Visible to the public Covert Communication in Fading Channels under Channel Uncertainty

TitleCovert Communication in Fading Channels under Channel Uncertainty
Publication TypeConference Paper
Year of Publication2017
AuthorsShahzad, K., Zhou, X., Yan, S.
Conference Name2017 IEEE 85th Vehicular Technology Conference (VTC Spring)
Keywordscompositionality, covert channels, Detectors, fading channels, pubcrawl, Radiometry, Receivers, Resiliency, Scalability, Uncertainty, Wireless communication

A covert communication system under block fading channels is considered, where users experience uncertainty about their channel knowledge. The transmitter seeks to hide the covert communication to a private user by exploiting a legitimate public communication link, while the warden tries to detect this covert communication by using a radiometer. We derive the exact expression for the radiometer's optimal threshold, which determines the performance limit of the warden's detector. Furthermore, for given transmission outage constraints, the achievable rates for legitimate and covert users are analyzed, while maintaining a specific level of covertness. Our numerical results illustrate how the achievable performance is affected by the channel uncertainty and required level of covertness.

Citation Keyshahzad_covert_2017