Intelligent Covert Communication Design for Cooperative Cognitive Radio Network

Extensive research attentions have been devoted to studying cooperative cognitive radio net-works(CCRNs),where secondary users(SU)provid-ing cooperative transmissions can be permitted by pri-mary users(PU)to use spectrum.In order to maximize SU's utility,SU may transmit its own information during the period of cooperative transmission,which stimulates the use of covert transmission against PU's monitoring.For this sake,this article reviews the moti-vations of studying covert communications in CCRN.In particular,three intelligent covert transmission ap-proaches are developed for maximizing SU's utility in CCRNs,namely,intelligent parasitic covert transmis-sion(IPCT),intelligent jammer aided covert transmis-sion(IJCT)and intelligent reflecting surface assisted covert transmission(IRSC).Further,some raw perfor-mance evaluations are discussed,and a range of poten-tial research directions are also provided.