Sökning: "mobile terminals"

Visar resultat 1 - 5 av 38 avhandlingar innehållade orden mobile terminals.

  1. 1. Mobile Satellite Broadcast and Multichannel Communications : analysis and design

    Författare :Cristoff Martin; Björn Ottersten; Jack Winters; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; communications; satellite broadcast; mobile; MIMO; asymptotic analysis; spatial multiplexing; Signalbehandling; Signal processing; Signalbehandling;

    Sammanfattning : In this thesis, analytical analysis and design techniques for wireless communications with diversity are studied. The impact of impairments such as correlated fading is analyzed using statistical models. Countermeasures designed to overcome, or even exploit, such effects are proposed and examined. LÄS MER

  3. 2. Evolution of Techno-Economic Systems - An Investigation of the History of Mobile Communications

    Författare :Sven Lindmark; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mobile data communications; application diversification; mobile telephony; standards; complementarities; diffusion; techno-economic systems; convergence; competition; technological change;

    Sammanfattning : The purpose of this thesis is to contribute to the understanding of how techno-economic systems emerge and evolve and how such processes can be analyzed. To these ends, the history of mobile communications is investigated, seen as a complex techno-economic system with two rapidly evolving and interacting subsystems - mobile telephony and mobile data communications - which are described, dissected and compared in case studies. LÄS MER

  4. 3. Antennas and Antenna Measurement Techniques for Mobile Communication Terminals

    Författare :Paul Hallbjörner; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Mobile communication is expanding rapidly, finding new uses and pushing the development of terminals. There are many systems in use today, for example mobile phone systems for voice communication, satellite navigation/positioning systems, and short range data communication. LÄS MER

  5. 4. Wideband Active and Passive Antenna Solutions for Handheld Terminals

    Författare :Peter Lindberg; Anders Rydberg; Anders Pers; Nicholas Buris; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering physics; active antennas; impedance matching; dipole antennas; baluns; slot antennas; microstrip antennas; mobile antennas; multifrequency antennas; antenna proximity factors; receiving antennas; ferrite devices; Teknisk fysik;

    Sammanfattning : This thesis presents solutions and studies related to the design of wideband antennas for wireless handheld terminal applications. A method of electrically shortening the terminal chassis length to obtain resonance at high frequencies has been proposed and evaluated, thereby increasing the antennas impedance bandwidth. LÄS MER

  7. 5. Reducing Energy Consumption through Adaptive Shutdown Scheduling on a Chip-Multiprocessor

    Författare :Mladen Nikitovic; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mobile terminals; CMP; energy; power consumption; scheduling;

    Sammanfattning : There is seemingly a never-ending consumer demand for mobileterminals such as cellular phones and personal digitalassistants (PDAs). Each new generation of terminals comes withmore elaborate functions than in the previous generation. LÄS MER