Secure Resource Allocation in OFDMA-BasedCooperative Cognitive Radio Systems

In this paper, we investigate a cooperativecommunication framework to provide secure communications forsecondary users within an Orthogonal Frequency-DivisionMultiple Access (OFDMA) based underlay cognitive network.By proposing a radio resource allocation problem with the aimof maximizing the secrecy sum-rate of secondary users andsolving it, we show that deployment of relays is vital to achieve anon-zero secrecy sum rate. The impact of different systemparameters on the achievable secrecy sum rate is alsoinvestigated through simulations

کلیدواژه ها:

Physical (PHY) layer security ، cognitive radionetworks ، decode-and-forward relay.