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Quadratic Greedy Algorithm for Multichannel Access in Cognitive Radio Network
| International Journal of Computer Applications |
| Foundation of Computer Science (FCS), NY, USA |
| Volume 91 - Number 15 |
| Year of Publication: 2014 |
| Authors: Soumaya Dahi, Sami Tabbane |
10.5120/15958-5331
|
Soumaya Dahi, Sami Tabbane . Quadratic Greedy Algorithm for Multichannel Access in Cognitive Radio Network. International Journal of Computer Applications. 91, 15 ( April 2014), 28-33. DOI=10.5120/15958-5331
Abstract
Spectrum handoff is one of the main issues in cognitive radio networks. Spectrum handoff occurs when the owner of the spectrum or the primary user reclaims a channel already used opportunistically by a secondary user. Such handoff becomes more frequent especially in case of multichannel access since that in a wider band, a PU is likely to reclaim a part of the band more quickly. This process has a negative impact on the performance of SU transmission in terms of delay and link maintenance. In this paper, the problem of minimizing the secondary user handoff process because of primary user activity is underlined. An analytical formulation based on knapsack problem is established and a new spectrum selection scheme is proposed. The main idea is to maximize jointly the holding time and the achievable throughput of the selected channels. The performance of the proposed access model is investigated through numerical simulations.
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