The Wireless Spectrum Resource Allocation Algorithm Based On Soft-Frequency Reuse

5G communication system is composed of Dense Heterogeneous Networks,Massive Networking and MIMO technology,which will bring huge performance gains on the transmission rate,system capacity,network delay,power consumption and etc.In order to achieve the performance,there are still many problems to be solved,the spectrum utilization is one of the key points.From the current research,Soft Frequency and Dynamic Spectrum Access is very effective to improve the utilization of spectrum technology:soft frequency reuse can bring the system capacity in the spatial scale of the upgrade,dynamic spectrum access technology in the time dimension can also improve spectrum utilization.Based on the soft frequency reuse technology,a dynamic spectrum multiplexing scheme is designed.In the scheme,based on the method of power control in the soft frequency reuse,the power control parameter k is designed according to the selection of the Power Density Limit in the multi-level soft frequency reuse technology.And by adjusting the value of k to improve the capacity of the cell edge,which could lead to achieve the purpose of improving the spectrum utilization.The relationship between the value of K and the signal-to-noise ratio and spectral efficiency of edge users is analyzed and discussed.On this basis,according to the principle of dynamic spectrum access in vertical spectrum sharing and spectrum overlay,the user of non authorized users in the authorized user is not authorized to access the spectrum access frequency,and made by the authorized user access strategy.Based on this,a SRA-SFR algorithm is proposed.The algorithm is based on the results of spectrum sensing and the signal power of each frequency band,and the transmitted power is controlled by the power control parameter k after the frequency spectrum.After the frequency spectrum of the current use of continuous spectrum sensing,until the discovery of authorized users to access the current frequency band and frequency spectrum based on the results of the re selection of frequency band access.In order to test the feasibility of the algorithm,a dynamic spectrum access hardware experimental platform based on NI USRP 2932 is built.Using LabVIEW to complete the software design,and tested in the open and indoor scenes.The experimental results show that the algorithm can achieve the dynamic frequency selection function in two typical application scenarios,and proofed that the parameter k could help improve the SNR of cell-edge users.