南京邮电大学学报（自然科学版）2025，Vol.45Issue(2)：1-12,12.DOI:10.14132/j.cnki.1673-5439.2025.02.001
双IRS辅助的低空复杂场景通感一体化联合波束成形与反射设计
Design of the double-IRS-assisted ISAC system joint beamforming and reflection for low altitude complex scenes
摘要
Abstract
The intelligent reflecting surface(IRS)assisted integrated sensing and communication(ISAC)system can expand the signal coverage and improve the communication and sensing performance.It has become one of the key technologies of 6G communication.However,in the low-altitude complex scenes,single IRS-assisted ISAC systems struggle with pathloss and occlusion due to user and target mov-ing,leading to degraded signal transmission quality.In regard of this,this paper proposes an optimiza-tion scheme that jointly integrates beamforming and reflection with double-IRS-assisted ISAC.First,the optimization model of the double-IRS-assisted ISAC system is established.Under the constraints of base station transmission power and sensing performance,the integrated transmission beamforming of base sta-tions and the reflection coefficient matrix of the double IRSs are jointly optimized to maximize the achiev-able rate of communication users.Second,the fractional programming(FP)method is used to decouple the joint optimization problem into two sub-problems:integrated beamforming and double IRS phase shift optimization.Thus the computational complexity can be reduced.Based on the second-order cone pro-gramming(SOCP),a common-sense beamforming scheme is designed.Since the coupling of double IRSs can increase the complexity of the IRS reflection design,the successive convex approximation(SCA)and the alternative direction method of multipliers(ADMM)are employed,and the optimal reflection phase shift of double IRS is obtained by the alternating optimization.Third,an alternating optimization(AO)method for IRS reflection phase shift and communication-and-sensing-joint beamforming is de-signed to improve the overall performance of the system.The simulation results show that the proposed scheme has good convergence and effectiveness,and the double-IRS-assisted ISAC scheme can signifi-cantly improve the performance of low altitude complex communication and sensing systems.关键词
智能反射面/通感一体化/波束成形/非凸优化问题Key words
intelligent reflecting surface(IRS)/integrated sensing and communication(ISAC)/beam-forming/non-convex optimization分类
电子信息工程引用本文复制引用
李飞,王媛媛,李汀,熊承寅,刘愚成..双IRS辅助的低空复杂场景通感一体化联合波束成形与反射设计[J].南京邮电大学学报（自然科学版）,2025,45(2):1-12,12.基金项目
国家自然科学基金(62271265)资助项目 （62271265）
