Method for suppressing range sidelobes of bistatic integrated sensing and communication signal based on LFM

Integrated sensing and communication (ISAC) technology aims to alleviate the conflict between communication systems and radar systems over frequency band resources, presenting broad prospects in future 6G. In bistatic scenarios, ISAC systems offer advantages such as resistance to strong electromagnetic interference environments and high concealment. In the existing design of ISAC systems based on linear frequency modulation (LFM) signals in bistatic scenarios, issues such as excessively high range sidelobes and severe false target identification arise, primarily because the radar sensing is affected by the embedded communication information. In order to suppress the sidelobe interference while ensuring the accurate and complete extraction of communication information, thereby enhancing radar sensing performance, the optimization based on an integrated communication and sensing system utilizing LFM was studied. Focusing on modulation schemes and receiver architecture as key points of investigation, two innovative methods were proposed: phase reduction modulation and receiver structure optimization. By employing performance metrics such as ambiguity function and bit error rate, and through comparative simulation analysis, the feasibility and effectiveness of the optimization methods were verified.