Research On WiMAX Simulation System And Interference Coordination Technology Based On IEEE802.16e Standard

WiMAX, based on the IEEE802.16e standard, is a WMAN (Wireless Metropolitan Area Networks) technology.Due to the applications of OFDMA ,MIMO and other advanced technologies,WiMAX has become a leading solution for wireless broadband access.WiMAX has some salient features, such as high data throughput, flexible resource allocation,scalable architecture and supporting mobility.To improve spectrum efficiency, full frequency reuse is supported in WiMAX network. However, users at the cell edge may suffer low connection quality because of inter-cell interference (ICI) in full frequency reuse deployment.Although OFDMA provides orthogonality among the intra cell users, it is helpless for the ICI.As an effective way to mitigate ICI, interference coordination has become a hotpot of research.This thesis mainly focuses on the further study of interference coordination.Firstly, IEEE802.16e system and some basic concepts are introduced.A WiMAX system level simulation platform is designed and established.The interference coordination techniques ,classified into SFR(Soft Frequency Reuse) and FFR(Fractional Frequency Reuse), are described in detail.A traditional time division FFR scheme is applied in system for performance simulation.In the traditional time division FFR scheme,interference can be found in the full frequency reuse region.To suppress this part of interference,a improved time division FFR scheme is proposed and analyzed.In this improved FFR scheme,resource allocation is based on time domain, frequency domain,and spatial domain.The simulation results show that interference is suppressed, as well as data throughput and spectrum efficiency are improved.