A soft cooperative spectrum sensing in the presence ofmost destructive smart PUEA using energy detector

摘要

Recently, the growth of Internet of Things (IoT) and its remarkable impacts on human well-beingrnlife style are deniable.On the connectivity side, IoT is highly related to Wireless Sensor Networkrn(WSN) concept. The key elements include the data, which is machine-produced, specifically byrnsensors, and the data communication through connectivity technologies.Onthe security side, primaryrnuser emulation attack (PUE) is one of thewell-defined attacks in cognitive radio (CR)–basedrnWSN. Here, we investigate a smart primary user emulation attacker that has the most destructiverneffect on the spectrum sensing unit of cognitive radio users. To deal with this attack, a softrncooperative spectrum sensing using an energy detector is proposed. In the proposed method, thernvalues of sensing information of each secondary user are sent to a fusion center.Once the valuesrnare received, they will be combined with some appropriate coefficients in order to minimize spectrumrnsensing probability of error for a given probability of false alarm. The coefficients are thernvariables of a constrained optimization problem. Based on simulation results, our method has arnlower error probability in spectrum sensing in comparison to hard combination schemes (eg, ORrnrule) and soft combination schemes (eg, CSINR method).