Sökning: "high-frequency noise"

Visar resultat 1 - 5 av 103 avhandlingar innehållade orden high-frequency noise.

  1. 1. High Frequency Tyre Vibrations

    Författare :Patrik Andersson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; local deformation; adhesion; tyre model; air pumping; parameter study; tyre road noise; tyre road prediction models; tyre noise;

    Sammanfattning : High frequency (above 1 kHz) noise generation from the tyre/road interaction is still not fully understood and accurately modelled.Two noise generation mechanisms previously suggested in the literature are reviewed: air pumping and noise generation cased by adhesive effects between the tyre tread and road surface. LÄS MER

  3. 2. High Frequency Characterization and Modeling of SiGe Heterojunction Bipolar Transistors

    Författare :B. Gunnar Malm; KTH; []
    Nyckelord :Silicon-Germanium SiGe ; heterojunction bipolar transistor HBT ; low-frequency noise; high-frequency noise; harmonic distortion; linearity; device simulation; collector profile; epitaxial base integration; radio frequency RF ; radio frequency inte;

    Sammanfattning : .... LÄS MER

  4. 3. Fast Adaptive Numerical Methods for High Frequency Waves and Interface Tracking

    Författare :Jelena Popovic; Olof Runborg; Hongkai Zhao; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; high frequency waves; Helmholtz equation; interface tracking; time-space adaptivity; multiresolution; Hamilton-Jacobi;

    Sammanfattning : The main focus of this thesis is on fast numerical methods, where adaptivity is an important mechanism to lowering the methods' complexity. The application of the methods are in the areas of wireless communication, antenna design, radar signature computation, noise prediction, medical ultrasonography, crystal growth, flame propagation, wave propagation, seismology, geometrical optics and image processing. LÄS MER

  5. 4. Multi-Gigabaud Millimeter-Wave Communication - Challenges and Solutions

    Författare :Jingjing Chen; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; phase noise; high-order modulation; 5G; multi-gigabaud; PAM-4; high data rate; white noise; multi-gigabit; phase noise mitigation; 64-QAM; mobile backhaul; VCSEL driver; Frequency multiplier; modem; high frequency oscillator; multiplicative noise; power detector; fronthaul; millimeter-wave communication;

    Sammanfattning : A major challenge in future mobile networks is to overcome the capacity barrier in wireless communication. Utilizing large bandwidth at higher frequencies is key to enabling capacity upgrade for next generation mobile networks (5G). LÄS MER

  7. 5. InAs/AlSb HEMTs for Cryogenic Low-Noise Applications

    Författare :Giuseppe Moschetti; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cryogenic; metamorphic; high frequency; high electron mobility transistor HEMT ; low power; low noise.; InAs AlSb;

    Sammanfattning : The InAs/AlSb high electron mobility transistor (HEMT) is an emerging microwave device technology. The high electron mobility and high peak electron velocity of the InAs channel makes this device technology a potential candidate for low-noise applications operating at very low power dissipation. LÄS MER