Research On Key Technologies Of Dynamic Spectrum Sharing Based On Auction

In recent years,with the rapid development of communication technology and the rapid growth of wireless communication services,the scarcity of spectrum resources has seriously affected the development of wireless communication technology.Moreover,the currently allocated spectrum resources have not been fully utilized.This situation has led to the emergence of cognitive radio technology.It can detect idle spectrum through spectrum sensing technology and dynamically allocate it to the cognitive users in need.In this way,the utilization rate of the spectrum is improved.Cognitive radio technology is particularly important in solving the problem of spectrum resource shortage.There are four key technologies:spectrum sensing,spectrum decision-making,spectrum sharing,and spectrum migration.This thesis mainly conducts research and analysis on spectrum sharing and spectrum sensing technology,and the main innovative work as follows.1)This thesis proposes a real group-buying auction model based on spatially heterogeneous spectrum to improve spectrum efficiency.Different from traditional group buying auctions,the process of cognitive user grouping is not only related to the interference between cognitive users but also related to economic benefits.This thesis combines cognitive user grouping with auction theory,perform multiple virtual groupings to form a final stable group,and conduct a final auction to determine the winning cognitive users.The spectrum multiplexing method is used inside the packet to improve the spectrum efficiency.In addition,this thesis also proves that the stable group formation process is convergent.Theoretical analysis and simulation results prove that the scheme satisfies the three characteristics of economics:authenticity,personal rationality and budget balance,and is superior to the existing mechanism.2)This thesis proposes a group-buying auction model based on the perceptual auction compromise.In the case of spectrum uncertainty,it seeks to find more available spectrum to improve auction efficiency.Under the premise of ensuring the normal work of authorized users as much as possible,seek cognitive user perception time and Balance of auction time.Theoretical analysis and simulation results show that there is an optimal perception time to maximize the utility of the auctioneer.This thesis mainly conducts in-depth research on the spectrum sharing technology in cognitive radio,and proposes some new spectrum sharing models,which greatly improves the spectrum efficiency.