A 1-Persistent Based Spectrum Sensing Among the Stochastic Cooperative Users in the Presence of the State-Variable Primary User

Abstract

The quality of energy detector is quite challenging when the system parameters are not stable. On the other hand, in a cognitive radio network, primary users are licensed to use the desired radio spectrum band(s) and the throughput of the primary network has the highest priority to be kept satisfied. Therefore, it is quite important to secure the quality of primary service to a certain level, and it is worthless to blindly improve the throughput of the secondary network without taking its possible effects on the primary throughput into account. Hence, the mentioned issues motivate us to enhance the total throughput of the system when it suffers from an unstable primary network, due to a medium-traffic rate, and a random density of the secondary users, due to a stochastic-modeled secondary network, at the same time. By introducing a 1-persistent method in a cooperative spectrum sensing scheme, we show how effectively it can improve both primary and secondary throughputs, resulting in higher total throughput of the system.