The following topics are dealt with: arrayprocessing for communications; DOA estimation and localization; radar; sensor networks and distributed estimation; beamforming; speech/audio/acoustic arrayprocessing; detect...
The following topics are dealt with: arrayprocessing for communications; DOA estimation and localization; radar; sensor networks and distributed estimation; beamforming; speech/audio/acoustic arrayprocessing; detection and estimation; blind source separation.
A Simple angular transmit diversity scheme based on switching between a pair of weakly-correlated beam patterns at one end of the wireless link (the wireless handheld terminal) in an outdoor macro-cellular radio chann...
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A Simple angular transmit diversity scheme based on switching between a pair of weakly-correlated beam patterns at one end of the wireless link (the wireless handheld terminal) in an outdoor macro-cellular radio channel is proposed. The diversity scheme is employed using a simple switched parasitic array (SPA) with a single transceiver, and an array area of 0.0625 square wavelengths. The scheme which requires no channel state information (CSI) at the transmitter, provides mainly a diversity gain to combat against multipath fading. The performance/capacity of the proposed diversity scheme is compared (through simulations) to its counterpart spatial transmit diversity scheme under the same channel conditions.
In this study, isotropic V-shaped uniform and nonuniform arrays are considered. An isotropic array has the same value for the Cramer-Rao bound (CRB) for all direction of arrival (DOA) angles. The conditions for isotro...
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ISBN:
(纸本)9781424422401
In this study, isotropic V-shaped uniform and nonuniform arrays are considered. An isotropic array has the same value for the Cramer-Rao bound (CRB) for all direction of arrival (DOA) angles. The conditions for isotropic V-shaped arrays are presented and closed form expressions for V-shaped uniform and nonuniform arrays are found. These expressions return the V-angle for the array. Therefore, given the number of sensors and sensor displacements, isotropic performance V-angle can be found easily. V-shaped arrays are compared with circular arrays and it is also shown that both uniform and nonuniform V-shaped arrays have certain advantages.
Coherent wideband DOA estimation for non-uniform linear arrays (NLA) is considered. array interpolation is used for two mappings. In the first mapping, NLA is mapped to a uniform linear array with the samearray apert...
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ISBN:
(纸本)9781424422401
Coherent wideband DOA estimation for non-uniform linear arrays (NLA) is considered. array interpolation is used for two mappings. In the first mapping, NLA is mapped to a uniform linear array with the samearray aperture. In the second mapping covariance matrices for each frequency bin are mapped to a single one at the center frequency for coherent DOA estimation. A Wiener formulation is used for array interpolation where both signal and noise powers are estimated with maximum likelihood method. Different approaches are compared and the advantages of wideband processing versus narrowband processing are outlined. The accuracy of the SNR estimation is high and it is shown that Wiener array interpolation significantly improves the DOA estimation performance in both narrowband and wideband
Seismic receiver arrays that are used in modem 3D marine surveys can also be used as 2D sensorarrays in the localization of the diffracted noise sources and hence allow attenuation of such noise from the seismic reco...
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ISBN:
(纸本)9781424422401
Seismic receiver arrays that are used in modem 3D marine surveys can also be used as 2D sensorarrays in the localization of the diffracted noise sources and hence allow attenuation of such noise from the seismic records.
We present the asymptotic performance analysis of the interpolated root-MUSIC and manifold separation (MS) techniques for direction-of-arrival (DOA) estimation in arbitrary non-uniform sensorarrays. Our analysis take...
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ISBN:
(纸本)9781424422401
We present the asymptotic performance analysis of the interpolated root-MUSIC and manifold separation (MS) techniques for direction-of-arrival (DOA) estimation in arbitrary non-uniform sensorarrays. Our analysis takes into account both the effects of a limited number of snapshots and manifold approximation errors.
A novel adaptive beamforming method is proposed without the knowledge of the direction of arrival of the signal of interest. It is a combination of the traditional beamspace processing method and a recently proposed t...
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ISBN:
(纸本)9781424422401
A novel adaptive beamforming method is proposed without the knowledge of the direction of arrival of the signal of interest. It is a combination of the traditional beamspace processing method and a recently proposed technique called "Domain Weighted Principal Component Analysis (DW-PCA)" and can be applied to the case where the signal of interest is stronger than the interfering signals in both single-path and multi-path environments. Its effectiveness is verified by simulation results.
The interplay between signalprocessing and wireless networking plays a crucial role in sensor networks deployed for detection and estimation applications. In this paper, an opportunistic power assignment strategy for...
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ISBN:
(纸本)9781424422401
The interplay between signalprocessing and wireless networking plays a crucial role in sensor networks deployed for detection and estimation applications. In this paper, an opportunistic power assignment strategy for IR-UWB sensor networks is presented which is designed to optimize detection performance in terms of the global probability of error. The opportunistic power assignment strategy utilizes both the detection error probabilities of individual sensors as well as network topology information, leading to significant performance gains compared to uniform power assignment.
The design of frequency invariant beamformers for traditional tapped delay-line array system can be formulated as a convex optimization problem and solved efficiently using the interior-point methods. This approach is...
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ISBN:
(纸本)9781424422401
The design of frequency invariant beamformers for traditional tapped delay-line array system can be formulated as a convex optimization problem and solved efficiently using the interior-point methods. This approach is extended to the recently proposed broadband beamforming system with sensor delay-lines and some variations are proposed to cope with the specific requirements in the design. Design examples are provided to show the effectiveness of the proposed method.
The performance of most existing arrayprocessing algorithms relies heavily on the precise knowledge of array manifold, which is decided by individual sensor characteristics and array configuration. A major challenge ...
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ISBN:
(纸本)9781424422401
The performance of most existing arrayprocessing algorithms relies heavily on the precise knowledge of array manifold, which is decided by individual sensor characteristics and array configuration. A major challenge for self-calibration techniques is the increased computational burden due to additional perturbation parameters. In this contribution, a novel procedure for array self-calibration is presented. We apply the well known numerical method, the Space Alternating Generalized EM algorithm (SAGE), to simplify the multi-dimensional search procedure required for finding maximum likelihood (ML) estimates. Simulation shows that the proposed algorithm outperforms existing methods that are based on the small perturbation assumption. Furthermore, the proposed algorithm remain robust in critical scenarios including large sensor position errors and closely located signals.
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