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- W2014786564 abstract "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. Thus, we set out to improve the outage performance by incorporating a specific intracluster cooperation scheme where neighboring cognitive relay nodes in a cluster collaborate with a desired cognitive relay node. We show that the combination of this intra-cluster cooperation along with the system level cooperation via relaying through cognitive nodes improves the outage performance significantly, and the full diversity can be achieved if the proper number of neighboring relay nodes participate in the intra-cluster cooperation." @default.
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- W2014786564 date "2006-11-01" @default.
- W2014786564 modified "2023-10-10" @default.
- W2014786564 title "CTH17-4: Outage Performance of Cognitive Wireless Relay Networks" @default.
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- W2014786564 doi "https://doi.org/10.1109/glocom.2006.132" @default.
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