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中文摘要：
分布式无线移动通信系统中，远端天线单元的选择方案将影响移动通信系统的性能。该文基于软切换中激活集的思想，提出了一种远端天线单元动态选择模型，模型依据平均接收信号强度阈值以及延迟计数器确定激活集状态，而阈值由移动台运动速度决定。文章对模型作了详细的理论分析，并经过仿真证明了模型的合理性。
英文摘要：
In distributed radio mobile communications system, Remote Antenna Unit （RAU） selection scheme will influence the system performance. In this paper, a selection model is presented for RAU selection in distributed radio system based on soft handoff theories. The selection strategy is based on received signal strength （RSS） measurements and described as a multiple state Markov chain. The RSS threshold is determined by velocity of MS. Performance analysis results show that numeric data achieved from the model are in good agreement with simulation results, which verifies the validity of the model.
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