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 92 for “"Oversampling"”.
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Pipelined oversampling analog-to-digital converters
Oversampling and noise-shaping techniques, such as [delta sigma] modulation, are widely used in analog-to-digital conversion to achieve accuracy that exceeds that of integrated-circuit components. Such converters have an inherent tradeoff between accuracy and speed, whereby resolution in amplitude …
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Decimator implementation for a pipelined oversampling analog-to-digital converter
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Low power, low area, monolithic oversampling digital to analog conversion
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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SYNTHETIC OVERSAMPLING IMPROVES SPECTRAL DETECTION OF AFLATOXIN IN SINGLE MAIZE KERNELS
… spectral dataset: humid incubation and synthetic oversampling. The addition of synthetic training samples improved prediction accuracy of kernels containing ≥150 ppb AF from 51% to 80%. Humid incubation contributed additional kernels with intermediate levels of AF contamination (primarily 5 - 75 …
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Enhancing Telecom Churn Prediction: Adaboost with Oversampling and Recursive Feature Elimination Approach
… set of experiments. The second set involves oversampling the training set to address the issue of imbalanced data. Lastly, the third set combines oversampling with recursive feature selection to enhance the model's performance further.</p> <p>The results demonstrate that the Adaptive Boost …
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Improved adaptive semi-unsupervised weighted oversampling (IA-SUWO) using sparsity factor for imbalanced datasets
… in machine learning. For preprocessing, oversampling techniques significantly benefitted the imbalanced domain, in which artificial data is generated in minority class to enhance the number of samples and balance the distribution of samples in both classes. However, existing oversampling …
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Design and Realization of a Single Stage Sigma-Delta ADC With Low Oversampling Ratio
… sigma-delta A/D converter with very low oversampling ratio for the wireless application. An architecture for a multibit single-stage delta-sigma A/D converter with two-step quantization is proposed. Both the MSB and LSB signals produced by the two-step quantization are fed back …
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On Reputation and Data-centric Misbehavior Detection Mechanisms for VANET
… the problem of information cascading and oversampling, which commonly arise in social networks. Oversampling is a situation in which a node observing two or more nodes, takes into consideration both their opinions equally without knowing that they might have influenced each other in …
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Evaluation of Artifacts In Experimental Cine 4D Ct Acquisition Methods
… investigational 4D CT acquisition methods: (1) oversampling the data acquired, (2) gating the x-ray beam with breathing irregularities, and (3) rescanning areas of the clinical standard 4D CT associated with high breathing irregularities. These experimental acquisitions were tested through a …
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Circuit level synthesis for delta-sigma converters
… and implemented a discrete-time, one-bit, oversampling delta-sigma analog-to-digital modulator circuit synthesis tool in MATLAB script. With the parameters of center frequency, loop order, oversampling ratio, and minimum capacitor size, a user can utilize the program to generate a …
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Reducing Multiple Access Interference in Broadband Multi-User Wireless Networks
… A fractionally spaced receiver is obtained by oversampling received signals in a time domain. Second, a novel circular-shift division multiple access (CSDMA) scheme for multi-carrier multi-user wireless systems is developed. In CSDMA, each symbol is first spread onto multiple orthogonal …
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Performance evaluation of text augmentation methods with BERT on imbalanced datasets
… data, including boosting, SMOTE, and simple oversampling, combined with widely used machine learning models, including logistic regression, fully connected neural network, and LSTM. Experimental results show that Word2Vec augmentation improves the performance of BERT in detecting the minority …
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A fourth order [Sigma] [Delta] bandpass modulator
… modulation offers the advantage of a high oversampling rate without the need to demodulate the signal for lowpass [Sigma] [Delta] modulation.
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Oversampled pipline A/D converters with mismatch shaping
… 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 subsequent digital filters, significantly improving the linearity. Mismatch shaping …
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Building blocks of a 250MHz bandwidth, 10-bit continuous-time delta-sigma analog to digital converter
… is selected to be second-order, 3-bit with a 32 oversampling rate based on the ideal model simulation in MATLAB. The transistor-level circuits are designed in a BiCMOS technology. The SQNR result is 63.3dB and the power is 140mW.
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Analytical and numerical techniques for wave scattering
… we explore the extent to which least-squares oversampling can improve collocation. We provide rigorous analysis that proves guaranteed convergence for small amounts of oversampling and shows that superlinear oversampling can ensure faster asymptotic convergence rates of the method. Secondly, …
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A Frequency Domain Beamforming Method to Locate Moving Sound Sources
… time domain de-Dopplerization techniques require oversampling and interpolation of the microphone time data. In contrast, the technique presented in this dissertation performs the de-Dopplerization entirely in the frequency domain eliminating the need for oversampling and interpolation of the …
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