Covert Communication in Fading Channels under Channel Uncertainty
Date
2017
Authors
Shahzad, Khurram
Yan, Shihao
Zhou, Xiangyun
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Volume Title
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Abstract
A covert communication system under block fading
channels is considered, where users experience uncertainty about
their channel knowledge. The transmitter seeks to hide the
covert communication to a private user by exploiting a legitimate
public communication link, while the warden tries to detect
this covert communication by using a radiometer. We derive
the exact expression for the radiometer’s optimal threshold,
which determines the performance limit of the warden’s detector.
Furthermore, for given transmission outage constraints, the
achievable rates for legitimate and covert users are analyzed,
while maintaining a specific level of covertness. Our numerical
results illustrate how the achievable performance is affected by
the channel uncertainty and required level of covertness.
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Conference paper
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Open Access
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