基于DF中继协作的车联网安全传输性能研究

5G时代的到来加快了以车路协同为核心的车联网技术的发展脚步。高效,可靠,安全的通信质量将是实现智能交通管理系统,完善智慧出行的基本要求。因此,针对存在信息窃取者的车联网中继协作传输场景,利用机会式中继选择策略与最大比合并技术设计了直接传输链路与多跳中继转发链路共存的安全传输方案,旨在提高信息传输的可靠性及安全性。同时,在获得信道概率密度函数及累积分布函数的基础上,利用全概率公式等方法推导出基于DF(Decode-and-Forward)中继协作传输的车联网系统安全中断概率的闭合表达式,其中涉及的信息传输信道均服从Nakagami-m分布,提高了理论推导的难度。最终的仿真实验证实了理论推导的准确性及本方案的可行性。

Performance analysis of IoV secure transmission based on DF relay cooperation

The advent of the 5G era has accelerated the development of IoV technologies with vehicle-road collaboration at the core.Efficient, reliable, and secure communication quality will be the basic requirements for implementing an intelligent traffic management system and improving smart travel.Therefore, for the scenario of relay cooperative transmission of IoV where information stealers exist, an opportunistic relay selection strategy and maximum ratio combining technology are used to design a secure transmission scheme in which the direct transmission link and the multi-hop relay forwarding link coexist, aiming to improve the reliability and security of information transmission.At the same time, based on obtaining the channel probability density function and cumulative distribution function, a closed expression for the secure outage probability of the IoV system based on DF(Decode-Forward) relay cooperative transmission is derived using methods such as the full probability formula.The information transmission channels involved are all subject to the Nakagami-m distribution, which makes the theoretical derivation more difficult. The final simulation experiments confirmed the accuracy of the theoretical derivation and the feasibility of the scheme.