| Summary: | 碩士 === 國立交通大學 === 電子工程系所 === 96 === The mobile WiMAX based on IEEE 802.16e standard which provides high speed transmission over large area has been adopted as one of the candidates of next generation communication systems. But, with higher demand of multi-media application, high date rates and high bandwidth are necessary for wireless transmission. Consequently, the Multiple Input Multiple Output (MIMO) and Adaptive Antenna System (AAS) will be the solutions of future wireless system. In this thesis, we apply Spatial Division Multiple Access (SDMA) mechanism enabled by AAS on mobile WiMAX to investigate the system level performance analysis when poor RF condition users are served with beamforming. Besides support poor users, we also consider the Quality of Service (QoS) requirements of mixed traffic services. As a result, we build a simulation platform for mobile WiMAX with basic Radio Resource Management (RRM) and SDMA-enabled MAC layer. We adopt a simple two stages scheduling algorithm for QoS guarantee and SINR enhancement for poor users. In the simulation result, the cell capacity can be increase significantly because of the reduction of outage probability. With beamforming, the co-channel interference is suppressed and SINR is enhanced under the same power budget so that the transmission quality is promoted. The simulation results also shows that when two stage scheduling algorithm for SDMA is applied, the system performance is still improved significantly under serious co-channel interference.
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