基于OFDM索引调制的海上通信感知一体化方法  

Integrated Sensing and Communication Method for Maritime Environments Based on OFDM-IM

作　　者：吴小鹏 张若愚 王晶琦[1] 缪晨[1] 马越[1] WU Xiaopeng;ZHANG Ruoyu;WANG Jingqi;MIAO Chen;MA Yue(Key Laboratory of Near-Range RF Sensing ICs&Microsystems,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学近程射频感知芯片与微系统教育部重点实验室,江苏南京210094

出　　处：《移动通信》2024年第11期63-69,共7页Mobile Communications

基　　金：国家自然科学基金项目“基于多维稀疏的大规模MIMO通信感知一体化信道与目标参数估计研究”,“基于谐波多维特征的时间调制阵列宽带信号处理方法研究”(62201266,62301254);江苏省自然科学基金“面向车联网通信雷达一体化系统研究”。

摘　　要：通信感知一体化(ISAC)技术因其同时具备信息传输和目标探测功能,未来将成为海上无人平台协同作业的关键。为解决海洋通信感知一体化系统通信效率低、感知复杂度高等挑战,提出了一种基于正交频分复用索引调制(OFDM-IM)的ISAC方法。该方法通过在发射端选择性激活子载波来提高一体化信号的频谱效率并降低系统能耗,在通信接收端使用对数似然比检测方法,对子载波索引所携带的信息进行解调。在感知接收端,提取激活子载波的回波信息,接着在分布式压缩感知的框架内对目标的目标距离进行估计,最后根据距离估计的支撑集提取对应的回波信号,从而实现目标速度估计。仿真结果表明,该方法能够有效实现高可靠的通信解调,以及目标距离和速度的低复杂度准确估计。Integrated sensing and communication(ISAC)technology,capable of simultaneously enabling data transmission and target detection,is poised to become essential for the coordinated operation of maritime unmanned platforms.To address the challenges of low communication efficiency and high sensing complexity in maritime ISAC systems,this study proposes an ISAC approach based on orthogonal frequency division multiplexing with index modulation(OFDM-IM).The method selectively activates subcarriers at the transmitter to enhance spectral efficiency and reduce energy consumption.At the communication receiver,log-likelihood ratio detection is employed to demodulate the information embedded in the subcarrier indices.On the sensing side,echo signals from activated subcarriers are extracted to estimate target range under a distributed compressed sensing framework.Subsequently,the corresponding echo signals are processed to estimate target velocity based on the support set of the range estimates.Simulation results demonstrate that the proposed method achieves reliable communication demodulation and accurate,low-complexity target range and velocity estimation.

关 键 词：海洋通信 通信感知一体化 正交频分复用 索引调制 分布式压缩感知 

分 类 号：TN929.5[电子电信—通信与信息系统]