The Generic Framework Of Standard Radio Channel Models Simulation And Calibration

In wireless communications,radio propagation refers to the behavior of radio waves when they are propagated from transmitter to receiver.In the course of propagation,the interaction of reflection,diffraction and scattering would make radio waves undergoing complex and unpredictable fading phenomenon,and radio channel modeling is a mathematical description of such fading phenomenon.Radio channel simulation is a tool to simulate the real radio channel by using computer program or hardware emulator.It plays a key role in field of evaluating new concepts and technologies,communication network planning and optimization,system conformance testing and MIMO over-the-air(OTA)testing etc.This thesis mainly focuses on how to develop the generic radio channel models simulation framework,and the major work and contributions of this thesis include,1.Designing and development of the generic radio channel models simulation framework.Most of existing radio channel simulation tools are based on three different types of radio channel models,i.e.the tapped delay line(TDL)models,the MIMO spatial correlation channel models and the geometry-based stochastic channel models(GBSM).This thesis designs the corresponding generic simulation framework of each of them.To simulating TDL channel models,this thesis takes the tap as the basic simulation unit,and the parameters that describe a tap include the power delay profile and the Doppler power spectrum density function.Based on that,this thesis further developes a simulation tool which is fully compatible with most existing standard TDL channel models and also supports user-defined TDL channel models.For MIMO spatial correlation channel models,this thesis designs a generic simulation framework for modeling spatial correlations of MIMO raido channel.And combining with the simulation framework of TDL models in a certain and reasonable way,it presents the generic simulation framework of these models.By separating the simulation of subchannel fading characteristics and spatial correlation of MIMO radio channel,it makes the development and extension of such a simulation tool which based on this framework much easier.Moreover,a simulation tool developed from this framework is supposed to be compatible with most existing MIMO spatial correlation channel models,and also supports the simulation of user-defined channel models.For GBSM,based on the standard simulation procedure,this thesis presents a generic and compatible framework for two-dimensional(2D)and three-dimensional(3D)GBSMs for both link level and system level simulations.It enables a simple,flexible and scalable method for developing and simulating different GBSMs.It mainly consists of three related parts,i.e.the antenna configuration,the network layout and the channel parameters generation.Simulation tools developed from this framework is fully compatible with most of existing GBSM simulation tools.2.To explore calibration and validation solutions of radio channel model simulation tools.The major research work of this section inclue calibration solutions of radio channel models simulation tools and validation solutions of the implementation of radio channel emulators.On the one hand,for calibration of radio channel models simulation tools,this thesis introduces the 3GPP proposed 3D simulation tools phased calibration procedure,and makes a comprehensive calibration of implemented 3D channel simulation tools.The main calibration parameters used in this procedure cover the large scale fading parameters and small scale fading parameters.The calibration results show that the radio channel simulation tools developped from the generic simulation framework which is proposed in this thesis is fully available and effective.In addition,this thesis also makes a comparative analysis of the outage capacities of 2D and 3D standard GBSM channel models with simulation results from the calibrated radio channel simulation tools.And the results show that the use of 3D MIMO technologies can obviously increases the capacities of communication systems.On the other hand,considering with the current laboratory resources and literal references,this thesis introduces some relatively viable tesing and validation solutions which involve the Vector Network Analyzer and the Spectrum Analyzer to validating the implementations of radio channel emulators.And all these solutions can enable the verification of radio channel power delay profile,Doppler power spectrum density and other parameters.While the generic channel simulation framework proposed in this thesis can provides a conformance solution for development of existing radio channel simulation tools,it also has certain reference value for the development of future radio channel modeling and simulation.Besides,the solutions presented in this thesis for the calibration of radio channel simulation tools and the validation of radio channel emulators also provide the corresponding engineering reference for research work in the field of radio channel simulation.