Design of hybrid field beamforming scheme for STAR-RIS-aided communication systems

A beamforming design scheme was proposed based on simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) communication systems. To address the hybrid near-far field challenges induced by extremely large-scale antenna arrays (ELAA), a hybrid channel model based on ar...

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Bibliographic Details
Published inTongxin Xuebao Vol. 46; pp. 109 - 118
Main Authors SHAO Kai, WANG Hongyu, WANG Guangyu
Format Journal Article
LanguageChinese
Published Editorial Department of Journal on Communications 01.07.2025
Subjects
beamforming
hybrid near-far field communication
hybrid non-orthogonal multiple access
STAR-RIS
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Summary:A beamforming design scheme was proposed based on simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) communication systems. To address the hybrid near-far field challenges induced by extremely large-scale antenna arrays (ELAA), a hybrid channel model based on array steering vectors was established first. Subsequently, a hybrid clustering strategy for far-near field users based on hybrid non-orthogonal multiple access (H-NOMA) and a serial interference cancellation (SIC) scheme at the receiving end were proposed to match far-near field users according to the channel strength from STAR-RIS to users. Through joint optimization of beamforming vectors and STAR-RIS phase shift matrices, a suboptimal solution was derived for the max-min total rate optimization problem. Simulation results demonstrate the superior performance of the proposed scheme in hybrid scenarios, where STAR-RIS and H-NOMA effectively enhance system performance. Compared with conventional passive RIS, orthogo
ISSN:1000-436X