Sökning: "Telekommunikation"

Visar resultat 36 - 40 av 557 avhandlingar innehållade ordet Telekommunikation.

  1. 36. Adaptive MIMO Systems with Channel State Information at Transmitter

    Författare :Jinliang Huang; Svante Signell; Øien Geir; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; adaptive modulation; adaptive power allocation; average spectral efficiency; MIMO; BER.; Telecommunication; Telekommunikation;

    Sammanfattning :  This dissertation presents adaptation techniques that can achieve high spectral efficiency for single user multiple-input multiple-output (MIMO) systems. Two types of adaptation techniques, adaptive modulation and adaptive powe allocation, are employed to adapt the rate and the transmit power to fading channels. LÄS MER

  3. 37. Access selection in multi-system architectures : cooperative and competitive contexts

    Författare :Johan Hultell; Jens Andersson; Heikki Hämmäinen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Telecommunication; Telekommunikation;

    Sammanfattning : Future wireless networks will be composed of multiple radio access technologies (RATs). To benefit from these, users must utilize the appropriate RAT, and access points (APs). In this thesis we evaluate the efficiency of selection criteria that, in addition to path-loss and system bandwidth, also consider load. LÄS MER

  4. 38. Cooperative and non-cooperative wireless access : Resource and infrastructure sharing regimes

    Författare :Johan Hultell; Jens Zander; Cristina Comaniciu; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; radio resource managment competition cooperation game theory; Telecommunication; Telekommunikation;

    Sammanfattning : Future wireless networks will combine multiple radio technologies and subsystems, possibly managed by competing network providers. For such systems it may be advantageous to let the end nodes (terminals) make some or all of the resource management decisions. LÄS MER

  5. 39. Impairment Mitigation in High Capacity and Cost-efficient Optical Data Links

    Författare :Miguel Iglesias Olmedo; Sergei Popov; Gunnar Jacobsen; Richard Schatz; Marco Santagustina; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Phase Noise; Short range interconnects; Metro; Telecommunication; Telekommunikation;

    Sammanfattning : The work presented in this thesis fits within the broader area of fiber optics communications. This is an important area of research as it provides a breeding ground for the present and future technologies supporting the Internet. LÄS MER

  7. 40. Radio Frequency Power Amplifiers : Behavioral Modeling, Parameter Reduction, and Digital Predistortion

    Författare :Magnus Isaksson; Peter Händel; José C. Pedro; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Telecommunication; Telekommunikation; Electronics;

    Sammanfattning : This work considers behavioral modeling, parameter-reduction, and digital predistortion of radio frequency power amplifiers. Due to the use of modern digital modulation methods, contemporary power amplifiers are frequently subjected to signals characterized by considerable bandwidths and fast changing envelopes. LÄS MER