Design And Implementation Of Spectrum Monitoring System Based On USRP Platform

The research subject of this thesis is funded by State Grid’s science and technology project research on key technologies of 4G multi service bearer for power mobile Internet applications.The main work of this thesis is the design and implementation of spectrum monitoring terminal.Based on design requirements of monitoring system,the overall scheme of the monitoring system is designed and implementation scheme of monitor terminal based on GNU Radio and USRP is analysed in detail.Then the hardware and software modules of monitoring terminal are designed and implemented,and the developed monitoring terminal is tested running with control center.Besides,an improved collaborative spectrum sensing algorithm based on double-threshold energy detection is introduced.The thesis is divided into six chapters as follows.In Chapter 1,the background and significance as well as the relevant knowledge of cognitive radio are introduced.Then the architecture of this thesis is described.In Chapter 2,the application scenario of the spectrum monitoring system is analyzed,and the design scheme of the monitoring terminal is introduced according to the overall scheme of spectrum monitoring system.In Chapter 3,the hardware implementation scheme of spectrum monitoring terminal based on USRP is given,which includes USRP platform,antenna module,GPS positioning module and 4G communication module.Then the hardware platform of the monitoring terminal is built.In Chapter 4,the software implementation scheme of spectrum monitoring terminal based on GNU Radio is provided,which includes spectrum acquisition module and communication module.Then the main thread,data acquisition thread and heartbeat packet thread of monitoring terminal are realized.In Chapter 5,according to the test scenarios of the monitoring terminal,the function of the implemented monitoring terminal and the performance of the terminal combined with the control center are tested.In Chapter 6,an improved collaborative spectrum sensing algorithm based on double-threshold energy detection is proposed.The theoretical analysis and simulation result show that the algorithm can achieve high detection probability.