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Planar spherical diffraction-arrays: Linear sound localization algorithms

Planar spherical diffraction-arrays: Linear sound localizati...

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Handzel, Amir A. 42 Hillcrest Circle Watertown MA 02472 USA

ISBN: (纸本)1424403081

Sound source localization systems typically measure differences in time-of-arrival between microphones in free field arrays. Using a different concept, we previously designed and built a localization system that mimics nature's solution of harnessing wave diffraction about the head while relying only on two sensors positioned antipodally. Departing from the biological constraint of two sensors, I recently showed that for broadband sources, a high acuity array could be designed with merely three microphones. Yet adding more microphones may further increase acuity and robustness. the localization algorithm we have developed uses pair-wise comparisons between microphones, the number of which increases quadratically with the number of microphones, N. In order to minimize calculations in time sensitive applications, choosing a subset of pairs may be important. I examine this issue here through simulations of a hexagonal array. thanks to the redundancy of spatial information contained in multiple microphone measurements, algorithms that are linear in N allow high acuity localization of broadband sources.

关键词： array processing

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throughput of large wireless networks on square, hexagonal and triangular grids

Throughput of large wireless networks on square, hexagonal a...

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4th ieee sensor array and multichannel signal processing workshop

作者： Hong, Kezhu Hua, Yingbo Univ Calif Riverside Dept Elect Engn Riverside CA 92521 USA

ISBN: (纸本)1424403081

Capacity analysis of sensor networks or wireless ad hoc networks has attracted a great attention in the past years. But the research in this area has primarily focused on scaling laws of arbitrary or random network instead of the exact capacity of given topologies. While the insight into how the capacity of an arbitrary or random network scales with the number of nodes in a given area is important, the exact capacity of a network depends on the network topology and can be more desirable in practice. In this paper, we compare the throughput of a large network with three possible topologies: square (rectangular), hexagonal and triangular. With a given topology, the network throughput also depends on the choice of routing protocols. We follow a synchronous array method (SAM) that is known so far to yield the highest throughout of a network on a rectangular grid.

关键词： Wireless sensor networks

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A probabilistic graphical model for microphone array source separation using rich pre-trained source models

A probabilistic graphical model for microphone array source ...

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4th ieee sensor array and multichannel signal processing workshop

作者： Attias, H. T. Golden Metall Inc San Francisco CA 94147 USA

ISBN: (纸本)1424403081

Voice based computing applications, such as phone communication and speech recognition, use microphone arrays to capture voice from a human speaker. In many environments of interest, however, sounds from other sources interfere with the speaker's voice, posing severe problems for subsequent processing. this paper describes a new framework for treating this problem, and presents and demonstrates a new algorithm for the cancellation of interfering sounds. Our framework combines techniques from statistical machine learning with ideas from speech and audio processing. An important feature involves training rich probabilistic models on data from different types of relevant sound sources. nose source models are then incorporated into a larger probabilistic model of the observed microphone data. Using that model we derive our algorithm, which is of the expectation-maximization type and infers from data the clean sound of separate individual sources. We report very good results on data recorded in different environments.

关键词： Microphones

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Design of 2-dimension sparse arrays using an improved genetic algorithm

Design of 2-dimension sparse arrays using an improved geneti...

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4th ieee sensor array and multichannel signal processing workshop

作者： Chen, Kesong He, Zishu Han, Chunlin Univ Elect Sci & Technol China Sch Elect Engn Chengdu Dichuan Peoples R China

ISBN: (纸本)1424403081

For the element position synthesis of 2-dimension sparse rectangular arrays with the design constraints of the number of elements, the aperture and the minimum element spacing, an improved genetic algorithm (IGA) based on chromosome element resetting is presented in this paper. Compared with the synthesis method of thinned arrays, this new approach could exploit more degree of freedom of elements to control the characters of the sparse arrays. When the aperture, the number of elements and the minimum element spacing are fixed identical, the new approach can make the sparse plane array produce lower peak sidelobe level (PSLL). the simulated results show that the fitness function value of thinned plane arrays with 108 elements mentioned by Haupt can reduce 5.626dB when the minimum element spacing of half wavelength was introduced into the optimization. And as well, the great efficiency and the robustness of IGA are shown in this paper.

关键词： array processing

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Airborne very long baseline interferometry and geolocation

Airborne very long baseline interferometry and geolocation

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4th ieee sensor array and multichannel signal processing workshop

作者： Carlsen, Eric C. Kolanek, James C. Sharpin, David L. Spectral Syst Inc 2611 Commons Blvd Beavercreek OH 45431 USA Signal Proc Special Goleta CA 93117 USA ATK Dayton OH 45420 USA

ISBN: (纸本)1424403081

A method is presented of performing geolocation of fixed emitters from a single, airborne platform using a two-element, very long baseline interferometer (VLBI) from 10 to 100 feet in length. the interferometer baseline is precisely tracked through a differential GPS system using auxiliary antennas placed in close proximity to the VLBI pair. A lever arm correction is applied to arrive at the VLBI baseline from the GPS measurements. A batch least squares processing algorithm is presented that operates on the interferometric phase measurements directly and resolves the associated ambiguities through global search strategies. A method of eliminating receiver phase bias by performing a difference operation is shown. Simulation results and Cramer-Rao lower bounds are also presented.

