STAR-RIS assisted multi-user wireless system beamforming design in TS mode

LIU Gang; LI Mingtai; PAN Cheng; GUO Yi; FU Shaozhong

doi:10.11959/j.issn.1000-0801.2024244

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STAR-RIS assisted multi-user wireless system beamforming design in TS mode

Research and Development | 更新时间：2025-03-17

- STAR-RIS assisted multi-user wireless system beamforming design in TS mode
- Telecommunications Science Vol. 40, Issue 11, Pages: 16-26(2024)
- 作者机构：
  
  西安电子科技大学空天地一体化综合业务网全国重点实验室，陕西西安 710068
- 作者简介：
- 基金信息：
  
  The National Natural Science Foundation of China(62171354);The Natural Science Basic Research Program of Shaanxi(2024JC-YBMS-533)
- DOI：10.11959/j.issn.1000-0801.2024244
  CLC： TN92
- Received：13 July 2024，
  
  Revised：17 October 2024，
  
  Published：20 November 2024
- 稿件说明：
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刘刚,李铭泰,潘澄等.TS模式下STAR-RIS辅助的多用户无线系统波束成形设计[J].电信科学,2024,40(11):16-26.

LIU Gang,LI Mingtai,PAN Cheng,et al.STAR-RIS assisted multi-user wireless system beamforming design in TS mode[J].Telecommunications Science,2024,40(11):16-26.
刘刚,李铭泰,潘澄等.TS模式下STAR-RIS辅助的多用户无线系统波束成形设计[J].电信科学,2024,40(11):16-26. DOI： 10.11959/j.issn.1000-0801.2024244.

LIU Gang,LI Mingtai,PAN Cheng,et al.STAR-RIS assisted multi-user wireless system beamforming design in TS mode[J].Telecommunications Science,2024,40(11):16-26. DOI： 10.11959/j.issn.1000-0801.2024244.

摘要

同时透射与反射可重构智能表面（simultaneously transmitting and reflecting reconfigurable intelligent surface，STAR-RIS）具有同时透射与反射的特性，能够将传统RIS（conventional RIS，CRIS）的通信能力从半空间扩展至全空间。针对STAR-RIS辅助下的多用户多输入单输出（multiple-input single-output，MISO）通信系统，提出了一种基于时间切换（time switch，TS）模式的波束成形算法，以实现发射功率最小化。该算法首先通过最大比传输（maximum ratio transmission，MRT）得到基站初始发射波束，然后利用TS时隙正交性和信道增益最大化（channel gain maximum，CGM）将非凸优化问题解耦为恒模非凸问题和半正定规划（semi-definite programming，SDP）问题，最后利用流形优化与内点法联合求解。仿真结果表明，STAR-RIS相比CRIS可以有效降低发射功率；所提算法在相同信干噪比下，比主流算法具有更低的发射功率；TS模式在低信干噪比下相较于能量分裂（energy split，ES）模式具有更低的发射功率。

Abstract

Simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) has the capability of simultaneous transmission and reflection

extending the communication capacity of conventional RIS (CRIS) from half-space to full-space. For the multi-user multiple-input single-output (MISO) communication system assisted by STAR-RIS

a beamforming algorithm based on time switch (TS) mode was proposed to minimize transmission power. Firstly

maximum ratio transmission (MRT) was used to get the initial BS transmitting beamforming. Secondly

TS slot orthogonality and channel gain maximum (CGM) were used to decouple the non-convex problem into the constant mode non-convex problem and the semi-definite programming (SDP) problem. Finally

manifold optimization and interior point method were used to jointly solve these problems. The simulation results show that

STAR-RIS can effectively reduce the transmission power compared with conventional RIS. Under the same SINR（signal-to-noise ratio）. The proposed algorithm has lower transmitting power than the mainstream algorithm. TS mode has lower transmitting power than energy splitting (ES) mode at low SINR.

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references

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