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Covert wireless communication or low probability of detection (LPD)communication that employs the noise or jamming signals as the cover to hideuser's information can prevent a warden Willie from discovering user'stransmission attempts. Previous work on this problem has typically assumed thatthe warden is static and has only one antenna, often neglecting an activewarden who can dynamically adjust his/her location to make better statistictests. In this paper, we analyze the effect of an active warden in covertwireless communications on AWGN channels and find that, having gathered samplesat different places, the warden can easily detect Alice's transmission behaviorvia a trend test, and the square root law is invalid in this scenario.Furthermore, a more powerful warden with multiple antennas is harder to bedeceived, and Willie's detection time can be greatly shortened.

Challenges in Covert Wireless Communications with Active Warden on AWGN channels