3D Geometrical-based Channel Models And Its Vehicle Communication Application Analysis

With the rapid popularization of intelligent mobile terminals, the number of wireless communication users is also increasing, which makes the demand for data transmission rate increase exponentially. With the development of broadband system,the improvement of data rate and the requirement of various services, channel modeling has become a hot spot. This paper mainly focuses on the three-dimensional(3D) geometrical-based channel models and its vehicle communication application,through the 3D macrocellular channel modeling, we deeply analyze the multiple input multiple output (MIMO) antenna array, Doppler shift (DS), the power spectral density (PSD), spatial fading correlation (SFC), channel capacity, which make a theoretical basis for the performance analysis of the wireless mobile communication system. In this thesis, the research work mainly is divided into the following four aspects:Firstly, aiming at the problem of multipath fading in outdoor macrocell mobile communication environment, the vertical component is introduced to establish the statistical channel model of the three-dimensional spatial domain in order to improve the accuracy of the description of the channel change. Analytical algorithms for the angle of arrival (AOA) and the time of arrival (TOA) probability density functions in the azimuth and the elevation plane are derived. The space-time probability density functions of the electromagnetic signal in the mobile station (MS) and the base station (BS) are given. We deeply analyze the impact factors of space-time characteristics in order to provide theoretical support for multipath signal parameter estimation in vertical dimension.Secondly,based on the above model, the scatterer near MS is reduced to a two-dimensional plane, and a three-dimensional statistical channel model based on scattering cluster is constructed. The probability density functions of forward and reverse links in multipath fading channels are derived numerically, including the angle of arrival and time of arrival. The Doppler shift of the forward and reverse link channel caused by the frequency variation is analyzed. Numerical simulation results show that the channel parameter estimation of this model is in line with the theory and the actual communication environment. The characteristics of multipath fading channels are described more comprehensively.Then, based on the above 3D scattering cluster channel model, on the basis of setting MIMO multi antenna uniform linear array (ULA) and uniform circular array(UCA), fading channel space-time distribution characteristics are derived, the influence of different signal azimuth angles distribution on the performance of MIMO in the scattering channel are analyzed in detail, including MIMO spatial fading correlation, channel capacity and antenna array configuration.Finally, in this thesis, a geometric street scattering channel model for C2C communication systems is presented under line-of-sight (LOS) and non-LOS (NLOS)propagation conditions, starting from the geometric model, a stochastic reference channel model is developed, assuming that the mobile transmitter (MT) and the mobile receiver (MR) are moving, while the surrounding scatterers are fixed.Analytical expressions for the probability density functions (PDFs) of the angle-of-departure (AOD) and the angle-of-arrival are derived. By obtaining the PDF of the total Doppler frequency, the Doppler power spectral density and the autocorrelation functions (ACF) of the proposed model also are investigated and computed. To validate the reference channel model, its Doppler parameters are compared to those of a real-world measured channel for urban and rural areas. The results show that the statistical characteristics of the simulated channel model are consistent with the reference channel model. In the proposed geometrical-based channel model, we not only study the channel model in the street C2C communication environment creatively, but also expand the research and application of outdoor C2C vehicle communication.