System Performances in the Presence of One Fast Weibull and One Slow Gamma fading

Abstract

Abstract:This paper decribes the model of forming equivalent envelope of a signal at the entrance of the wireless digital telecommunication system in the presence of one fast Weibull and one slow Gamma fading. Probability density function (PDF) of random variable at the reception side has been determined for the described model. Dependence of the probability density function (PDF) of the parameters of fading (fading severity) and corresponding components power is analytically and graphically described. The influence of fading parameters on statistical characteristics of the received signal and quality of the signal detection in the entire communication system has been graphically presented. Apstrakt:Ovaj rad prikazuje model formiranja ekvivalentnog omotača signala na ulazu u prijemnik bezičnog digitalnog telekomunikacionog sistema, kada je istovremeno prisutan parametar Vejbulove raspodele i spor gama feding. Za dati model utvrđuje se funkcija gustine verovatnoće (PDF) slučajne promenljive na strani prijemnika. Zavisnost funkcije gustine verovatnoće feding parametara i snage odgovarajućih komponenata prikazana je analitički i grafički. U radu je dat grafički prikaz uticaja parametara fedinga na statističke karakteristike primljenog signala i kvalitet detekcije signala u celokupnom sistemu komunikacije.