Capacity Analysis of VoIP Service in Cognitive Radio System

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 constraints to analysis the capacity of VoIP service in the cognitive radio system. The theoretical capacity can be calculated by the system model, furthermore a real simulink system is established by matlab to prove the correctness of our theoretical values.