分布式天线系统中的系统上行中断概率分析

中断概率是无线通信系统的一个重要指标。该文针对分布式天线系统中的系统中断概率问题进行了研究。首先，建立了包含路径损耗、阴影衰落和瑞利衰落的复合信道模型；然后，在该信道模型下推导出给定移动台位置时的信噪比；接着，基于选择合并策略，分析出给定移动台位置时系统上行传输的中断概率表达式；最后，考虑到小区内移动台任意分布特点，文章给出系统上行中断概率闭合理论表达式。仿真结果表明，所提的系统上行中断概率理论表达式与仿真结果十分吻合。

System Uplink Outage Probability Analysis in Distributed Antenna Systems

Outage probability is an important parameter in wireless communication systems. This paper studies the system outage probability in the Distributed Antenna Systems (DAS). Firstly, this paper establishes a composite channel model which takes into account three factors such as path loss, lognormal shadowing and Rayleigh fading. Based on the established channel model, the Signal-to-Noise Ratio (SNR) of Mobile Station (MS) over a given position is derived. Then, an uplink transmission expression of the outage probability for the MS over a given position is derived by employing the selective combining. Further, considering the distribution of MSs in the cell, a closed-form expression of the system outage probability is obtained. Numerical results show that the closed-form expression of the system uplink outage probability can match with the simulation results very well.