关键词： emitter location radio interferometry least squares methods radar position measurement radar signal processing

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A Method for Differentially Coherent multichannel processing of Acoustic OFDM signals

A Method for Differentially Coherent Multichannel Processing...

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

作者： Aval, Yashar M. Stojanovic, Milica Northeastern Univ Boston MA 02115 USA

ISBN: (纸本)9781467310710

We propose a low complexity array processing method for differential detection of OFDM signals over underwater acoustic channels. Partial FFT technique, developed previously for mitigating inter-carrier interference in single-channel receivers operating over time-varying channels, is extended to multichannel configuration. Performance results based on simulation and experimental data demonstrate the advantage of the proposed method compared to conventional differential and coherent detection.

关键词： array processing

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A Robust Adaptive sensor array with Slepian Sequences

A Robust Adaptive Sensor Array with Slepian Sequences

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

作者： Trump, Tonu Tallinn Univ Technol Inst Radio & Telecommun Engn Tallinn Estonia

ISBN: (纸本)9781467310710

this paper investigates an adaptive beamforming technique that is robust against imperfect knowledge of signal and interference arrival directions, antenna calibration errors and other similar imperfections. the proposed technique is based on Generalized Sidelobe Canceller but uses Slepian sequences in both the steering and blocking lobes of the algorithm. Only Slepians corresponding to large spectral concentrations are used in the branches. the theoretical results are verified in a simulation study.

关键词： arrays Robustness Eigenvalues and eigenfunctions Vectors array signal processing Transmission line matrix methods signal processing algorithms

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Antenna array Based Positional Modulation with a Two-Ray Multi-Path Model 10

Antenna Array Based Positional Modulation with a Two-Ray Mul...

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

作者： Zhang, Bo Liu, Wei Univ Sheffield Commun Res Grp Dept Elect & Elect Engn Sheffield S1 4ET S Yorkshire England

ISBN: (纸本)9781538647523

Traditional directional modulation (DM) designs are based on the assumption that there is no multi-path effect between transmitters and receivers. One problem with these designs is that the resultant systems will be vulnerable to eavesdroppers which are aligned with or very close to the desired directions, as the received modulation pattern at these positions is similar to the given one. To solve the problem, a two-ray multi-path model is studied for positional modulation and the coefficients design problem for a given array geometry and a location-optimised antenna array is solved, where the multi-path effect is exploited to generate a given modulation pattern at desired positions, with scrambled values at positions around them.

关键词： Modulation array signal processing Receivers Phased arrays sensor arrays"

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GSP based subsampling of IoT sensor networks 12

GSP based subsampling of IoT sensor networks

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

作者： Sabatini, Anna Vollero, Luca Univ Campus Biomed Roma Comp Syst & Bioinformat Lab Rome Italy

ISBN: (纸本)9781665406338

Graph signal processing (GSP) can be applied as a modeling tool to study and optimally configure IoT sensor networks. Such networks are often characterized by stringent power requirements and a high probability of sensor fault. In this scenario, understanding and governing the response on a sample of the sensors is critical to maximizing network lifetime and spreading out maintenance time. the aim of this paper is to verify the ability of the GSP to model and provide answers to these goals.

关键词： GSP IoT sampling and interpolation

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sensor scheduling using a 0-1 mixed integer programming framework

Sensor scheduling using a 0-1 mixed integer programming fram...

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4th ieee sensor array and multichannel signal processing workshop

作者： Chhetri, Amit S. Morrell, Darryl Papandreou-Suppappola, Antonia Arizona State Univ Dept Elect Engn Tempe AZ 85281 USA Arizona State Univ Dept Engn Tempe AZ 85281 USA

ISBN: (纸本)1424403081

In this paper, we propose a novel myopic sensor scheduling methodology for tracking a target moving through a network of energy-constrained acoustic sensors. Specifically, we address the problem of activating the minimum-energy combination of sensors in a network that maintains a desired squared-error accuracy in the target's position estimate. We first formulate the scheduling problem as a binary (0-1) nonlinear programming (NLP) problem. Using a linearization technique, we then convert the 0-1 NLP problem into a 0-1 mixed integer programming (MIP) problem. We solve the reformulated 01 MIP problem using a linear programming relaxation based branch-and-bound technique. We demonstrate through Monte Carlo simulations that our proposed MIP scheduling method is very computational efficient as we can find optimal solutions to scheduling problems involving 50-60 sensors with processing time in the order of seconds.

关键词： sensor networks

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