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  • An ultra low power frequency reference for timekeeping applications

    Creator:
    Oporta, Hector Ivan
    Abstract:
    An ultra low power crystal oscillator that provides a frequency reference for battery powered timekeeping applications is presented. An amplitude control circuit is employed to ensure that minimum current is consumed. A subthreshold voltage regulator provides a supply voltage for the oscillator with minimum current consumption. The oscillator and regulator...
    Resource Type:
    Masters Thesis
    Full Text:
    Ultra Low Power Frequency Reference For Timekeeping Applications Abstract approved: Terri S. Fiez

  • A Wide Modulation Range and PVT-Tolerant Spread-Spectrum Modulation Clock Generator

    Creator:
    Sun, Hyuk
    Abstract:
    This dissertation presents a phase domain in-loop-bandwidth spread-spectrum clock generation technique. In this proposed technique, a charge-based discrete-time loop filter is proposed to enable the phase domain in-loop-bandwidth spread-spectrum modulation without a delta-sigma modulator or time-to-digital converter. The in-loop-bandwidth modulation technique maximizes the loop bandwidth to improve phase noise suppression...
    Resource Type:
    Dissertation
    Full Text:
    trade-offs: between reference frequency and spread-spectrum modulation range, and between the spread

  • Design and analysis techniques for nano-joule ADCs and sampling linearity

    Creator:
    Brown, Thomas (Thomas William)
    Abstract:
    Two aspects of ADC system performance are addressed in this work. First, the combination of the ADC and its associated reference are co-designed for an energy constrained remote sensing system. Second, sampling linearity is mathematically analyzed as a function of frequency to provide enhanced understanding into an ADC's requisite sampling...
    Resource Type:
    Dissertation
    Full Text:
    ADC and its associated reference are co-designed for an energy constrained remote sensing system

  • Receiver synchronization for UWB TDOA localization

    Creator:
    Baek, Seungjin
    Abstract:
    Pulsed ultra-wideband (UWB) radio uses extremely short pulses to transmit information. Such pulses provide very fine timing information, which has led to technological advances in high-precision localization. This thesis investigates UWB localization strategies with a focus on receiver synchronization algorithms for time-difference-of-arrival localization to achieve centimeter accuracies in a 3-dimensional...
    Resource Type:
    Masters Thesis
    Full Text:
    reference transmitter, several receivers each with a sampling module and a wireless local area network

  • Low-power video decoding with dynamic voltage scaling

    Creator:
    Dixit, Reshma
    Abstract:
    This thesis investigates Dynamic Voltage Scaling (DVS) techniques to lower power consumption in video decoding. A DVS scheme called the Frame-data Computation Aware (FDCA) method has been presented. This method is adaptable not only to stored video applications but also to real-time video scenarios. Unlike DVS schemes for video decoding...
    Resource Type:
    Masters Thesis
    Full Text:
    an average of about 68%. ©Copyright by Reshma Dixit

  • Pulsed ultra-wideband: transmission, detection, and performance

    Creator:
    Zhao, Shiwei
    Abstract:
    Ultra-wideband (UWB) communication has emerged as a very promising technology for short-range wireless applications, including high-speed multimedia transmissions and sensor networks. UWB system designs involve many different aspects covering analog and digital processing, channel estimation and modeling, and modulation and demodulation. Although UWB still faces many challenges, significant progress has...
    Resource Type:
    Dissertation
    Full Text:
    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 6 HYBRID ULTRAWIDEBAND MODULATIONS COMPATIBLE FOR BOTH COHERENT AND TRANSMIT-REFERENCE RECEIVERS

  • Urban military operation mobility model

    Creator:
    Kang, Ho Sung
    Abstract:
    A Mobile Ad-hoc NETwork (MANET) is collection of wireless mobile nodes without a network infrastructure or centralized administration. Although MANETs can be used in many applications, such as mobile Internet, military communication, and disaster relief networks, a number of challenges remain. These include routing, medium access control, security, scalability, energy...
    Resource Type:
    Masters Thesis
    Full Text:
    . proposed the Reference Point Group Mobility (RPGM) [1] model, which relates a group movement by a

  • A Microwave Signal Correlator Based on Parametric Pumping of Spin Waves

    Creator:
    Hansen, Mikkel N.
    Abstract:
    This work demonstrates correlation of microwave signals encoded with 16-bit codes using the parametric interaction of spin waves. Signal processing correlators are devices that compare two signals, such as a reference code and a received code, where the output indicates the similarity between the signals. Correlators are used in communication...
    Resource Type:
    Masters Thesis
    Full Text:
    reference code and a received code, where the output indicates the similarity between the signals

  • Time-based noise-shaping techniques for time-to-digital and analog-to-digital converters

    Creator:
    Young, Brian LeRoy
    Abstract:
    In this dissertation, time-based signal processing techniques and their applications in oversampling and noise-shaping data converters are examined. These techniques demonstrate the ability to shift the burden of high performance analog circuits from the compressed voltage-domain to the augmented time-domain. First, the potential of high order noise-shaping and phase-domain feedback...
    Resource Type:
    Dissertation
    Full Text:
    feedback in time-to- digital converters (TDCs) is explored. A prototype phase reference, second-order

  • Towards Direct Simultaneous Speech Translation

    Creator:
    Chen, Junkun
    Abstract:
    Simultaneous speech translation (SimulST) is widely useful in many cross-lingual communication scenarios, including multinational conferences and international traveling. Since text-based simultaneous machine translation (SimulMT) has achieved great success in recent years. The conventional cascaded approach for SimulST uses a pipeline of streaming ASR followed by simultaneous MT but suffers from...
    Resource Type:
    Dissertation
    Full Text:
    6, 2022. Title: Towards Direct Simultaneous Speech Translation Abstract approved: Liang Huang