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.
Results
Showing 1 to 20 of 168 for “"Communications systems"”.
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Power line communications systems
The purpose of this project is to determine the performance of a Power line communication connection by measuring its propagation characteristics. For power line communication to become efficient, a model of their behaviour at frequencies from 0 to 30 MHz is required. The attenuation and phase …
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Power control for spread spectrum communications systems
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Wavelet based design of digital multichannel communications systems
The huge penetration of the personal communications systems in the market is constantly presenting new challenges to the research, aimed at satisfying people's needs and requirements for effective communication systems. At present, the cellular telephone network is perhaps the most evident example …
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Novel narrowband microstrip filters for wireless communications systems
… in next generation wireless communication systems. Several novel microstrip bandpass filter structures have been introduced that meet the stringent requirements for high-performance (shaip-cutoff frequency response, low insertion-loss, high return-loss, and high out-of-band isolation), …
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Dynamic resource allocation in CDMA cellular communications systems
… is the primary problem in cellular communication systems. In this thesis, we combine the main resource issues for CDMA systems, admission control and power control, in a single framework. The framework uses a formulation that is general enough to incorporate all significant parameters of a system, …
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Design and performance analysis of energy harvesting communications systems
… is an urgent need to design future wireless systems that aim to improve energy efficiency (EE) and spectral efficiency (SE). One of the possible solutions is to use energy harvesting (EH), which promises to reduce energy consumption issues in information and communication technology sector. …
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Optimal Communications Systems and Network Design for Cargo Monitoring
… This dissertation demonstrates that sensors and communications systems can be used to monitor cargo in motion. In addition the dissertation provides potential designers of cargo monitoring systems tools which can be used to study the trade-offs inherent in such a system. Finally, the dissertation …
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Adaptive band-partitioning of rinterference cancellation in communications systems
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Performance of dual polarized site diversity satellite communications systems
… used in high frequency satellite communication systems to reduce the effects of attenuation and depolarization due to rain and ice. This thesis examines dual polarized site diversity satellite communication systems to determine how such systems would perform under operating conditions. Three …
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Adaptive polarization mode dispersion equalizers for coherent optical communications systems
… leading to performance reduction of the coherent systems. In order to compensate for the PMD, we use adaptive linear PMD equalizers. Due to the dynamic and random nature of PMD, it is crucial for a system designer to efficiently simulate the PMD-induced outage probabilities of 10-5. Because of …
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An Optimization of Thermodynamic Efficiency vs. Capacity for Communications Systems
… mechanisms which affect the power efficiency of communications processes along with a method for efficiency enhancement. Shannon's work is the definitive source for analyzing information capacity of a communications system but his formulation does not predict an efficiency relationship suitable …
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On the Capacity Modelling in 3G Mobile Wireless Communications Systems
… of the present 3G mobile communication systems such as the wideband CDMA (WCDMA). However, the rapid increase in the number of connections and demand for high-speed multimedia communication services supported is contradicting with the limited resources allocated by these systems. WCDMA …
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Reliable and secure information and communications systems for electrical utilities
Commercial Off-The-Shelf (COTS) systems have become pervasive. The underlying technologies of these systems were developed before security was a priority. Using conventional approaches, it is not possible to mitigate these systems adequately for use in Critical Infrastructure (CI). <br/><br/>Some …
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Capacity, coding and interference cancellation in multiuser multicarrier wireless communications systems
Multicarrier modulation and multiuser systems have generated a great deal of research during the last decade. Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation generated with the inverse Discrete Fourier Transform, which has been adopted for standards in wireless and …
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Machine Learning-Based Receiver in Multiple Input Multiple Output Communications Systems
… to multiple-input-multiple-output (MIMO) communications systems is a primary driving force for next-generation wireless systems. This dissertation introduces a variety of neural network structures for symbol detection/equalization tasks in MIMO systems configured with two different …
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Analysis and experimental characterization of nonlinear circuits applied to wireless communications systems
La Tesis realizada pretende dar una visión amplia y detallada sobre el análisis de circuitos no lineales para comunicaciones inalámbricas. Partiendo de una revisión del estado del arte de los métodos de análisis no lineal, los enfoques estudiados incluyen la aplicación del algoritmo de Newton …
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Performance evaluation of multimedia satellite communications systems using on-board packet switches
Satellite communications systems are ideally equipped to provide future multimedia services on a global level and at a distance-independent cost. In order to meet the ever-growing bandwidth demands of these new applications, satellites employing multiple spot beam antennas are required. An on-board …
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Messiahs and Monopolists: A Cultural History of Canadian Communications Systems, 1846-1914
Made available in DSpace on 2015-05-13T15:18:50Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7820933.PDF: 17364260 bytes, checksum: 61ea68166b05996acbb67111c67b96f5 (MD5) Previous issue date: 1978
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Application of sun-synchronous, critically inclined orbits to global personal communications systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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