Power-Efficient STAR-RIS Aided MIMO-SWIPT Towards 6G Green Communications Under Channel Estimation Error

Globecom, pp. 4405–4410

Abstract

In this paper, we explore a novel approach of using a simultaneous transmission and reflection reconfigurable intelligent surface (STAR-RIS) to aid a multi-user (MU) multi-input multi-output (MIMO) system for simultaneous wireless information and power transfer (SWIPT) in the presence of statistical channel estimation errors (CEE). Our focus is on minimizing the power required for the SWIPT system through joint beamforming design at both the base station (BS) and STAR-RIS, while ensuring that the minimum rate and minimum energy harvesting requirements are met for information and energy receivers, respectively. Due to the non-convex and NP-hard nature of the problem, we utilize a minimum mean square error (MMSE) approach to simplify the problem and then use an alternating optimization framework to solve the beamforming design problems at the BS and STAR-RIS iteratively using general approximations. Simulation results show that the proposed algorithm provides a significant beamforming gain for STAR-RIS-aided SWIPT system over conventional RIS system while satisfying the given quality of service (QoS) constraints for SWIPT systems under the CEE.

Authors 6

1. Jetti Yaswanth

   National Sun Yat-sen University

   Affiliation as printed

   Institute of Communications Engineering, National Sun Yat-sen University,Kaohsiung,Taiwan,804

2. Mayur Vitthalrao Katwe

   Southeast University

   Affiliation as printed

   Southeast University,National Mobile Communications Research Laboratory,Nanjing,China,210096

3. Keshav Kumar Singh

   National Sun Yat-sen University

   Affiliation as printed

   Institute of Communications Engineering, National Sun Yat-sen University,Kaohsiung,Taiwan,804

4. Omid Taghizadeh
   Affiliation as printed

   Lenovo Deutschland GmbH,5G Wireless Research Group,Germany

   5G Wireless Research Group, Lenovo Deutschland GmbH, Germany

5. Cunhua Pan

   Southeast University

   Affiliation as printed

   Southeast University,National Mobile Communications Research Laboratory,Nanjing,China,210096

6. Anke Schmeink Aachen Chair of Information Theory and Data Analytics

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University,Chair of Information Theory and Data Analytics,Aachen,Germany,52062