We present novel general, simple, exact, and closed-form expressions for the probability density function (PDF) and cumulative distribution function (CDF) of the ratio of the products of two independentα-μvariates, where all variates have identical values of alpha parameter. Obtained results are applied in analysis of multihop wireless communication systems in different fading transmission environments. The proposed theoretical analysis is also complemented by various graphically presented numerical results.
A system with macrodiversity selection combining (SC) receiver and for microdiversity equal gain combining (EGC) receivers is considered. Received signal is subjected, simultaneously to multipath fading and shadowing, resulting in signal envelope and signal power variation. Closed form expressions for moments of macrodiversity SC receiver output signal envelope are calculated. Numerical expressions are plotted to present the influences of Gamma shadowing severity and Nakagami-m severity on moments of proposed system output signal.
In the present article, Constructive Approach is introduced for students, to model a simulation and develop a real system for VoIP. The main aim is to provide experiences on modeling and development of the real system with the equipment in the controlled laboratory environment by using established good laboratory and manufacturing practice. Developing systems, assigned to students, helped them to integrate their theoretical knowledge with their practical skills. Since classical courses are limited to the related theoretical knowledge given by an instructor, students can gain valuable experiences with fully developed functional simulation and the real system, important correlations and procedures, which are implemented in the engineering practice, and thus are introduced in this paper. ß
In this paper the probability density function of the SSC combiner output signal at one time instant and the joint probability density function of the SSC combiner output signal at two time instants are determined. Switch and Stay Combining (SSC) is considered. The presence of the Nakagami-m fading at the input is observed. The results are shown graphically for different variance values and decision threshold values..
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