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 19 of 19 for “"Array signal processing"”.
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Array signal processing for source localization and enhancement
<p>“A common approach to the wide-band microphone array problem is to assume a certain array geometry and then design optimal weights (often in subbands) to meet a set of desired criteria. In addition to weights, we consider the geometry of the microphone arrangement to be part of the optimization …
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Array Signal Processing Algorithms for Beamforming and Direction Finding
Array processing is an area of study devoted to processing the signals received from an antenna array and extracting information of interest. It has played an important role in widespread applications like radar, sonar, and wireless communications. Numerous adaptive array processing algorithms have …
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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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Array Signal Processing for Communications from High Altitude Platforms and Other Applications
… beamforming (DBF) technology using antenna array has reached a sufficient level of maturity that it can be applied to communications to improve system capacity. In this thesis, the applications to digital beamforming in the communications from high altitude platforms (HAPs) and the high data …
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Robust Steering Vector Mismatch Techniques for Reduced Rank Adaptive Array Signal Processing
… 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 should be …
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Design and Implementation of System Components for Radio Frequency Based Asset Tracking Devices to Enhance Location Based Services. Study of angle of arrival techniques, effects of mutual coupling, design of an angle of arrival algorithm, design of a novel miniature reconfigurable antenna optimised for wireless communication systems
… sources plays a vital role in the field of array signal processing as MIMO systems can be employed at both the transmitter and the receiver end and the system capacity, reliability and throughput can be significantly increased by using array signal processing. Almost all applications require …
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The Steered Auxiliary Beam Canceller for Interference Cancellation in a Phased Array
A common problem encountered in phased array signal processing is how to remove sources of interference from a desired signal. Two existing methods to accomplish this are the Linearly Constrained Minimum Variance (LCMV) beamformer and the Side-Lobe Canceller (SLC). LCMV provides better performance …
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Compressive sensing based non-destructive testing using ultrasonic arrays.
… sensing approach and the notion of sparse signal recovery to the non-destructive testing application, using ultrasonic arrays. In many signal processing applications including array signal processing, there is a remarkable effort to use the concept of sparsity to solve an under-determined …
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Generating pictures from waves : aspects of image formation
… approximations from optics. On the other hand, array signal processing and acoustics researchers analyze coherent sound waves using stochastic estimation theory and diffraction formulas from physics. The ability to inexpensively fabricate analog circuitry and digital logic for millimeter-wave …
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Adaptive antenna systems for mobile broadband communications
… transceivers, along with the associated advanced array signal processing, to improve cell coverage, link quality and system capacity. This dissertation first provides a framework of adaptive antenna systems for wireless communications, and characterizes the multipath fading channels of mobile …
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Sparse spectrum fitting in array processing
… (DOA) estimation using sensor arrays. By developing the sparse representation models for the spatial covariance matrix of correlated or uncorrelated sources respectively, the DOA estimation problem is reformulated under the framework of Sparse Signal Reconstruction (SSR). The …
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Overloaded Array Processing: System Analysis, Signal Extraction Techniques, and Time-delay Estimation
… receiver faces the challenge of demodulating the signal of interest (SOI) in the presence of excessive amounts of Co-Channel Interference (CCI) from a large number of sources. This results in the overloaded environment where the number of near-equal power co-channel interferers exceeds the number …
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Transmission Strategies for Wireless Multi-user, Multiple-Input, Multiple-Output Communication Channels
Multiple-Input, Multiple-Output (MIMO) processing techniques for wireless communication are of interest for next-generation systems because of their potential to dramatically improve capacity in some propagation environments. When used in applications such as wireless LAN and cellular telephony, …
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Characterising Spatial and Temporal Ionospheric Variability with a Network of Oblique Angle-of-arrival and Doppler Ionosondes
… connected to each element of two twin-arm arrays, a total of eleven AoA paths of between 900 and 2700 km were collected, including nine with interleaved Doppler measurements using a special channel scattering function (CSF) capability. On-board signal processing was developed to perform …
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Microphone array processing for augmented listening
… work explores the benefits of large microphone arrays, including novel wearable devices and distributed sensor networks, for augmented listening systems. Perceptually transparent space-time remixing filters can apply separate processing to each sound source to modify the auditory scene perceived …
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Electromagnetic Vector-Sensor Direction-of-Arrival Estimation in the Presence of Interference
This research investigates signal processing involving a single electromagnetic vector-sensor, with an emphasis on the problem regarding signal-selective narrowband direction-of-arrival (DOA) estimation in the presence of interference. The approach in this thesis relies on a high-resolution …
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Improving Implantable Medical Device Security Through Cooperative Jamming
… form-factor devices with limited battery and processing power. Most IMDs have wireless capabilities that allow them to share data with an offboard programming device, such as a smartphone application, that has more storage and processing power than the IMD itself. Additionally, the programming …