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In this paper, we study covert communications between {a pair of} legitimatetransmitter-receiver against a watchful warden over slow fading channels. Therecoexist multiple friendly helper nodes who are willing to protect the covertcommunication from being detected by the warden. We propose an uncoordinatedjammer selection scheme where those helpers whose instantaneous channel gainsto the legitimate receiver fall below a pre-established selection thresholdwill be chosen as jammers radiating jamming signals to defeat the warden. Bydoing so, the detection accuracy of the warden is expected to be severelydegraded while the desired covert communication is rarely affected. We thenjointly design the optimal selection threshold and message transmission ratefor maximizing covert throughput under the premise that the detection error ofthe warden exceeds a certain level. Numerical results are presented to validateour theoretical analyses. It is shown that the multi-jammer assisted covertcommunication outperforms the conventional single-jammer method in terms ofcovert throughput, and the maximal covert throughput improves significantly asthe total number of helpers increases, which demonstrates the validity andsuperiority of our proposed scheme.

Wireless Covert Communications Aided by Distributed Cooperative Jamming over Slow Fading Channels