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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101-110 订阅

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Voice activity detector for microphone array processing in hand free systems

Voice activity detector for microphone array processing in h...

引用

2nd ieee sensor array and multichannel signal processing workshop

作者： Krasny, L Oraintara, S Ericsson Inc Res Triangle Pk NC USA

ISBN: (纸本)0780375513

This paper describes the use of voice activity defector (VAD) in microphone array processing for hand-free systems. Two different types of VAD are proposed using conventional and adaptive beamforming. Taking into account the fact that the speech signal is not present at all time in human conversations, both signal of interest and noise can be better estimated. Simulation results show that the VAD significantly improves the performance of the array processing algorithms. The performances of the two types of VAD are also compared in the paper.

关键词： array processing

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Multipath parameter estimation of linear chirp signals using sensor arrays

Multipath parameter estimation of linear chirp signals using...

引用

3rd ieee sensor array and multichannel signal processing workshop

作者： Aouada, R Belouchrani, A Abed-Meraim, K ENP Elect Engn Dept Algiers Algeria

ISBN: (纸本)0780385454

We consider the problem of estimating the parameters of linear chirp signals when received at a multi-sensor antenna. Exploiting the negligible variation of the parameters of interest over the coherence time of the channel, we derive a new data model that Outlines the space-time relation between the parameters. In the case of multiple chirps and single-path channels, the derived model allows the estimation of more signals than antennas. The model is directly employed in the case of a single chirp in multipath, where angles of arrival can be retrieved if more antennas than paths are available. We use a MUSIC-based estimator to recover the unknown parameters and compare its performance through simulations against the Cramer-Rao Bound.

关键词： Multipath propagation

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COMPRESSIVE SENSING IN NONSTATIONARY array processing USING BILINEAR TRANSFORMS

COMPRESSIVE SENSING IN NONSTATIONARY ARRAY PROCESSING USING ...

引用

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

作者： Zhang, Yimin D. Amin, Moeness G. Villanova Univ Ctr Adv Commun Villanova PA 19085 USA

ISBN: (纸本)9781467310710

Compressive sensing (CS) has successfully been applied to reconstruct sparse signals and images from few observations. For multi-component nonstationary signals characterized by instantaneous frequency laws, the sparsity exhibits itself in the time-frequency domain as well as the ambiguity domain. In this paper, we examine CS in the context of nonstationary array processing. We show that the spatial averaging of the ambiguity function across the array improves the CS performance by reducing both noise and cross-terms. The corresponding time-frequency distribution which is reconstructed through L-1 minimizations yields significant improvement in time-frequency signature localizations and characterizations.

关键词： array processing Compressed sensing ambiguity function bilinearity Transform

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Non-homogeneity detector for Gaussian and non-Gaussian interference scenarios

Non-homogeneity detector for Gaussian and non-Gaussian inter...

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2nd ieee sensor array and multichannel signal processing workshop

作者： Rangaswamy, M USAF Res Lab SNHE Hanscom AFB MA 01730 USA

This paper presents a statistical analysis of two schemes for intelligent STAP training data selection in Gaussian and non-Gaussian interference backgrounds. Performance analysis of the two methods is carried out usin... 详细信息

ISBN: (纸本)0780375513

关键词： Space time adaptive processing

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Sparse array Beamformer Design via ADMM 12

Sparse Array Beamformer Design via ADMM

引用

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

作者： Huang, Huiping So, Hing Cheung Zoubir, Abdelhak M. Tech Univ Darmstadt Darmstadt Germany City Univ Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9781665406338

In this paper, we devise a sparse array design algorithm for adaptive beamforming. Our strategy is based on finding a sparse beamformer weight to maximize the output signal-tointerference-plus-noise ratio (SINR). The proposed method uses the alternating direction method of multipliers (ADMM), and admits closed-form solutions at each ADMM iteration. Numerical results exhibit excellent performance of the proposed method, which is comparable to that of the exhaustive search approach.

关键词： Adaptive beamforming ADMM sparse array design output SINR

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DOA ESTIMATION EXPLOITING INTERPOLATED MULTI-FREQUENCY SPARSE array 11

DOA ESTIMATION EXPLOITING INTERPOLATED MULTI-FREQUENCY SPARS...

