Covert Transmission with Antenna Selection and Using an External Jammer.

Morteza Sarkheil, P. Azmi, Moslem Forouzesh, Ali Kuhestani
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引用次数: 0

Abstract

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.
天线选择和使用外部干扰器的隐蔽传输。
本文采用天线选择技术来提高由源、目标、外部干扰器和窃听器组成的无线通信网络的隐蔽率。在隐蔽通信中,由于发射功率水平较低,可以采用多天线源向单天线目标发送信息,同时干扰机发送人工噪声信号。对于该系统模型,我们考虑了这样一种情况:由于射频链有限,源被迫选择一个或几个天线来传输机密信息。此外,我们考虑了两种不同的干扰场景来支持隐蔽通信:1)目的地无法消除干扰信号,2)目的地可以减去干扰信号。对于这样的通信网络,我们的目标是在功率约束和隐蔽通信要求下最大化隐蔽速率。在第一种情况下,优化问题是非凸的,因此可以使用凸函数差分法(DC)来解决,而第二种情况下的优化问题本质上是凸的。数值结果表明,发射机所选天线数越多,隐蔽率越高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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