year 2014

20141112-04
Transmission quality assurance in the design of HFC television network
Lidia T. Jordanova, Dobri M. Dobrev

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The paper deals with signal degradation due to noise and nonlinear distortion in the forward channel of HFC television network. A mathematical model of the optical channel is presented that makes it possible for the following ...  read more

20141112-03
Optimal divergence of laser beam in optical wireless communication systems
Tsvetan A. Mitsev, Nikolay K. Kolev

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DОtОrmТnТng tСО optТmal dТvОrgОncО oП transmТttОr’s bОam Тn optТcal аТrОlОss communТcatТon systems (OWCS) can largely compensate for the negative impact of the change in the direction of propagation ...  read more

20141112-02
Computer simulation of distortions in optical fiber for CATV systems
Kalin L. Dimitrov, Lidia T. Jordanova, Tsvetan A. Mitsev

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A general overview of most problems appearing when signals are transmitted in the fiber optic part of a CATV system is made. Some basic theoretical dependencies, as well as numerical methods suitable for computer simulation, ...  read more

20141112-01
Synthesis of microstrip filters based on miniaturized hexagonal resonators
Marin V. Nedelchev, Ilia G. Iliev

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The paper proposes the application of the miniaturized hexagonal resonators in the microstrip filter design and their applicability in mobile communication systems. The main coupling topologies are researched and the coupling ...  read more