In this work, the secrecy of a typical wireless cooperative dual-hop non-orthogonal multiple access (NOMA)-enabled decode-and-forward (DF) relay network is investigated with the impact of collaborative and non-collaborative eavesdropping. The system model consists of a source that broadcasts the multiplexed signal to two NOMA users via a DF relay, and information security against the eavesdropper nodes is provided by a helpful jammer. The performance metric is secrecy rate and ergodic secrecy capacity is approximated analytically. In addition, a differential evolution algorithm-based power allocation scheme is proposed to find the optimal power allocation factors for relay, jammer, and NOMA users by employing different jamming schemes. Furthermore, the secrecy rate analysis is validated at the NOMA users by adopting different jamming schemes such as without jamming (WJ) or conventional relaying, jamming (J), and with control jamming (CJ). Simulation results demonstrate the superiority of CJ over the J and WJ schemes. Finally, the proposed power allocation outperforms the fixed power allocation under all conditions considered in this work.

中文翻译：

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多窃听者下启用 NOMA 的协作网络的功率分配辅助保密分析

在这项工作中，在协作和非协作窃听的影响下，研究了典型的无线协作双跳非正交多址 (NOMA) 启用解码转发 (DF) 中继网络的保密性。该系统模型由一个源组成，该源通过 DF 中继向两个 NOMA 用户广播多路复用信号，并且由有用的干扰器提供针对窃听节点的信息安全。性能指标是保密率和遍历保密容量的近似分析。此外，提出了一种基于差分进化算法的功率分配方案，通过采用不同的干扰方案来寻找中继、干扰和NOMA用户的最佳功率分配因子。此外，通过采用不同的干扰方案，例如无干扰 (WJ) 或常规中继、干扰 (J) 和控制干扰 (CJ)，NOMA 用户验证了保密率分析。仿真结果证明了 CJ 优于 J 和 WJ 方案。最后，在这项工作中考虑的所有条件下，所提出的功率分配优于固定功率分配。