Recently, three useful secrecy metrics based on the partial secrecy regime were proposed to analyze secure transmissions on wireless systems over quasi-static fading channels, namely: generalized secrecy outage probability, average fractional equivocation, and average information leakage. These metrics were devised from the concept of fractional equivocation, which is related to the decoding error probability at the eavesdropper, so as to provide a comprehensive insight on the practical implementation of wireless systems with different levels of secrecy requirements. Considering the partial secrecy regime, in this paper we examine the secrecy performance of an amplify-and-forward relaying network with an untrusted relay node, where a destination-based jamming is employed to enable secure transmissions. In this regard, a closed-form approximation is derived for the generalized secrecy outage probability, and integral-form expressions are obtained for the average fractional equivocation and the average information leakage rate. Additionally, equal and optimal power allocation schemes are investigated and compared for the three metrics. From this analysis, we show that different power allocation approaches lead to different system design criteria. The obtained expressions are validated via Monte Carlo simulations.

中文翻译：

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部分保密机制下不可信中继中继网络的保密性能和功率分配


最近，提出了三种基于部分保密制度的有用保密度量来分析准静态衰落信道上无线系统的安全传输，即：广义保密中断概率、平均分数模棱两可和平均信息泄漏。这些指标是根据分数模棱两可的概念设计的，它与窃听者的解码错误概率有关，以便为具有不同保密要求级别的无线系统的实际实现提供全面的见解。考虑到部分保密制度，在本文中，我们研究了具有不可信中继节点的放大转发中继网络的保密性能，其中采用基于目的地的干扰来实现安全传输。在这方面，推导了广义保密中断概率的封闭形式近似，并获得了平均分数歧义和平均信息泄漏率的积分形式表达式。此外，还研究并比较了这三个指标的平等和最优功率分配方案。通过此分析，我们表明不同的功率分配方法会导致不同的系统设计标准。所获得的表达式通过蒙特卡罗模拟进行验证。