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 85 for “"Array Processing"”.
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Acoustic vector-sensor array processing
… theory yields useful performance criteria and 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 …
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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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Sensor Array Processing with Manifold Uncertainty
… realizable source locations for a given array configuration is referred to as the array manifold. In this thesis, array manifold ambiguities for linear arrays of omni-directional sensors in non-dispersive fields are considered. </p><p>First, the problem of underwater a hydrophone array …
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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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Novel Approaches to Overloaded Array Processing
An antenna array is overloaded when the number of cochannel signals in its operating environment exceeds the number of elements. Conventional space-time array processing for narrow-band signals fails in overloaded environments. Overloaded array processing (OLAP) is most difficult when signals …
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Array Processing Techniques for Broadband Acoustic Beamforming
… limited and physically large. A microphone array used in conjunction with a beamforming algorithm can acquire and spatially filter the signal, but traditionally this has suffered from limitations similar to those of the purely acoustic designs. The work presented in this paper attempts to …
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Efficient Array Processing for Partial Signal Coherence
With the growing use of antenna arrays for enhancing signal detection, estimation, interference cancellation, and position location comes the need to better understand the spatial properties of the received signals. To allow for simple and efficient implementation required in real-time processing …
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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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Robust vector sensor array processing and performance analysis
… A sizable literature exists on the theory of processing signals for many vector sensor array applications. In practice, however, mismatch (the difference between the assumed and actual system configurations), several noise processes and low sample support can pose significant problems. …
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Estimates of crustal transmission losses using MLM array processing
Seismic refraction experiments have been used extensively in the past thirty five years in investigations of the structure of the oceanic crust. The longer range of the refraction or wide angle reflection technique, on the order of tens of kilometers, permits a deeper and wider area of examination, …
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Overloaded Array Processing with Spatially Reduced Search Joint Detection
An antenna array is overloaded when the number of cochannel signals in its operating environment exceeds the number of elements. Conventional space-time array processing for narrow-band signals fails in overloaded environments. Overloaded array processing (OAP) is most difficult when signals …
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Fast order-recursive Hermitian Toeplitz eigenspace techniques for array processing
… radiating sources using a passive sensor array. One of the early limitations was the computational load involved in arriving at the eigendecompositions. The introduction of VLSI circuits and parallel processors however, has reduced the cost of computation A tremendously. As a consequence, …
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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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Array Processing for Mobile Wireless Communication in the 60 GHz Band
… attenuation due to oxygen absorption. Antenna arrays have been proposed as a means of combating these effects. This thesis provides an analysis of array processing for communication systems operating in the 60 GHz band. Based on measurement campaigns at 60 GHz, deterministic modeling of the …
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ARRAY PROCESSING TECHNIQUES FOR ESTIMATION AND TRACKING OF AN ICE-SHEET BOTTOM
Ice bottom topography layers are an important boundary condition required to model the flow dynamics of an ice sheet. In this work, using low frequency multichannel radar data, we locate the ice bottom using two types of automatic trackers. First, we use the multiple signal classification (MUSIC) …
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The location-estimating, null-steering (LENS) algorithm for adaptive microphone-array processing
… Null-Steering (LENS) algorithm for adaptive array beamforming in the case of a. known target location. Such beamformers are useful in spatial-filtering applications that enhance a desired target source while attenuating non-target, jammer sources in a given environment. Although LENS is …
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Overloaded Array Processing: System Analysis, Signal Extraction Techniques, and Time-delay Estimation
… interferers exceeds the number of antenna array elements. This thesis first analyzes the interference environment experienced by an airborne cellular repeater flying at high altitudes. Link budget analysis using a two-ray propagation model shows that the antenna array mounted on an airborne …
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