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Two-hop communication with energy harvesting

Two-hop communication with energy harvesting

引用

2011 4th ieee international workshop on computational advances in multi-sensor adaptive processing, CAMSAP 2011

作者： Gündüz, Deniz Devillers, Bertrand 08860 - Castelldefels Barcelona Spain

ISBN: (纸本)9781457721052

Communication nodes with the ability to harvest energy from the environment have the potential to operate beyond the timeframe limited by the finite capacity of their batteries;and accordingly, to extend the overall network lifetime. However, the optimization of the communication system in the presence of energy harvesting devices requires a new paradigm in terms of power allocation since the energy becomes available over time. In this paper, we consider the problem of two-hop relaying in the presence of energy harvesting nodes. We identify the optimal offline transmission scheme for energy harvesting source and relay when the relay operates in the full-duplex mode. In the case of a half-duplex relay, we provide the optimal transmission scheme when the source has a single energy packet. © 2011 ieee.

关键词： Energy harvesting

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A computationally efficient robust adaptive beamforming for general-rank signal model with positive semi-definite constraint

A computationally efficient robust adaptive beamforming for ...

引用

2011 4th ieee international workshop on computational advances in multi-sensor adaptive processing, CAMSAP 2011

作者： Khabbazibasmenj, Arash Vorobyov, Sergiy A. Dept. Electrical and Computer Engineering University of Alberta Edmonton AB T6G 2V4 Canada

ISBN: (纸本)9781457721052

The robust adaptive beamforming problem for general-rank signal model with positive semi-definite (PSD) constraint is considered. The existing approaches for solving the corresponding non-convex optimization problem are iterative methods for which the convergence is not guaranteed. Moreover, these methods solve the problem only suboptimally. We revisit this problem and develop a new beamforming method based on a new solution for the corresponding optimization problem. The new proposed method is iterative and is based on a reformulation and then linearization of a single non-convex difference-of-two-convex functions (DC) constraint. Our simulation results confirm that the new proposed method finds the global optimum of the problem in few iterations and outperforms the state-of-the-art robust adaptive beamforming methods for general-rank signal model with PSD constraint. © 2011 ieee.

关键词： Iterative methods

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Clutter rejection for MTI radar using a single antenna and a long integration time

Clutter rejection for MTI radar using a single antenna and a...

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2011 4th ieee international workshop on computational advances in multi-sensor adaptive processing, CAMSAP 2011

作者： Goy, Philippe Vincent, Francois Tourneret, Jean-Yves Rockwell-Collins France 6 avenue Didier Daurat 31701 Blagnac France Department Electronics Optronics and Signal University of Toulouse/ISAE Toulouse France University of Toulouse IRIT-ENSEEIHT 2 rue Camichel Toulouse France

ISBN: (纸本)9781457721052

Moving Target Indicators (MTI) are airborne radar systems designed to detect and track moving vehicles or aircrafts. In this paper, we address the problem of detecting hazardous collision targets to avoid them. One of the best known solutions to solve this problem is given by the so-called Space-Time adaptive processing (STAP) algorithms which optimally filter the target signal from interference and noise exploiting the specific relationship between Direction Of Arrival (DOA) and Doppler for the ground clutter. However, these algorithms require an antenna array and multiple reception channels that increase cost and complexity. The authors propose an alternative solution using a single antenna only. In addition to the standard Doppler shift related to the radial speed, the orthoradial speed of any target can be estimated if using a long integration time. Dangerous targets and ground clutter have different signatures in the radial-orthoradial velocity plane. An optimal detector is then proposed based on the oblique projection onto the signal subspace orthogonal to the clutter subspace. The theoretical performances of this detector are derived and a realistic radar scene simulation shows the benefits of this new MTI detector. © 2011 ieee.

关键词： Space time adaptive processing

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Two-hop communication with energy harvesting

Two-hop communication with energy harvesting

引用

ieee international workshop on computational advances in multi-sensor adaptive processing (CAMSAP)

作者： Deniz Gündüz Bertrand Devillers Centre Tecnològic de Telecomunicacions de Catalunya Barcelona Spain

Communication nodes with the ability to harvest energy from the environment have the potential to operate beyond the timeframe limited by the finite capacity of their batteries; and accordingly, to extend the overall network lifetime. However, the optimization of the communication system in the presence of energy harvesting devices requires a new paradigm in terms of power allocation since the energy becomes available over time. In this paper, we consider the problem of two-hop relaying in the presence of energy harvesting nodes. We identify the optimal offline transmission scheme for energy harvesting source and relay when the relay operates in the full-duplex mode. In the case of a half-duplex relay, we provide the optimal transmission scheme when the source has a single energy packet.

关键词： Relays Energy harvesting Schedules Batteries Resource management Optimization Wireless communication

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Passive imaging using cross correlations of ambient noise signals

Passive imaging using cross correlations of ambient noise si...

引用

3rd ieee international workshop on computational advances in multi-sensor adaptive processing (CAMSAP)

作者： Garnier, Josselin Papanicolaou, George Univ Paris 07 Lab Probabilites & Modeles Aleatoires 2 Pl Jussieu F-75251 Paris 5 France Stanford Univ Dept Math Stanford CA 94305 USA

ISBN: (纸本)9781424451791

It is possible to estimate the travel time or even the full Green's function between two passive sensors from the cross correlation of recorded signal amplitudes generated by ambient noise sources. Using the stationary phase method we show that it is possible to image reflectors buried in a smoothly varying medium by migrating the cross correlations of the noise signals.

