Covert communication with noncausal channel-state information at the transmitter

Si-Hyeon Lee, Ligong Wang, Ashish Khisti, Gregory W. Womell
2017 2017 IEEE International Symposium on Information Theory (ISIT)  
We consider the problem of covert communication over a state-dependent channel, where the transmitter has noncausal knowledge of the channel states. Here, "covert" means that the probability that a warden on the channel can detect the communication must be small. In contrast with traditional models without noncausal channel-state information at the transmitter, we show that covert communication can be possible with positive rate. We derive closed-form formulas for the maximum achievable covert
more » ... ommunication rate ("covert capacity") in this setting for discrete memoryless channels as well as additive white Gaussian noise channels. We also derive lower bounds on the rate of the secret key that is needed for the transmitter and the receiver to achieve the covert capacity.
doi:10.1109/isit.2017.8007046 dblp:conf/isit/LeeWKW17 fatcat:52btocvdjfgzdaopwc3cpw3xqa