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首页> 外文期刊>IEEE Transactions on Vehicular Technology >Enhancing Physical Layer Security With Artificial Noise in Large-Scale NOMA Networks
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Enhancing Physical Layer Security With Artificial Noise in Large-Scale NOMA Networks

机译：大规模NOMA网络中的人工噪声提高物理层安全性

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摘要

This paper investigates the secrecy outage performance for a large-scale downlink system with full-duplex (FD) non-orthogonal multiple access (NOMA) transmission aided by artificial noise (AN). In the system, legitimate users (LUs) are randomly distributed according to homogeneous Poisson point processes whereas a passive eavesdropper (Eve) is certainly located. We introduce a secure cooperative communication scheme, in which nearby NOMA users operating in FD mode act as jammers and generate AN to enhance the physical layer security (PLS) of the legitimate transmission. Closed-form expressions in terms of the secrecy outage probability (SOP) for a user pair are acquired. Following the mathematical results, secrecy diversity order analysis is further carried out for two scenarios, i.e., 1) fixed transmit signal-to-noise ratio (SNR) at the Eve, and 2) transmit SNR at the Eve being proportional to that of LUs. Closed-form expressions of asymptotic SOP for the two scenarios are also obtained. Monte Carlo simulations are performed to certify the veracity of the theoretic analysis and illustrate that the proposed scheme employing both AN and FD-NOMA is superior in the secrecy outage to the NOMA scheme without AN and the orthogonal multiple access scheme with AN. Furthermore, the SOP performance enhancement through proper secrecy rate target selection and power allocation optimization is also evidenced by the simulations.
机译：本文调查了具有全双工（FD）非正交多址（NOMA）通过人工噪声（A）的全双工（FD）非正交多通道（NOMA）的保密性中断性能。在系统中，合法用户（LUS）根据同质泊松点处理随机分布，而无源窃听器（夏娃）肯定是所在的。我们介绍了一种安全的协作通信方案，其中在FD模式下操作的附近的NOMA用户充当干扰器并生成用于增强合法传输的物理层安全性（PL）。获取用户对的秘密中断概率（SOP）的闭合表达式。在数学结果之后，在夏娃的两种情况下进一步执行保密分集顺序分析，即固定发射信噪比（SNR），2）在夏娃中传输SNR与LU成比例。还获得了两种情况的渐近SOP的闭合表达。 Monte Carlo模拟进行认证，以证明理论分析的真实性，并说明采用A和FD-NOMA的所提出的方案在没有A和正交的多种访问方案的情况下对NOMA方案的保密中断优越。此外，通过适当的保密率目标选择和功率分配优化的SOP性能增强也是通过模拟来证明的。

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