Data Rate Maximization in RIS-Assisted D2D Communication with Transceiver Hardware Impairments

Hongxia Zheng,Chunlong He,Xingquan Li,Chiya Zhang,Yatao Yang

doi:10.3390/electronics11020200

Abstract

We maximize the transmit rate of device-to-device (D2D) in a reconfigurable intelligent surface (RIS) assisted D2D communication system by satisfying the unit-modulus constraints of reflectin elements, the transmit power limit of base station (BS) and the transmitter in a D2D pair. Since it is a non-convex optimization problem, the block coordinate descent (BCD) technique is adopted to decouple this problem into three subproblems. Then, the non-convex subproblems are approximated into convex problems by using successive convex approximation (SCA) and penalty convex-concave procedure (CCP) techniques. Finally, the optimal solution of original problem is obtained by iteratively optimizing the subproblems. Simulation results reveal the validity of the algorithm that we proposed to solve the optimization problem and illustrate the effectiveness of RIS to improve the transmit rate of the D2D pair even with hardware impairments.

Highlights

Device-to-device (D2D) communication has already been taken as a potential paradigm to support proximity-based applications [1]
We investigate an reconfigurable intelligent surface (RIS)-assisted D2D wireless communication system, which is composed of one base station (BS), one RIS, one user equipment (UE) and a D2D pair that is made up of a D2D-transmitting UE (DTUE) and a D2D-receiving UE (DRUE)
We illustrate the influence of the hardware impairments and the benefits of the proposed algorithm via numerical simulations

Summary

Introduction

Device-to-device (D2D) communication has already been taken as a potential paradigm to support proximity-based applications [1]. By using D2D communication technique, proximity users in communication system can exchange information with each other without access to the base station (BS). It can reuse the spectrum of conventional cellular user to improve the spectral efficiency (SE) of communication systems by carefully suppressing interference [2,3]. Authors in [4,5] investigated power-saving D2D communication based on WiFi interface. The resource allocation about unlicensed based D2D communication was discussed in [6,7]

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Conclusion