Reconfigurable Intelligent Surface Assisted OFDM Relaying: Subcarrier Matching With Balanced SNR

Tong Zhang1; Shuai Wang2; Yufan Zhuang1; Changsheng You1; Miaowen Wen3; Yik-Chung Wu4

2022

10.1109/TVT.2022.3213368

IEEE Transactions on Vehicular Technology   Impact Factor & Quartile

1939-9359

1939-9359

This paper considers a reconfigurable intelligent surface (RIS) aided orthogonal frequency division multiplexing (OFDM) relaying system, and investigates the joint design of RIS passive beamforming and subcarrier matching under two cases, where Case-I ignores the source-RIS-destination signal, while Case-II explores this signal for rate enhancement. We formulate a mixed-integer nonlinear programming (MINIP) problem to maximize the sum achievable rate of all subcarriers by jointly optimizing the passive beamforming and subcarrier matching. To solve this problem, we first develop a branch-and-bound (BnB)-based alternating optimization algorithm for attaining a near-optimal solution. Then, a low-complexity difference-of-convex penalty-based algorithm and learning-to-optimize approach are also proposed. Finally, simulation results demonstrate that the RIS-assisted OFDM relaying system achieves a substantial achievable rate gain as compared to that without RIS since RIS recasts the subcarrier matching and balances the signal-to-noise ratio (SNR) among different subcarrier pairs.

Decode-and-forward relay OFDM passive beamforming RIS subcarrier matching

SCI

English

First

National Natural Science Foundation of China["61871190","62001203","62201242"] ; Guangdong Basic and Applied Basic Research Foundation[2021B1515120067]

Engineering ; Telecommunications ; Transportation

Engineering, Electrical & Electronic ; Telecommunications ; Transportation Science & Technology

WOS:000944202400062

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

IEEE

1.Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, China
2.Guangdong-Hong Kong-Macao Joint Laboratory of Human-Machine Intelligence-Synergy Systems, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
3.School of Electronic and Information Engineering, South China University of Technology, Guangzhou, China
4.Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong

Tong Zhang,Shuai Wang,Yufan Zhuang,et al. Reconfigurable Intelligent Surface Assisted OFDM Relaying: Subcarrier Matching With Balanced SNR[J]. IEEE Transactions on Vehicular Technology,2022,PP(99):1-15.

Tong Zhang,Shuai Wang,Yufan Zhuang,Changsheng You,Miaowen Wen,&Yik-Chung Wu.(2022).Reconfigurable Intelligent Surface Assisted OFDM Relaying: Subcarrier Matching With Balanced SNR.IEEE Transactions on Vehicular Technology,PP(99),1-15.

Tong Zhang,et al."Reconfigurable Intelligent Surface Assisted OFDM Relaying: Subcarrier Matching With Balanced SNR".IEEE Transactions on Vehicular Technology PP.99(2022):1-15.