Covert communications with a full-duplex receiver in non-coherent rayleigh fading
File(s)
Accepted version
Author(s)
Zheng, Mengfan
Hamilton, Alexander
Ling, Cong
Type
Journal Article
Abstract
In a majority of research on covert communications, knowledge about channel state information (CSI) of main channel and/or warden channel is assumed to be known or partially known. However, a covert user may not afford to perform channel estimation in practice, and acquiring the warden’s CSI is even impossible. In this paper, we investigate covert communications over non-coherent Rayleigh fading channels, in both i.i.d. fast fading and slow fading cases. We observe that the purpose of covert communication in many scenarios is to hide the existence of the sender, not the receiver. Therefore, we allow the receiver to work in full-duplex mode such that it can emit artificial noise (AN) while receiving signals simultaneously. We analyse the achievable covert rates with fixed and varying AN power and show that in both fast and slow fading cases, it is possible to achieve a positive covert rate. For the slow fading case, we further extend the proposed strategy to a multi-user scenario, in which multiple other users share the same spectral resource and cause interference at the warden. Extensive simulations are performed to verify the correctness of our analysis, which provide new insights on the AN design problem in non-coherent channels.
Date Issued
2021-03-01
Date Acceptance
2020-11-16
Citation
IEEE Transactions on Communications, 2021, 69 (3), pp.1882-1895
ISSN
0090-6778
Publisher
Institute of Electrical and Electronics Engineers
Start Page
1882
End Page
1895
Journal / Book Title
IEEE Transactions on Communications
Volume
69
Issue
3
Copyright Statement
© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Sponsor
Defence Science and Technology Laboratory (DSTL)
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000631202500036&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
DSTLX1000128141
Subjects
Science & Technology
Technology
Engineering, Electrical & Electronic
Telecommunications
Engineering
Receivers
Rayleigh channels
Interference cancellation
Channel estimation
Uncertainty
Jamming
Detectors
Covert communication
fading channels
full-duplex
artificial noise
physical layer security
Publication Status
Published
Date Publish Online
2020-11-30