| As a national public resource,radio spectrum is also an important national strategic resource.With the development of communication technology,the demand for wireless communication is increasing rapidly in mobile communication,wireless network service,and military application,which leads to the shortage of radio spectrum resources and the increasingly severe use situation.How to make the use of spectrum more scientific and reasonable,this is a major issue facing.Spectrum awareness technology can independently find "spectrum holes" to improve spectrum utilization.Software Radio(SDR)technology is flexible and simple,cost-effective,providing a new way of thinking for spectral awareness monitoring and analysis of customized radio signals in the future.In this paper,on the basis of the research on spectrum sensing technology,set up the SDR experimental platform,designed the energy detection based on fast Fourier transform spectrum sensing algorithm,based on the USRP hardware platform and the Lab VIEW development environment to complete the radio signal acquisition,spectrum analysis,data access and read,spectrum scanning,energy detection program design work,Through theoretical derivation and experimental simulation,the influence of noise uncertainty,sampling number and other factors on the performance of energy detection is analyzed.Using the existing conditions,this paper scans and collects the FM radio frequency band,analyzes the occupation of its spectrum,looks for the target signal,finds the spectrum hole,effectively perceives the existence of authorized users,and gives the frequency usage of the region.At the same time,the change of the decision threshold size for different signal power and judgment threshold is tested by intercom and USRP2920,so that the relationship between the judgment threshold and the signal-to-noise ratio is obtained.After testing,the various functional modules of this system work steadily,and the perceived results are in line with the actual situation. |
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