Research On Cooperative Energy Detection Of Double Threshold In Cognitive Network

In order to adapt to the increasing rate of power network and service quality requirements, 230MHz band is mainly used to achieve communication in the power system, the sharing technology of spectrum in 230MHz cognitive network research is a hot topic nowaday.During the past decades of wireless communication’s rapid development, cooperative relay technology was frequently mentioned,which covers the wide area of today’s communication field and can provide a reliable communication transmission mode. The purpose of the technology is carrying out the transmission source information by cooperating communication among a plurality of relay nodes.In this paper, we mainly discuss the different aspects of spectrum sensing. Since energy sensing does not need to know the prior information of authorized users, which can reduce the complexity of implementation.So we use energy detection algorithm and cooperate method with the help of relay technology in sensing stage. In order to get a larger communication capacity, and increase the amount of data collaboration results, we make the final decision to assess the results. In the cooperative relay, the relay selection scheme based on selective relaying and the fixed relay is used to set up two thresholds of energy sensing which are according to the channel condition, and the energy information is transmitted to the decision center in the double threshold section. In the decision center, in consideration of the relay and the destination node’s signal-to-noise ratio, the final threshold of energy detection is determined, and the energy detection results from each sub-decision center are statistically calculated. Then, the decision result of whether the main user occupies the channel is obtained, User sub-users achieve efficient spectrum sharing under low interference conditions.The system-level simulation platform based on System Vue is built,Finally, the simulation results show that the communication capacity in the 230M system is greatly improved by using the proposed scheme.