有源可重构网络中的联合波束优化与功率控制

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关键词：可重构智能表面；乘性衰落；加权和速率；波束赋形

中图分类号：TN929.5 文献标志码：A 文章编号：1001-3695（2025）12-027-3737-07

doi：10.19734/j.issn.1001-3695.2025.05.0164

Beamforming and power control for active RIS-enabled networks

Lei Fang，Chen Chuanyang†，Hu Xin （ScholofComcasdIfoatioErin，oinUestofostsdTelecuicatis，oging）

Abstract：To mitigatethesevere path losscaused bymultiplicative fading in passve RIS-assisted systems，this paper proposedalow-complexity，energy-effcientjointoptimization scheme formulti-usercommunications withactive RIS.The scheme aimed to maximizethe weighted sumrate（WSR）undertransmit power constraints atboth thebase stationandtheRIS.Byleveragingfractionalprogramming（FP），theoriginalnon-convexproblemwastransformedintoaseriesof tractablesubproblems.Ablock coordinate descent（BCD）framework solved these subproblems by alternatelyoptimizing the BSbeamforming and RISreflectionmatrices.Toupdate theRIS reflectionmatrix，thealgorithmadoptedamajorization-minimization（MM）aproach to constructa closed-form surrogate lower bound，simplifyingtheoptimization processto matrix-vectormultiplications andprojectionoperations.Compared to CVX-based methods，，the proposed algorithmreducedthecomputationalcomplexityby approximately O（N1.5） and outperformed binary search methods in convergence and performance at similar complexity.Simulation results show that the proposed scheme improves WSR by 27.67% at 15dBm ，and achieves similar performance with only 5 dBm，reducing energy consumption by about 10dB ，making it well suited for rapid deployment in large-scale RIS systems.

Key words：reconfigurable intellgent surface（RIS）；multiplicative fading；weighted sum-rate;beamforming design

0 引言

随着第六代移动通信技术（6th-Generation，6G）研究的持续推进，移动通信系统在数据速率、网络容量、覆盖范围和时延等关键性能指标上提出了更为严苛的要求。（剩余15752字）