Mobile Communication Channel Modeling And Simulation

In the process of communication system design, the performance of the communication system is analyzed through the simulation. The modeling of mobile radio channels is an indispensable part of communication system simulation. Therefore, the modeling of different radio propagation environments has become the research hotspot. This dissertation deeply investigates on the modeling of three types of mobile radio channels: the modeling of frequency hopping Rayleigh fading channels, the modeling of frequency non-selective Rayleigh fading channels under non-isotropic scattering environments and the modeling of frequency non-selective mobile-to-mobile Rayleigh fading channels. The research includes the following topics:Firstly, the dissertation gives a brief introduction of the research significance. Secondly, the current states of three types of channel models are introduced. Moreover, the problems of these channel models are pointed out. At last, the dissertation gives some basic concepts of mobile communication channel. And some approaches to the modeling of mobile radio channels are introduced, especially the modeling approach based on sum-of-sinusoids analyzed in detail.For frequency hopping Rayleigh fading channels, a new simulation model based on sum of sinusoids is proposed. It is shown that a frequency hop in the physical channel model corresponds to phase hops in the simulation model, while maintaining all other parameters unchanged. Moreover, the simulation model takes the frequency correlation into account. Through the simulation model, we can know the correlation between hops. Due to the fact that closed-form expressions are given for all simulation parameters, so the correlation properties of the proposed simulation model can be studied. Through theoretical analysis, the dissertation gives the expressions of the correlation properties. Numerical simulation shows that a pretty good agreement between the correlation properties of the simulation model and those of the underlying reference model has been observed in low computation complexity.In many radio propagation environments, the distribution of the scatterers of the channel is nonuniform. The channel modeling of non-isotropic scattering environments is a research topic. Therefore, two simulation models of Rayleigh channels based on sum of sinusoids are proposed for frequency non-selective mobile fading channels under non-isotropic scattering environments. In both simulation models, the von Mises distribution was used to characterize angle-of-arrival. Through theoretical analysis, the dissertation gives the correlation properties of the two simulation models. Compared with the existing model, the correlation properties of the two simulation models show better agreement with those of the reference model.With the development of mobile ad hoc networks and dedicated short-range communication systems for intelligent highways, mobile-to-mobile Rayleigh fading channels are widely used. Therefore, we propose three new simulation models based on sum of sinusoids. All of the three simulation models use the"double ring"concept. Through theoretical analysis, the dissertation gives the correlation properties of the three simulation models. Numerical simulation shows that a good agreement between the correlation properties of the simulation models and those of the underlying reference model has been observed.