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检索条件"任意字段=2008 IEEE Sensor Array and Multichannel Signal Processing Workshop"

共 1267 条记录，以下是161-170 订阅

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Multiple Source Resolution for True Time Delay Beam-Space processing

Multiple Source Resolution for True Time Delay Beam-Space Pr...

引用

ieee 7th sensor array and multichannel signal processing workshop (SAM)

作者： Wilkins, Nathan Shaw, Arnab USAF Res Lab Munit Directorate Eglin AFB FL 32542 USA Wright State Univ Dept Elect Engn Dayton OH USA

ISBN: (纸本)9781467310710

The authors examine a technique to apply coherent signal subspace processing in the beam-space of a bank of true time delay beamformers. The technique is shown to be capable of resolving closely spaced sources while being inherently wideband in nature, computationally less expensive than many previous wideband coherent integration techniques, and does not rely on a preliminary angle of arrival estimate. The technique is examined for performance with various levels of noise in the system compared to previous methods and the Cramer-Rao theoretical performance bound.

关键词： true time delay Noise levels space processing Angle of arrival broadband coherent integration coherent signal beamformers

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Amplify-and-Forward Compressed Sensing as a PHY-Layer Secrecy Solution in Wireless sensor Networks

Amplify-and-Forward Compressed Sensing as a PHY-Layer Secrec...

引用

ieee 7th sensor array and multichannel signal processing workshop (SAM)

作者： Barcelo-Llado, J. E. Morell, Antoni Seco-Granados, Gonzalo Univ Autonoma Barcelona Dpt Telecom & Syst Engn E-08193 Barcelona Spain

ISBN: (纸本)9781467310710

Results in distributed compressed sensing show that this technique can be applied to wireless sensor networks in order to reduce the power consumption and the amount of channel uses. In this paper we extend such results with the study of the physical layer secrecy performance. In particular, we focus on an amplify-and-forward compressed sensing scheme (AF-CS) for the case when malicious eavesdropping nodes are listening. We demonstrate that this scheme achieves perfect secrecy in presence of one eavesdropper (and also for a small number of them). We also show that a very high number of eavesdropping nodes are required to perfectly recover the signal in comparison to other distributed compressed sensing schemes in the literature.

关键词： Compressed sensing distributed schemes physical layer secrecy sparse signals wireless sensor networks

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Exploiting array Motion for Augmentation of Co-prime arrays

Exploiting Array Motion for Augmentation of Co-prime Arrays

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8th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Ramirez, Juan, Jr. Odom, Jonathan Krolik, Jeffrey Duke Univ Dept Elect Comp Engn Durham NC 27708 USA

ISBN: (纸本)9781479914814

In this paper, we combine concepts from synthetic aperture processing and non-uniform linear array theory. Our objective is to use array motion to synthesize an array that can achieve the performance of a filled uniform linear array (ULA), but with fewer sensors than required for spatial Nyquist sampling. The class of physical arrays we use for synthesis are co-prime arrays constructed by nesting under-sampled ULA's with co-prime inter-element spacings. In particular, we use array motion to fill in missing co-array spacings. For co-prime M and N, a physical array of M + 2 N - 1 sensors plus modest array motion is used to achieve a filled co-array corresponding to approximately 2 M N elements. This facilitates spatial spectral estimation via non-adaptive beamforming over an extended aperture with low sidelobe performance.

关键词： Spectrum analysis

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SPARSE BAYESIAN LEARNING FOR DOA ESTIMATION USING CO-PRIME AND NESTED arrayS 10

SPARSE BAYESIAN LEARNING FOR DOA ESTIMATION USING CO-PRIME A...

引用

10th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Nannuru, Santosh Gerstoft, Peter Koochakzadeh, Ali Pal, Piya Univ Calif San Diego Scripps Inst Oceanog La Jolla CA 92093 USA Univ Calif San Diego Elect & Comp Engn La Jolla CA 92093 USA

ISBN: (纸本)9781538647523

Sparse Bayesian learning (SBL) has been used to obtain source direction-of-arrivals (DoAs) from uniform linear array (ULA) data. The maximum number of sources that can be resolved using a ULA is limited by the number of sensors in the array. It is known that sparse linear arrays such as co-prime and nested arrays can resolve more sources than the number of sensors. In this paper we demonstrate this using SBL. We compute the mean squared error in source power estimation as various parameters are varied.

关键词： Sparse Bayesian learning co-prime array nested array DoA estimation compressed sensing

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Sound spot generation by 128-channel surrounded speaker array

Sound spot generation by 128-channel surrounded speaker arra...

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3rd ieee sensor array and multichannel signal processing workshop

作者： Tamai, Y Kagami, S Mizoguchi, H Amemiya, Y Nagashima, K Takano, T Tokyo Univ Sci Tokyo 162 Japan

ISBN: (纸本)0780385454

This paper describes sound spot generation by 128-channel surrounded speaker array. A sound spot is a limited area within which an emitted sound is amplified. Sound spot generation is achieved by the Sum and Delay Beam Former (SDBF). A dedicated PCI 128-channel simultaneous input digital-to-analog (D/A) board is developed for a 128 channel speaker array with a maximum sampling rate of 22.7 us/sample. The 128-channel square speaker array can generate steerable a sound spot towards a specific point. Sound spots can be moved in approximately 10 ms. The speaker array can also generate different sound spots at specific points simultaneously. The performance of sound spot generation is evaluated by using sound pressure distribution maps. The speaker array can be used to that transmit necessary sound information to only a specific person in quiet places, such as a museum and a hospital.

