Abstract
In this work, a wireless covert communication system with full-duplex (FD) multiantenna receiver is considered. In order to improve the convert performance of the wireless communication system in the FD mode, a scheme based on selection combining/zero forcing beamforming (SC/ZFB) is proposed. More specifically, a covert message receiver with a FD multiantenna uses the zero forcing beamforming method to transmit randomly varying noise power to the adversary while receiving covert information from the sender. Firstly, we derive the optimal detection threshold and the corresponding closed expression of the minimum detection error rate of the warden. Secondly, the transmission interruption probability is explored to measure the communication reliability between the sender and the receiver of the covert message. Finally, the throughput performance of the covert communication system is analyzed under random geometry. Our analysis shows that the proposed SC/ZFB scheme can achieve the positive effective convert rate while interfering with the detection of the warden as much as possible. It is worth noting that the increase of the number of antennas and the power of covert message transmission can improve the convert performance of the system.
Highlights
In this work, a wireless covert communication system with full-duplex (FD) multiantenna receiver is considered
In order to improve the convert performance of the wireless communication system in the FD mode, a scheme based on selection combining/ zero forcing beamforming (SC/ZFB) is proposed
Our analysis shows that the proposed SC/ZFB scheme can achieve the positive effective convert rate while interfering with the detection of the warden as much as possible
Summary
Based on FD operation, Bob first selects the best antenna based on the channel state information (CSI) of the channel between Alice and Bob to receive the covert messages and utilizes the remaining NB − 1 antennas to send a weighted AN signal to disturb Willie’s detection. Where TW 1/n ni 1 yWillie[i] is the average power received at Willie in the slot, τ is a predefined detection threshold, D1 and D0 are the binary decisions that infer whether the Alice transmits covert message to Bob or not, respectively, and decision D0 is made if TW < τ, whereas decision D1 is made otherwise.
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