Studying strictly positive secure capacity in cognitive radio-based non-orthogonal multiple access

This paper studies a downlink security-aware secure outage performance in the secondary network of cognitive radio-assisted non-orthogonal multiple access (CR-NOMA). The relay is employed to assist transmission from source destinations. subject constraints fixed power allocation factor assigned each user. based on channel state information (CSI) at physical layer which an eavesdropper intends steal information. According considered system, exact expressions Strictly positive capacity (SPSC) are proved analyze system terms performance. Finally, user problem evaluated via Monte-Carlo simulation method. main results indicate that proposed can be improved significantly.