Research On Performance Of Collaborative Spectrum Sensing System Based On P - Th Power Detector

Along with the rapid advancement of today’s information society, the use of various wireless communication products is more and more widely. However, we know that wireless communication spectrum is limited. In addition, the fixed allocation strategy for radio spectrum resource made the radio spectrum utilization low. In recent years, spectrum sensing technology, as the most primary technology, become the focus of the scholars’research. In this paper, we study the centralized intra-cooperative spectrum sensing technology based on P-th detector, using a more practical system model and rigorous derivation, optimize the total detection error rate and cognitive network’s throughput.This paper firstly introduces the basic knowledge of spectrum sensing technology and the classification. Considering the simple system model, we mainly study the transmitter signal detection technology based on the energy detector. Secondly, we introduce the concept of cooperative spectrum sensing technology and its’ classification. It can make up for the shortcomings of local sensing technology. With introducing the fusion rule of cooperative spectrum sensing technology, we mainly discuss the fusion of three hard way with "OR","AND" and "MARJORY" in false-alarm probability and detection probability, and make theory derivation and the simulation analysis. Finally, we research the model of cooperative spectrum sensing system based on P-th detector and do optimization on total error probability and throughput of the cognitive network.The main innovation is using more practical system model with P-th detector and jointly performance optimization in this paper. In considering the OR, AND and MARJORY fusion rule, we joint optimize P-th power of P-th power detector, optimal sensing threshold^and minimal determining number of usersc to minimize the total error probability and find best fusion rule. On the premise of protecting licensed user1communication without interference, we take the objective function of cognitive network throughput, and joint optimize P-th power of P-th power detector and the optimal sensing timeτ to make the throughput of the cognitive network maximum. Therefore, this system can guarantee a high detection probability for licensed user’network, and can maximize cognitive network throughput to improve spectrum efficiency.