The Research On Spectrum Detection Technology Based On Coalition Formation Theory In Cognitive Radio

With the increasing popularity of wireless communication services,people's demand for services is also growing,the lack of spectrum resources and the restrictions of traditional static spectrum access technology become more prominent.In such an era of extraordinary frequency of resources,how to meet the additional business needs,use the original spectrum of resources more effectively,and introduce new bands,is a hot research now.Cognitive radio is an emerging technology to solve the low utilization rate of spectrum resources.In order to improve the detection performance of secondary users and reduce the interference,this paper proposes a double threshold energy detection optimization algorithm for non-cooperative detection and a coalition formation games algorithm for cooperative detection.In the aspect of a single secondary user to improve the detection performance,a double threshold energy detection optimization algorithm based on dec ision fusion is proposed in this paper.The simulation results show that the optimized algorithm has a significant improvement compared with the non-optimized performance.When the SNR is constant,the optimization algorithm is divided into 10 groups of performance over the traditional algorithm performance of 15.4%.And when the fP is constant,the optimization algorithm is 6.5% higher than the traditional algorithm performance.After study the joint spectrum sensing and access algo rithm,and on the basis of the algorithm,this paper proposes coalition formation games algorithm.The algorithm allows the secondary user to decide whether to join or leave the coalition based on the average time to find the idle channel and the total revenue available for the average capacity.Members of the coalition can work together to optimize their overall detection and access performance.By analyzing the simulation results,the performance advantage is 56.25% when the number of cognitive users is N = 20 and 63.5% when the number of authorized channels is K = 20 relative to the non-cooperation.The research of this paper can provide theoretical support for the further study on cognitive radio spectrum detection,and provide the corresponding reference for the application of cognitive radio in 5G.