基于动态超表面天线的雷达通信一体化设计  

Beamforming Design for Dual-functional Radar-communication Systems with Dynamic Metasurface Antennas

作　　者：高克 张海洋[1] 王保云[1] GAO Ke;ZHANG Haiyang;WANG Baoyun(Communication and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《无线电通信技术》2023年第5期946-952,共7页Radio Communications Technology

摘　　要：雷达通信一体化(Dual-Functional Radar-Communication,DFRC)利用相同的硬件平台、频谱资源同时实现雷达感知和无线通信双功能,是当前无线通信领域研究的热点技术。针对动态超表面天线(Dynamic Metasurface Antenna,DMA)辅助的雷达通信一体化系统,研究了最优波束成形设计问题。最优波束成形设计是一个非凸优化问题,很难直接求解。设计全数字天线架构下的最优波束,将动态超表面天线雷达波束设计转换为拟合最优编码矩阵问题。转换后的波束设计问题仍为非凸,为此将其分解为两个子问题交替最小化,其中两个子问题分别采用黎曼共轭梯度和半正定松弛算法求解。数值仿真表明,满足通信质量约束的情况下,动态超表面天线架构的DFRC雷达波束性能接近于无频谱共享时的纯雷达波束性能。Dual-Functional Radar-Communication(DFRC) uses same hardware platform and spectrum re-sources to realize dual functions of radar detection and wireless communication simultaneously,which is a hot topic in the field of wireless communications.For the Dynamic Metasurface Antennas(DMA)-assisted DFRC system,an optimal beamforming design problem is studied.The optimal beamforming design is a non-convex optimization problem that is difficult to solve directly.In this paper,an optimal beam with a digital antenna architecture is designed first,and then the dynamic metamaterial antenna radar beam design is converted into a fitting optimal coding matrix problem.Though the resulting design problem is still non-convex.it can be decom-posed into two sub-problems and then been solved alternately.In particular,the two sub-problems are solved by riemannian conjugate gradient and semidefinite relaxation algorithms,respectively.Finally,numerical results show that the performance of our proposed beamforming design for DMA-assisted DFRC system is close to that of the radar only beamforming without communication requirement.

关 键 词：雷达通信一体化 动态超表面天线 交替最小化 黎曼共轭梯度 半正定松弛 

分 类 号：TN929.5[电子电信—通信与信息系统]