Paper Info
Title
Covert Wireless Communications Under Quasi-Static Fading With Channel Uncertainty
Abstract
Covert communications enable a transmitter to send information reliably in the presence of an adversary, who looks to detect whether the transmission took place or not. We consider covert communications over quasi-static block fading channels, where users suffer from channel uncertainty. We investigate the adversary Willie's optimal detection performance in two extreme cases, i.e., the case of perfect channel state information (CSI) and the case of channel distribution information (CDI) only. It is shown that in the large detection error regime, Willie's detection performances of these two cases are essentially indistinguishable, which implies that the quality of CSI does not help Willie in improving his detection performance. This result enables us to study the covert transmission design without the need to factor in the exact amount of channel uncertainty at Willie. We then obtain the optimal and suboptimal closed-form solution to the covert transmission design. Our result reveals fundamental difference in the design between the case of quasi-static fading channel and the previously studied case of non-fading AWGN channel.
Year
DOI
Venue
2021
10.1109/TIFS.2020.3029902
IEEE Transactions on Information Forensics and Security
Keywords
DocType
Volume
Physical layer security,covert wireless communications,channel uncertainty,channel training,quasi-static fading channel
Journal
16
ISSN
Citations 
PageRank 
1556-6013
5
0.42
References 
Authors
0
2
Name
Order
Citations
PageRank
Khurram Shahzad116525.77
Xiangyun Zhou22411120.16