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Existing analog video broadcasting transmission systems are very sensitive to interference from other analog video signals and require high co-channel protection ratio. Terrestrial digital video broadcast systems are significantly less sensitive to noise and interference. DVB-T systems with digital COFDM modulation, multicarrier techniques and channel coding system ensure frequency spectrum efficiency...
This article gives calculation of the relative surface variation, for WiMAX cell, in percentage for covering particular modo of signal as a function of the WiMAX base station antenna heights. The first part of this paper gives a short description of WiMAX technology. Second part shows transmission modes in the WiMAX air interface, followed in the third part by mathematical approach for calculating...
This paper consider the principles of connecting geographically dislocated computer networks for special purposes, connected to the Internet through permanent broadband access line such as ADSL (asymmetrical digital subscriber line) and fiber optical connection, but that are also integrated in remote corporative network, aiming to make possible real time multimedia signals with the required quality...
Education and following processes, knowledge market and competition, are for long recognized on global level. Information communication technology fast growth and new generations great computer knowledge enables new teaching methods development. Until fifteen years ago focus was on computer who used primary CD and local networks as information media, and then it spread on Internet usage and numerous...
This paper deals with path loss calculation by using measurement results. This paper offers methodology for processing path loss measurement results. First part of the paper gives short introduction. Second part of the paper describes measurement results collection process. Third part of the paper offers methodology for processing measurement results. By using this methodology we can found real propagation...
Information communication technology offers new possibilities for improving existing education system. Distance education method carries numerous possibilities in every day organization of education process from almost unlimited, time and space, communication possibilities to learning method. Having that in mind, it is important to find the best possible provision of new methods and adequately, according...
In digital video signal transmission, many non-linear effects is occurring. For spectrum efficiency, amplifier linearity is needed. In the case of non-linear amplifier it is necessary to compensate this non-linearity with special additional units. This paper contains some methods trying to achieve this goal. The first group include methods where the power amplifier is fed with a signal having varying...
Extremely high peak power values are the major problem in digital terrestrial television (DVB-T). They are caused by multi-carrier modulation COFDM (coded orthogonal frequency division multiplex). This paper contains analysis of this problem from the aspect of theoretical peak power maximum and statistical analysis of the problem where DVB-T parameters are used
This article describes the process of planning digital television networks in Croatia. It describes the way of choosing methods and finding a suitable approach in planning. The methods are explained on an example of Croatian allotment. The result of the chosen approach is given in the conclusion of the article
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