Design of energy detection based on selection diversity combining in cognitive radio

This paper presents the design technique of the selection diversity combining based spectrum sensing in cognitive radio networks. In general, the selection diversity combining scheme requires period to choose an optimal element, and spectrum sensing also requires period to detect a target signal. Because spending a long time for the selection and sensing increases the accuracy of the selection and signal detection, respectively, these periods must be considered when developing selection diversity combining based spectrum sensing. Therefore, the required period for spectrum sensing based on selection diversity combining is the summation of the selection and sensing periods, and the selection diversity combining based sensing must consider the period. We have presented the selection diversity combining based spectrum sensing considering on these period, and however, the effect of the length of these periods on the sensing performance has never discussed. In this paper, we discuss the design technique of these period for the improvement of the sensing performance. Numerical examples are shown to validate the effectiveness of the presented design techniques.