Design of Dual-Function Radar Communication System Based on Delayed Jump Mapping LFM

The deterioration of dual-function performance and increased complexity of communication receivers challenge the efficiency of dual-functional radar-communication (DFRC) system based on linear frequency modulation (LFM). This paper designs a delayed jump mapping LFM (DJM-LFM) waveform-based DFRC system. The frequency delay jumps are generated at the specific points in the LFM cycle to modulate data. After carrier mixing and undersampling, the communication receiver realizes dechirp in the digital domain, to reduce the performance requirements of the coherent signal generation and sampling. In the radar processing link, we propose the breakpoint area deletion and concatenation (BADC) scheme, making the radar performance of DFRC consistent with that of unmodulated frequency modulated continuous wave radar (FMCW). The simulation results show that, compared with the scheme without compensation, the BADC scheme reduces the sidelobe amplitude of the range domain profile by about 38 dB. DJM-LFM reduces the symbol error rate of 2 dB compared with existing DFRC schemes based on the LFM waveform.