Design and Implementation of Integrated Sensing and Communication Waveform Based on LFM-CPM

The integrated waveform of sensing and communication is to overlap the sensing waveform and the communication waveform in the time and frequency domains, and respectively perform radar signal processing and communication signal processing at the receiving end. The integrated waveform obtained by superimposing the linear frequency modulated (LFM) signal and the continuous phase modulated (CPM) signal has the property of constant envelope, which can effectively avoid the signal distortion caused by the nonlinearity of the power amplifier, so it has better sensing performance and communication performance. In this paper, a new multi-segment frame structure design is proposed to solve the problem of spectral spreading of LFM-CPM waveforms, and comprehensively considers synchronization acquisition, the estimation and recovery of frequency offset and phase offset. In addition, we propose an efficient implementation of integrated waveforms based on FPGA, which can reduce resource consumption and improve quantization accuracy. Finally, we complete the designed integrated system on the hardware platform, and the experimental results show that the sensing and communication performances are outstanding.