智能反射面辅助雷达通信双功能系统的多载波波形优化方法

Multicarrier Waveform Optimization Method for an Intelligent Reflecting Surface-assisted Dual-function Radar-communication System

雷达通信一体化是解决频谱资源拥挤问题的有效途径之一,而共享波形设计是同时实现雷达与通信功能的关键技术,该文旨在解决智能反射面(IRS)辅助雷达通信双功能(DRC)系统的多载波波形优化问题。首先,通过最大化传输功率、通信码字错误率(WEP)、旁瓣幅度与IRS反射系数约束下的雷达互信息(RMI),构建了双功能发射波形、IRS反射单元、雷达与通信接收波束联合优化模型。其次,提出了基于交替方向最大化(ADM)的多载波波形优化算法,通过将原非凸优化问题分解为若干低复杂度子问题并迭代优化,获得了多载波波形功率分配策略的局部最优解。最后,仿真结果表明,ADM算法能同时实现雷达与通信功能;相较于现有方法有效提升了IRS辅助DRC系统的雷达与通信性能。

Radar-communication integration is an effective way to solve the congestion problem of spectrum resource.Sharing waveform design is the key technology that realizes the radar and communication functions simultaneously.This study solves the multicarrier waveform optimization problem for an Intelligent Reflecting Surface(IRS)-assisted Dual-function Radar-Communication(DRC)system.First,by maximizing Radar Mutual Information(RMI)along with the constraints of transmission power,Word Error Probability(WEP),sidelobe amplitude and IRS reflection coefficient,a joint optimization model with dual-functional transmit waveform,IRS reflecting units,radar and communication receiving beampattern is constructed.Second,a multicarrier waveform optimization algorithm based on Alternating Direction Maximization(ADM)is proposed.The original non-convex optimization problem is decomposed into several low-complexity subproblems and then iteratively optimized to obtain the local power allocation strategy of the multicarrier waveform.Finally,the simulation results show that the radar and communication functions can be simultaneously realized using the ADM algorithm.For the IRS-assisted DRC system,both the radar and communication performances can be effectively improved compared with those of the existing methods.