非视距环境下超宽带信号多重绕射仿真研究  

Simulation of Multiple Diffraction for UWB Signals under NLOS Environment

作　　者：韩涛[1] 宋建勋[1] 王红成[1] 

机构地区：[1]东莞理工学院电子工程学院,东莞523808

出　　处：《系统仿真学报》2015年第6期1183-1189,共7页Journal of System Simulation

基　　金：国家自然科学基金(61308019)

摘　　要：利用时域一致性绕射理(UTD)和物理光学(PO)的方法来仿真非视距环境下超宽带(UWB)信号多重绕射传播特性。由于该方法利用一组简单的递推关系来代替一致性绕射理论中复杂的斜率绕射项,从而提供了一种简化的基于时域一致性绕射理论的多重绕射分析方法。利用上述方法推导了著名的Bertoni模型的时域冲激响应,利用卷积运算可以简便地预测仿真环境下接收点的超宽带信号。数值结果表明,这种基于时域UTD-PO的分析方法不仅能够用来准确地分析多重绕射模型而且还能够明显节省运算时间;相比楔形障碍物,圆形障碍物对接收点波形的影响较小。A time domain(TD) solution based on uniform theory of diffraction-physical optics(UTD-PO)was presented to analyze the multiple diffraction propagation characteristics of UWB signals under NLOS environment.The solution provided a simplified method,which utilized a recursion relation and did not need to incorporate the slope diffraction in the transition zone.The channel impulse response of the renowned Bertoni models was derived and the received signals could be predicted through a simple operation of convolution.The numerical results show that the proposed solution based on UTD-PO can find application in the analysis of multiple diffraction and significantly reduces the computational time.In addition,the attenuation of the received signal caused by the wedge-shaped obstacle is greater than that caused by the cylindrical obstacle.

关 键 词：超宽带 一致性绕射理论 物理光学 多重绕射 

分 类 号：TN925[电子电信—通信与信息系统]