多用户分集与能量受限非可信中继系统遍历安全性能分析

研究了一种能量受限的非可信中继与多用户分集技术相结合的两跳链路安全网络通信模型。为提升系统安全性能,本文采用混合时间-功率分配中继(time-power splitting-based relaying, TPSR)协议,并结合机会调度策略(opportunistic scheduling strategy, OSS)从多用户分集网络中选择一个最佳目的节点作为信息接收端。基于随机选择(random selection, RS)策略,该文中利用低复杂度的高斯Q函数分析系统的安全性能以及在协作中继上进行能量采集活动不中断的条件下推导了系统的遍历安全速率(ergodic secrecy rate, ESR)的近似闭合表达式。此外,将提出的OSS与RS通信方案下性能进行对比,证明本文所提出OSS更适用于分布式多用户选择网络。

Ergodic Secrecy Performance Analysis of Multiuser Diversity and Energy Constrained Untrusted Relay System

A two-hop link secure communication network model, which is based on energy-constrained untrusted relay and multiuser diversity network, is proposed in this paper. In order to improve the secrecy performance of the sensor network, a hybrid time-power splitting-based relaying (TPSR) protocol is applied on untrusted relay, and an optimal destination node is selected from the multiuser diversity system as the terminal, according to the opportunistic scheduling strategy (OSS). Based on the random selection (RS) strategy, a low complexity Gaussian Q-function is used to analyze the secrecy performance and an approximate closed-form expression of the ergodic secrecy rate (ESR) is derived under the condition that the relay obtains the required power for activity. In addition, the performance of the proposed OSS technology is compared with that of the RS scheme, which proves that OSS technology is more suitable for distributed multiuser selection network.