Outage Performance of Cognitive Wireless Relay Networks

— In this paper, we investigate the outage performance of cognitive wireless relay networks where source nodes communicate to their destinations via multiple hops facilitated by intermediate cognitive nodes able to acquire spectrum holes. Specifically, we consider a model that consists of a source node, a destination node, and a group of network clusters each consisting of a number of cognitive (unlicensed) relay nodes and a primary (licensed) node. Cognitive nodes relay information from the source depending on their geographical proximity and their ability to acquire the spectrum hole successfully. We investigate the high SNR approximation of the outage probability of the resulting two-hop system to obtain the diversity order. We show that full diversity is achieved only if each relay node successfully identifies the spectrum hole unoccupied by the corresponding primary node in the cluster, and that the diversity order can be significantly less for imperfect spectrum acquisition....

• Type: Conference
• Year: 2006
• Where: GLOBECOM
• Authors: Kyounghwan Lee, Aylin Yener
• Keywords: Cognitive Nodes, Cognitive Relay Node, GLOBECOM 2006, Relay Nodes, Telecommunications