Performanse i informacioni kapacitet mobilnih telekomunikacionih sistema sa tehnikom diverzita u različitim propagacionim okruženjima

In this doctoral dissertation, the diversity techniques are considered in order to reduce the influence of fading on the system performances in different propagation environments. The second chapter considers the selective combining (SC) and the maximal ratio combining (MRC) with two and three inputs. SC and MRC receivers with two inputs are considered when Nakagami-m fading is at the first input while α-μ fading is at the second input. Then, an SC receiver with three inputs is considered when Nakagamim, Rice and Rayleigh fading are presented. As a special case, SC and MRC receivers with three inputs with Rice, Nakagami-m and α-μ fading are considered. The SC performance of the two-input receivers is considered in the case of the Nakagami-m fading and Nakagami-m interference at one input, while at the second input are the Rice fading and Rice interference, as well as the case when a desired Rice signal and Nakagami-m interference are presented. For these models the probability density function (PDF), cumulative density function (CDF), moments, level crossing rate (LCR) and the information capacity of the channel at the output from the SC and MRC receivers are calculated, the numerical results are graphically presented and confirmed by simulations. In the third chapter, the significant contribution of the doctoral dissertation is the formation of the broken Nakagami-m distribution and the analysis of the broken Nakagami-m fading. An SC receiver with two and three inputs with broken Nakagami-m fading is examined. The dissertation also examines the case of the SC two-way receivers where there is a broken Rice/Nakagami-m fading. For such cases, expressions for PDF, CDF and LCR are derived. In the fourth chapter, the macrodiversity system is analyzed. The macrodiversity SC receiver with two micro-diversity SC receivers, when α-μ fading is present at the inputs and the correlated Gamma shadowing, as well as the case when Rayleigh, Nakagami-m fading and the correlated Gamma shadowing are at the inputs are examined. The case of macrodiversity SC receivers with three microdiversity SC receivers is further considered when Rice, Nakagami-m, κ-μ fading and correlated Gamma shadowing are presented at inputs. For these models, the PDF, CDF, LCR and the information capacity of the channels at the macro-diversity SC receiver output are calculated and numerical results are graphically presented