Communications and Spectrum Management Research Center (ISYAM)

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Browsing Communications and Spectrum Management Research Center (ISYAM) by Author "Köymen, Hayrettin"

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    Computer aided frequency planning for the radio and TV broadcasts
    (Institute of Electrical and Electronics Engineers, 1996-06) Altıntaş, Ayhan; Ocalı, O.; Topçu, Satılmış; Tanyer, S. G.; Köymen, Hayrettin
    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 the channel capacity. The offset assignment is done through simulated annealing algorithm. The international rules and regulations concerning Turkey are also considered.
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    Design of an emergency PMR network based on CDMA 450 in İstanbul metropolitan region
    (TEHOSS, 2006) Kızılırmak, Çağlar; Topçu, Satılmış; Köymen, Hayrettin
    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 tool. Trade off between several system parameters such as quality of service, user mobility, traffic distribution, data rate and bandwidth are considered to optimize the capacity and coverage of the network. Coverage and handoff areas are shown on the map by the aid of GIS (Geographical Information Systems) tool. System capacity and coverage are presented as the main results of the proposed network.
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    A GIS-Aided frequency planning tool for terrestrial broadcasting and land mobile services
    (Springer, Dordrecht, 2002) Topçu, Satılmış; Köymen, Hayrettin; Altıntaş, Ayhan; Aksun, İrşadi; Briggs, D. J.; Forer, P.; Järup, L.; Stern, R.
    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 early warning of disasters and advice on how to respond to the public, and a means of monitoring of events and follow-up work in the wake of a disaster. Effective telecommunications are thus a vital part of emergency planning and response (Cate 1994, DHA 1995, Mulilis 1995, Zimmerman 1997). How well radio-based systems work, however, depends on a range of factors, including their geographic coverage, their population coverage, their field strength and their received power level. All these factors are highly dependent upon terrain. Moreover, due to the growing demands on the radio-frequency spectrum, there is a need to improve spectrum management techniques. The increase in the shared use of spectrum among administrations requires the use of more complex analysis methods. The efficient solution of spectrum managementproblems depends upon data storage and analysis capabilities, andconsequently requires the application of computer-aided techniques for data management and frequency assignment.
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    GIS-Aided propagation prediction study for broadcast and telecommunication services
    (2000) Altıntaş, Ayhan; Aksun, İrşadi; O., Balta; Köymen, Hayrettin; Topçu, Satılmış; Yurchenko, V.
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    Outdoor propagation models: applications and considerations for real life problems
    (IEEE, 2003) Altıntaş, Ayhan; Topçu, Satılmış; Köymen, Hayrettin; Moral, Gökhan; Yılmaz, Özgür
    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 communication is discussed. The results indicate that the field strength predictions depend on the implementation of the model.
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    Propagation prediction and planning tools for digital and analog terrestrial broadcasting and land mobile services
    (2000) Topçu, Satılmış; Köymen, Hayrettin; Altıntaş, Ayhan; Aksun, İrşadi
    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 efficiently, administrations need to use advanced Automated Spectrum Management Systems (ASMS) which would facilitate national spectrum management and monitoring, coordination among administrations and notification to International Telecommunication Union (ITU). This paper presents some of the spectrum engineering analysis and planning tools of the National Frequency Management System (NFMS) as part of the ASMS which has been developed for the administration of Turkey. This system includes a Relational Database Management System (RDBMS) to support a database containing frequency assignment data, licence holder data and equipment characteristics data. The software is integratedwith a Geographic Information System (GIS) and it has the capability of using digital terrain data and geographic data