropper, also equipped with multiple antennas. We firstly obtain an analytical expression of the ergodic secrecy rate based on the results of large-dimensional random matrix theory. Then, a jointly alternating optimization algorithm with the method of Taylor series expansion and the projected gradient ascent method is proposed to design the transmit covariance matrix at the BS, as well as the diagonal phase- shifting matrix to maximize the ergodic secrecy rate. Simulations are conducted to demonstrate the accuracy of the derived analytical expressions, as well as the superior performance of our proposed algorithm.
ISSN:1673-5447
DOI:10.23919/JCC.2021.03.005