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arXiv 1812.10312eess.SP
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利用天线选择和使用外部干扰机的隐蔽传输

Covert Transmission with Antenna Selection and Using an External Jammer

Morteza Sarkheil, Paeiz Azmi, Moslem Forouzesh, Ali Kuhestani

摘要:

在由信源、信宿、外部干扰源和窃听者组成的无线通信网络中,采用天线选择技术来提高隐蔽率。在隐蔽通信中,发射功率的水平是低的,因此可以采用具有多个天线的源来向单个天线目的地发送信息,而同时,干扰机发射人工噪声信号。对于这个系统模型,我们考虑的情况下,源被迫选择一个或几个天线发送其机密信息,由于其有限的RF链。此外,我们考虑了两种不同的干扰场景来支持我们的隐蔽通信:1)目的地无法取消干扰信号,2)目的地可以减去干扰信号。对于这样的通信网络,我们的目标是最大化的隐蔽率受到功率约束和隐蔽通信的要求。在第一种情况下,优化问题是非凸的,因此,它可以通过使用凸函数(DC)方法的差异来解决,而第二种情况下的优化问题本质上是凸的。我们的数值计算结果表明,在发射端选择的天线数越高,将实现更高的隐蔽率。

英文摘要:

This paper adopts the antenna selection technique to enhance the covert rate in a wireless communication network comprised of a source, a destination , an external jammer and an eavesdropper. In the covert communication, the level of transmit power is low and hence a source with multiple antennas can be adopted to send the information toward the single antenna destination while concurrently, the jammer transmits an artificial noise signal. For this system model, we consider a scenario where the source is forced to select one or several of its antennas to transmit its confidential information due to its limited RF chains. Furthermore, we consider two different jamming scenarios to support our covert communication: 1) The destination is unable to cancel the jamming signal, 2) The destination can subtract the jamming signal. For such a communication network, our aim is to maximize the covert rate subject to power constraint and covert communication requirement. In the first scenario, the optimization problem is non-convex, and hence, it can be solved through using Difference of Convex function (DC) method while the optimization problem of the second scenario is intrinsically convex. Our numerical results show that the higher the number of selected antennas at the transmitter, the higher the covert rate will be achieved.

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