STAR-RIS: Simultaneous Transmitting and Reflecting for Full-Space Coverage
Dr. Jiayi Zhang, Prof. Derrick Wing Kwan Ng
University of New South Wales
Abstract
We present the first comprehensive study of Simultaneous Transmitting And Reflecting RIS (STAR-RIS) for 6G full-space coverage. Unlike conventional RIS that only reflects signals, STAR-RIS serves users on both sides of the surface. We develop optimal beamforming algorithms for three STAR-RIS protocols (energy splitting, mode switching, time switching) and show that STAR-RIS improves sum-rate by 40-70% over conventional RIS in multi-user scenarios where users are distributed on both sides.
AI Summary
- First comprehensive study of STAR-RIS for 6G full-space coverage.
- Serves users on both sides of the intelligent surface simultaneously.
- 40-70% sum-rate improvement over conventional reflecting-only RIS.
- Optimal algorithms for three STAR-RIS operating protocols.
Key Findings
- 1Energy splitting protocol achieves the best performance in most scenarios.
- 2STAR-RIS is most beneficial when users are evenly distributed on both sides.
- 3The transmitting and reflecting coefficients are coupled, requiring joint optimization.
Industry Implications
STAR-RIS removes the half-space coverage limitation of conventional RIS.
Enables flexible RIS deployment on windows, partitions, and building walls.
Expands the applicability of RIS technology for 6G indoor-outdoor coverage.
Read the Original Paper
Access the full paper on arXiv for complete methodology, results, and references.
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