Performance Analysis of a Cognitive Radio Network with Imperfect Spectrum Sensing

In this paper, we use stochastic network calculus to analyze a cognitive radio network, where influences of imperfect spectrum sensing and different retransmission schemes are considered. In particular, stochastic arrival curves for spectrum sensing error processes are derived firstly, based on which stochastic service curve for each class of users is obtained under different retransmission schemes, including without retransmission, retransmission until success and maximum-N-times retransmission. Then backlog and delay bounds for primary and secondary users are derived. Finally, numerical results are shown for different types of traffic, where the influence of different retransmission schemes is further discussed.