Reconfigurable Intelligent Surface Assisted Two–Way Communications: Performance Analysis and Optimization
Saman Atapattu, Rongfei Fan, Prathapasinghe Dharmawansa, Gongpu Wang, Jamie Evans, Theodoros A Tsiftsis
IEEE Transactions on Communications | Institute of Electrical and Electronics Engineers (IEEE) | Published : 2020
In this paper, we investigate the two-way communication between two users assisted by a reconfigurable intelligent surface (RIS). The scheme that two users communicate simultaneously over Rayleigh fading channels is considered. The channels between the two users and RIS can either be reciprocal or non-reciprocal. For reciprocal channels, we determine the optimal phases at the RIS to maximize the signal-to-interference-plus-noise ratio (SINR). We then derive exact closed-form expressions for the outage probability and spectral efficiency for single-element RIS. By capitalizing the insights obtained from the single-element analysis, we introduce a gamma approximation to model the product of Ra..View full abstract
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Awarded by Australian Research Council (ARC)
Awarded by Natural Science Foundation of China (NSFC)
The work of S. Atapattu and J. Evans was supported in part by the Australian Research Council (ARC) through the Discovery Project Grant DP180101205. The work of G. Wang was supported in part by the Natural Science Foundation of China (NSFC, 61871026, and U1834210). This article was presented in part at the IEEE Wireless Communications and Networking Conference (WCNC) 2020.