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The Internet of Things (IoT) is called the world’s third wave of the information industry.As the core technology of IoT,Cognitive Radio Sensor Networks (CRSN) technology can improve spectrum utilization efficiency and lay a solid foundation for large-scale application of IoT.Reliable spectrum sensing is a crucial task of the CR.For energy detection,threshold will determine the probability of detection (Pd) and the probability of false alarm Pf at the same time.While the threshold increases,Pd and Pf will both decrease.In this paper we focus on the maximum of the difference of Pd and Pf,and try to find out how to determine the threshold with this precondition.Simulation results show that the proposed method can effectively approach the ideal optimal result.
The Internet of Things (IoT) is called the world’s third wave of the information industry. As the core technology of IoT, Cognitive Radio Sensor Networks (CRSN) technology can improve spectrum utilization efficiency and lay a solid foundation for large-scale application of IoT .Reliable spectrum sensing is a crucial task of the CR. For energy detection, threshold will determine the probability of detection (Pd) and the probability of false alarm Pf at the same time. Whilst the threshold increases, Pd and Pf will both decrease. In this paper we focus on the maximum of the difference of Pd and Pf, and try to find out how to determine the threshold with this precondition. Simulation results show that the proposed method can effectively approach the ideal optimal result.