Search for dissertations about: "cellular phones"

Showing result 1 - 5 of 25 swedish dissertations containing the words cellular phones.

  2. 1. Three problems with internetworking in cellular networks

    Author : Lars-Åke Larzon; []
    Keywords : ;

    Abstract : Over the last decade, cell phones have gone from providing the traditional interactive voice service to also include support for Internet services. Cellular networks that originally were designed for cost-efficient voice services supply low bandwidth, high error rates and long round-trip delays, which poorly fit the generous header sizes, lack of error tolerance and reliance on retransmissions of the Internet. READ MORE

  4. 2. Transport Analytics Based on Cellular Network Signalling Data

    Author : David Gundlegård; Johan M. Karlsson; Tommy Svensson; Linköpings universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Cellular networks of today generate a massive amount of signalling data. A large part of this signalling is generated to handle the mobility of subscribers and contains location information that can be used to fundamentally change our understanding of mobility patterns. READ MORE

  5. 3. Generating Road Traffic Information Based on Cellular Network Signaling

    Author : David Gundlegård; Johan M Karlsson; Di Yuan; Francisco Benitez; Linköpings universitet; []
    Keywords : ;

    Abstract : Cellular networks of today generate a massive amount of signalling data. A large part of this signalling is generated to handle the mobility of subscribers, irrespective of the subscriber actively uses the terminal or not. Hence it contains location information that can be used to fundamentally change our understanding of human travel patterns. READ MORE

  6. 4. Studies of Three Different Methods to Estimate the Up-link Performance of Mobile Phone Antennas

    Author : Sathyaveer Prasad; Peter Händel; Claes Beckman; Jan Carlsson; Högskolan i Gävle; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Antenna measurements; mobile phones; total radiated power; reverberation chamber; anechoic chamber; Telia Scattered Field Method; Maximum likelihood Estimator; Telecommunication; Telekommunikation;

    Abstract : Antennas play an important role in determining the overall radio performance for wireless communications. If all other radio components perform according to their specifications, the performance of a mobile phone can be entirely determined by measuring the efficiency of its antenna. READ MORE

  7. 5. Fast Power Control to Counteract Rayleigh Fading in Cellular Radio Systems

    Author : Anders Ericsson; Mille Millnert; Linköpings universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : In urban areas, cellular radio signals are subject to Rayleigh fading, which results in rapid changes in the channel gain. For TDMA-systems without the possibility of frequency hopping, this can cause severe problems for slowly moving cellular phones. READ MORE