分布式天线系统中的系统上行中断概率分析

System Uplink Outage Probability Analysis in Distributed Antenna Systems

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。

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.