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Abstract
In this work, we investigated a covert communication method in wireless networks, which is realized by multiantenna full-duplex single relay. In the first stage, the source node sends covert messages to the relay, and the relay uses a single antenna to send interference signals to the adversary node to protect the covert information being transmitted. In the second stage, the relay decodes and forwards the covert information received in the first stage; at the same time, the relay uses zero-forcing beamforming to send interference signals to the warden to ensure covert transmission. The detection error rate, transmission outage probability, maximum effective covert rate, and other performance indicators are derived in two stages, and the total performance of the system is derived and analyzed. Then, the performance indicators are verified and analyzed by simulation. Our analysis shows that the maximum effective covert rate of using the characteristics of multiantenna to interfere with Willie in the second stage is taken as the total covert performance of the system, and the transmission interruption probability is significantly less than that of the first stage, so the corresponding maximum effective concealment efficiency will be greater.
Highlights
We focus on full duplex (FD), relay, and multiantenna covert technology
Our Approach and Contributions. e main contributions of this paper are summarized as follows: (i) We prove that the use of multiantenna FD relay is an effective way to achieve covert wireless communication in fading wireless channels
Since Willie needs to detect whether Alice and Relay send covert messages in the first and second stages, respectively, considering the worse case, it is assumed that Willie knows hAW and hRW and that Relay knows hAR, and since Relay knows Willie’s existence, it is assumed that Relay knows hRW [1]. e wireless channels are subject to independent quasi-static Rayleigh fading; the channels change independently between time slots and remain unchanged within the same communication time slot
Summary
Reference [25] studies the influence of channel estimation inaccuracy and randomness on covert wireless transmission performance and explores the effect of FD relay on covert performance. Reference [25] studies the influence of channel uncertainty of detecting attackers on covert wireless transmission performance in two-hop relay communication system. References [30, 31] study the covert wireless communication scheme with multihop relay transmission. Reference [31] considers the problem of multihop covert relay transmission in unmanned aerial vehicle communication Most of these researches focus on reducing transmission power by relay transmission to enhance covertness or improving the communication performance of legal links by using cooperative diversity gain.
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