基于TD-UTD的超宽带信号多径传播特性研究

Research on UWB Signal Multipath Propagation Characteristics Based on TD-UTD

超宽带信号传播特性是超宽带信道理论的重要组成部分,对其多径传播特性的研究具有重要的理论和实际意义。基于时域一致性绕射方法研究了室内复杂环境中超宽带信号的多径传播特性,仿真结果与已知文献的测量结果一致性良好,验证了时域一致性绕射方法在室内复杂环境预测电波传播特性的正确性和有效性。比较分析了仿真中得到的视距传播和非视距传播的路径损耗、电场强度、接收功率分布等传播参数。仿真结果表明:在视距传播环境下,直射路径最先到达,且信号最强,在全部多径信号中占绝大部分能量;在非视距传播环境下,透射损耗较大,但绕射对信号接收功率影响较大,不能忽略。仿真结果可以为室内复杂环境下超宽带无线通信网络覆盖与优化提供理论依据。

The propagation characteristics of Ultra-Wide Band（ UWB） is the important part of UWB channel theory. The study of multipath propagation characteristics has considerable theoretical and practical interest.The multipath propagation characteristics of UWB signal in the complex indoor environment are studied based on the Time Domain Uniform Theory of Diffraction（ TD-UTD）.A comparison with measurements taken from the literature has been presented.The agreement between the measured results and simulated results proves the accuracy and validity of the method for the prediction of the propagation characteristics of the electromagnetic wave.Some propagation parameters are analyzed such as the path loss,electric field intensity,the distribution of received power and so on in terms of Line-Of-Sight（ LOS） and Non-Line-Of-Sight（ NLOS） environment.The simulated results indicate that the direction path is the first to arrive the receiving point and it is the strongest signal in LOS scenarios.Transmission loss is very high,however,diffraction is found to be a significant propagation mechanism in NLOS environment and cannot be ignored.These results provide the theoretical basis for wireless communication network coverage and optimization of UWB signal in indoor complex environment.