论文标题
I/Q不平衡下的环境反向散射系统的保密分析
Secrecy Analysis of Ambient Backscatter NOMA Systems under I/Q Imbalance
论文作者
论文摘要
我们调查了环境反向散射（AMBC）非正交多访问（NOMA）系统的可靠性和安全性，该系统的目的是在窃听者在场的情况下与两个Noma用户进行通信。我们考虑了一种更实用的案例，即节点和反向散射设备（BD）患有相位和正交相位不平衡（IQI）。更具体地说，在封闭形式中得出了中断概率（OP）和截距概率（IP）的精确分析表达式。此外，讨论了OP的渐近行为和相应的多样性顺序。数值结果表明：1）尽管IQI降低了可靠性，但它可以增强安全性。 2）与传统的正交多重访问（OMA）系统相比，当信噪比（SNR）比率较低时，AMBC-NOMA系统可以获得更好的可靠性； 3）由于反射系数\ b {eta}，因此OP有误差地板。
We investigate the reliability and security of the ambient backscatter (AmBC) non-orthogonal multiple access (NOMA) systems, where the source aims to communication with two NOMA users in the presence of an eavesdropper. We consider a more practical case that nodes and backscatter device (BD) suffer from in-phase and quadrature-phase imbalance (IQI). More specifically, exact analytical expressions for the outage probability (OP) and the intercept probability (IP) are derived in closedform. Moreover, the asymptotic behaviors and corresponding diversity orders for the OP are discussed. Numerical results show that: 1) Although IQI reduces the reliability, it can enhance the security. 2) Compared with the traditional orthogonal multiple access (OMA) system, the AmBC-NOMA system can obtain better reliability when the signal-to-noise (SNR) ratio is low; 3) There are error floors for the OP because of the reflection coefficient \b{eta} .
