Covert Communication With Channel-State Information at the Transmitter

We consider the problem of covert communication over a state-dependent channel, where the transmitter has causal or noncausal knowledge of the channel states. Here, covert means that a warden on the channel should observe similar statistics when the transmitter is sending a message and when it is no...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on information forensics and security 2018-09, Vol.13 (9), p.2310-2319
Main Authors: Si-Hyeon Lee, Ligong Wang, Khisti, Ashish, Wornell, Gregory W.
Format: Article
Language:English
Subjects:
AWGN channels
channel uncertainty
channel-state information at the transmitter
Computer Science
Covert communication
Information Theory
Interference
Jamming
likelihood encoding
low probability of detection
Memoryless systems
Monte Carlo methods
Receivers
Transmitters
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We consider the problem of covert communication over a state-dependent channel, where the transmitter has causal or noncausal knowledge of the channel states. Here, covert means that a warden on the channel should observe similar statistics when the transmitter is sending a message and when it is not. When a sufficiently long secret key is shared between the transmitter and the receiver, we derive closed-form formulas for the maximum achievable covert communication rate (covert capacity) for discrete memoryless channels and, when the transmitter's channel-state information (CSI) is noncausal, for additive white Gaussian noise (AWGN) channels. For certain channel models, including the AWGN channel, we show that the covert capacity is positive with CSI at the transmitter, but is zero without CSI. 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.
ISSN:1556-6013
1556-6021
DOI:10.1109/TIFS.2018.2818650