Sökning: "radio frequency measurement systems"

Visar resultat 16 - 20 av 62 avhandlingar innehållade orden radio frequency measurement systems.

  1. 16. Physical Layer Techniques for High Frequency Wireline Broadband Systems

    Författare :Eduardo Lins de Medeiros; Bredbandskommunikation; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Digital Subscriber Line; Multicarrier Modulation; Vectoring; Copper cables; Radio-over-Copper;

    Sammanfattning : This thesis collects contributions to wireline and wireless communication systems with an emphasis on multiuser and multicarrier physical layer technology. To deliver increased capacity, modern wireline access systems such as G.fast extend the signal bandwidth up from tens to hundreds of MHz. LÄS MER

  3. 17. Behavioural Modelling of Radio Frequency Power Amplifiers : An Evaluation of Some Block Structure and Neural Network Models

    Författare :Magnus Isaksson; Högskolan i Gävle; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electronics; Elektronik;

    Sammanfattning : This work considers behavioral modelling of radio frequency power amplifiers. Due to the use of modern digital modulation methods power amplifiers are nowadays subjected to signals having a considerable bandwidth and a fast changing envelope. LÄS MER

  4. 18. Modeling Analog to Digital Converters at Radio Frequency

    Författare :Niclas Björsell; Peter Händel; Niclas Keskitalo; Linus Michaeli; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ADC; Analog to Digital Converters; Signal processing; Telecommunication; Telekommunikation; Electronics;

    Sammanfattning : Det här arbetet handlar om att ta fram beteendemodeller av analog till digital omvandlare avsedda för tillämpningar i radiofrekvensområdet. Det gäller tillämpningar inom telekommunikation men även in test- och mätinstrument där omvandlingen från analoga till digitala signaler ofta är en prestandamässig flaskhals. LÄS MER

  5. 19. Nonlinear Characterization of Wideband Microwave Devices and Dispersive Effects in GaN HEMTs

    Författare :Sebastian Gustafsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; large-signal; dispersive effects; electron trapping; thermal coupling; HEMT; GaN; microwave; wideband;

    Sammanfattning : Measurements play a key role in the development of microwave hardware as they allow engineers to test and verify the RF performance on a system, circuit, and component level. Since modern cellular standards employ complex modulation formats with wider signal bandwidths to cope with the growing demand of higher datarates, nonlinear characterization using wideband stimuli is becoming increasingly important. LÄS MER

  7. 20. Low-Power Secondary Access to the TV and Aeronautical Bands

    Författare :Evanny Carol Obregon Gamarra; Jens Zander; Ki Won Sung; Ben Slimane; Jonas Kronander; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Secondary Access; Interference Management; TV band; Aeronautical Band; SRA - ICT; SRA - Informations- och kommunikationsteknik;

    Sammanfattning : The avalanche in mobile data consumption represents a big challenge for mobile operators. The efficient use of radio resources, e.g. technology, infrastructure and spectrum, is needed to meet the new capacity requirement in the mobile networks. LÄS MER