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 22 for “"oversampled"”.
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Oversampled pipline A/D converters with mismatch shaping
This thesis introduces a technique to improve the linearity of pipeline analog to digital converters (ADC). Through a combination of oversampling and mismatch shaping, the distortion introduced by component mismatch is modulated out of the input signal frequency band, where it can be removed by …
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*Multidimensional Multirate Systems: Characterization, Design, and Applications
… filter banks, including critically sampled and oversampled ones. Characterizing and designing multidimensional perfect reconstruction filter banks have been challenging tasks. For critically sampled filter banks, previous one-dimensional theory cannot be extended to the multidimensional case due …
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Aumento della risoluzione spaziale per il sondaggio di temperatura e umidità da satellite geostazionario mediante radiometria ad onde millimetriche e submillimetriche
… Wiener filter improved resolution of the largely oversampled images by a factor 1.5- 2.0 without introducing any penalty in the radiometric accuracy. Super-resolution, suitable for not largely oversampled images, improved resolution by a factor ~1.5 but introducing an increased radiometric noise …
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Recovery of sparse signals and parameter perturbations from parameterized signal models
… able to produce sparse recoveries without highly oversampled dictionaries and actually produces sparser solutions than standard sparse recovery techniques with oversampled dictionaries.
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Design and implementation of discrete-time filters for efficient sampling rate conversion
… used in an array of applications, including the oversampled audio and video CODECs often found in entertainment and communications systems. It is common practice for many such systems to sample signals at rates which are much faster than the minimum required to represent some bandwidth of …
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Digital pulse processing
… the first-order sigma-delta modulation used in oversampled noise-shaping converters. The encoder circuits are well known and have simple construction using both current and next-generation technologies. Processing in the pulse-domain provides many benefits including: lower area and power …
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Distortion-optimal parallel MRI with sparse sampling: from adaptive spatio-temporal acquisition to self-calibrating reconstruction
… rate but the overall multi-channel system is oversampled. We address the feasibility of perfect reconstruction (PR) using short finite impulse response (FIR) synthesis filters given an oversampled but otherwise general FIR analysis filter bank (FB). We provide prescriptions for the shortest …
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Custom High-Speed ADC for mmWave Digital Beamformers
… a nascent idea of using a reconfigurable, oversampled 1-bit converter to achieve a high signal bandwidth and lower power consumption for future use in mm-Wave 5G radios or phased array systems. The following sections introduces the design process and architecture of a multi-stage …
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Exploring individual differences in the affective dynamics of bipolar spectrum psychopathology
… affective dynamics. Young- adults (n=233) oversampled for high HPS scores completed self-report questionnaires and 14 days of experience sampling questionnaires assessing emotional valence and arousal. Computational approaches examined the time-series of each participant. Bipolar spectrum …
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High Throughput Screening of Aptamers
… of known aptamers for small molecules, from an oversampled library. We also demonstrated HTSA's superior ability to enrich undersampled RNA libraries without any cycling, by successfully isolating high affinity binding sequences against <em>Cryptosporidium Parvum</em> oocysts and two of its …
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Empirical Studies on Early Childhood Education in Germany
… not representative because children at risk are oversampled. Altogether, the different studies suggest that parental investment (economic resources or non-economic resources) in children explain, at least to some extent, the development of cognitive and noncognitive skills as well as the child's …
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Theory and applications of delta-sigma analogue-to-digital converters without negative feedback
… analog components. In conventional oversampled modulators, negative feedback is applied in order to control the dynamic behavior of a system and to realize the attenuation of the quantization noise in the signal band due to noise shaping. However, feedback can also introduce …
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Ambulatory assessment of physiological arousal, emotion, and alcohol use
… The current project enlisted participants (n=43) oversampled for affective instability, arguably making them at higher risk for negative affect-driven alcohol consumption. The goals of this study were to 1) validate an ambulatory device for measuring electrodermal activity (EDA) and to 2) examine …
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Channelization for Multi-Standard Software-Defined Radio Base Stations
… but computational load is only reduced for oversampled configurations and then not as much as for the multi-stage designs. Both techniques render the implementation of GDFT-FB based non-uniform channelizers more practical. Finally, channelization solutions for some real-world spectrum …
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Fast all-digital carrier synchronization techniques for linear modulation formats
… an all-digital phase-locked loop (APDLL). When oversampled, it performs just as well as an equivalent analog phase-locked loop (PLL) relative to BER degradation, variance, and transfer function characteristic. The ADPLL is stable and displays a wide tracking range, up to half of the sampling …
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Sampling and quantization for optimal reconstruction
… quantization in the environment of interleaved, oversampled multi-channel measurements with the potential of different quantization step size in each channel and varied timing offsets between channels. Considering sampling together with quantization in the digital representation of the …
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Timing offset and quantization error trade-off in interleaved multi-channel measurements
… are always uniform, while solution sets for oversampled systems are larger. Systems with diverse bit allocations often exhibit "clusters" of low-precision channels in close proximity. Genetic optimization is shown to be effective for quickly and accurately determining optimal timing …
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Materials and Surface Processes at Gale Crater and the Moons of Mars Derived from High Spatial and Spectral Resolution Orbital Datasets
… during accretion or a late stage impact.</p><p>Oversampled visible/near-infrared hyperspectral data over Mt. Sharp in Gale Crater are used to generate spatially sharpened maps of the location of red crystalline hematite within the uppermost stratum of a ~6.5 km long ridge on the mound's northern …
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