Challenges in Covert Wireless Communications with Active Warden on AWGN channels
arXiv:1901.03185
Abstract
Covert wireless communication or low probability of detection (LPD) communication that employs the noise or jamming signals as the cover to hide user's information can prevent a warden Willie from discovering user's transmission attempts. Previous work on this problem has typically assumed that the warden is static and has only one antenna, often neglecting an active warden who can dynamically adjust his/her location to make better statistic tests. In this paper, we analyze the effect of an active warden in covert wireless communications on AWGN channels and find that, having gathered samples at different places, the warden can easily detect Alice's transmission behavior via a trend test, and the square root law is invalid in this scenario. Furthermore, a more powerful warden with multiple antennas is harder to be deceived, and Willie's detection time can be greatly shortened.
arXiv comment14 pages, 13 figures. arXiv admin note: text overlap with arXiv:1805.06182
References in corpus (5)
- Covert Communication over Noisy Channels: A Resolvability Perspective
- Covert Single-hop Communication in a Wireless Network with Distributed Artificial Noise Generation
- Secret key expansion from covert communication
- The Sound and the Fury: Hiding Communications in Noisy Wireless Networks with Interference Uncertainty
- Computationally Efficient Covert Communication