Fair Beam Allocations Through Reconfigurable Intelligent Surfaces

A fair beam allocation framework through reconfigurable intelligent surfaces (RISs) is proposed, incorporating the Max-min criterion. This framework focuses on designing explicit beamforming functionalities through optimization. Firstly, realistic models, grounded in geometrical optics, are introduc...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 2024-11, Vol.42 (11), p.3095-3109
Main Authors: Xiong, Rujing, Yin, Ke, Mi, Tiebin, Lu, Jialong, Wan, Kai, Qiu, Robert Caiming
Format: Article
Language:English
Subjects:
Antenna arrays
Approximation algorithms
Array signal processing
beam-splitting
fair beam allocation
max-min optimization
Minimax techniques
Moreau-Yosida approximation
Optimization
prototype experiment
Reconfigurable intelligent surface (RIS)
Reconfigurable intelligent surfaces
Resource management
wide-beam generation
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Summary:A fair beam allocation framework through reconfigurable intelligent surfaces (RISs) is proposed, incorporating the Max-min criterion. This framework focuses on designing explicit beamforming functionalities through optimization. Firstly, realistic models, grounded in geometrical optics, are introduced to characterize the input/output behaviors of RISs, effectively bridging the gap between the requirements on explicit beamforming operations and their practical implementations. Then, a highly efficient algorithm is developed for Max-min optimizations involving quadratic forms. Leveraging the Moreau-Yosida approximation, we successfully reformulate the original problem and propose an iterative algorithm to obtain the optimal solution. A comprehensive analysis of the algorithm's convergence is provided. Importantly, this approach exhibits excellent extensibility, making it readily applicable to address a broader class of Max-min optimization problems. Finally, numerical and prototype experiments are conducted to validate the effectiveness of the framework. With the proposed beam allocation framework and algorithm, we clarify that several crucial redistribution functionalities of RISs, such as explicit beam-splitting, fair beam allocation, and wide-beam generation, can be effectively implemented. These explicit beamforming functionalities have not been thoroughly examined previously.
ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2024.3431580