Sökning: "Ulf Gustavsson"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden Ulf Gustavsson.

  1. 1. From Noise-Shaped Coding to Energy Efficiency - One bit at the time

    Författare :Ulf Gustavsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; radio frequency power amplifier; power efficiency; ΣΔ-modulation;

    Sammanfattning : Three parameters that drive the research and development of future RF transmitter technologies for high speed wireless communication today are energy efficiency, flexibility and reduction of the physical footprint. This thesis treats the use of single-bit quantization in conjunction with a method called Noise-Shaped Coding (NSC), as an enabler for these parameters, foremost in terms of energy efficiency. LÄS MER

  3. 2. Quantization and Noise-Shaped Coding for High Efficiency Transmitter Architectures

    Författare :Ulf Gustavsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Software Defined Radio; Quantization; damped Gauss-Newton; Pulse Density Modulation; Noise-Shaped Coding; ΣΔ-Modulators; Power Amplifier;

    Sammanfattning : Three driving parameters in the development of transmitter technologies for wireless communication today is: energy efficiency, flexibility and footprint reduction. This thesis investigates the use of 1-bit oversampled signal representation, mainly as a power efficiency enhancement technique for the transmitter, but also as a path toward reduced footprint and increased flexibility. LÄS MER

  4. 3. IT i lokalsamhället : konsumentmakt eller operatörsdominans

    Författare :Stig Gustavsson; Ulf Keijer; Magnus Rönn; Mats Edenius; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; IT -infrastruktur; lokalsamhälle; öppna bredbandsnät; lokala nät; samhällsplanering; boende;

    Sammanfattning : Abstract Syftet med detta arbete var att studera  villkoren för att stärka  konsumenten s, den enskilde medborgarens, den boendes inflytande gentemot de kommersiella IT-aktörerna i samband med bredbandsutbyggnad i svenska kommuner. Det har varit  konsumentnyttan  vid utbyggnad av bredbandsnäten i svenska lokalsamhällen som har varit förem ålet för den föreliggande studien. LÄS MER

  5. 4. Occupational air pollutants and non-malignant respiratory disorders especially in miners

    Författare :Ulf Hedlund; Per Gustavsson; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; respiratory symptoms; occupational epidemiology; mining; asthma; airway inflammation; dust; diesel exhaust; quartz; chronic bronchitis; silicosis; Occupational and Environmental Medicine; arbets- och miljömedicin;

    Sammanfattning : Aim. To assess associations between occupational air pollution and respiratory health, especially in miners.Background. Indications of associations between occupational exposure or social economic status and respiratory health have been found in several population-based studies. LÄS MER

  7. 5. Characterization and Linearization of Multi-channel RF Power Amplifiers

    Författare :Shoaib Amin Amin; Peter Händel; Daniel Rönnow; Ulf Gustavsson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : The demands for high data rates and broadband wireless access require the development of wireless systems that can support wide and multi-band signals. To deploy these signals, new radio frequency (RF) front-ends are required which impose new challenges in terms of power consumption efficiency and sources of distortion e.g., nonlinearity. LÄS MER