The Research Of Ultra-Dense Heterogeneous Network Based On Full-duplex Transmission

With the rapid development of the mobile internet during the past decades,users are also in accelerative demand for data traffic and communication bandwidth.The new network architecture is one of the important technologies in the fifth generation of mobile communication(5G),which can meet the user's demand for high-speed communication.Second,full-duplex(FD)technology is also a candidate mainly technology that can greatly improve the bandwidth utilization of wireless self-backhauling networks.This thesis mainly studies the performance of ultra-dense heterogeneous network based on FD transmission.The main work of the dissertation includes:(1)This paper introduce the 5G network architecture and evolution plan firstly.Then outlines some of the key technologies 5G will adopt,including mobile edge computing(MEC),self-backhauling,massive MIMO and FD technology.(2)Aiming at an ultra-dense FD-based heterogeneous network model,the system performance in single-antenna mode is analyzed.Firstly,the average link rate of the system is deduced by stochastic geometric model,and then the multi-cell simulation of the system is carried out.Finally,the sum rate performance of the ultra-dense heterogeneous network model in FD and HD transmission modes is compared by simulation results.(3)The performance of ultra-dense heterogeneous network system based on large-scale MIMO is researched,and the co-channel interference between microcells was also considered.The macro base station transmitter uses MRT to precode the signal with multiple antennas.Then the difference between the downlink sum rate of the backhaul and the access link are compared by simulation.Simulation results show that the proposed scheme has a larger backhaul link sum rate than the access link,and as the number of macro base station antennas increases,the backhaul link rate also increases.