Research On The Performance Of Millimeter-wave Communication System In High-speed Mobile Environment

Millimeter-wave wireless communication technology has attracted wide attention in high-speed mobile communication because of its rich frequency band resources and support for higher transmission rates.However,millimeter-wave signal with short wavelengths will be subjected to more severe Doppler effects in high-speed mobile environments,leading to many challenges in system design.This paper mainly studies the impact of Doppler effect on millimeter-wave SC-FDE communication systems caused by high mobility,through simulation and comparing different anti-Doppler methods.An anti-Doppler method that can be used in practical high-speed mobile environments is designed.Finally,based on the models and parameters in IEEE802.11 ad,a millimeter-wave system with efficient digital baseband that can be applied to high-speed mobile environments is realized,and performed performance testing in an actual high-speed mobile environment.This thesis is organized as follows:Firstly,this thesis studies the characteristics of high-speed mobile millimeter-wave channels,especially the small-scale fading characteristics in high-speed time-varying environments using directional antennas.Then several time-varying channel modeling methods are applied to analyze different anti-Doppler techniques.Secondly,the thesis makes deep research on the performance of the millimeter-wave SC-FDE system under fast time-varying channels and research the influence of the doppler effect on the performance of the SC-FDE system.It can be observed that the time-varying channel is equivalent to the channel with additional noise on the demodulated data.In order to solve this problem,this thesis research four classical anti-Doppler methods,including equivalent frequency offset compensation,IB-DFE equalization,equivalent noise estimation and sub-blocking techniques.In addition,this thesis proposes an improved traditional pseudo-CP sub-blocking method and conducts performance simulation.Finally,the algorithm selection strategy of implementable millimeter wave high-speed mobile communication system is presented,The related algorithms address problems such as frame design,frame synchronization and frequency offset compensation.Based on those algorithms,the receiver baseband architecture of millimeter-wave communication system is also designed,including framesynchronization module and frequency domain equalization module.In addition,the performance of the designed millimeter wave communication system is studied through simulation tools,including the study of the effectiveness and reliability of the millimeter wave communication system in realistic high-speed mobile environments.