合作式MIMO雷达通信一体化系统的检测与互信息增益

Target Detection and Mutual Information Improvement for Cooperative MIMO Radar-Communication Systems

本文研究合作式多输入多输出(Multiple-input multiple-output,MIMO)雷达通信一体化系统的性能,雷达系统和通信系统在共存的基础上相互合作。一方面,通信端将信息与雷达端共享,则源自雷达发射机和通信发射机的目标回波都被利用起来以完成雷达任务,一体化系统可等效为主被动混合式的MIMO雷达系统,有利于提高雷达方面的性能。另一方面,雷达端将信息与通信端共享,则在传统通信基础上,经雷达目标反射的通信信号也可被加以利用,完成通信任务,有利于提高通信方面的性能。本文以雷达目标检测概率和通信互信息为例,推导雷达系统和通信系统的性能,分析表明合作给MIMO雷达通信一体化系统中雷达端和通信端都带来了性能提升。进一步,针对功率有限的系统,讨论合作式MIMO一体化系统的功率分配问题,并仿真得到了最优的功率分配方式。

In this paper,a cooperative multiple-input multiple-output(MIMO)radar and communication systems is studied,where the two systems work cooperatively on the basis of coexistence.The knowledge of communication system is shared with the radar system,so that the communication signals can be accurately decoded at radar receivers.Then target returns contributed from both the radar transmitters and communication transmitters are employed to complete the radar task.The cooperative systems can be equivalent to a hybrid active-passive MIMO radar network,which helps to improve the radar performance.With the information shared by the radar system,the communication system can estimate the parameters of the radar target.Thus,the communication signals bounced off from the target are exploited to complete the communication task on the basis of the traditional communication,which helps to improve the communication performance.The target detection probability and mutual information are derived for the radar-communication systems,respectively.It is shown that there is a performance gain due to the cooperation between the radar and communication systems.Furthermore,the power resource assignment of the cooperative MIMO radar and communication systems with limited power is discussed,and the optimal power allocation is presented numerically.