关键词： sound spot speaker array SDBF

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Beamformer Design For Nonstationary signals by Means of Interfrequency Correlations

Beamformer Design For Nonstationary Signals by Means of Inte...

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ieee 7th sensor array and multichannel signal processing workshop (SAM)

作者： Naghibi, Tofigh Pfister, Beat ETH Comp Engn & Networks Lab Speech Proc Grp Zurich Switzerland

ISBN: (纸本)9781467310710

The wide-sense stationary assumption has been frequently employed in array processing, since it results in uncorrelated frequency bins and consequently major simplifications arise. However, unlike stationary signals, significant interfrequency correlations are observable in nonstationary signals like speech. Here, we drop the stationarity assumption and will show that taking interfrequency correlations into account leads to higher noise reduction. We develop a framework to design nonstationary beamformers similar to the stationary Frost beamformers. Based on the noise model, it can be used to design both fixed and adaptive beamformers. The nonstationary beamformer derived here is a set of time-varying filters and hence can be seen as a set of time-frequency or wavelet transform filters.

关键词： beamformers Noise models time-varying filters array processing signals setting time Noise reduction Filters

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On time-invariant FDA beam-pattern design based on time-dependent frequency offsets 11

On time-invariant FDA beam-pattern design based on time-depe...

引用

ieee 11th sensor array and multichannel signal processing workshop (SAM)

作者： Shi, Jiantao Nanjing Res Inst Elect Technol Nanjing 210039 Peoples R China CETC Key Lab Intellisense Technol Nanjing 210039 Peoples R China

ISBN: (纸本)9781728119465

In the existing works on FDA beam-patterns produced by the traditional FDA are time variant, and this causes difficulties in target detecting and beam-pattern steering. For solving the problem, several time-dependent frequency offsets based time-invariant FDA beam-pattern design methods have been proposed, which, however, neglected the time-range relationship and led to erroneous conclusions. In this note, considering the practical constraint and the relationship between time and range, it is concluded that FDA beam-patterns are always time-variant and it is unable to form time-invariant beam-patterns.

关键词： Frequency diverse array time-dependent frequency offset time-invariant beam-pattern time-range relationship

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Direction of Arrival Estimation with Microphone arrays Using SRP-PHAT and Neural Networks 10

Direction of Arrival Estimation with Microphone Arrays Using...

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10th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Diaz-Guerra, David Beltran, Jose R. Univ Zaragoza Dept Elect Engn & Commun Zaragoza Spain

ISBN: (纸本)9781538647523

The Steered Response Power with phase transform (SRP-PHAT) is one of the most employed techniques for Direction of Arrival (DOA) estimation with microphone arrays due its robustness against acoustical conditions as reverberation or noise. Among its main drawbacks is the growth of its computational complexity when the search space increases. To solve this issue, we propose the use of Neural Networks (NN) to obtain the DOA as a regression problem from a low resolution SRP-PHAT power map. The NNs can learn and exploit the information of the acoustic reflections of the room where the array is located with a training method that can be easily performed by an end user without technical knowledge.

关键词： microphone array direction of arrival DOA Sound Source Localization SSL SRP SRP-PHAT neural netowrks tele-conference system Wireless Acoustic sensor Network WASN WSN

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A Moving Horizon Convex Relaxation for Mobile sensor Network Localization

A Moving Horizon Convex Relaxation for Mobile Sensor Network...

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8th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Simonetto, Andrea Leus, Geert Delft Univ Technol Fac EEMCS NL-2826 CD Delft Netherlands

ISBN: (纸本)9781479914814

In mobile sensor network localization problems we seek to estimate the position of the mobile sensor nodes by using a subset of pair-wise range measurements (among the nodes and with mobile anchors). When the sensor nodes are static, convex relaxations have been shown to provide a remarkably accurate approximate solution to this NP-hard estimation problem. In this paper, we propose a novel convex relaxation to tackle the more challenging dynamic case and we develop a moving horizon convex estimator based on a maximum a posteriori (MAP) formulation. The resulting estimator is then compared to standard extended and unscented Kalman filters both with respect to computational complexity and performance with simulated data. The results are promising, yet a more detailed analysis is needed.

关键词： sensor networks Convexity Mobile Ganglia Kalman filters Horizon complexity classes Moving Relaxation

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Transmit Beampattern Design for Dual-Function Radar-Communication System with an Interleaved array 11

Transmit Beampattern Design for Dual-Function Radar-Communic...

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ieee 11th sensor array and multichannel signal processing workshop (SAM)

作者： Chen, Yufeng Liao, Guisheng Yang, Zhiwei Zhu, Shengqi Liu, Yongjun Jiang, Mengchao Xidian Univ Natl Lab Radar Signal Proc Xian 710071 Peoples R China

ISBN: (纸本)9781728119465

In this paper, a beampattern design method is proposed for the multi-input-multi-output (MIMO) dual-function radar-communication (DFRC) system with an interleaved array. To make full use of the whole aperture, first, the transmit array is partitioned into two interleaved subarrays, one is for radar and the other is for downlink communications. Then, both the radar waveform and communication beamformers are optimized by combining the null-space projection (NSP) method and cyclic approach (CA) to perform the coexistence of MIMO radar and downlink communications. Besides, the communication beampattern can be utilized to improve the detection performance. Finally, several numerical results are given to show the effectiveness of the proposed method.

关键词： dual-function radar-communication transmit beampattern interleaved array MIMO

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