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 32 for “"quantizers"”.
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Structured vector quantizers in image coding
… considerable attention. Unstructured vector quantizers, i.e., those with no restriction on the geometrical structure of the codebook, suffer from two basic drawbacks, viz., the codebook search complexity and the large storage requirement. This explains the interest in the structured VQ …
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Sparse representation for audio noise removal using zero-zone quantizers
… leads to noise removal. In this thesis, such quantizers are applied over Discrete Fourier Transform and Karhunen Loeve Transform coefficients separately, and outputs compared. Further, the localization of the zero zones to certain frequencies leads to better performance in terms of noise …
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Causal and statistical analyses of dithered systems containing three-level quantizers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1959.
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Dynamic Element Matching Techniques For Delta-Sigma ADCs With Large Internal Quantizers
<p>This thesis presents two methods that enable high internal quantizer resolution in delta-sigma analog-to-digital converters. Increasing the quantizer resolution in a delta-sigma modulator can increase SNR, improve stability and reduce integrator power consumption. However, each added bit of …
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Functional quantization-based stratified sampling
… requires the ability to both create functional quantizers and to sample Brownian paths from the strata defined by the quantizers. We show that product quantizers are a suitable approximation of an optimal quantizer for the formation of functional quantizers. The notion of functional …
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Quantization of prior probabilities in Bayesian group decision-making
… are identical and whether referees use identical quantizers create variants of the problem. When referees are identical in both their cost functions and their quantizers for the prior probabilities, it is optimal for the referees to use the same decision rules. The homogeneity of the referees …
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Quantization for Noisy Channels Using Structured Codes
… for the optimality of binary lattice vector quantizers with respect to the mean squared error distortion criterion are derived for both noiseless and noisy discrete memoryless channels.
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Timing offset and quantization error trade-off in interleaved multi-channel measurements
… between the additive noise model and uniform quantizers. A simulation is implemented for the multi-channel measurement and reconstruction system. The simulation reveals a key inconsistency in the environment of time-interleaved ADCs: cross-channel quantization error correlation. Statistical …
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Generalizations of permutation source codes
… source codes are a class of structured vector quantizers with a computationally- simple encoding procedure. In this thesis, we provide two extensions that preserve the computational simplicity but yield improved operational rate-distortion performance. In the first approach, the new class of …
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Source and Channel Coding of Images for Noisy Channels
… Extensions of multiple description scalar quantizers in combination with erasure correcting codes are proposed as another method.
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Quantization Points of Densities and Samples
… discuss asymptotically optimal quanizers. These quantizers are easier to find than optimal quantizers and perform well for moderate to large values of k. Representative points can be estimated for sample data. We discuss both parametric and non-parametric cases. Quantizer mismatch occurs when a …
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Design and analysis of spherical codes
… is better than previously published results of quantizers with equivalent complexities."
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Quantization Methods for Matrix Multiplication and Efficient Transformers
… with deployable systems: structured vector quantizers accelerate LLM inference and enable competitive discrete representations for RF tasks.
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Quantized Consensus by the Alternating Direction Method of Multipliers: Algorithms and Applications
… including the above two, adopt infinite-bit quantizers unless a bound on agents' data is known a priori, we further develop an ADMM based quantized consensus algorithm using finite-bit bounded quantizers for possibly unbounded agents' data. By picking a small enough ADMM step size, this …
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Channel state quantization in MIMO broadcast systems : architectures and codes
… extra degrees of freedom to design structured quantizers that aid in user selection and allow the system to adapt to heterogeneous user populations with different fading characteristics. We construct an adaptive quantization framework which, when paired with low-complexity graph algorithms, …
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Dynamic information and constraints in source and channel coding
… side information, we also construct practical quantizers based on lattices and codes on graphs. Our use of codes on graphs is also of independent interest since it highlights some issues in translating the success of turbo and LDPC codes into the realm of source coding. Finally, to explore the …
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Optimized Image Compressed Sensing And Transmission Through Wireless Channels
… error. This procedure is carried out using three quantizers (i.e Uniform scalar quantizer, Cumulative Distribution function based quantizer, and Lloyd-maxx quantizer). Simulations are formed that confirms our claim of deteriorating performance after considering channel effect, and significant …
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Successive-approximation-register based quantizer design for high-speed delta-sigma modulators
… successive-approximation-register (SAR) quantizers. Design techniques for high-speed medium-resolution SAR analog-to-digital converters (ADCs) using synchronous SAR logic are proposed. Four-bit and 8-bit 5 GS/s SAR ADCs have been implemented in 65 nm CMOS using 8-channel and 16-channel …
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Compressive sensor networks : fundamental limits and algorithms
… a fixed quantizer, the optimal design of such quantizers is still unknown. We propose to find the optimal quantizer in terms of minimizing quantization error by using recent results in functional scalar quantization. The best quantizer in this case is not the optimal design for the measurements …
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Optimal nonlinear digital signal processing : a dynamical systems approach
… pulse-width modulators (DPWM) used as quantizers for power amplifiers in switched-mode operation. A time-domain input-output model of DPWM which offers new insight into nonlinear behavior of this system is developed. A modified Lloyd-Max quantization based algorithm for linearization of …
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