通信学报2025，Vol.46Issue(6)：101-114,14.DOI:10.11959/j.issn.1000-436x.2025098
流体天线辅助的ISAC系统通感动态加权联合波束成形设计
Dynamic-weighted joint beamforming design for communication and sensing in fluid antenna-assisted ISAC system
摘要
Abstract
To address the challenges in achieving dynamic communication-sensing trade-offs and the high complexity of conventional optimization methods in existing fluid antenna(FA)-assisted integrated sensing and communication(ISAC)systems,a weighted joint optimization scheme for FA-assisted ISAC beamforming was proposed.Firstly,a weighted sum maximization model of communication sum-rate and sensing beam pattern gain was established.The communica-tion rate maximization problem was transformed into a weighted minimum mean square error(WMMSE)minimization formulation,with joint optimization of the beamforming matrix and transceiver antenna positions under transmit power constraints.Then,for the non-convex optimization problem involving beamforming matrices and FA positions,an alter-nating optimization algorithm was employed to decompose it into beamforming and position optimization subproblems.Convex relaxations were constructed by integrating Taylor expansion and the majorization-minimization(MM)algo-rithm,and closed-form solutions were derived.The simulation results demonstrate that the proposed scheme significantly outperforms traditional ISAC systems in both total communication rate and beam pattern gain.Furthermore,flexible trade-offs between communication and sensing performance are achieved by adjusting weight parameters.关键词
流体天线/通感一体化/波束成形/联合优化/加权最小均方误差Key words
fluid antenna/ISAC/beamforming/joint optimization/WMMSE分类
信息技术与安全科学引用本文复制引用
李飞,张杰,李汀,宋云超..流体天线辅助的ISAC系统通感动态加权联合波束成形设计[J].通信学报,2025,46(6):101-114,14.基金项目
国家自然科学基金资助项目(No.62271265,No.62371249) The National Natural Science Foundation of China(No.62271265,No.62371249) （No.62271265,No.62371249）
