混响室内多普勒频谱模型研究

摘要

多普勒频谱是信道时变特性的频域表现形式.为了研究混响室的信道时变特性,通过对混响室内散射机理和散射体分布的分析,建立了混响室内多普勒频谱的近似模型,并设计实验对模型进行验证.实验结果表明该模型能够拟合混响室内的多普勒频谱,通过选择合适的搅拌速度和载频,能够在混响室内合成具有一定多普勒展宽的电磁环境,对描述和控制混响室内信道时变特性具有重要的指导意义.%Doppler spectrum is the frequency-domain performance of the time-varying characteristics of the channel.In order to study the time-varying characteristics of the channel in the reverberation chamber,an approximate model of Doppler spectrum in the reverberation chamber is built by analyzing the scattering mechanism and the distribution of scatters,and experiments are designed to validate the model.The experimental results show that the model can describe the Doppler spectrum in the reverberation chamber,and the electromagnetic environment with certain Doppler spread can be synthesized in the reverberation chamber by selecting the appropriate stirring velocity and carrier frequency,which is of great significance for describing and controlling the time-varying characteristics of the channel in the reverberation chamber.