摘要
混响室内的电磁波经搅拌器和室壁多次反射,形成了多径衰落,利用混响室模拟了实际无线通信中2种常见的多径衰落环境。对混响室内的发射天线、接收天线以及损耗物进行配置,设置了6组实验。其中一组是经典混响室(发射天线不可直接辐射接收天线)的实验,实验结果表明,当工作频率、搅拌器转速控制得当时,混响室能够模拟各向同性的瑞利衰落场环境。另外5组是发射天线直接辐射接收天线的实验。实验结果表明,当发射天线和接收天线存在直接耦合分量时,混响室能够模拟莱斯衰落场环境,并且通过控制天线正对距离、工作频率以及损耗物加载量可改变直射波和反射波强度的占比,使混响室内的电场获得不同的莱斯K因子。其中损耗物加载量对莱斯K因子的影响最大,不仅会降低混响室的品质因数,还使混响室内电磁场的边界条件更为复杂,从而使混响室内的环境更接近于真实的无线通信环境。
The multipath fading characteristics of electromagnetic wave are formed after multiple reflections through agitator and chamber wall.Based on these characteristics,two common multipath fading environments in real wireless communication are simulated by using reverberation chamber.Six sets of experiments are set up to reconfigure the transmitting antenna,receiving antenna and loss material of reverberation chamber.One of the experiments is the classical reverberation chamber(the transmitting antenna can’t directly radiate the receiving antenna).The experimental results show that the reverberation chamber can simulate the isotropic Rayleigh fading field environment when the operating frequency and agitator speed are controlled.The other five groups are experiments in which the transmitting antenna directly radiates the receiving antenna.The experimental results show that when the transmitting antenna and the receiving antenna have direct coupling components,the reverberation chamber can simulate the Rician fading field environment.The ratio of direct wave and reflection wave intensity can be changed by controlling the antenna distance,operating frequency and the loading of loss material,so that the electric field in the reverberation chamber can obtain different K factor.The K factor is the most affected by the amount of loss material,which can not only reduce the quality factor of reverberation chamber,but also make the boundary conditions of electromagnetic field in reverberation chamber more complicated.So that the reverberation chamber environment is closer to the real wireless communication environment.
作者
李欢
刘晓东
赵翔
闫丽萍
LI Huan;LIU Xiaodong;ZHAO Xiang;YAN Liping(College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China;Equipment Department of PLA Air Force, Beijing 100843, China)
出处
《无线电工程》
2019年第8期715-719,共5页
Radio Engineering
基金
国家自然科学基金面上项目(61877041)
关键词
混响室
多径衰落
电磁环境
瑞利分布
莱斯分布
reverberation chamber
multipath fading
electromagnetic environment
Rayleigh distribution
Rician distribution
