Browsing Communications and Spectrum Management Research Center (ISYAM) by Issue Date
Now showing items 1-20 of 22
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Computer aided frequency planning for the radio and TV broadcasts
(Institute of Electrical and Electronics Engineers, 1996-06)The frequency planning of the VHF and UHF broadcasts in Turkey is described. This planning is done with the aid of computer databases and digital terrain map. The frequency offset is applied whenever applicable to increase ... -
Propagation prediction and planning tools for digital and analog terrestrial broadcasting and land mobile services
(2000)The problem of efficient utilization of the radiofrequency spectrum is becoming more complex due to the increasing demands on the spectrum, which is a limited natural resource. If this natural resource is to be used ... -
A GIS-Aided frequency planning tool for terrestrial broadcasting and land mobile services
(Springer, Dordrecht, 2002)Radio provides an important technology for emergency preparedness and emergency response. It not only offers rapid communication for emergency workers within the disaster area, but also affords the means of disseminating ... -
Outdoor propagation models: applications and considerations for real life problems
(IEEE, 2003)Implementation of propagation prediction models is discussed. It is shown that for real terrain and building data, the additional parameters and assumptions must be made. The determination of coverage percentages for digital ... -
Sabit genişbant kablosuz sistem tasarımı için planlama metodu ve yazılımı
(URSI, 2004)Genişbant Kablosuz Erişim (GKE) sistemleri, nüfus yoğunluğunun yüksek olduğu yerleşim yerlerinde özel ve tüzel ağ kullanıcılarına esnek ve çift yönlü veri dağıtımını sağlayan modern bir teknolojidir. Sabit GKE hakkında ... -
Design of an emergency PMR network based on CDMA 450 in İstanbul metropolitan region
(TEHOSS, 2006)In this work, a complete design of PMR (Professional Mobile Radio) network based on CDMA 450 in ˙Istanbul metropolitan region is presented. Coverage and capacity analysis are performed by the developed simulation software ... -
Piecewise constant line fitting on noisy ramped signals by particle swarm optimization
(IEEE, 2012)In this study, Particle Swarm Optimization(PSO) is proposed for change point (edge) detection on noisy ramped signals. By taking moving averages between detected edges, noise on ramped signals is filtered and desired ... -
Mikrodalga karasal radyo link analiz ve simülasyonlarının Rec. ITU-R P.530 tavsiyesine uygun olarak gerçeklenmesi
(URSI, 2014)Bu çalışmada, NATO Band 3+ (1350 – 2690 MHz) ve NATO Band 4 (4400 – 5000 MHz) frekanslarında çalışan karasal mikrodalga radyo linklerin analizi için gerekli olan yansıma noktası hesabının iyileştirilmesi ve yansımadan ... -
Validity and limitations of the median-line integral equation technique in the scattering by material strips of sub-wavellength thickness
(Institute of Electrical and Electronics Engineers, 2014-07)Considered is the 2-D scattering of a plane wave by a thin flat material strip. The data obtained by using the empirical method of generalized boundary conditions and singular integral equations on the strip median line ... -
The effect of terrain roughness in the microwave line-of-sight multipath fading estimation based on Rec. ITU-R P.530-15
(IEEE, 2014-08)Multipath fading is an important constraint on the prediction of path loss for terrestrial line-of-sight microwave links. The International Telecommunication Union - Radiocommunication (ITU-R) Rec. P.530 [1] is one of the ... -
Validation of higher-order approximations and boundary conditions for lossy conducting bodies
(Institute of Electrical and Electronics Engineers, 2014-09)The problem of high-frequency diffraction by a smooth lossy body with high conductivity is considered. In addition to the geometrical optics approximation, additional asymptotic terms are derived to take into account the ... -
Integral-equation study of ray effects and natural-mode resonances in a 2-D dielectric prism
(IEEE, 2015)We analyze the interplay of two different types of electromagnetic behavior demonstrated by a 2-D dielectric prism: Geometrical Optics and resonance. As it is shown, the first is responsible, for instance, for enhanced ... -
Manipulation of backscattering from a dielectric cylinder of triangular cross-section using the interplay of go-like ray effects and resonances
(Institute of Electrical and Electronics Engineers, 2015)A triangular dielectric cylinder (dielectric prism) of the size, in cross-section, comparable to or moderately larger than the wavelength is a scatterer, which blends together two different types of electromagnetic behavior: ... -
Feasibility study of installation of solar panels on a high power HF antenna terrain
(EMC Türkiye, 2015) -
A new approach to diffraction modelling for line-of-sight (LOS) paths
(IEEE, 2015)In this paper, we present a new knife-edge diffraction method based on Bullington method for the terrestrial line-of-sight (LOS) paths. The diffraction loss of our new knife-edge diffraction method is compared with the ... -
Multipath fading effect on terrestrial microwave LOS radio links
(IEEE, 2015-07)In this paper, the calculation of both the total received power with the effect of the ground reflection and the fade margin to find out the link availability for terrestrial microwave LOS (line-of-sight) radio links is ... -
Feasibility study of installation of solar panels on a high power HF antenna land
(John Wiley and Sons Inc., 2016)In HF broadcasting, the transmitters are typically very powerful. In the case of Turkish Radio and Television (TRT), total transmission average power may reach up to 5 MW. Therefore, it is natural to utilize solar panels ... -
Short-term propagation measurements and modeling for terrestrial line-of-sight links
(IEEE, 2016)This paper presents a propagation prediction technique to predict propagation mechanisms for fixed terrestrial line-of-sight (LOS) radio links, especially proposed for rural environments. We report the results of a short-term ... -
Optical characterization of high and low resistive silicon samples suitable for reconfigurable antenna design
(Wiley Periodicals, Inc., 2018)Highly resistive (HR) silicon (Si) can behave as a switch when illuminated by optical source of suitable wavelength. Different reconfigurable passive structures, such as filters, waveguides, and antennas, can be constructed ...
