Journal article

Is backscatter link stronger than direct link in reconfigurable intelligent surface-assisted system?

W Zhao, G Wang, S Atapattu, TA Tsiftsis, C Tellambura

IEEE Communications Letters | IEEE | Published : 2020

Abstract

This letter considers integrating a backscatter link with a reconfigurable intelligent surface to enhance backscatter communication while assisting the direct communication. We derive the probability that the backscatter channel dominates in the composite channel. This probability is a useful performance measure to determine the number of reflectors. Since the exact probability lacks a closed-form solution, we develop two approximations by modeling the gain of the backscatter link with a Gaussian or Gamma distribution. We found that these approximations match well with the exact value. Importantly, with a well-designed number of reflectors, the channel gain of the backscatter link may be alw..

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Grants

Awarded by Australian Research Council


Funding Acknowledgements

This study is supported in part by Key Laboratory of Universal Wireless Communications (BUPT), Ministry of Education, P.R. China under Grant KFKT-2018104, in part by the Natural Science Foundation of China (NSFC) under Grants 61571037, 61871026 and U1834210, in part by NFSC Outstanding Youth under Grant 61725101, and in part by the Australian Research Council (ARC) through the Discovery Early Career Researcher (DECRA) Award under Grant DE160100020.