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We consider a cognitive radio system that consists of primary user, secondary user, and their destinations. The secondary user has a relaying capability, i.e., it transmits the relayed packets from the primary user. Unlike most of the previous works that restrict the secondary user to transmit only in the idle time slots, we assume that the secondary user interferes on the primary user with certain...
In this work, the performance of two-hop wireless systems under statistical queueing \emph{end-to-end} delay constraints is investigated. In the two-hop links, it is assumed that there is no direct link between the source and destination. The communication between the source and destination is accomplished via an intermediate full-duplex relay node, which forwards the information to the destination...
Cognitive radio (CR) technology has been considered promising to enhance spectrum efficiency via opportunistic transmission at link level. To make CR useful, networking CRs to form a cognitive radio network (CRN) is able to support end-to-end transmission from CR source to CR destination. However, the opportunistic nature of CR link for interference avoidance to primary users degrades the quality-of-service...
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