Computer simulation is now increasingly being used for design and performanceevaluation of communication systems. When simulating a mobile wireless channel forcommunication systems, it is usually assumed that the fading process is a randomvariate with Rayleigh distribution. The random variates of the fading process shouldalso have other properties, like autocorrelation, spectrum, etc. At present, thereare a number of methods to generate the Rayleigh fading process, some of themquite recently proposed. Due to the use of different Rayleigh fading generators,different simulations of the same communication system yield different results. Threemethods, viz., the Jakes method, the IDFT method and the filtering WGN method,have been studied, simulated and compared based on the Rayleigh fading process'properties. Various communication systems have been simulated using the Rayleighfading generators and the difference in the results, if any, have been analyzed. Theresearch studies the different Rayleigh fading generators and compares them usingthe properties of the Rayleigh fading channel. It is found that the IDFT method andthe filtering WGN method generate processes that have properties very close to theideal Rayleigh fading process.
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