Browsing by Author "Pelishok, V. O."

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    Adaptive antenna systems of telecommunication networks
    (Видавництво Національного університету "Львівська політехніка", 2009) Pelishok, V. O.
    In modern wireless telecommunication networks are widely used adaptation to change, for example, communication channel parametres. Adaptive modulation, the coding and so on is thus used, that considerably improves efficiency of systems. Recently adaptation also is used in antenna systems. Substantial increase of efficiency of wireless networks as a whole is thus reached. "Intellectual" antennas (Smart-antennas) which can change the form of the directional pattern depending on concrete circumstances in a communication channel, and ways of increase of their efficiency are investigated.
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    Research of multiantenna systems of telecommunication networks
    (Видавництво Національного університету "Львівська політехніка", 2009) Klimash, M. M.; Pelishok, V. O.; Yaremko, O. M.
    In the given work different types of multiantenna systems are investigated: with several aerials on transferring or on the reception party, and also on both parties simultaneously (MIMO, Multiple Input Multiple Output). Different kinds of processing of signals, as on transferring (STBC, Space-Time Block Coding) and on reciving to the party (BLAST, Bell Laboratories Layered Space-Time) are considered. Influence of multiantenna systems on the basic indicators of wireless neetworks (probability of occurrence of bit errors, speed of transfer data) is investigated.