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 38 for “"Adaptive array"”.
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A New Adaptive Array of Vibration Sensors
… control of structural vibration. The sensor array is constructed from strain-sensing segments. The segment outputs are transformed into modal coordinates by a sensor gain matrix. An adaptive algorithm for computing the sensor gain matrix with minimal knowledge of the structure's modal …
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Adaptive array processing for multiple microphone hearing aids
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.
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Simulation of Adaptive Array Algorithms for CDMA Systems
… to improve spectrum utilization. The CDMA and adaptive antenna array are two approaches that shows real promise for increasing spectrum efficiency. In this research, we investigate the performance of different blind adaptive array algorithms in the CDMA systems. Two novel algorithms, …
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Adaptive array signal processing and performance analysis in non-Gaussian environments
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Physically constrained maximum likelihood method for snapshot deficient adaptive array processing
Thesis (Elec.E. and S.M. in Electrical Engineering)--Joint Program in Applied Ocean Physics and Engineering (Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; and the Woods Hole Oceanographic Institution), 2003.
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Novel Adaptive Array Algorithms and Their Impact on Cellular System Capacity
This report focuses on the application of adaptive arrays to the Advanced Mobile Phone Service (AMPS) and Code Division Multiple Access (CDMA) cellular systems. Adaptive arrays have been proposed as early as in the 1960s to improve the signal quality, but most of its applications were restricted to …
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Simulation of Adaptive Array Algorithms for OFDM and Adaptive Vector OFDM Systems
… intersymbol interference (ISI). Deploying an adaptive antenna array at the receiver can help separate the desired signal from interfering signals which originate from different spatial locations. This enhancement of signal integrity increases system capacity. In this research, we apply …
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Robust Steering Vector Mismatch Techniques for Reduced Rank Adaptive Array Signal Processing
… is on the development of advanced reduced rank adaptive signal processing for airborne radar space-time adaptive processing (STAP) and steering vector mismatch robustness. This is an important area of research in the field of airborne radar signal processing since practical STAP algorithms …
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A study of space-time adaptive array processing for cancellation of GPS jamming
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Antenna element pattern reconfigurability in adaptive arrays
… radiation reconfigurable antennas in an adaptive array setting. The work centers on arrays composed of a small number of widely spaced elements. Such array configurations (1) mitigate the effects of mutual coupling between reconfigurable elements, thereby maximizing their individual …
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Interference Mitigation by Reconfigurable Adaptive Antenna Array
Antenna arrays play an important role in diverse application areas, such as target detection and direction of arrival (DOA) estimation to list a few. Traditional receiver structures with a fixed array configuration are either inefficient due to array redundancies or may incur significant …
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Blind adaptive antenna arrays for mobile communications
Adaptive antenna arrays have tremendous potential for increasing the capacity of mobile communications, by reducing co-channel interference, multipath, and noise. Blind adaptive algorithms, that is, algorithms which do not require a training sequence, are investigated and compared in this study. …
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Acoustic vector-sensor array processing
… techniques for acoustic pressure-sensor arrays. Acoustic vector-sensor arrays, which measure particle velocity and pressure, offer significant potential but require fundamental changes to algorithms and performance assessment. This thesis develops new analysis and processing techniques …
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Accelerated gradient techniques and adaptive signal processing
… gradient techniques to various fields of adaptive signal processing. A variety of adaptive algorithms based on the accelerated gradient techniques are developed and analysed in terms of the convergence speed, computational complexity and numerical stability. Extensive simulation results …
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Adaptive Antenna Arrays for Satellite Personal Communication Systems
… overall capacity. To overcome this problem, adaptive antenna arrays on handheld terminals are proposed. This technique is believed to be better than omni-directional antennas which radiate in all directions. Adaptive antenna arrays have the ability to adapt to the changing environment and …
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Randomly Spaced Smart Antennas
The goal of this thesis is to develop adaptive array' features out of randomly spaced antenna elements. Most optimization techniques that have been presented so far for non-equidistant antenna arrays have been restricted to the analysis of symmetric or linear geometries. Several direction of …
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FAST ALGORITHMS FOR SEPARATING AND TRACKING SOURCES IN ADAPTIVE ARRAYS
The use of adaptive array processing techniques to enhance desired directional signals and reject or detect unknown interferences is well known. However, many conventional algorithms still suffer from various limitations in enhancing directional signals and will not function properly in situations …
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The Bi-directional Spatial Spectrum for MIMO Radar and Its Applications
… have long applied electronically-steered phased arrays to discriminate returns in azimuth angle and elevation angle. On receiver arrays, beamforming is performed after reception of the data, allowing for many adaptive array processing algorithms to be employed. However, on transmitter arrays, up …
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