In this paper, the analysis of Shannon capacity for selection combining (SC) and maximal ratio combining (MRC) diversity systems in the generalized α − κ − µ fading channel is presented. Closed-form expressions for probability density function (PDF) at the output of SC and MRC diversity systems are given. Also, closed-form expressions for Shannon capacity for cases of SC diversity with independent and identically distributed branches, MRC diversity with independent and identically distributed branches and for case of no diversity are derived. The obtained results are numerically calculated and graphically presented for different combinations of fading parameters α, κ and µ.
Abstract:The paper describes the main characteristics and the principle of distribution of signals Direct-to-Home service. The most important characteristics of DTH providers in Europe: satellite, satellite positions, the number of multiplexes, the DVB standard, compression, standard and coding system are presented. Also, the change in the number of SDTV and HDTV DTH providers for five years since 2000 is given. The characteristics that provide DTH services in former Yugoslavia are presented, as well as the structure of the TV channels that are distributed as part of the DTH services in the states of former Yugoslavia.
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.
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