Ummy Habiba

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—In this paper, the authors have explored the idea of secondary spectrum access by using cognitive radios (CR) in a secondary network deployed in the region of a wireless cellular network. In the CR network, secondary users (SUs) opportunistically access the underutilized spectrum owned by the licensed primary users (PUs) of the cellular network for their(More)
This paper addresses a cognitive radio (CR) network scenario where a relay is assigned to mitigate interference to primary users (PUs). We develop an average probability of successful secondary transmission (PSST) to introduce relay in the CR network. The power allocation is done using dual domain concept to maximize the system throughput as well as(More)
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