Reconfigurable Intelligent Surfaces Assisted Communications With Limited Phase Shifts: How Many Phase Shifts Are Enough?

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, whi...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2020-04, Vol.69 (4), p.4498-4502
Main Authors: Zhang, Hongliang, Di, Boya, Song, Lingyang, Han, Zhu
Format: Article
Language:English
Subjects:
Channel models
Communications systems
Degradation
Encoding
limited phase shifts
Manganese
performance analysis
Performance degradation
Performance evaluation
Reconfigurable intelligent surfaces
Reconfigurable intelligent surfaces assisted communications
Signal to noise ratio
Uplink
Wireless communication
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Summary: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.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2020.2973073