Joint Optimization of Sensing Period and Sensing Interval in Cognitive Radio Networks
Zhu Qi · Journal of Nanjing University of Posts and Telecommunications · 2011
Sensing/monitoring of spectrum-availability has been identified as a key requirement for dynamic spectrum allocation in cognitive radio networks(CRNs).Sensing duration and sensing interval are two significant parameters associated with spectrum sensing,which directly affect the detection probability of available spectrum and the collision probability of the primary and secondary users.In this paper,a two-dimensional single-objective optimization problem of sensing period and sensing interval is proposed under the constraint that the primary users are sufficiently protected.Based on the energy detection sensing algorithm,the mathematical model of joint optimization is given.We present the approach of solving the sensing period and sensing interval optimization problem which makes the maximum utilization of spectrum for the secondary system.Simulation results show that the spectrum utilization increases at first and decreases then as the sensing interval and the sensing period increase.So there exists a set of optimal values of sensing interval and sensing period to maximize the spectrum utilization of the cognitive networks.