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arXiv · 2208.01942

Coupled Phase-Shift STAR-RISs: A General Optimization Framework

Zhaolin Wang·Xidong Mu·Yuanwei Liu·Robert Schober
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Abstract

A general optimization framework is proposed for simultaneously transmitting and reflecting reconfigurable surfaces (STAR-RISs) with coupled phase shifts, which converges to the Karush-Kuhn-Tucker (KKT) optimal solution under some mild conditions. More particularly, the amplitude and phase-shift coefficients of STAR-RISs are optimized alternatively in closed form. To demonstrate the effectiveness of the proposed optimization framework, the throughput maximization problem is considered in a case study. It is rigorously proved that the KKT optimal solution is obtained. Numerical results confirm the effectiveness of the proposed optimization framework compared to baseline schemes.

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Zhaolin Wang, Xidong Mu, Yuanwei Liu, Robert Schober. 2022-11-30. Coupled Phase-Shift STAR-RISs: A General Optimization Framework. https://doi.org/10.1109/lwc.2022.3219020

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