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This paper adopts the antenna selection technique to enhance the covert ratein a wireless communication network comprised of a source, a destination , anexternal jammer and an eavesdropper. In the covert communication, the level oftransmit power is low and hence a source with multiple antennas can be adoptedto send the information toward the single antenna destination whileconcurrently, the jammer transmits an artificial noise signal. For this systemmodel, we consider a scenario where the source is forced to select one orseveral of its antennas to transmit its confidential information due to itslimited RF chains. Furthermore, we consider two different jamming scenarios tosupport our covert communication: 1) The destination is unable to cancel thejamming signal, 2) The destination can subtract the jamming signal. For such acommunication network, our aim is to maximize the covert rate subject to powerconstraint and covert communication requirement. In the first scenario, theoptimization problem is non-convex, and hence, it can be solved through usingDifference of Convex function (DC) method while the optimization problem of thesecond scenario is intrinsically convex. Our numerical results show that thehigher the number of selected antennas at the transmitter, the higher thecovert rate will be achieved.

Covert Transmission with Antenna Selection and Using an External Jammer