Abstract
This paper focuses on the covert communication in a two-hop relay system consisting of a transmitter, a relay, a receiver and a warden, where the relay can flexibly select between the transmission modes of full-duplex (FD)/half-duplex (HD) as well as between the forwarding modes of amplify-and-forward (AF)/decode-and-forward (DF). For a given combination of transmission mode and forwarding mode, we first provide theoretical modeling for the covert outage probability, transmission outage probability and covert rate. Under such a combination, we then explore the optimal designs of the transmitter transmission rate and the relay transmit power for covert rate maximization, subjecting to the constraints of covert outage probability and upper bound on relay transmit power. Finally, we provide extensive numerical results to illustrate the performance comparison among different combinations of transmission mode and forwarding mode, and how to jointly select a proper combination of transmission mode and forwarding mode to achieve the maximum covert rate in a relay system with given settings of transmitter transmission rate, self-interference coefficient of FD, constraints of covert outage probability, and upper bound on relay transmit power.
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