A Study on Integrated Radar Communication Signal Based on OFDM Comb Spectrum

Currently, with the rapid development of mobile communications, wireless communication frequency bands are actively expanding and gradually overlapping with radar operating frequency bands, resulting in increasing communication interferences to radar systems. In order to efficiently utilize radar frequency bands for communication while avoiding conflicts with radar, radar-communication spectrum sharing technology has been widely researched and explored, with a focus on integrated radar communication signal. However, traditional integrated signals have limited degrees of freedom and cannot efficiently balance the performances of radar and communication. Therefore, the use of time-frequency domain subcarrier degrees of freedom is further expanded, and a integrated radar communication signal technology based on orthogonal frequency division multiplexing (OFDM) comb spectrum is proposed in this paper. To address the inherent distance ambiguity issue of OFDM comb spectrum signals, a time-frequency agile method is employed to obtain the apparent distance at multiple time-frequency scales, and a filtering-matching algorithm is applied to recover the true distance of the target. An excellent radar ambiguity function is offered by the proposed approach while wireless communication performance is maintained. Simulation results show that the proposed method ensures excellent radar detection performance and high-speed wireless communication capability.