A method of capacity increasing of sensor telecommunication networks has been proposed and investigated. The method proposed is based on a placement control of unmanned aerial vehicles in view of the rapid and unpredictable movement of mobile subscribers. A distinctive feature of developed method is combining mathematical models of connectivity estimation taking into account a quality of service of mobile subscribers and an advanced search algorithm of quasi-optimal placement of unmanned aerial vehicles in a single computational procedure. An application of the method proposed allows increasing the throughput of telecommunication networks to 15 — 20 percent in comparison with existing methods. Deviations of obtained sub-optimal solutions from optimal ones received by exhaustive method do not exceed 5 — 7 percent.

High-performance modern Internet allows internal delivery and complement of attractive (mobile) services in the same way and QoS that are in the LANs. The world economics is widely characterized nowadays via the stable trends that the large and mid-range companies and authorities let in ever greater extent to outsource own engineering services via external smaller service providers. A concept for a modern virtual telecommunication engineering office under use of Service-Oriented Architectures and Cloud Computing technologies has been offered. Multiple use cases for virtual telecommunication engineering office have been discussed. As a significant example, the CANDY Framework and Online Platform have been examined. The important development trends for the CAD for network planning regarding to the tool integration and effective access optimization have been discussed. The CANDY system has been represented as an exhibit at CeBIT 2007, 2008, 2011 in Hannover.

A multiroute cross-layer transport protocol with data delivery capabilities for mobile networks is proposed. Protocol combines routing functionality with reliable data delivery. It is shown that finding multiple routes to the destination can be successfully combined with a connection establishment for connection-oriented protocols such as TCP. Establishing a connection over multiple routes can significantly decrease the time of the connection recovery when some routes become unavailable thus increasing total throughput of transport protocol in mobile networks environment. Performance analysis of the proposed protocol indicated that in mobile sensor networks with 5 - 10 % of packet losses its throughput is approximately 60 % higher than throughput of TCP-Reno2 flowing over shortest path.

Computer aided microstrip structures modeling has been performed by conformal mapping technique. A new approach to reduce the connectivity order of the original cross-section geometry of the structure is proposed. The multiply connected domain is reduced to simply connected ones by implementation of magnetic slits concept. The microstrip structures analysis is carried out by numerical conformal transformations technique realized in Schwarz - Christoffel toolbox for MATLAB. This technique is applied to the quasi-static analysis of coupled microstrip lines taking into account the conductor thickness. Described approach ensures high numerical efficiency and can be used for accurate analysis of complex microstrip structures.

Індекс рубрикатора НБУВ: З95 + З264.8

Рубрики:

Радіолокація

Регулятори напруги, струму і потужності

Шифр НБУВ: Ж100651 Пошук видання у каталогах НБУВ 

Індекс рубрикатора НБУВ: З845.8

Рубрики:

Смужкові лінії передачі. Лінії передачі з поверхневою хвилею

Шифр НБУВ: Ж100651 Пошук видання у каталогах НБУВ 

Electromagnetic wave generation processes in the hybrid log-periodic microstripe antenna on the dielectric substrate integrated with field-effect transistor are experimentally studied in the frequency range of 6 — 20 GHz. The possibility of synchronization and power combining in the array consisting of antenna-coupled oscillators placed on the common dielectric substrate is investigated. It is shown that the considerable increasing the generation efficiency and power combining can be obtained by using the external synchronization signal or quasi-optical design of the array.

Single-element antenna that uses microstrip line as a feeder and cylindrical dielectric resonator orthogonally oriented relative to the line as a radiating element has been investigated. The complete mathematical model of proposed design consisting of a number of analytical expressions for main antenna characteristics is obtained and verified. The analytical relation for antenna return loss versus stub length and coupling coefficients of dielectric resonator with the feeding line and open space is derived. The assessment of the potential possibility and conditions of perfect antenna matching with feeding line is carried out. The influence of main parameters of a dielectric resonator antenna on its characteristics is examined. The numerical analysis of different antenna parameters proving the obtained analytical expressions is performed. The results of theoretical analysis are in good agreement with experimental data.