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Framework of WSN for wideband spectrum sensing and clustering algorithm

ZHANG Jianzhao1,2,YAO Fuqiang2,LIU Yongxiang2,KONG Deyang1,2,CAO Long1,2(1.College of Communications Engineering,PLA Univ.of Sci.& Tech.,Nanjing 210007,China; 2.The 63rd Research Institute of PLA General Staff Headquarters,Nanjing 210007,China)  
For the wide-band spectrum sensing requirement in dynamic spectrum management and spectrum monitoring,a wireless sensor network framework for wide-band spectrum sensing was proposed.Through clustered network structure,frequency division based cooperative sensing and cooperative sensing result processing scheme,the framework aims to achieve efficient and precise spectrum sensing.Specifically,the clustering algorithm following this framework was researched and a Mission Spectrum Oriented Clustering algorithm based on Distributed Affinity Propagation(MSOC-DAP) was proposed.Through distributed message exchange and network structure information accumulation,the nodes sensing the same band were clustered into fewer clusters with fewer inter-cluster SNR difference.Extensive simulation result shows that the generated cluster numbers of the proposed algorithm increase linearly with nodes numbers in the network and the generated cluster structure performs better than the existing algorithms on SNR mean standard deviation and mean energy difference.These demonstrate the preference of MSOC-DAP on expansibility,supporting sensing result fusion,and prolonging the network longevity.
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