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Research on Efficient Cooperative Spectrum Sensing

Author: PengXiao
Tutor: ZhuJinKang
School: University of Science and Technology of China
Course: Communication and Information System
Keywords: Cognitive radio Cooperative spectrum sensing Aware node selection Judgment fusion Iterative search
CLC: TN92
Type: Master's thesis
Year: 2010
Downloads: 195
Quote: 2
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Abstract

With the development of wireless communication technology, more and more prominent the contradiction between the communication performance and resource overhead. Spectrum scarcity of resources and the inefficiency of the static spectrum allocation policy is increasingly clear, in the context of the emerging new communication system, improve the spectrum utilization has become a core issue to be solved by wireless communication. Cognitive radio technology proposed a new solution, the key idea is to make wireless communication devices can be found within the authorized frequency spectrum band spectrum holes \of authorized users under the premise of opportunistic access to licensed spectrum, which can significantly improve the utilization of the spectrum resources, effectively alleviate the scarcity of spectrum. Even if there is a contradiction between performance and efficiency in the field of cognitive radio. Spectrum sensing cognitive radio is a very important research topic, accurate perception of non-authorized users on the premise of using unlicensed spectrum; spectrum resources as an important spectrum sensing technology, cooperative spectrum sensing is recognized to improve the perceived reliability of the results effective way, but each time in the cooperative spectrum sensing perception process involves a number of non-authorized user participation, perceived performance improvement comes at a high system resource consumption at the expense of. The main contribution of this paper is to study how to achieve efficient and robust cooperative spectrum sensing, perception of acceptable results with minimal resource consumption consideration accuracy, but also can contain and resist some illegal competitive behavior of spectrum resources. The third chapter an ideal situation, all non-authorized user's perception accuracy (including the probability of false alarm and missed alarm probability) the same efficient cooperative sensing strategy. This chapter first presented the main way to improve collaboration efficiency and efficient cooperative sensing system framework based on improved Chair-Varshney fusion sentencing guidelines. The premise that the given target perceived accuracy can be improved Chair-Varshney guidelines need to be involved in the perception of the number of non-authorized users, and then selected by a random selection unauthorized users involved in perception, and perception of the results reported to the judgment fusion center for the final judgment. Simulation results show that only need a small number of non-authorized users can reach the target perceived precision in order to achieve savings of resources and efficiency. Chapter unauthorized users perceived difference in accuracy cooperative sensing strategy. This case is difficult to obtained by theoretical derivation involved in the perception of non-optimal number of authorized users, but this chapter by their estimated historical judgment on each of the non-authorized user of the correct rate and manner of use of the iterative search and select the most suitable for a non-authorized user participation perception, in order to achieve accuracy in order the smallest perceived number of users to achieve the goal perception. Simulation results show that this method of cooperative sensing the target sensing accuracy to meet certain requirements at the same time, minimize the number of users involved in perception, thereby reducing the consumption of resources of the system; addition, the method for lying about has a faster convergence characteristics; The perception of malicious nodes also has some filtering capability.

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