超宽带室内多径信道随机分析模型

使用随机分析方法研究超宽带(UWB)室内多径信道.从UWB信号的基本传播特性出发构建随机分析模型的物理基础.假设UWB信号的多径分量在信道中的传播轨迹是某个随机过程的样本,把UWB信号在信道中传播时发生的传播损耗,和与散射体发生碰撞产生的损耗分开,建立UWB室内多径信道的随机分析模型,包括完全随机的布朗桥模型和有约束的布朗桥模型.使用有约束的布朗桥模型对假设的有8个散射体的不完全随机分布室内环境,以及有金属网格玻璃门反射的走廊环境进行仿真,得到了具有明显成簇现象的UWB信道的功率延迟分布.仿真结果与已公布的UWB信道实测结果具有很好的相似性.

Stochastic calculus model for UWB indoor multipath channel

Stochastic calculus method is employed for modeling of Ultra-wideband (UWB) indoor multipath channel. A physical fundament of stochastic calculus model is constructed from several fundamental propagation properties of UWB signals. Taking a UWB multipath as one sample function of a stochastic process, the energy loss of a signal was divided into two parts: the propagation loss and the reflection loss, then a stochastic calculus model for UWB indoor multipath channel can be developed including the Brownian Bridge Model (BBM) and the Bounded Brownian Bridge Model (BBBM). For an assumed environment with 8 obstacles, and a corridor of two glass doors with a metal grid inside, respectively, several characteristic parameters of UWB indoor multipath channel, such as amplitude responses, reflection index of every mulitipath, and power delay profiles (PDPs) are obtained from BBBM. The simulation results are good in accord with available measured data.