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  • Real-time radioxenon measurement using a Compton-suppressed well-type phoswich detector for nuclear explosion monitoring

    Creator:
    Alemayehu, Bemnet
    Abstract:
    Radioxenon detection is a technique used to monitor nuclear explosion and verify the Comprehensive Nuclear-Test-Ban Treaty (CTBT). Because of an ultra-low concentration of radioxenon at radioxenon monitoring stations, radioxenon detection systems must have high sensitivity. This sensitivity is measured in terms of detector's minimum detectable concentration (MDC). It is required...
    Resource Type:
    Dissertation
    Full Text:
    Dosimetry lab at Oregon State University. The active shielding mechanism is integrated into the phoswich

  • Evaluation of partial discharge in inverter driven medium voltage propulsion coils

    Creator:
    Ramme, André
    Abstract:
    Advancements in power electronics to higher power levels and faster switching times allow new machine and systems designs, but also create higher stresses on electric machinery insulation. High performance, pulse-width modulated (PWM) inverters are now available for medium voltage drive systems, and are being considered by the U.S. Navy as...
    Resource Type:
    Dissertation
    Full Text:
    Systems Research Facility (MSRF) at Oregon State University (OSU). The tests were performed on

  • Modeling and simulation methods for RF MEMS VCOs

    Creator:
    Sankaranarayanan, Janakiram Ganesh
    Abstract:
    This work focusses on the modeling and the development of efficient coupled simulation techniques for MEMS based RF oscillators. High-level models for MEMS based varactors have been discussed and their accuracy issues are identified, based on comparisons with numerical simulations. A faster simulation approach based on the time-domain shooting method...
    Resource Type:
    Masters Thesis
    Full Text:
    VCOs by Janakiram Ganesh Sankaranarayanan A THESIS submitted to Oregon State University in

  • High-Resolution mm-wave Digitally Controlled Oscillator in CMOS

    Creator:
    Wang, Yunqi
    Abstract:
    All-digital PLLs promise flexible and precise frequency modulation continous-wave(FMCW) radar signal signal for 77GHz radar applications. Such PLLs require digitally-controlled oscillators(DCO) with wide frequency tuning range and high resolution to address a range of applications and low phase noise requirements. In this thesis, novel resonator structures with ne capacitance/inductance switching...
    Resource Type:
    Masters Thesis
    Full Text:
    submitted to Oregon State University in partial fulfillment of the requirements for the degree of

  • A survey on continuous-time modulators : theory, designs and implementations

    Creator:
    Gao, Xiaoran
    Abstract:
    Recently, delta-sigma modulation has become a widely applied technique for high-performance analog-to-digital conversion of narrow-band signals. Most of the early designs used discrete-time structure for good accuracy and good linearity. The transfer functions are independent of the clock frequency. However, high unity-gain bandwidths of the opamps are required to satisfy...
    Resource Type:
    Masters Thesis
    Full Text:
    Oregon State University in partial fulfillment of the requirements for the degree of Master of Science

  • Channel Estimation in TDD Massive MIMO Systems with Subsampled Data at BS

    Creator:
    Tian, Yichuan
    Abstract:
    Massive MIMO is a promising technique for future 5G communications due to its high spectrum and energy efficiency. To realize its potential performance gain, accurate channel state information at transmitter side (CSIT) is essential. Frequency division duplex (FDD) is widely employed by the most cellular systems today. However, it requires...
    Resource Type:
    Masters Thesis
    Full Text:
    Oregon State University in partial fulfillment of the requirements for the degree

  • Multi-User Massive MIMO Channel Estimation Based on Kalman Filters

    Creator:
    Yao, Zhaoda
    Abstract:
    In wireless communication, channel state information (CSI) is essential for data detection. Fast fading coefficients estimation is important in order to acquire accurate CSI. Kalman filters (KF) are widely used for real time parameter estimation and can be used to estimate the fast fading coefficients of a mobile communication channel....
    Resource Type:
    Masters Thesis
    Full Text:
    collection of Oregon State University libraries. My signature below authorizes release of my thesis to

  • High-performance delta-sigma analog-to-digital converters

    Creator:
    da Silva, Jose Barreiro
    Abstract:
    Multi-stage delta-sigma (ΔΣ) architectures, commonly known as MASH, are the preferred choice for analog-to-digital converters (ADCs) used in broadband communication applications, where high-resolution (above 14 bits) and high-bandwidth (several MHz) performances are required. Current state-of-the-art designs are capable of as much as 5-MS/s output data rates with 90-dB SNR. However,...
    Resource Type:
    Dissertation
    Full Text:
    Analog-to-Digital Converters by José Barreiro da Silva A THESIS submitted to Oregon State University

  • Novel power conditioning circuits for piezoelectric micro power generators

    Creator:
    Han, Jifeng
    Abstract:
    Advanced low power devices promote the development of micro power generators (MPGs) to replace the batteries to power them. Due to the trend in decreasing integrated circuit (IC) supply voltages, power supply designers are facing more and more serious challenges. The objective of this research is to design a power...
    Resource Type:
    Dissertation
    Full Text:
    A DISSERTATION submitted to Oregon State University in partial fulfillment of

  • Adaptive load balancing metric for WLANs

    Creator:
    Ryou, Jong bum
    Abstract:
    As the number of mobile devices accessing large-scale WLANs such as campus and metropolitan area networks increases, the need for load balancing among the cells becomes crucial. In addition, the network must also support some minimum handoff tolerance defined by an application. A number of load balancing techniques have been...
    Resource Type:
    Dissertation
    Full Text:
    submitted to Oregon State University in partial fulfillment of the requirements for the degree of Doctor