微蜂窝环境中无线接收信号的特性分析

Characteristic Analysis of the Wireless Receiving Signals in Microcell Scenarios

微蜂窝环境中无线接收信号的特征分析,本质上就是要分析和计算传播路径和多波干涉对接收信号特征的影响.首先,建立了基于虚拟源镜像法的传输路径搜寻算法,确定从源点到场点的全部可达路径,给出了最多、最少路径下的收发位置组合,根据电波传播路径总结了电波传播的规律,给出了算法的误差来源以及稳定度分析,分析了角度量化误差产生的原因,分别给出了基于等效照射角和基于出射路径最小邻域的两种角度量化原则;通过对初始出射角引入在[0,2π]上均匀分布的随机相位,构建随机性传播模型,建立合成波振幅,使用参数估计方法获得了合成波振幅的概率密度函数;在宽带信号条件下,分析了合成波的包络统计特性,基于传播主径的概念,提出了一种基于相关性的可达路径分类方法,通过对一簇路径的振幅和相位引入随机构建了新的随机传输模型,构建了密集环境下的近似信道传输模型.

The analysis of the wireless receiving signals in microcell scenarios is to researching on the impact of the propagation path and multipath interference for the receiving signals. Firstly, a propagation path searching algorithm is established and all paths are obtained through simulation and propagation patterns are summarized according to the available paths Souce of error and stability of the algorithm are analyzed as well： Besides, considering the angel quantization error, two angle quantization methods of Equivalent-Radiating-Angle （ERA） and Minimum-Radiating-Neighbourhood （MRN） are proposed Secondly, random phase for the angle of emergence is introduced to set random propagation model and the density function of the synthesis signals is also given based on parameter estimation In the end, the envelope statistic characteristic of composite wave is analyzed in a widebband circumstance. Besides, the concept of main propagation path is proposed and a new random propagation model is set through introducing random factor on the magnitude and phase, which gives possibility to construct rank channel propagation model in the cluttered enviroment.