随机桥过程建模超宽带多径传播信道

Applications of Stochastic Bridge Processes for Modeling UWB Wireless Propagation Channels

使用随机桥过程研究超宽带(UWB)多径传播信道。首先介绍随机桥过程的理论基础,然后引入能够建模无线信道传播特性的基本随机变量。给出随机桥过程建模UWB多径传播信道的两个假设条件,使用布朗桥过程建模UWB无线传播信道,得到有约束布朗桥信道模型,同时还给出使用随机桥过程方法建模UWB室内多径信道特性的算法和伪代码。使用该信道模型对典型室内传播环境进行仿真分析。仿真结果表明,得到的UWB信道的特性和使用一致性劈绕射理论(UTD)方法得到的信道特性结果非常相似,信道特征参量的取值与经验参数相符。

Stochastic bridge processes are employed to analyze the characteristics of UWB multipath propagation channels in the current research. Stochastic bridge processes are first introduced. Then the basic random variables constructed from the samples of stochastic bridge processes are described. Under two assumptions for using Stochastic bridge processes to modeling UWB muhipath propagation channels, Brownian bridge processes are utilized to model UWB channels, from which a bounded Brownian bridge model （BBBM） for UWB indoor multipath channels is obtained, Modeling algorithm and its pseudo code are described for UWB channel properties using stochastic bridge processes, The propagation properties of classical indoor propagation environment are studied. The simulation results demonstrate that the BBBM can obtain similar channel properties to the results of UTD methods. Some characteristic parameters of UWB channels obtained from BBBM correspond well with the empirical values,