Design of High - Speed Simulation Models for MobileFading

This paper describes a procedure for the design of fast simulation models for Rayleigh fading channels. The presented method is based on an eecient implementation of Rice's sum of sinusoids by using table look-up techniques. The proposed channel simulator is composed of a few number of adders, storage elements, and simple modulo operators, whereas time-consuming operations like multiplications and trigonometric operations are not required. Such a multiplier-free simulation model is introduced as high-speed channel simulator. It is shown that the high-speed channel simulator can be interpreted as a nite state machine which generates deterministic output envelope sequences with approximately Rayleigh distribution. The statistical properties of the designed high-speed channel simula-tor are investigated analytically and compared with the statistics of the underlying Rayleigh reference model. Results of experiments for measuring the speed of the presented and other types of channel simulators are also presented.