Improving security of wireless telecommunication networks based on covert communication in presence of a jammer using energy harvesting technique and multiple beamforming

In Covert Communication, power consumption and the transmitted bit rate are very important. However, in conventional networks, the power of the nodes is provided by placing separate batteries inside them. In some cases, it is not possible to replace or recharge those batteries. In addition, the transmitted bit rate is very limited. This may be for maintaining the security in covert communication in the sense that the data signal must be covert inside the base noise. In this article, we present different plans to optimize the total power consumption and increase the transmitted bit rate in covert communication. The basis of the proposed method is transmitting jammer signal to increase the probability of detection error in the eavesdropper and reduce power consumption in the transmitter to send the main message to the legal receiver using energy harvesting technique. In the proposed method, also, the beam forming technique is presented and applied to increase the covert rate and reduce the interference in the receiver. To evaluate this scheme, an optimization problem is formulated and an iterative algorithm is proposed to solve it. Various simulations and numerical results proves the efficiency of our proposal in its ability to increase security in telecommunications networks based on covert communication via energy obtained by jamming and harvesting. Moreover, the simulation results show that the 3D beamforming increases covert rate about 80% compared to two-dimensional beamforming method and the optimality gap is about 50% according to energy harvesting technique.