Joint Location and Beamforming Design for STAR-RIS Assisted NOMA Systems
نویسندگان
چکیده
Simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) assisted non-orthogonal multiple access (NOMA) communication systems are investigated in its vicinity, where a STAR-RIS is deployed within predefined region for establishing links users. Both beamformer-based NOMA cluster-based schemes employed at the multi-antenna base station (BS). For each scheme, deployment location, passive beamforming (BF) of STAR-RIS, active BF BS jointly optimized maximizing weighted sum-rate (WSR) To solve resultant non-convex problems, an alternating optimization (AO) algorithm proposed, successive convex approximation (SCA) semi-definite programming (SDP) methods invoked iteratively addressing non-convexity sub-problem. Numerical results reveal that 1) WSR performance can be significantly enhanced by optimizing specific location STAR-RIS; 2) both prefer asymmetric deployment.
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ژورنال
عنوان ژورنال: IEEE Transactions on Communications
سال: 2023
ISSN: ['1558-0857', '0090-6778']
DOI: https://doi.org/10.1109/tcomm.2023.3247753