Chen, Z;
Tang, J;
Zhang, XY;
Wu, Q;
Chen, G;
Wong, KK;
(2023)
Robust Hybrid Beamforming Design for Multi-RIS Assisted MIMO System with Imperfect CSI.
IEEE Transactions on Wireless Communications
10.1109/TWC.2022.3222218.
(In press).
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Abstract
Reconfigurable intelligent surface (RIS) has been developed as a promising approach to enhance the performance of fifth-generation (5G) systems through intelligently reconfiguring the reflection elements. However, RIS-assisted beamforming design highly depends on the channel state information (CSI) and RIS’s location, which could have a significant impact on system performance. In this paper, the robust beamforming design is investigated for a RIS-assisted multiuser millimeter wave system with imperfect CSI, where the weighted sum-rate maximization problem (WSM) is formulated to jointly optimize transmit beamforming of the BS, RIS placement and reflect beamforming of the RIS. The considered WSM maximization problem includes CSI error, phase shifts matrices, transmit beamforming as well as RIS placement variables, which results in a complicated nonconvex problem. To handle this problem, the original problem is divided into a series of subproblems, where the location of RIS, transmit/reflect beamforming and CSI error are optimized iteratively. Then, a multiobjective evolutionary algorithm is introduced to gradient projection-based alternating optimization, which can alleviate the performance loss caused by the effect of imperfect CSI. Simulation results reveal that the proposed scheme can potentially enhance the performance of existing wireless communication, especially considering a desirable trade-off among beamforming gain, user priority and error factor.
| Type: | Article |
|---|---|
| Title: | Robust Hybrid Beamforming Design for Multi-RIS Assisted MIMO System with Imperfect CSI |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/TWC.2022.3222218 |
| Publisher version: | https://doi.org/10.1109/TWC.2022.3222218 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Array signal processing, Wireless communication, Optimization, MIMO communication, Hardware, Costs, Tuning |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10162449 |
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