Waveform Design for Integrated Sensing and Communication Systems Based on Interference Exploitation  

作　　者：Tian Liu Yinghong Guo Lingfeng Lu Bin Xia 

机构地区：[1]Southwest China Institute of Electronic Technology,Chengdu 610036,China [2]Institute of Wireless Communications Technology(IWCT)and Shanghai Key Laboratory of Digital Media Processing and Transmission,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Communications and Information Networks》2022年第4期447-456,共10页通信与信息网络学报（英文）

基　　金：This work is supported in part by Shanghai Municipal Science and Technology Major Project under Grant 2021SHZDZX0102.

摘　　要：Integrated sensing and communication(ISAC)is a spectrum and energy efficient approach to realizing dual functions by a unified hardware platform.In this paper,we consider a multiple-input multiple-output(MIMO)ISAC system,where the transmitted waveform consisting of communication signals and dedicated sensing signal is optimized for dual purposes of estimating targets and serving downlink single-antenna users.Specifically,the sensing interference and multi-user interference are exploited,rather than suppressed,by the waveform design scheme.The joint waveform design problem is formulated by maximizing the constructive interference(CI)while ensuring the power budget and waveform similarity error with the benchmark signal,which limits the sensing estimation accuracy.To obtain the benchmark signal which achieves the optimal estimation performance,we propose a semidefinite relaxation based algorithm to solve the optimization problem.For clarity,we derive the real representation of the complex joint waveform design problem and prove its convexity.Numerical results verify the superiority of the proposed CI-based waveform design when the interference was efficiently exploited as a useful signal source achieving favorable symbol error ratio performance.Moreover,the dedicated sensing signal provides more degree of freedom for waveform design.

关 键 词：ISAC CI waveform design Cramer-Rao bound 

分 类 号：TN92[电子电信—通信与信息系统]