The Realization Of Fading Channels For Wireless Communication

Mobile communication as one of the main roles in the future personal communication is widely applied. In mobile communication, for the movement of the mobile terminal, the received signals are affected by the multi-path fading and shadow effect. Thereby the communication channel between the base station and the mobile terminal constrains the performance of the whole system. Researching the propagation and variability of the electromagnetic wave and constructing the channel model can simplify the calculation of fading parameters, supply the reliable reference for system design, and select the optimal modulation, error coding and multiple accesses.The research abort channel model is always remarkable. A new statistical model for non-frequency mobile radio channel is presented in this paper from the Doppler-Power -Spectral-Density. The study contains three aspects as follows:Firstly, the paper demonstrates the development of mobile radio communication and the key technology of 3rd generation mobile communication.Secondly, the paper presents small-scale propagation model base on the propagation characteristic of electromagnetic wave, describes different ways to model and predict the fading effects of radio propagation, and analyzes the statistic properties of channel model.Thirdly, the paper presents some basic simulation models of the radio channel, and simulates the channel models. Sum-of-sinusoids statistical simulation models are proposed for Rayleigh fading channels. These models employ random initial phase, and conditional random Doppler frequency for all individual sinusoids. It is shown that the autocorrelations and cross correlations of the quadrature components, match the desired ones exactly, even if the number of sinusoids is very small. Moreover, the probability density functions of the envelope, approach the correct ones as the number of sinusoids approaches infinity.