基于FMCW的新型多域联合调制双功能雷达通信技术  

A new FMCW-based multi-domain joint modulation dual-function radar communication technology

作　　者：赵嘉荣 杨平[1] 肖悦[1] 武刚[1] 易琴 许向楠 Jiarong ZHAO;Ping YANG;Yue XIAO;Gang WU;Qin YI;Xiangnan XU(National Key Laboratory of Wireless Communications,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]电子科技大学通信抗干扰全国重点实验室,成都611731

出　　处：《中国科学：信息科学》2023年第9期1802-1821,共20页Scientia Sinica(Informationis)

基　　金：科技部国家重点研发计划(批准号:2020YFB1807203);中央高校基本科研业务费专项资金(批准号:2242022k60006);四川省面上基金(批准号:2023NSFSC0457)资助项目。

摘　　要：在频谱稀缺现状与6G万物互联需求形势之下,雷达通信一体化得以催生,引起了学术界广泛的关注和研究兴趣.一体化的相关技术研究中,如何在有限的硬件资源条件下平衡好通信与感知性能是一个难题.为解决这个问题,本文提出了一种基于多域联合传输的通感一体化系统方案,利用空域、频域、时域和能量域4种资源进行信息传输,可有效提高数据传输准确率,提升系统性能.构建的自适应偏移索引调频连续波雷达通信系统(offset FMCW-based radar-communications system,OFRaC),有效挖掘了偏移索引调制与原调频连续波雷达通信系统(FMCW-based radar-communications system,FRaC)的优势特性,减少了射频切换时间,提升了传输速率.为降低通信接收端的误比特率(bit error rate,BER),文中还提出了一种基于最短信道距离的天线选择OFRaC(antenna selection-based OFRaC,AOFRaC),可以在OFRaC基础上对BER性能做进一步改善.最后,通过仿真实验,本文分析了AOFRaC,OFRaC与原FRaC系统在通信和感知方面的性能变化,对比了所使用目标检测方法与传统方法的性能优点.得出的结论是,所提出的多域联合调制方案在通信与感知性能中能取得更好的折中与平衡,尤其在需要更轻负载的车联网、无人机等应用场景中,简易的雷达和通信接收端架构将给系统带来优势.In the context of spectrum scarcity and the need for the 6G Internet of everything,radar communication integration has been promoted and attracted extensive attention in the academic circle.In the related technology and research for integration,how to balance communication and perception performance in the condition of limited hardware resources is a challenge.To tackle this problem,a joint radar-communication system design framework based on multi-domain joint transmission is proposed in this paper,which can considerably improve the data transmission accuracy and system performance by utilizing resources of space,frequency,time and energy domains for information transmission.The constructed adaptive offset FMCW-based radar-communications system(OFRaC)effectively exploits the advantages of offset index modulation and original FMCW-based radar-communications system(FRaC),which can reduce the radio frequency(RF)chain switching time and improve the transmission rate.In order to reduce the transmission bit error rate(BER),an antenna selection OFRaC(AOFRaC)based on the shortest channel distance is proposed in this paper,which is capable of further improving the BER performance compared with OFRaC.Finally,through our simulation,the communication and sensing performance changes of AOFRaC,OFRaC and the original FRaC system are analyzed and benefits of the proposed target detection method compared to traditional methods are exploited.It is concluded that the proposed OFRaC scheme can achieve an attractive tradeoff between communication and perception performance,especially in the application scenarios requiring lighter loads,such as Internet of vehicles and unmanned aerial vehicle.In these scenarios,our simple radar and communication receiver architectures will bring many attractive advantages.

关 键 词：双功能雷达通信 多域联合调制 偏移空间调制 天线选择 压缩感知 

分 类 号：TN957.51[电子电信—信号与信息处理]