Search for dissertations about: "back-off"

Showing result 1 - 5 of 21 swedish dissertations containing the word back-off.

  1. 1. Towards energy efficient protocols for active RFID

    University dissertation from Göteborg : Chalmers University of Technology

    Author : Björn Nilsson; [2007]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; RFID; active RFID; protocol; back-off; carrier sense; energy efficient; wireless networks; active tag; energy consumption; TECHNOLOGY Information technology Computer engineering; TEKNIKVETENSKAP Informationsteknik Datorteknik;

    Abstract : The absence of a global standard is a bottleneck when using Radio Frequency Identification (RFID) technology. This thesis explores data communication protocols for Active-RFID regarding their energy efficiency and how they can be suited to fit a large variety of applications. READ MORE

  2. 2. Energy Efficient Protocols for Active RFID

    University dissertation from Göteborg : Chalmers University of Technology

    Author : Björn Nilsson; [2010]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; wake-up radio; energy consumption; energy efficient; Active RFID; protocol; RFID; throughput; back-off; RFID-system; delay;

    Abstract : Radio frequency identification (RFID) systems come in different flavours; passive, active, semi-passive, or semi-active. Those different types of RFID are supported by different, internationally accepted protocol standards as well as by several accepted proprietary protocols. READ MORE

  3. 3. Theory and Design of Wideband Doherty Power Amplifiers

    University dissertation from Göteborg : Chalmers University of Technology

    Author : David Gustafsson; [2012]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Doherty; gallium nitride; GaN; power amplifier; MMIC; microwave; Broadband amplifiers; high efficiency; wideband;

    Abstract : The Doherty power amplifier (DPA) is one of the most popular power amplifier architectures for obtaining high average efficiency for modern communication signals with high peak-to-average power ratios (PAPR). However, the DPA suffers from often having narrowband performance which limits its capabilities in wideband and/or multi-standard microwave and radio frequency applications. READ MORE

  4. 4. Towards Energy Efficient Protocols for Active RFID

    University dissertation from Göteborg : Chalmers University of Technology

    Author : Björn Nilsson; [2007]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : The absence of a global standard is a bottleneck when using Radio FrequencyIdentification (RFID) technology. This thesis explores data communication protocols forActive-RFID regarding their energy efficiency and how they can be suited to fit a largevariety of applications.The use of Radio Frequency Identification systems (RFID) is growing rapidly. READ MORE

  5. 5. High efficiency power amplifiers for wireless communications

    University dissertation from Gothenburg : Chalmers tekniska högskola

    Author : Hossein Mashad Nemati; [2009]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; load modulation; GaN; supply modulation; LDMOS; efficiency; Power amplifier; MMIC; mHEMT; transmitter architecture;

    Abstract : This thesis presents state-of-the-art high efficiencyharmonically-tuned power amplifiers (PAs) and investigates thecharacteristics and potentials of such amplifiers in two of the mostpromising efficiency enhancement techniques, dynamic supply and load modulation.In this work, a 10 W LDMOS harmonically-tuned PA with 80% power-added-efficiency (PAE) isrealized at 1 GHz. READ MORE