关键词： Travel time

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Passive imaging and detection in cluttered media

Passive imaging and detection in cluttered media

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3rd ieee international workshop on computational advances in multi-sensor adaptive processing (CAMSAP)

作者： Garnier, Josselin Solna, Knut Univ Paris 07 Lab Probabilites & Modeles Aleatoires 2 Pl Jussieu F-75251 Paris 5 France Univ Calif Irvine Dept Math Irvine CA 92697 USA

ISBN: (纸本)9781424451791

In this paper we consider passive sensor imaging with ambient noise sources by suitably migrating the cross correlations of the recorded signals. We use an imaging functional that relates to the classic Kirchhoff migration functional. We analyze the properties of the imaging functional in the high-frequency regime which shows that it produces sharp images. We identify the scaling assumptions that allow us to image respectively, the support of the random sources and the medium variations when these may come in the form of clutter. Numerical simulations confirm the theoretical predictions.

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Hybrid Probabilistic Data Association and Variational Filtering for multi-Target Tracking in Wireless sensor Networks

Hybrid Probabilistic Data Association and Variational Filter...

引用

3rd ieee international workshop on computational advances in multi-sensor adaptive processing (CAMSAP)

作者： Teng, Jing Snoussi, Hichem Richard, Cedric Zhou, Yi ICD/LM2S University of Technology of Troyes 10000 12 rue Marie Curie France

ISBN: (纸本)9781424451807

A hybrid signal processing scheme is proposed for distributed multi-target tracking (MTT). For the sake of resource efficiency in a wireless sensor network (WSN), we reduce the problem to parallel cluster-based single target tracking when the targets are far apart, and switch to MTT only when data association becomes ambiguous. A sequential monte carlo method is employed to assign the ambiguous observations to specific targets or clutter, based on association probabilities. Whereas the rest observations are incorporated by the variational filter, which approximates the distribution of involved particles by a simple Gaussian distribution for each target. The natural and adaptive message compression dramatically reduces the resource consumption of the WSN. The low computation complexity also guarantees the one-line execution of the hybrid MTT scheme. In addition, experimental results prove that the proposed scheme succeeds in distinguishing and tracking multiple targets even during the occlusions.

关键词： Wireless sensor networks

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Improving Distributed Space-Time Coding Through Combining at the multiple-Antenna Relay

Improving Distributed Space-Time Coding Through Combining at...

引用

3rd ieee international workshop on computational advances in multi-sensor adaptive processing (CAMSAP)

作者： Jing, Yindi Univ Alberta Edmonton AB T6G 2M7 Canada

ISBN: (纸本)9781424451791

Distributed space-time coding (DSTC) is a cooperative scheme proposed for wireless relay networks that achieves full diversity when the transmit power is infinitely high. In this paper, we propose to employ maximum-ratio combining (MRC) at the multiple-antenna relay to improve the performance of DSTC. Simulations and analysis show that the new scheme achieves a much better performance in relay networks than DSTC. In some network scenarios, it can even improve the scaling of the error rate with the transmit power. Furthermore, the new scheme requires a shorter training interval than DSTC.

关键词： Antennas

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Fragment-based Variational Visual Tracking

Fragment-based Variational Visual Tracking

引用

3rd ieee international workshop on computational advances in multi-sensor adaptive processing (CAMSAP)

作者： Zhou, Yi Snoussi, Hichem Zheng, Shibao Richard, Cedric Teng, Jing Univ Technol Troyes ICD LM2S 12 Rue Marie Curie F-10000 Troyes France Shanghai Jiao Tong Univ Inst Image Commun & Informat Shanghai 200240 Peoples R China

ISBN: (纸本)9781424451791

We propose a Bayesian tracking algorithm based on adaptive fragmentation and variational approximation. By using the cue of gradient, we fragment the target into disconnected rectangles and reduce the confusion from the background. To handle the uncertainties in real tracking case, we choose the Bayesian framework with a variational implementation. The parameters of the variational inference are updated according to the observation and to the weights of the voting candidates. Experimental results show that our tracker outperforms directive searching and particle filtering. Furthermore, due to the simplicity of calculation, the proposed method can be applied to real-time surveillance systems.

关键词： Approximation algorithms

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Distributed Space-Time Code Designs Via Cayley Transform

Distributed Space-Time Code Designs Via Cayley Transform

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3rd ieee international workshop on computational advances in multi-sensor adaptive processing (CAMSAP)

作者： Jing, Yindi Univ Alberta Dept Elect & Comp Engn Edmonton AB T6G 2M7 Canada

ISBN: (纸本)9781424451807

Distributed space-time coding achieves full diversity in wireless relay networks without channel information at the relays. This paper is on the design of specific distributed space-time codes. By Cayley transform, the design of unitary matrices is transformed to that of Hermitian matrices. Gradient-descent method is used in the optimization to find codes that are "close" to orthogonal designs, which is known to be optimal in both coding gain and diversity. The proposed code design method can be used for networks with any relays and transmission rate. The optimized codes are adaptive to the information symbol constellation. Simulation shows that the designed codes achieve full diversity, and outperform the random code and other existing distributed space-time codes.

关键词： Optimization

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