多径效应对无线通信系统性能的影响

Influence of multipath effect on performance of wireless communication system

无线通信过程中由于信道中障碍物的影响,使得信号从发射端到达接收端时存在多条路径,在接收端引起多径效应。信道模拟器在基带处理多径信号,然后变换到射频段,这与实际情况有所出入。软件仿真模块呈现为一个黑盒子,屏蔽了多径效应的本质。针对这一问题,采用虚拟仿真技术开发多径模型,将抽象的理论知识呈现为直观的现象。利用多径效应模型分析多径效应对无线通信系统的性能影响,给实验者提供身临其境的感受,并且界面友好、实验操作简单,帮助实验者掌握无线通信中的多径效应问题。多径效应对无线通信系统的性能影响实验采用浏览器/服务器模式,可以远程操作实验平台,同时多人进行操作,相互之间不存在操作干扰,便于开展实验,实现个性化学习。

In wireless communication,there are many paths from transmitter to receiver because of the influence of the obstacle in the wireless channel,and the multipath effect emerges at the receiver. The channel simulator is used to process the multiple signals at baseband and then convert to radio frequency band,which is not coincident with the reality. The software simulation module which appears as a black box shields the essence of the multipath effect. The technology of virtual simulation is adopted to develop the multipath model,so as to make the abstract theory be presented as intuitive phenomenon. The multipath effect model is used to analyze the influence of multipath effect on the performance of wireless communication system,which not only can provide immersive experience for the experimenters,but also has friendly interface. The experiment can be done easily and help the experimenter understand the multipath effect. The browser/server mode was used in the experiments of the influence of multipath effect on performance of wireless communication system. The experimental platform can be operated by more people remotely and simultaneously,and there is no any interactional disturbance. The experiment can be done easily and can realize the individualized learning.