Modeling And Simulation Of Mobile Fading Channels

In mobile communications,a good understanding and accurate modeling of propagation channels are great important for both effective system design and related performance analysis.Over the years of wireless communications,and depending on system operating environments,a great number of channel models have been proposed to describe the statistics of the amplitude and phase of fading signals.In this paper,a generalized Rice and an extended Suzuki mobile fading channel model is presented.It's adapted to not only land-to-land mobile radio channels,but also land-to-satellite mobile radio channels—a generalized mobile radio channel model. This thesis focuses on derivating the first and second order statistical functions,the method of computer for modeling of fading channels,the performance for modeling the practical fading environment of the proposed channel model,and the bit error rate performance of the modulated digital signals over generalized Rice channel model,etc.,the main contents of the thesis are organized as:1.A generalized Rice and an extended Suzuki analytical model is proposed,in which the influence of both multipath and shadowing is considered to adapt to various channel enviroment.The expressions for first and second order statistical functions are derived,including the probability density function of the amplitude and phase,the level crossing rate,as well as the average duration of fades.The influence of all the parameters in the analytical model on the three statistical functions is investigated.2.The proposed generalized Rice and extended Suzuki process is obtained by letting two coloured Gaussian noise processes passing a series of operation and filters.In order to acquiring the corresponding computer model,the method of approximating the coloured Gaussian noise processes by a finite sum of weighted and uniformly distributed phase sinusoids is adopted,the five computation methods of the frequency and magnitude are presented,and the performance of these computation methods is also compared.By useing PC computer,this thesis optimize all the parameters of the analytical model by fitting the three main statistics to the real-world measurement results,the comparison graphs between the statistics of the computer model,the mathematical model and measurement results are given,the performance of the generalized Rice and Suzuki model is discussed.3.The BER performance of digital signals through the generalized Rice model is studied.The average BER of coherent BPSK,coherent BFSK,differential BPSK, and noncoherent BFSK detections for the frequency-nonselective slowly fading channel is derived,and the influence of all the parameters in the generalized Rice model to the average BER is investigated.The performance of digital signals for the frequency-selective slowly fading channel is also studied.The average BER of coherent BPSK,coherent BFSK,differential BPSK,and noncoherent BFSK detections for L diversity combining techniques is derived,and the performance of diversity techniques for anti-fading is analysed.4.Designing a circuit board of an extended Suzuki model simulator.