摘要
Covert communication aims to prevent the warden from detecting the presence of communications,i.e.with a negligible detection probability.When the distance between the transmitter and the legitimate receiver is large,large transmission power is needed,which in turn increases the detection probability.Relay is an effective technique to tackle this problem,and various relaying strategies have been proposed for long-distance covert communication in these years.In this article,we first offer a tutorial on the relaying strategies utilized in covert transmission.With the emergence of reflecting intelligent surface and its application in covert communications,we propose a hybrid relay-reflecting intelligent surface(HR-RIS)-assisted strategy to further enhance the performance of covert communications,which simultaneously improves the signal strength received at the legitimate receiver and degrades that at the warden relying on optimizing both the phase and the amplitude of the HR-RIS elements.The numerical results show that the proposed HR-RIS-assisted strategy significantly outperforms the conventional RIS-aided strategy in terms of covert rate.
Covert communication aims to prevent the warden from detecting the presence of communications,i.e.with a negligible detection probability.When the distance between the transmitter and the legitimate receiver is large,large transmission power is needed,which in turn increases the detection probability.Relay is an effective technique to tackle this problem,and various relaying strategies have been proposed for long-distance covert communication in these years.In this article,we first offer a tutorial on the relaying strategies utilized in covert transmission.With the emergence of reflecting intelligent surface and its application in covert communications,we propose a hybrid relay-reflecting intelligent surface(HR-RIS)-assisted strategy to further enhance the performance of covert communications,which simultaneously improves the signal strength received at the legitimate receiver and degrades that at the warden relying on optimizing both the phase and the amplitude of the HR-RIS elements.The numerical results show that the proposed HR-RIS-assisted strategy significantly outperforms the conventional RIS-aided strategy in terms of covert rate.
作者
胡锦松
石小强
陈由甲
赵铁松
束锋
Jinsong Hu;Xiaoqiang Shi;Youjia Chen;Tiesong Zhao;Feng Shu(College of Physics and Information Engineering,Fuzhou University,Fuzhou,Fujian 350116,China;Fujian Key Laboratory for Intelligent Processing and Wireless Transmission of Media Information,Fuzhou University,Fuzhou,Fujian 350116,China;School of Information and Communication Engineering,Hainan University,Haikou,Hainan 570100,China)
基金
supported in part by the National Natural Science Foundation of China(Nos.62001116,62271150,62171134,U22A2002 and 62071234)
the Natural Science Foundation of Fujian Province under Grant(Nos.2020J05106 and2022J01081)
the Major Science and Technology plan of Hainan Province under Grant ZDKJ2021022
the Scientific Research Fund Project of Hainan University under Grant KYQD(ZR)-21008
