基于OFDM索引调制的海上通信感知一体化方法OA

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.