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 39 for “"Multi-rate"”.
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Multi-rate time integration on overset meshes
… of problems with complex geometries or multiscale spatio-temporal features, overset meshes can be effectively used. However, in the case of overset problems in which one or more of the meshes vary significantly in resolution, standard explicit time integrators limit the maximum allowable …
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Multi-user detection for multi-rate DS/CDMA systems
… services motivate the need for handling multi-media traffic types. In a multimedia communication system, users with different and even time-varying rates and quality of services (QoS) requirements, such as voice, image and data, must be accommodated. The use of Spread Spectrum modulation …
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Multi-rate Sensor Fusion for GPS Navigation Using Kalman Filtering
With the advent of the Global Position System (GPS), we now have the ability to determine absolute position anywhere on the globe. Although GPS systems work well in open environments with no overhead obstructions, they are subject to large unavoidable errors when the reception from some of the …
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Blind Channel Estimation and Multiuser Detection for Multi-Rate CDMA Communications
… QoS may require the support of variable bit rates on the wireless links to the individual users. Multi-rate DS/CDMA is a promising basis on which to support the variable bit rates on the individual wireless links. Currently, the study on channel estimation and multiuser detection for …
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Novel multiuser detection and multi-rate schemes for multi-carrier CDMA
… for wireless systems, in particular, high data rate services, such as wireless Internet access. Users with different data rates and quality of service (QoS) requirements must be accommodated. A suitable multiple access scheme is key to enabling wireless systems to support both the high data rate …
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Power allocation of multi-rate transmissions over a jammed broadcast channel
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Improving aggregate user utilities and providing fairness in multi-rate wireless LANs
… nodes transmit at different data transmission rates. We demonstrate the advantages of time-based fairness, in which each competing node receives an equal share of the wireless channel occupancy time. Through analysis, experiments on a Linux test bed, and simulation, we demonstrate that …
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Multi-rate access schemes and successive interference cancellation for wireless multimedia MC-CDMA communications
… changes of the information challenges, providing multimedia services has become a very important requirement for future wireless communications. A proper system, capable of supporting multi-rate transmissions as well as handling high quality of service (QoS) requirements in hostile wireless …
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Movable frame hybrid MAC : a multi-MAC protocol for wireless software radios in multi-rate multimedia applications
… adjustment of the bandwidth requirement of multimedia applications. The purpose of this technique is handling multi-rate, multi-level traffic in an integrated wireless-access network (IWAN). A proposed mechanism divide total bandwidth in basic band and reservation band. Four conventional …
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Estimation and Control of Autonomous Vehicles Over Networks
… testbed it is applicable to all continuous multi-rate linear time varying systems.
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Design and performance evaluation of multicast congestion control for the internet
Multi-rate Multicast Congestion Control (MR-MCC) is a promising opportunity to tackle the multicast congestion control problem in huge and heterogeneous networks like the global Internet. However, it is not easy to provide an MR-MCC design with responsiveness, efficiency of network utilisation, low …
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Physically-asynchronous logically-synchronous (PALS) system design and development
… distributed applications as if they would operate on a globally synchronous architecture with a single global clock. The pattern maps the globally synchronous design as a logically synchronous design executing on the physically asynchronous architecture. It provides significant benefit in …
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Techniques in Kalman Filtering for Autonomous Vehicle Navigation
… framework of Kalman filtering (KF). To demonstrate the flexibility of the KF several methods are explored and implemented such as constraints, multi-rate data, and cascading filters to augment the measurement matrix of a main filter. GPS and IMU navigation are discussed, along with common …
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Multicodes for improved range resolution in radar
… each of which requires different transmission rates. Multi-code modulation has been introduced therefore as a means of supporting multi-rate services and operating in multi-cell environments [8, 9, 10]. This multi-rate multi-function capability may be used in Radar related applications, too. …
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Design and implementation of a reconfigurable data acquisition integrated circuit
… processor has developed rapidly due to integrated circuit (IC) technology over the past 20 years, engineers have turned to digital signal processing as a more advanced and convenient method [1]. Data acquisition (DAQ) systems are, therefore, inevitably necessary, as they are the interface …
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Development and Analysis of Adaptive Interference Rejection Techniques for Direct Sequence Code Division Multiple Access Systems
… inadequacy of conventional CDMA receivers in a multiple access interference-limited mobile radio environment has spurred research on advanced receiver technologies. This research investigates the use of adaptive receivers for single user demodulation to overcome some of the deficiencies of a …
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Long-term desorption behavior of uranium and neptunium in heterogeneous volcanic tuff materials
… objectives of the experiments were to 1. Demonstrate a methodology aimed at characterizing <italic>distributions<italic> of sorption parameters (attributes of multiple sorption sites) that can be applied to moderately-sorbing species in heterogeneous systems to provide more realistic reactive …
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Formal Techniques for Design and Development of Safety Critical Embedded Systems from Polychronous Models
… one such formal modeling language - MRICDF (Multi-Rate Instantaneous Channel-connected Data Flow). MRICDF is a graphical, declarative, polychronous modeling language, with a formalism that allows the modeler to easily describe multi-clocked systems without the necessity of global clock. …
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Compact Digital Predistortion for Multi-band and Wide-band RF Transmitters
… the number of training samples and the sampling-rate of feedback ADCs in DPD systems. A new theory about the information carried by training samples is introduced. It connects the generalized error of the DPD estimation algorithm with the statistical properties of modulated signals. Secondly, …
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