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1

Influence of zero and non-zero boresight pointing errors on bit-error rate free-space optic transmission over Málaga atmospheric channel

Smilić M., Perić Z., Milić D., Marković A., Savić M.

Optica Applicata

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2018

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Vol. 48, nr 2

179--189

EN

In this paper, the influence of a zero and a non-zero boresight pointing errors on the performances of free-space optic transmission over the Málaga atmospheric turbulence channel is considered. Closed form expressions for a zero boresight channel model probability density function, non-zero boresight channel model probability density function, as well as a bit-error rate over a binary phase shift keying modulation transmission are provided. Numerical results for zero and non-zero boresight pointing errors are graphically presented.

2

Optimization of μ-law companding Quantizer for Laplacian source using Muller’s method

Nikolić J., Perić Z., Aleksić D.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 3a

206--208

EN

The motivation of this paper is based on the fact that a straightforward solution to optimization of the widely used μ-law companding quantizer has not been proposed so far. We deal with this problem for the case of a Laplacian source and we apply Muller’s method for the optimization of the quantizer in question. Particularly, we use minimal distortion criteria and we apply Muller’s method in order to determine the key parameter of the μ-law companding quantizer. The optimization method we propose is very general and it is easily modified for non-Laplacian sources. It can be applied for speech compession, because speech signals are well modeled by Laplacian sources.

PL

W artykule opisano sposób optymalizacji kwantyzatora kompansji u-law. Do tego celu zastosowano metodę Muller’a oraz kryterium minimalnych zakłóceń. Proponowana optymalizacja jest ogólna i może być zmodyfikowana dla źródeł nielaplasjanowych.

3

Support Region Determination of the Quasilogarithmic Quantizer for LAPLACIAN source

Aleksić D., Perić Z., Nikolić J.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 7a

130-132

EN

This paper proposes the method for the support region determination of the quasilogarithmic quantizer designed for the Laplacian source and an arbitrary variance. The method is based on the minimal distortion criteria and it implies some approximations yielding the asymptotic formula for the optimal support region threshold of the quasilogarithmic quantizer. This formula shows which parameters influence the support region threshold of the quasilogarithmic quantizer which is of great importance for practical implementation of the considered quantizer in the high-quality quantization of signals, which, as well as speech signals, have statistics modeled by the Laplacian probability density function.

PL

W artykule zaproponowano metodę określania region pomocniczego (support region) w quasi logarytmicznym kwantyzerze zaprojektowanym do źródeł typu Laplasian o dowolnej wariancji. Kwantyzer może być zastosowany między innymi do kodowania mowy w systemach komunikacyjnych.