Sökning: "IF bandwidth"

Visar resultat 1 - 5 av 112 avhandlingar innehållade orden IF bandwidth.

  1. 1. Fair Treatment of Multicast Sessions and Their Receivers : Incentives for more efficient bandwidth utilization

    Författare :Patrik Österberg; Tingting Zhang; Kirk Martinez; Mittuniversitetet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; bandwidth allocation; cost allocation; fairness; multicast; Computer and systems science; Data- och systemvetenskap;

    Sammanfattning : Tjänster för strömmad media stiger kraftigt i popularitet, samtidigt som utbudet av denna typ av tjänster ökar. Internet protocol television (IPTV) med standardupplösning levereras redan till många hem, och högupplöst IPTV kommer att bli vanligt inom en relativt snar framtid. LÄS MER

  3. 2. Superconducting THz mixers based on MgB2 film

    Författare :Stella Bevilacqua; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; bolometers; IF bandwidth.; superconductors; MgB2; THz Detectors; mixers;

    Sammanfattning : Superconducting NbN hot electron bolometer (HEB) mixers are widely used in terahertz radio astronomy. Such mixers have superior performance compared to SIS and Schottky diode mixers at frequency above 1THz. However, their drawback is a limited IF bandwidth. LÄS MER

  4. 3. Study of MgB2 and YBa2Cu3O7-x Microbolometers for THz Sensing Applications

    Författare :Stella Bevilacqua; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; THz Detectors; bolometers; IF bandwidth; YBa2< sub>Cu3< sub>O7-x< sub>; Terahertz frequency; HEB; MgB2< sub>; noise; superconductors;

    Sammanfattning : In this thesis, two novel THz detectors based on magnesium diboride (MgB2)and yttrium barium copper oxide (YBa2Cu3O7-x) are presented. In particular,MgB2 superconductor is used for the investigation of hot-electron bolometer(HEB) mixers, while YBa2Cu3O7-x is explored in microbolometers for room-temperaturecoherent and incoherent detection. LÄS MER

  5. 4. Design Aspects of Fully Integrated Multiband Multistandard Front-End Receivers

    Författare :Adiseno; KTH; []
    Nyckelord :low-noise amplifier; mixer; RF front-end; wireless receiver; noise figure; linearity; bandwidth; dual-loop feedback;

    Sammanfattning : In this thesis, design aspects of fully integrated multibandmultistandard front-end receivers are investigated based onthree fundamental aspects: noise, linearity and operatingfrequency. System level studies were carried out to investigatethe effects of different modulation techniques, duplexing andmultiple access methods on the noise, linearity and selectivityperformance of the circuit. LÄS MER

  7. 5. Streaming Video over Unreliable and Bandwidth Limited Networks

    Författare :Hussein Aziz; Blekinge Tekniska Högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Streaming video; Mobile device; Frame splitting; Sub-frame crossing; Time Interleaving Robust Streaming; Region of Interest; Mean Opinion Score;

    Sammanfattning : The main objective of this thesis is to provide a smooth video playout on the mobile device over wireless networks. The parameters that specify the wireless channel include: bandwidth variation, frame losses, and outage time. LÄS MER