基于OFDM信号的车联网通信雷达一体化系统同频干扰研究

Communication radar integrated is an important frequency and power saving technology for the development of intelligent transportation system in the future. The OFDM based communication radar integrated system becomes a research hotspot in this crossing field because of its high transmission rate, wide bandwidth and low interception, and other characteristics. Limited by frequency resources, the communication radar integrated system will face the problem of co-channel interference in its large-scale application, which directly affects the quality of communication and suppresses the detection ability of radar. This project aims to solve co-channel interference of internet of vehicles, including channel modeling, co-channel interference characteristic analysis and shared signal design, etc. The research contents include: 1) co-channel interference modeling of internet of vehicles Based on road traffic model, 2) co-channel interference suppression technology based on interference modeling, 3) optimization design technology of OFDM shared signal based on environmental-aware. The research objective of this project is to provide theoretical support for intelligent transportation application. The proposed research method has important scientific significance for promoting its new development.

通信雷达一体化作为一种频率和功率节约型应用技术，是未来智能交通系统发展的重要支撑技术之一。OFDM信号因其高传输速率、大带宽、低截获等特性而在通信和雷达领域都应用广泛，基于OFDM共享信号的通信雷达一体化已成为该交叉领域的研究热点。受限于频率资源，通信雷达一体化系统在其大规模应用时必将面临同频干扰问题，直接影响通信服务质量，压制雷达探测能力。本项目研究同频干扰对车联网通信雷达一体化系统的影响，从信道建模、同频干扰特征分析及共享信号设计等多个方面解决车联网的同频干扰问题。研究内容包括：1）基于道路交通模型的车联网同频干扰信道统一建模；2）车联网雷达功能系统的同频干扰抑制技术；3）基于环境感知的OFDM共享信号优化设计技术。本项目从基础理论出发，探索基于OFDM共享信号的车联网通信雷达一体化系统同频干扰的解决方案，对推动智能交通系统的新发展具有重要科学意义，研究成果可为其应用提供理论支撑。

OFDM共享信号具备高传输速率、大带宽、低截获等特性，且雷达通信一体化设计可实现频率和功率节约，因此基于OFDM共享信号的雷达通信一体化成为该交叉领域的研究热点。本项目针对OFDM雷达通信一体化组网应用中的同频干扰问题开展了相关研究工作。首先，建立了OFDM雷达通信一体化组网系统的同频干扰信道模型，推导了该情形下的雷达目标检测概率；其次，提出了基于交织多址的同频干扰抑制技术；最后，分析了OFDM雷达目标参数超分辨估计的理论性能，建立一体化波形与估计性能相关联的优化模型，提出相应的信号处理优化方案。这些研究工作对OFDM雷达通信一体化组网系统的设计和实际应用提供了理论基础。