多层建筑室内无线网络的协作安全研究

多层建筑室内无线网络安全问题的特殊性，主要由其具有随机性、动态性和复杂性的空间拓扑结构所引起的。针对多层室内无线网络节点分布随机、空间结构复杂、损耗类型多样等特点，该文结合物理层安全与随机几何理论，对多层室内无线网络中的多节点协作安全传输展开研究。首先，基于多层泊松点过程对K层室内无线网络进行建模；在此基础上，将协作传输引入多层室内无线网络，并提出该网络的安全概率分析框架；随后，结合理论推导及仿真，分析了楼层总数、安全速率门限、用户所处楼层和各层发射功率配置等因素对多层室内无线网络安全性能的影响。最后，通过仿真验证了协作传输能够有效提高室内无线网络的安全性能。

Secrecy Performance Analysis of Cooperative Transmission for Multi-floor Building Indoor Wireless Networks

The particularity of security threats for Multi-floor building Indoor Wireless Networks (MIWNs) is mainly caused by its stochastic, dynamic and complex spatial topology. According to the features of MIWNs, such as the randomization of node distribution, complexity of spatial structure, and diversification of loss types, physical layer security technologies and stochastic geometry theory are utilized to study the cooperative secrecy transmission in MIWNs. First, a fundamental system model for MIWNs is proposed based on multi-floor Poisson point process. On this basis, cooperative transmission is introduced into MIWNs and an analysis framework to evaluate the secrecy probability for cooperative transmissions in MIWNs is proposed. Then, based on the theoretical analyses and simulation results, the influences of total floor number, secrecy rate threshold, floor number for target user, and the transmit power allocation on secrecy performance in MIWNs are examined. Finally, the simulations verify that the cooperative transmission can effectively improve the secrecy performance of the MIWNs.