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Covert Communications With a Full-Duplex Receiver in Non-Coherent Rayleigh Fading
- Source :
- IEEE Transactions on Communications. 69:1882-1895
- Publication Year :
- 2021
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2021.
-
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.
- Subjects :
- Technology
Covert communication
Computer science
Channel estimation
050801 communication & media studies
Data_CODINGANDINFORMATIONTHEORY
02 engineering and technology
Receivers
Interference cancellation
Engineering
0508 media and communications
full-duplex
Interference (communication)
artificial noise
Computer Science::Multimedia
1005 Communications Technologies
0202 electrical engineering, electronic engineering, information engineering
Electronic engineering
Fading
fading channels
Electrical and Electronic Engineering
Computer Science::Cryptography and Security
Computer Science::Information Theory
Rayleigh fading
Science & Technology
05 social sciences
Uncertainty
physical layer security
0804 Data Format
Engineering, Electrical & Electronic
Detectors
020206 networking & telecommunications
0906 Electrical and Electronic Engineering
Single antenna interference cancellation
Covert
Channel state information
Telecommunications
Artificial noise
Jamming
Rayleigh channels
Communication channel
Subjects
Details
- ISSN :
- 15580857 and 00906778
- Volume :
- 69
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Communications
- Accession number :
- edsair.doi.dedup.....827386b44367f64a8dde9a2cdeecefbc