Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 262 for “"Peak Power"”.
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Modelling high peak-power solid-state lasers
… and can severely impact the performance of highpower lasers, especially Q-switched systems.;This model confrimed expectations around a novel rod geometry for suppression in high-power solid-state gain medium that could see benefits for Q-switched systems. These recommendations are the first …
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Peak power reduction algorithms in ADSL modems
This thesis investigates peak-to-average ratio (PAR) reduction techniques for multicarrier modulation systems, such as discrete multitone (DMT) modems and orthogonal frequency-division multiplexed (OFDM) terrestrial broadcast transmitters. Through simulation and test implementation on a …
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Shape Up: Peak -Power Reduction via Constellation Shaping
… and hyperdiamond shaping reduce the unclipped peak power by 5 to 7 dB with no loss of data rate and with a symbol error rate that is virtually identical to that of conventional systems. With a clipping rate of 10-8, they still provide up to 2.8 dB of peak-power reduction. Algebraic shaping …
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Peak power tracking for a solar buck charger
… and testing of a buck converter with peak power tracking. The peak power tracker uses a perturb and observe algorithm to actively track the solar panel's peak power point and a global sweep algorithm accounts for startup and multiple local maxima. The tracker takes the place of the …
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Peak power reduction in orthogonal frequency division multiplexing transmitters
… This thesis describes the issue of the Peak to Average Power Ratio (PAPR) in OFDM which is a major drawback, and presents new and variations to existing algorithms to reduce it.
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Fast peak-power reduction for MIMO-OFDM systems with diversity
A robust peak-power reduction technique called active constellation extension (ACE) reduces the peak-to-average power ratio (PAPR) of single-input single-output (SISO) orthogonal frequency-division modulated (OFDM) signals by extending the outer constellation points in a way that minimizes the PAPR …
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Analysis and design of microprocessor-controlled peak-power-tracking system
Analyses and designs of a peak-power tracking system using microprocessor control are performed. Large-signal stability of the system for various modes of operation is analyzed to predict system dynamics. The stability analysis is supported mainly by qualitative graphical representations of …
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Determining application-specific peak power and energy requirements for ultra-low-power processors
… wearables, implantables, and sensor networks are power- and energy-constrained. These applications rely on ultra-low-power processors that have rapidly become the most abundant type of processor manufactured today. In the ultra-low-power embedded systems used by these applications, peak power and …
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Photonic bandgap fibers for transmitting high peak-power pulses in the near infrared
… them viable candidates for transmitting high-peak power pulses. This thesis demonstrates the fabrication and characterization of polymer-composite PBG fibers in a novel materials system, polycarbonate and arsenic sulfide glass. Propagation losses for the 60pm-core fibers are less than 2dB/m, a …
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Towards mitigating co-incident peak power consumption and managing energy utilization in heterogeneous clusters
… suffer a significant cost in terms of energy and power consumption. To address this cost we have developed our own framework, Electron, for use with Mesos. Electron is designed to be configurable with heuristic-driven power capping policies along with different scheduling policies such as Bin …
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Integration and operation of post-combustion capture system on coal-fired power generation: load following and peak power
Coal-fired power plants with post combustion capture and sequestration (CCS) systems have a variety of challenges to integrate the steam generation, air quality control, cooling water systems and steam turbine with the capture system. A variety of engineering studies have been completed that cover …
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Analysis of the peak power of a photovoltaic array system under outdoor conditions at Vuwani Region of Limpopo Province
… to record some of the main parameters such as peak power and air temperature. The estimated data of solar radiation are used in the present work. The photovoltaic array was connected to the maximum power point tracking (MPPT) charge controller to record daily peak power value produced by the …
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Input-Pattern-Independent Estimation of Peak Current, Peak Power Dissipation, and Maximum Voltage Variation in the Power Distribution Network of VLSI Circuits
… the computation of maximum switching activity, peak current for programmable logic arrays (PLAs), peak current envelope for static circuits, maximum leakage current, and the maximum voltage variation in the power distribution network. Comparisons with the results obtained by exhaustive …
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Effects of a single-leg exercise training intervention on single and double leg peak power output, maximal oxygen consumption, gas exchange threshold, and the respiratory compensation point
… double-leg cycling facilitating for more power with lower cardiovascular effort. This study examined the effects of a counterweighted single-leg cycling training program on single-leg and double-leg cycling performance during a ramp incremental test to exhaustion. Ten cardiovascular …
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THE EFFECT OF RELATIVE ELECTRODE SIZE ON THE PERFORMANCE OF A SUPERCAPACITIVE MICROBIAL FUEL CELL DESIGN
… the effect on capacitance and delivered power quality. The cathode size was determined to be the limiting component of the system, while anode size showed little effect on the devices performance. By doubling the cathode area, peak power output was improved by roughly 120% for a 10 ms …
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A Framework of a Power Management System for a Hybrid Electric VTOL Aircraft using Optimal Control
… is used to assess the effects of MHPS electric power hybridization, energy hybridization mass ratio, and peak power output on UAV performance during demanding phases of flight, which include takeoff, landing, and hover. Results showed that the most time and energy efficient takeoff trajectories …
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Suspended stripline filters for ultrawide bandwidth and high RF power
… the design, synthesis, and measurement of high peak power ultra-wideband filters in suspended stripline. Ultra-wideband pre-selector filters play a vital role in current electronic warfare systems as they are expected to cover a wide passband and handle high power simultaneously. Suspended …
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Reliability of a Gaussian channel in the presence of Gaussian feedback
… White Gaussian Noise channel was studied under a peak power constraint, in the presence of a feedback channel that was also a continuous time peak-power constrained infinite bandwidth Additive White Gaussian Noise channel. Motivated by [9], a two phase scheme was studied, where, in the first …
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Low Power High Fault Coverage Test Techniques for Digital VLSI Circuits
… These challenges include keeping the average and peak power dissipation and test application time within acceptable limits. This dissertation proposes techniques to addresses these challenges during test. The first proposed technique, called bit-swapping LFSR (BS-LFSR), uses new observations …
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