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In this paper, we study the VoIP capacity in cognitive radio system. As the cognitive user, VoIP packets arrival from a poisson process and use the wireless channels transparently. We formulate the whole dispose procedure as a birth and death processes, and establish preemptive multi-channel model under the consideration of delay and dropping rate(More)
In this letter, the voice over IP (VoIP) capacity in Cognitive Radio system is studied with single and multiple channels. A special Cognitive Radio (CR) system is used, the Cognitive radio system adopt the frequency of near 700M Hz, a wireless channel can be modeled as a two-dimensional discrete-time Markov chain. The traffic of a single VoIP user is(More)
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