Performance Evaluation of the Opportunistic Spectrum Access in a Cognitive Radio Network with Imperfect Sensing

摘要

Cognitive radio networks have emerged as a promising technology to shift the actual paradigm of spectrum scarcity by allowing the cognitive users (secondary users) to use the licensed spectrum on an opportunistic basis. A continuous-time Markov chain (CTMC) can be used to model the opportunistic spectrum access (OSA) in a cognitive radio network with imperfect sensing (false alarms and misdetections). In this paper, an analytic model is developed and the performance of the system is evaluated and the numerical results are presented in terms of capacity (average number of calls completion per time unit), blocking probability, force termination probability and spectrum utilization.