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 55 for “"Quantizer"”.
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Compression of underwater video sequences with quantizer/position-dependent encoding
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Successive-approximation-register based quantizer design for high-speed delta-sigma modulators
… For this reason, it is essential that the quantizer used in the delta-sigma loop operate at a high sampling frequency. This thesis focuses on the design of high-speed time-interleaved multi-bit successive-approximation-register (SAR) quantizers. Design techniques for high-speed …
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A binary quantizer with a resolution of one part in a thousand
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Electrical Engineering, 1951.
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A 4th order continuous-time [Delta] [Epsilon] ADC with VCO-based integrator and quantizer
The use of a VCO-based integrator and quantizer within a continuous-time (CT) [Delta] [Epsilon] analog-to-digital converter (ADC) structure is explored, and a custom prototype in a 0.13 [mu]m CMOS with a measured performance of 81.2/78.1 dB SNR/SNDR over a 20 MHz bandwidth while consuming 87 mW …
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Optimized Image Compressed Sensing And Transmission Through Wireless Channels
… white gaussian noise wireless channel model, the quantizer and bit energy signal-to-noise ratio determines the degree of the channel effect. This thesis explores the effect of quantization and channel noise during the transmission of quantized compressed sensing image over additive white gaussian …
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A predictive adaptive delta modulator
… the adaptive delta modulator, a bi-state quantizer and tri-state quantizer are presented for comparison. Since the grannular region difficulties can be eliminated by the tri-state quantizer, the tri-state quantizer ADM provides a better stability. The present design also consists of a …
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Dynamic Element Matching Techniques For Delta-Sigma ADCs With Large Internal Quantizers
… 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 quantizer …
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Compressive sensor networks : fundamental limits and algorithms
… that mitigate quantization noise for 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 …
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Design and analysis of spherical codes
… can be efficiently used as part of a vector quantizer for a memoryless Gaussian source. Both constructions are structured so that codepoints may be identified without having to store the entire codebook. For several different rates, the distortion performance of the proposed quantizer is …
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An implementation of an AMPS digital base station with adaptive Automatic Gain Control
… high-resolution, wideband, uniform and symmetric quantizer, optimal gain factors are computed for uniformly-, sinusoidally- and normally-distributed input signals. These gain factors maximize the quantizer's Signal-to-Quantization Noise Ratio (SQNR) in a mean-square sense. Together, these …
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An optical-electrical sub-sampling down-conversion receiver with continuous-time [Sigma] [Delta] modulation
… are leveraged to perform signal clocking and quantizer pre-amplification, overcoming digital-to-analog converter (DAC) clock jitter and quantizer metastability issues that plague traditional electronic implementations. The optical-electrical converter achieves 76.5 dB of SNR (12.4 ENOB) with a …
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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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Quantization of color images using the modified median cut algorithm
… algorithm yield dramatic improvements in quantizer performance. The color quantization problem is considered in two parts: the selection of the optimal color palette, and the optimal mapping of each image pixel to a color from the palette. The method to be described is an image dependent …
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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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Systematic hybrid analog/digital signal coding
… algorithms for the design of locally optimal quantizers. For the Gaussian case, we describe a low-complexity scalar quantizer, the nested lattice scalar quantizer, that has performance very near that of the optimal systematic scalar quantizer. Analogous to entropy coding for conventional …
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Functional quantization
… quantization, we obtain asymptotically optimal quantizer point densities and bit allocations. Introducing the notions of functional typicality and functional entropy, we then obtain asymptotically optimal block quantization schemes for each component. Next, we address the issue of non-monotonic …
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Analysis and Dynamic Range Enhancement of the Analog-to-Digital Interface in Multimode Radio Receivers
… technique in conjunction with an asymmetrical quantizer is presented and compared with standard dither techniques. Advantages of this technique compared to ordinary ADC's include an almost one bit improvement in resolution, quantization noise whitening, elimination of A/D offsets, and the …
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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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Phase noise and spur reduction in an array of direct digital synthesizers
… truncation spurs, quantization noise spurs, and quantizer nonlinearity spurs. Measurements to determine the level of correlation among DDS channels were made on a custom 14-channel DDS testbed. The investigation of the phase noise of a DDS array indicates that the contribution to the phase noise …
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