Design And Implementation Of Coorporative Spectrum Sensing System Based On USRP

The research subject of this thesis is supported by National Natural Science Foundation Project--research on key technologies of cognitive wireless sensor network(No.61372104).The main research content is the proposal of cooperative sensing algorithm and the design and implementation of a cooperative spectrum sensing system.According to the design requirements,a sensing algorithm which joints energy and spectrum detection under noise uncertainty is proposed,and system platform is builded based on GNU Radio and USRP.Besides,based on the proposed algorithm,both dynamic spectrum sensing and data transmission are implemented on the system platform.The thesis is divided into six chapters as follows.In Chapter 1,the research background and significance as well as the current research status of cognitive radio at home and abroad are introduced.Then the main contents and architecture of this thesis are described.In Chapter 2,the related technology and research of software radio are given,and then the cognitive radio technology is analyzed.Based on the application scene and design requirements of this paper,the architecture of cooperative spectrum sensing system is designed,which lays a foundation for the development of the system.In Chapter 3,the selection of software radio development platform is introduced.Then,combined with the requirements of system design,the software and hardware platform of cooperative spectrum sensing system is built by using GNU Radio and USRP.The system structure and related functions of GNU Radio and USRP are also deeply analyzed and discussed.In Chapter 4,the model of energy detection is introduced,and the cooperative spectrum sensing is analyzed.Then an improved sensing algorithm which joints energy and spectrum detection under noise uncertainty is proposed.The proposed algorithm and other energy detection algorithms are compared by using MATLAB simulation experiment.The results show that the proposed algorithm has better detection performance.In Chapter 5,an implementation scheme of a cooperative spectrum sensing system is introduced,and the functions of cooperative spectrum sensing and data transmission are conducted on USRP platform.First,the building process of the cooperative spectrum sensing system is described,including the installation of GNU Radio,the test of the experimental platform and the solution of the common problems.Then,the algorithm is implemented on the built platform,and the experimental results are analyzed in detail,which verifies the superiority of the proposed algorithm.In Chapter 6,the summary and prospect are given.