2002/4

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    Distributed Speech Recognition
    (Společnost pro radioelektronické inženýrství, 2002-12) Burget, L.; Motlicek, P.; Grezl, F.; Jain, P.
    This article discusses possibilities of integrating speech technology into wireless technology, allowing voice input for wireless devices. Distributed speech recognition concept and activities related to its standardization are presented. First ETSI DSR MFCC based standard is described. Work on its extension to improve robustness resulting in new standard is also presented.
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    Power Control Imperfection in CDMA Systems with Adaptive Antennas
    (Společnost pro radioelektronické inženýrství, 2002-12) Hrudkay, K.; Wieser, V.
    This paper deals with a simulation of cellular CDMA system using base station adaptive antennas. The model assumes two tiers area, four types of antennas, lognormal shadowing corresponding to three types of environments and perfect power control or two values of power control error, respectively. The capacity of system in up-link is evaluated by a number of mobile stations with higher signal to interference ratio than threshold with given outage probability.
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    Wireless Local Area Networks: A Comprehensive Guide
    (Společnost pro radioelektronické inženýrství, 2002-12) Pomenka, P.
    Nowadays the demand on exchange of information is higher and higher. During recent years rapid development of radio communication, both mobile and non-mobile has been experienced. Because of need of wider frequency range and expansive number of services using "the air" as the medium, higher frequencies have to be applied. This paper deals mainly with wireless LAN using license-free band such as 2.4GHz (ISM) or 5.2GHz.
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    Mutual Interference Models for CDMA Mobile Communication Networks
    (Společnost pro radioelektronické inženýrství, 2002-12) Wieser, V.; Hrudkay, K.
    Nowadays we are witnesses of a huge development one of the most progressive communication technology - mobile networks. The main problem in these networks is an elimination of the mutual interference, which, mainly in non-orthogonal CDMA networks, is the principal obstacle for reaching high transmission rates The aim of this contribution is to give simplified view to mutual interference models for orthogonal and non-orthogonal CDMA networks. The contribution is intended mainly for PhD. students to help them to obtain an orientation in such a complicated areas, as the interference models for CDMA networks are.
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    Mobile Access to the Internet
    (Společnost pro radioelektronické inženýrství, 2002-12) Novikmec, J.; Dobos, L.
    In this paper various aspects of mobile access to Internet are discussed. We mention general Internet protocols and mobile enhancements and also future models that will be used in near future.