Satellite Communication Channel Model Studies On Q/V Band

Communication technology is the basis of information globalization,and the establishment of a channel model that meets the actual environment is a necessary work for wireless communication research.Faced with the rapid growth of information data and services and the shortage of spectrum resources,it has become an inevitable trend to carry out research on communication technologies in higher frequency bands.Thus,millimeter wave with frequency range of 30 GHz～300 GHz becomes one of the key points in the research of next generation mobile communication technology.Millimeter wave communication systems have extremely high bandwidth and transmission rate,and because the wavelength of this band is in the millimeter range,it is favorable for application in small devices.The Q-band（30～50 GHz）and V-band（50～75 GHz）,which are studied in this project,belong to the millimeter wave band.In addition,building an integrated air-space-space communication network is a prerequisite for seamless global communication,so the research and development of satellite communication system is also in progress.In this thesis,we discuss and study the problem of modeling satellite communication channels in Q/V band.First,according to the layered spatial characteristics of satellite communication systems,the effects on radio waves within each spatial layer are studied in the order of downlink,where the atmospheric propagation characteristics are mainly referred to the YD/T-984 standard to give the calculation method of signal fading.On this basis,the signal propagation characteristics in the link are analyzed in conjunction with the characteristics of electromagnetic waves in the Q/V band,and the reasons for the applicability of the Q/V band to satellite systems are also illustrated in this way.The modeling methods of wireless channels and various existing channel models are studied,and the existing mathematical models of channels and the Tap Delay Line（TDL）model are introduced to discuss the shortcomings of the existing models and the researchability of high-band broad Band satellite channels.The treatment of multipath effects in this scenario is proposed,and the Gamma multipath delay distribution model is established.The channel model in this thesis is built on the measured data,and the focus of the large scale fading part is on rainfall fading,and a Markov chain-based short-term rainfall fading model is established based on the statistical properties of rainfall probability.The small-scale fading refers to the channel model parameters in the 3GPP standard,with multipath effects as the focus.Firstly,channel measurement is performed,then the signal is clustered according to time and space using clustering algorithm,then the statistical characteristics of multipath signal are extracted to establish the Rayleigh-Gamma multipath time delay power spectrum model,and finally the Random Coefficient Regression（RCR）model and the least error algorithm based onNorm Method are used to find the TDL model parameters.