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 1721 for “"Offset"”.
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Space-Time Coding with Offset Modulations
… of Feher-patented QPSK (FQPSK-JR) and shaped offset QPSK (SOQPSK-TG) can be interpreted as both cross-correlated, trellis-coded quadrature modulation (XTCQM) and continuous phase modulation (CPM). Based on these representations, both modulations can be detected with near optimal bit error rate …
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Voltage-Offset Resistive Control for Photovoltaics
This thesis introduces voltage-offset resistive control (VRC) for photovoltaic (PV) applications that exhibits low sensitivity to solar irradiance changes. Although there are numerous control schemes and maximum power point tracking (MPPT) methods for PVs, few focus on maintaining low sensitivity …
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Vector offset operators for deformable organic objects.
… introduced with a deformation tool named Vector Offset Operator. Stress / strain graphs control the elastoplastic behaviour of the model. Strain creep, stress relaxation and hysteresis graphs control the viscoelastic behaviour of the model. External forces may be applied using motion paths …
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Antenna axis offset and intersection determination using GPS
… between VLBI stations, is the antenna axis offset. This offset is the distance between the secondary axis and the normal projection of the secondary axis onto the primary axis. For a non-intersecting axes antenna mounting, this offset is usually several metres in length. The accuracy of the …
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Advanced techniques for fast offset cancellation limit amplifiers
As the need for higher data rates to end users increases, new technologies are required. Passive optical networks promise a vast improvement over previous methods, but they require amplifiers which can quickly adapt to changing input power levels. This thesis proposes two methods for addressing …
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"Offset" as an instrument of national industrial policy
Thesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1991.
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Fast offset compensation for a 10Gbps limit amplifier
A novel offset voltage compensation method is presented that significantly modifies the existing tradeoff between control loop bandwidth, and therefore total compensation time, and total output jitter. The proposed system achieves comparable output jitter performance to traditional approaches while …
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Imaging of large offset ocean bottom seismic data
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1991.
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Traffic Adaptive Offset-Based Preemption for Emergency Vehicles
… traffic conditions. The method uses dynamic offsets which are adjusted using congestion levels to provide uninterrupted preempted green signal for the emergency vehicle throughout its route. By achieving a higher average emergency vehicle speed, this method promises faster emergency response …
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Kirchhoff Common Offset Migration Velocity Analysis via Differential Semblance
This work gives an efficient and fast approach to obtain an accurate velocity model for seismic imaging. An accurate velocity model is prerequisite for obtaining the image that represents the true underground geological structure: major evidence to explore for potential reservoirs and indicate …
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Pressure build-up in a reservoir with offset producers
Includes bibliographical references.
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Spoofing GPS receiver clock offset of phasor measurement units
… is to maximize the difference between the time offset of the PMU's receiver clock before and after the attack. Since the PMU uses this clock offset to compute a time-stamp for its measurements, an error in the receiver clock offset introduces a proportional phase error in the voltage or current …
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Time-Offset Fractional-N PLLs for Heterodyne FMCW SAR
… contains an investigation into the use of time-offset fractional-N phase locked loops (PLLs) for heterodyne frequency-modulated continuous-wave (FMCW) synthetic aperture radar (SAR) and the impact of spurii on such a system. Heterodyne receiver architectures avoid phenomena which limit the …
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Travel time inversion of multi-offset vertical seismic profiles
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1985.
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Beam scanning offset Cassegrain reflector antennas by subreflector movement
… Virginia Tech into techniques for beam scanning offset Cassegrain reflector antennas by subreflector translation and rotation. Background material relevant to beam scanning antenna systems and offset Cassegrain reflector antenna system is presented. A test case is developed based on the …
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Compensation of nonlinear distortion and frequency offset in OFDM systems
… to nonlinear distortion and frequency offset. This dissertation deals with applications of compensation schemes in OFDM systems to solve the sensitivity problems associated with nonlinear distortion and frequency offset in the systems. With regard to compensation of nonlinear distortion …
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Through barrier detection using surface enhanced spatially offset Raman spectroscopy
… samples obscured by an opaque barrier.;Spatially offset Raman spectroscopy provides a means of overcoming the limitation associated with conventional Raman spectroscopy since it is capable of providing a unique chemical fingerprint of the analyte understudy, even when obscuring barriers such as …
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