电子学报2025，Vol.53Issue(12)：4364-4375,12.DOI:10.12263/DZXB.20250611
ARIS辅助的多天线DF中继协作MU-MISO系统的和速率分析与优化
Analysis and Optimization of the Sum Rate of ARIS-Assisted Multi-Antenna DF Relay Cooperative MU-MISO System
摘要
Abstract
The fundamental idea of relay cooperative technology is to enable single-antenna terminals to share their antennas through cooperation,forming a virtual multiple-input multiple-output(MIMO)system,which is an effective way to utilize spatial resources.Reconfigurable intelligent surface(RIS)technology leverages the flexible control capabilities of information metamaterials to directly manipulate the propagation direction of wireless electromagnetic waves.It can pro⁃vide additional transmission paths beyond direct line-of-sight,enabling full-duplex transmission without introducing self-in⁃terference,while offering advantages such as low hardware cost,low energy consumption,flexible configuration,and intelli⁃gent reconfiguration.Existing research indicates that RIS and traditional relay should not merely compete or replace one an⁃other.Despite their similar functions,they are fundamentally different,and there is a clear necessity and practical demand for coexistence and cooperation between them.Active reconfigurable intelligent surface(ARIS)technology,unlike tradi⁃tional passive RIS(PRIS),incorporates active components capable of amplifying or processing signals,thereby providing additional power control and signal processing capabilities.To meet the inherent demands of future 6G communication net⁃work such as ubiquitous connectivity,full-coverage networks,green and low-carbon operations,and inclusive intelligence as well as to increase the transmission rate and extend the coverage,considering the advantages of ARIS such as flexible beamforming and signal regulation capabilities,low overall power consumption,and cost relative controllability,along with merits of traditional relays such as the stability,reliability,and widespread deployment,a hybrid system combining ARIS and relay technology is investigated.The ARIS-assisted multi-antenna decode-and-forward(DF)relay cooperative multi-us⁃er multiple-input single-output(MU-MISO)system model is established,where the base station(BS)transmits information to multiple single-antenna users with the assistance of both half-duplex DF relays and ARIS.To maximize the sum rate,a joint optimization problem of the source transmit beamforming vector,relay transmit beamforming vector,relay receive beamforming vector,and ARIS active beamforming matrix is formulated.Due to the coupling of optimization variables and the presence of non-convex constraints,the original joint problem is non-convex and difficult to be solved directly.Alternat⁃ing optimization(AO)algorithm is utilized to decouple the original joint optimization problem into multiple subproblems,which are then converted into semi-definite programming(SDP)problems for solution via the sequential convex approxima⁃tion(SCA)method.Simulation results demonstrate that the proposed system significantly outperforms other existing bench⁃mark schemes.For example,when the number of ARIS elements is 20,the sum rate of the proposed system can be im⁃proved by 7.4%,11.2%,12.9%,8.4%compared with the benchmark schemes 1,2,3,4 respectively.关键词
ARIS/译码转发中继/MU-MISO/交替优化算法/和速率Key words
ARIS/decode-and-forward relay/MU-MISO/alternating optimization algorithm/sum rate分类
信息技术与安全科学引用本文复制引用
张顺外,崔博宇..ARIS辅助的多天线DF中继协作MU-MISO系统的和速率分析与优化[J].电子学报,2025,53(12):4364-4375,12.基金项目
江苏省高等学校自然科学研究项目(No.20KJB510034) （No.20KJB510034）
南京邮电大学校级自然科学基金(No.NY224129) Natural Science Foundation of Jiangsu Higher Education Institutions(No.20KJB510034) （No.NY224129）
Natural Science Foundation of Nanjing University of Posts and Telecommunications(No.NY224129) （No.NY224129）
