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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Low complexity and high performance coded modulation systems

Rajpal, Sandeep January 1994 (has links)
Thesis (Ph.D.)--University of Hawaii at Manoa, 1994. / Includes bibliographical references (leaves 212-216). / Microfiche. / xiii, 216 leaves, bound ill. 29 cm
12

Coded modulations for mobile satellite communication channels

Rhee, DoJun January 1995 (has links)
Thesis (Ph. D.)--University of Hawaii at Manoa, 1995. / Includes bibliographical references (leaves 292-303). / Microfiche. / xxxii, 303 leaves, bound ill. 29 cm
13

Multihop wireless communications channels /

Boyer, John, January 1900 (has links)
Thesis (M. App. Sc.)--Carleton University, 2001. / Includes bibliographical references (p. 92-95). Also available in electronic format on the Internet.
14

Wideband digital predistortion linearization of radio frequency power amplifiers with memory /

Franco, Marcelo Jorge. Herczfeld, Peter R. January 2005 (has links)
Thesis (Ph. D.)--Drexel University, 2005. / Includes abstract and vita. Includes bibliographical references (leaves 173-178).
15

Bit-interleaved coded modulation with iterative decoding for wireless communications /

Huang, Yuheng. January 2004 (has links)
Thesis (Ph. D.)--University of Washington, 2004. / Vita. Includes bibliographical references (p. 98-104).
16

Incorporation of digital angle-modulation into a fractional division synthesizer.

Dong, Adam Xuesi, Carleton University. Dissertation. Engineering, Electrical. January 1992 (has links)
Thesis (M. Eng.)--Carleton University, 1992. / Also available in electronic format on the Internet.
17

Evaluation of improved designs for two-dimensional bit-interleaved coded modulation with iterative decoding in fading channels /

Chindapol, Aik. January 2000 (has links)
Thesis (Ph. D.)--University of Washington, 2000. / Vita. Includes bibliographical references (p. 110-119).
18

Modelagem digital de atributos de solo da Fazenda Edgárdia - Botucatu-SP /

Carvalho, Tania Maria de. 1965 January 2016 (has links)
Orientador: Célia Regina Lopes Zimback / Banca: Paulo Milton Barbosa Landim / Banca: Alessandra Fagioli da Silva / Banca: Bruna Soares Xavier de Barros / Banca: Diego Augusto de Campos Moraes / Resumo: O mapa de solos é uma ferramenta essencial para o planejamento de uso da terra e estudos que envolvem aspectos ambientais relativos a esse importante recurso natural. Técnicas quantitativas e ferramentas de geoprocessamento têm sido aliadas à interpretação dos processos pedogenéticos para possibilitar a elaboração de mapas mais precisos, obtidos por processo mais rápido e menos oneroso. Dentre os modelos aplicados, os denominados modelos híbridos empregam variáveis auxiliares preditoras e autocorrelação espacial, para viabilizar a predição de atributos de solo em locais não amostrados. A iniciativa para mapeamento digital do solo em escala mundial - GlobalSoilMap.net atua no sentido de disponibilizar representações globais de atributos de solo, elaboradas por meio da aplicação de modelo híbrido em dados legados de solos, realizando a prática do Mapeamento Digital de Solos (MDS). Com base nesse princípio, esse trabalho baseou-se na hipótese de que a aplicação da técnica híbrida regressão-krigagem, utilizando dados legados de levantamento de solo e covariáveis de relevo e sensoriamento remoto proveem mapa de atributos de solo representativos de uma área da Cuesta de Botucatu. O modelo foi aplicado localmente, a duas profundidades, para representação contínua do Índice de Avermelhamento (IAV), saturação de bases (V%), teor de areia, teor de argila, CTC e pH dos solos da Fazenda Experimental Edgárdia, para a qual são disponíveis dados de levantamento de solo. As covariáveis ... / Abstract: The soil map is an essential tool for land use planning and studies related to environmental aspects of this important natural resource. Quantitative techniques and geoprocessing tools are currently combined with the interpretation of pedogenic processes to enable the development of more accurate maps obtained by faster and less costly process. Among the models applied to it, the hybrid models employ predictive auxiliary variables and spatial autocorrelation, to enable the prediction of soil attributes in unsampled locations. The digital soil mapping worldwide project - GlobalSoilMap.net acts in order to provide global representations of soil attributes developed through the application of hybrid model in legacy soil data, performing the practice of Digital Soil Mapping (MDS). This work was based on the assumption that the application of the hybrid technique of regression-kriging (RK), using legacy data of soil survey and covariates of relief and remote sensing provide representative map of soil attributes of an area in Cuesta of Botucatu. The goal was to apply locally, in two depths, prediction models and continuous representation of Soil Redness Index (IAV), base saturation index (V%), sand content and clay content, cation-exchange capacity (CTC) and pH of the soils in Edgardia Experimental Farm, for which are available soil survey data. The predictor covariates were derived from an Digital Elevation Model (MDE) and an orbital image. They were all standardized at spatial resolution of 10 m, the methods were selected by checking significant linear correlation between attributes and covariates and spatial autocorrelation of attributes or residues of multiple linear regressions (RLM). The data were separated into training and validation subsets. The correlation coefficients (r) between soil attributes and covariates were significant and ranged from -0.40 to 0.51. The predictors more ... / Doutor
19

Digital FDM for the HSTSS DAC Program

Doerr, Michael B., Hallidy, William H., Jr.,, McMillian, Gary B., Burke, Lawrence W., Jr., Faust, Jonah N. 10 1900 (has links)
International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada / This paper presents the design of an innovative approach to Frequency Division Multiplexing (FDM) for the STRICOM Hardened Subminiature Telemetry and Sensor System (HSTSS) Data Acquisition Chipset (DAC) program. An ASIC (Application Specific Integrated Circuit) is being developed by Systems & Processes Engineering Corporation (SPEC) that implements this new digital FDM approach for telemetry applications. The FDM ASIC provides six channels that are IRIG-106 compatible, and may be used in conjunction with a Delay/Repeater ASIC. Together these ASICs make a complete instrumentation system for those applications requiring very small size, simplicity of use, and low cost, e.g. munitions/armament testing.
20

THE SYSTEM DESIGN OF DIGITAL TWELVE-CHANNEL GPS SIMULATOR

Juan, Lu, Qing, Chang, Qishan, Zhang 10 1900 (has links)
International Telemetering Conference Proceedings / October 21, 2002 / Town & Country Hotel and Conference Center, San Diego, California / With the purpose of testing the performance of GPS receivers, a GPS signal simulator is needed that can emulate the real GPS signals under all kinds of the conditions. This paper analyzes the single channel and multi-channel GPS signals’ characters in time domain and frequency domain, and discusses a mathematic model of the twelve-channel GPS simulator. In order to reduce the difficulties of the hardware design, this model is designed to provide the IF signal directly by applying the idea of “software radio”and the theory of interpolation. Simulation results with SystemView software demonstrate the feasibility of the system scheme. A practical hardware design of this system is described.

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