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Rate maximization for STAR-RIS-assisted SWIPT communication systems
Qian Du1, Yuhang Zhang2, Yaru Cui2
1School of Physics and Electronic Engineering, Linyi University, Linyi, 276000, China.
Scientific Reports
|June 26, 2026
Summary
This study optimizes simultaneously transmitting and reflecting reconfigurable intelligent surfaces (STAR-RIS) for wireless power and information transfer (SWIPT). STAR-RIS significantly enhances communication performance in SWIPT systems.
Area of Science:
- Wireless Communication Engineering
- Intelligent Reflecting Surfaces
- Signal Processing
Background:
- Simultaneous Wireless Information and Power Transfer (SWIPT) systems face challenges in optimizing both data rates and energy efficiency.
- Reconfigurable Intelligent Surfaces (RIS) offer a promising solution to control the wireless propagation environment.
- STAR-RIS uniquely enables simultaneous signal transmission and reflection, presenting new design opportunities for SWIPT.
Purpose of the Study:
- To investigate the optimal design of STAR-RIS-assisted SWIPT systems.
- To maximize the information transmission rate of the system through joint optimization.
- To leverage perfect channel state information for enhanced system performance.
Main Methods:
- Joint optimization of Access Point (AP) active beamforming and STAR-RIS phase shifts/amplitude coefficients.
- Decomposition of the original problem into two subproblems.
- Application of semidefinite relaxation, successive convex approximation, and penalty function methods.
- Iterative solution using a continuous alternating iteration method until convergence.
Main Results:
- The proposed optimization framework successfully maximizes the information transmission rate.
- STAR-RIS components (phase shifts and amplitude coefficients) are jointly optimized with AP beamforming.
- The iterative approach converges to an optimal solution for the complex design problem.
Conclusions:
- STAR-RIS technology can significantly improve the communication performance of SWIPT systems.
- Optimal design of STAR-RIS parameters is crucial for maximizing system efficiency.
- The developed optimization techniques provide an effective method for designing advanced wireless communication systems.
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