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Reconfigurable intelligent surfaces (RISs) have attracted significant attention due to their capability in customizing wireless communication environments to improve system performance. In this study, we investigate the performance of an RIS-assisted multi-user multiple-input single-output wireless communication system, considering the impact of channel aging caused by users’ relative movements. In particular, first, we propose a model incorporating the joint effects of channel aging and channel estimation errors to investigate the performance of the RIS-assisted system. Then, we derive novel closed-form expressions for characterizing the sum spectral efficiency with zero-forcing precoding. From our analysis, we unveil that an increase in the temporal channel correlation coefficient, the number of base station antennas, and the received power at the users could help improve system performance. Furthermore, increasing the number of reflecting elements M of the RIS generally yields a good system performance, but with a diminishing return when M is sufficiently large. Finally, simulation results are presented to validate the accuracy of the analytical results.


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Performance analysis of reconfigurable intelligent surface assisted systems under channel aging

Show Author's information Yan Zhang1Jiayi Zhang1Derrick Wing Kwan Ng2Huahua Xiao3( )Bo Ai4
School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China
School of Electrical Engineering and Telecommunications, University of New South Wales, Sydney 2052, Australia
ZTE Corporation, and State Key Laboratory of Mobile Network and Mobile Multimedia Technology, Shenzhen 518057, China
State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China

Abstract

Reconfigurable intelligent surfaces (RISs) have attracted significant attention due to their capability in customizing wireless communication environments to improve system performance. In this study, we investigate the performance of an RIS-assisted multi-user multiple-input single-output wireless communication system, considering the impact of channel aging caused by users’ relative movements. In particular, first, we propose a model incorporating the joint effects of channel aging and channel estimation errors to investigate the performance of the RIS-assisted system. Then, we derive novel closed-form expressions for characterizing the sum spectral efficiency with zero-forcing precoding. From our analysis, we unveil that an increase in the temporal channel correlation coefficient, the number of base station antennas, and the received power at the users could help improve system performance. Furthermore, increasing the number of reflecting elements M of the RIS generally yields a good system performance, but with a diminishing return when M is sufficiently large. Finally, simulation results are presented to validate the accuracy of the analytical results.

Keywords: reconfigurable intelligent surface (RIS), channel aging, spectral efficiency

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Published: 30 March 2022
Issue date: March 2022

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Acknowledgment

This work was supported in part by the National Key R&D Program of China (No. 2020YFB1807201), the National Natural Science Foundation of China (Nos. 61971027, U1834210, and 61961130391), the Beijing Natural Science Foundation (No. L202013), the Natural Science Foundation of Jiangsu Province, Major Project (No. BK20212002), the Royal Society Newton Advanced Fellowship (No. NA191006), the Frontiers Science Center for Smart High-speed Railway System, the Project of China Shenhua (No. GJNY-20-01-1), the Fundamental Research Funds for the Central Universities, China (No. 2020JBZD005), ZTE Corporation, and State Key Laboratory of Mobile Network and Mobile Multimedia Technology, and the UNSW Digital Grid Futures Institute, UNSW, Sydney, under a cross-disciplinary fund scheme and by the Australian Research Council’s Discovery Project (No. DP210102169).

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