Journal
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume 69, Issue 4, Pages 4498-4502Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2020.2973073
Keywords
Reconfigurable intelligent surfaces assisted communications; limited phase shifts; performance analysis
Categories
Funding
- National Natural Science Foundation of China [61625101, 61829101, 61941101]
- US Multidisciplinary research program of the University Research Initiative Air Force Office of Scientific Research MURI [18RT0073]
- National Science Foundation [EARS-1839818, CNS1717454, CNS-1731424, CNS-1702850, CNS-1646607]
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Reconfigurable intelligent surface (RIS) has drawn a great attention worldwide as it can create favorable propagation conditions by controlling the phase shifts of the reflected signals at the surface to enhance the communication quality. However, the practical RIS only has limited phase shifts, which will lead to the performance degradation. In this paper, we evaluate the performance of an uplink RIS assisted communication system by giving an approximation of the achievable data rate, and investigate the effect of limited phase shifts on the data rate. In particular, we derive the required number of phase shifts under a data rate degradation constraint. Numerical results verify our analysis.
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