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 10 of 10 for “"adaptive arrays"”.
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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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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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Adaptive Arrays and Diversity Antenna Configurations for Handheld Wireless Communication Terminals
… of an investigation into the performance of adaptive beamforming and diversity combining using antenna arrays that can be mounted on handheld radios. Handheld arrays show great promise for improving the coverage, capacity, and power efficiency of wireless communication systems. Diversity …
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Investigation of mutual coupling effects on pattern null reconfigurable antennas in small adaptive arrays
Adaptive arrays composed of fixed pattern elements have been studied extensively in the past. In these arrays, adaptive processing algorithms have control over the magnitude and phase applied to each array element to modify the array pattern. Recently, pattern reconfigurable elements have been …
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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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Design And Analysis Of Adaptive And Reconfigurable Antennas For Wireless Communication
… the use of reconfigurable antenna elements in adaptive arrays. An adaptive array that can null interference and direct its main lobe to the desired signal while being reconfigurable to maintain functionality at several frequency bands has the potential to revolutionize wireless communications …
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Null Depth Trade Off for Output Power Reduction in a Downlink Adaptive Antenna Array
… are known to the basestation. However, downlink adaptive arrays use additional power when they are required to include null steering in their beam patterns. This excessive transmitted power reduces the effective antenna gain, increases interference in other directions and has implications on the …
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Techniques and adaptation algorithms for direct-sequence spread-spectrum CDMA single-user detection
… are explained with a common approach using an adaptive antenna array perspective and noting that single-user detectors exploit spectral redundancy, while adaptive arrays exploit spatial redundancy. Commonly used trained adaptation algorithms for single-user detection are first presented, and …
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Adaptive Equalization for Indoor Channels
This thesis describes the use of adaptive equalization techniques to compensate for the intersymbol interference (ISI) that results when digital data is transmitted over a multipath radio channel. The equalization structures covered in this work are the linear transversal equalizer (LTE), the …
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Direction of arrival estimation using antenna arrays
The objective of this thesis is to design, build and evaluate a direction-of-arrival measurement system using an antenna array operating at 2050 MHz. The first phase of the project is an extensive study of various high resolution DOA estimation algorithms. The algorithms studied include …