Low-Cost Passive Beamforming for RIS-Aided Wideband OFDM Systems

Reconfigurable intelligent surface (RIS) has become a promising solution to improve the performance of future wireless systems with low energy consumptions. Concerning a RIS-aided orthogonal frequency division multiplexing (OFDM) system, we perform optimization with respect to the RIS passive beamfo...

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Bibliographic Details
Published in:IEEE wireless communications letters 2022-02, Vol.11 (2), p.318-322
Main Authors: He, Zhenyao, Shen, Hong, Xu, Wei, Zhao, Chunming
Format: Article
Language:English
Subjects:
Approximation
Array signal processing
Beamforming
Computational complexity
Convergence
Iterative methods
majorization-minimization (MM)
OFDM
Optimization
Orthogonal Frequency Division Multiplexing
orthogonal frequency division multiplexing (OFDM)
passive beamforming optimization
Performance enhancement
Reconfigurable intelligent surface (RIS)
Simulation
Upper bound
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Summary:Reconfigurable intelligent surface (RIS) has become a promising solution to improve the performance of future wireless systems with low energy consumptions. Concerning a RIS-aided orthogonal frequency division multiplexing (OFDM) system, we perform optimization with respect to the RIS passive beamforming such that the sum rate over all subcarriers is maximized. Different from an existing successive convex approximation (SCA) method, we propose a majorization-minimization (MM)-based iterative approach to optimize the RIS passive beamforming, where a closed-form solution is obtained in each iteration. Simulation results show that the proposed RIS passive beamforming achieves almost the same performance as the SCA-based method while with much lower computational complexity.
ISSN:2162-2337
2162-2345
DOI:10.1109/LWC.2021.3126852