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共 931 条记录，以下是111-120 订阅

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Multiple Target Tracking Using a Narrowband RF sensor array

Multiple Target Tracking Using a Narrowband RF Sensor Array

引用

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

作者： Kreucher, Chris Himed, Braham Integr Applicat Inc Ann Arbor MI 48108 USA US Air Force Res Lab RYMD WPAFB RF Technol Branch Columbus OH USA

ISBN: (纸本)9781467310710

this paper describes a method for detecting and tracking multiple moving targets using a multistatic narrowband radar sensor array. We show that the appropriate model for the sensor array measurements is non-linear and the statistics are non-Gaussian. We use this model in conjunction with a Bayesian estimation algorithm which constructs a probability density on the number of targets and their states. the density is approximated using a novel hybrid discrete grid/particle filter. We evaluate the performance on a set of experimental data from a 6-channel array to detect and track two targets that cross, make sharp turns, and move nearly cross-radially to some pairs for a significant portion of the collect.

关键词： multiple target tracking Narrowband sensor arrays Non-Gaussian Target tracking

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Analog Beamformer Design for Interference Exploitation based Hybrid Beamforming 10

Analog Beamformer Design for Interference Exploitation based...

引用

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

作者： Hegde, Ganapati Masouros, Christos Pesavento, Marius Tech Univ Darmstadt Commun Syst Grp Darmstadt Germany UCL Dept Elect & Elect Engn London England

ISBN: (纸本)9781538647523

Hybrid analog-digital beamforming has been shown to reduce hardware cost and power consumption in massive MIMO systems, at the expense of increased radiated power for given performance targets. To alleviate the above shortfall, in this paper we exploit the concept of constructive interference (CI) that has been shown to offer significant radiated power savings in fully-digital multi-user downlink MIMO systems. We explore analog beamforming design, and develop solutions specifically tailored for CI-based hybrid beamforming. We also evaluate the performance of the presented techniques and their computational complexities using simulation results.

关键词： array signal processing Radio frequency Antennas sensor arrays Conferences MIMO communication"

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Non-Coherent Source Localization with Distributed sensor array Networks 12

Non-Coherent Source Localization with Distributed Sensor Arr...

引用

ieee 12th sensor array and multichannel signal processing workshop (SAM)

作者： Wan, Zhengyu Liu, Wei Willett, Peter Univ Sheffield Dept Elect & Elect Engn Sheffield S Yorkshire England Univ Connecticut Dept Elect & Comp Engn Storrs CT USA

ISBN: (纸本)9781665406338

the non-coherent source localization problem based on distributed sensor arrays can be formulated into a group sparsity based phase retrieval problem where only the magnitude (absolute value) of the received signals is available. Under such a framework, a two-dimensional localization method is proposed. Unlike traditional source localization methods, random phase errors at sensors of the distributed array will not affect estimation results by the proposed method. Simulation results indicate that the proposed non-coherent source localization method outperforms the traditional one in the presence of large phase errors, while still maintains an acceptable accuracy in the absence of phase errors.

关键词： Target localization distributed sensor array magnitude-only measurements group sparsity non-coherent detection

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Low-cost Multi-channel Underwater Acoustic signal processing Testbed

Low-cost Multi-channel Underwater Acoustic Signal Processing...

引用

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

作者： Blom, Koen C. H. Wester, Rinse Kokkeler, Andre B. J. Smit, Gerard J. M. Univ Twente Dep Elect Engn Math & Comp Sci POB 217 NL-7500 AE Enschede Netherlands

ISBN: (纸本)9781467310710

Current systems for multi-channel underwater signal processing suffer from a tied relation between the hardware and physical layer software or require a large amount of engineering work. To provide a low-cost, small form factor and flexible solution, this work presents a multi-channel testbed consisting of an off-the-shelf FPGA board and a simple expansion board. Nonetheless, the proposed testbed provides the flexibility and processing power to evaluate novel multi-channel physical layer algorithms.

关键词： underwater communication phased arrays Field Programmable Gate arrays (FPGAs)

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Performance Analysis of Time frequency Subspace based Direction Finding algorithms in presence of perturbed array manifold

Performance Analysis of Time frequency Subspace based Direct...

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

作者： Belouchrani, Adel Khodja, Mohamed Ecole Natl Polytech Dept Elect Engn Algiers Algeria

ISBN: (纸本)9781479914814

Conventional subspace based direction finding approaches such as MUSIC and ESPRIT algorithms commonly use the array data covariance matrix. In non stationary context, the use of the Spatial Time-Frequency Distribution (STFD) instead of the covariance matrix can significantly improve the performance of such algorithms. In this paper we are interested in the performance analysis of such approaches in the presence of both additive noise and perturbed array manifold. An unified expression of the Direction Of Arrival (DOA) error estimation is derived for both approaches. the obtained results show that for low signal to Noise Ratio (SNR) and high signal to sensor Perturbation Ratio (SPR) the STFD based DOA estimations perform better, while for high SNR and for the same SPR both Covariance and STFD based approaches have similar performance.

关键词： direction finding variance covariance matrix low SNR Direction of arrival estimation high SNR Subspace Multiple signal classification Additive noise Manifolds Covariance United States Department of Agriculture based Covariance matrix

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Multiple Source Resolution for True Time Delay Beam-Space processing

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

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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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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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A GNSS Structural Interference Mitigation Technique Using Antenna array processing

A GNSS Structural Interference Mitigation Technique Using An...

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

作者： Daneshmand, Saeed Jafarnia-Jahromi, Ali Broumandan, Ali Lachapelle, Gerard Univ Calgary Schulich Sch Engn Posit Locat & Nav PLAN Grp Calgary AB T2N 1N4 Canada

ISBN: (纸本)9781479914814

Position solutions provided by Global Navigation Satellite Systems (GNSS) can be completely misled by structural interference or spoofing threats. An approach utilizing an antenna array is proposed in order to suppress spoofing attacks. the proposed method is based on the assumption that all spoofing signals are transmitted from a single point source. A spatial domain processing technique is proposed to extract the spoofing signal steering vector and consequently to discard the spoofing signals. this method is implemented before despreading and acquisition stage of a GNSS receiver. Hence, it does not impose a heavy computational load on the receiver operational process since it does not require any extensive search in the code and Doppler domains to separately despread individual authentic and spoofing signals. Moreover, the proposed method does not require any antenna array calibration process. this pre-despreading interference mitigation technique is further extended to maximize signal-to-noise ratio (SNR) of each individual authentic GNSS signal. Simulation results show that the proposed method effectively countermeasures spoofing attacks for a wide range of received spoofing power.

关键词： Spoofing disturbance suppression computer information security Antenna arrays Global Navigation Satellite System array processing signal to noise ratios

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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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