引用

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

作者： Zhang, Shuimei Ahmed, Ammar Zhang, Yimin D. Sun, Shunqiao Temple Univ Dept Elect & Comp Engn Philadelphia PA 19122 USA Univ Alabama Dept Elect & Comp Engn Tuscaloosa AL USA

ISBN: (纸本)9781728119465

We consider gridless direction-of-arrival (DOA) estimation of much more targets than the number of physical sensors through the exploitation of multi-frequency sparse array design and processing which increase the degrees of freedom as more frequency components are used. A modified sensor interpolation technique is developed to accurately estimate the signal covariance matrix using very few snapshots, thereby eliminating the requirement of a large number of snapshots as in conventional different coarray-based DOA estimation. Simulation results demonstrate high-resolution gridless DOA estimation capability of more targets than the number of physical sensors.

关键词： Sparse array multi-frequency sensing array interpolation direction-of-arrival estimation

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Spatial filter bank design for speech enhancement beamforming applications

Spatial filter bank design for speech enhancement beamformin...

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3rd ieee sensor array and multichannel signal processing workshop

作者： Yermeche, Z Cornelius, P Grbic, N Claesson, I Blekinge Inst Technol Sch Engn S-37225 Ronneby Sweden

ISBN: (纸本)0780385454

In this paper, a new spatial filter bank design method for speech enhancement beamforming applications is presented. The aim of this design is to construct a set of different filter banks that would include the constraint of signal passage at one position (and closing in other positions corresponding to known disturbing, sources). By performing the directional opening towards the desired location in the fixed filter bank structure, the beamformer is left with the task of tracking and suppressing the continuously emerging noise sources. This algorithm has been implemented in MATLAB and tested on real speech recordings conducted in a car hands-free communication situation. Results show that a reduction of the total complexity can be achieved while maintaining the noise suppression performance and reducing the speech distorsion.

关键词： Speech processing

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Interference Mitigation in GNSS Receivers by array signal processing: A Software Radio Approach

Interference Mitigation in GNSS Receivers by Array Signal Pr...

引用

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

作者： Arribas, Javier Closas, Pau Fernandez-Prades, Carles CTTC Castelldefels 08860 Spain

ISBN: (纸本)9781479914814

The fact that most of high-accuracy positioning and distributed timing services, including safety-critical operations, rely on Global Navigation Satellite Systems (GNSS) has raised the concern of possible denial-of-service situations. Complementary to time-and frequency-domain mitigation techniques, it is well known that antenna-array based receivers can benefit from spatial domain processing and effectively mitigate unintentional and intentional Radio Frequency Interferences (RFIs). In this work, we propose a software-based GNSS receiver architecture that implements a real-time, array-based signal acquisition algorithm based on the Generalized Likelihood Ratio Test, combined with a null-steering spatial filter for signal tracking, showing its RFI rejection capabilities.

关键词： disturbance suppression likelihood ratio test Global Navigation Satellite System Receivers Software radio Spatial filters array signal processing precise registration

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The properties of adaptive algorithms with time varying weights

The properties of adaptive algorithms with time varying weig...

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1st ieee sensor array and multichannel signal processing workshop (SAM 2000)

作者： Zatman, M MIT Lincoln Lab Lexington MA 02420 USA

ISBN: (纸本)0780363396

Most adaptive array processing schemes assume that the interference is 'wide sense stationary'. However, in practice this assumption is often violated. For example there may be motion of either the array and/or the interference during the processing interval. The asymptotic performance of two adaptive beamforming algorithms which compensate for this type of changing interference scenario are analyzed in this paper.

关键词： Adaptive algorithm Adaptive arrays Algorithm design and analysis array signal processing Covariance matrix Interference Laboratories Performance analysis signal to noise ratio Vectors

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Precoding for RadComm Systems Based on Hybrid Antenna arrays 11

Precoding for RadComm Systems Based on Hybrid Antenna Arrays

引用

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

作者： Feng, Freddy Y. P. Huang, Lei Shenzhen Univ Sch Informat Engn Shenzhen Peoples R China

ISBN: (纸本)9781728119465

Integrated wireless communications and radar detections have so far mainly relied on phased-array (PA) antennas with only considering the beampatterns in angle domain. By applying the frequency diverse array (FDA) into radar and communications (RadComm) systems, a compact dual-functional structure of joint PA and FDA is designed. Based on the built joint PA and FDA channel models, different beamformer designs are proposed by jointly optimizing the signal-to-interference-noises of the communications and radar. Numerical simulations demonstrate the performances of both communications and the radar with the proposed approaches are over than that of the conventional PA RadComm systems.

关键词： RadComm frequency divers array joint PA and FDA

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