Abstract
Cognitive radio technology improves the utilization of limited spectrum resources when wireless networks coexist. Using this technology, the spectrum holes in the frequency band of licensed users can be temporarily allocated to unlicensed users. This letter analyzes the opportunistic dynamic spectrum allocation method based on selecting the largest available spectrum hole to have the maximum possible transmission rate. This analysis proposes a theoretical model to find the probability distribution of the length of the largest available spectrum hole. The theoretical model works for any given number of total channels in the licensed frequency band. Numerical and simulation results confirm the accuracy of the proposed model.
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