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Design of wide-band array with frequency invariant beam pattern by using adaptive synthesis method

Design of wide-band array with frequency invariant beam patt...

引用

3rd International Conference on Image Analysis and signal processing, IASP 2011

作者： Zhu, Weijie Wu, Wei Dept. of Communication Engineering Engineering College of Armed Police Force Xi'an China

ISBN: (纸本)9781612848808

Based on adaptive technique, a method for designing wide-band array with frequency invariant beam pattern is presented in this paper. For a given beam pattern, the entire design process can be completed automatically by a computer without deriving expressions of weight vector. The design process is divided into three steps: design the beamformer by numerical method at reference frequency and obtain the weight coefficient;within the operation frequency range, design the beamformer by adaptive simulation technique at other frequency points and obtain the weight coefficient under which the beam pattern is the same with the desired beam pattern;design FIR filter and evaluate the filter coefficient for a FIR filter frequency response specified by the weight coefficient of each channel. The proposed method can be applied to an arbitrary array and have no restriction on sensor patterns. This method is valuable in practical engineering. © 2011 ieee.

关键词： FIR filters

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Deterministic blind identification in antenna array processing

Deterministic blind identification in antenna array processi...

引用

sensor array and multichannel signal processing workshop

作者： Souleymen Sahnoun Pierre Comon GIPSA-Lab CNRS UMR5216 France

The estimation of directions of arrival is formulated as the decomposition of a 3-way array into a sum of rank-one terms. However, a low-rank tensor approximation does not always exist. We propose an optimization technique based on differentiable angular constraints on the factors, ensuring the existence of the low-rank tensor decomposition. The efficiency of the proposed algorithm is demonstrated via numerical simulations, and compared to Cramér-Rao bounds.

关键词： arrays signal processing algorithms Estimation Direction-of-arrival estimation Tensile stress Vectors

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Low Complexity Channel Estimation Based on DFT for Short Range Communication

Low Complexity Channel Estimation Based on DFT for Short Ran...

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ieee International Conference on Communications (ICC) / Wireless Communications Symposium / 3rd workshop on Optical Wireless Communications (OWC)

作者： Wang, Gaojian Naeimi, Shaghayegh Aghabozorgi Ascheid, Gerd Rhein Westfal TH Aachen Chair Integrated Signal Proc Syst Aachen Germany

ISBN: (纸本)9781467389990

In a practical large scale antenna system (LSAS) over the millimeter Wave (mm Wave) bands, the implementation of hybrid beamforming structure plays an important role as it provides high precoding gains to overcome the high path loss and achieve sufficient link margins. While employing such large antenna arrays, it becomes challenging to estimate the mmWave channel using the conventional algorithms. In this paper, we develop two novel multi-resolution mmWave channel estimation algorithms that exploit two dimensional discrete Fourier transform technique inspired by the sparse nature of the mmWave channel. The proposed algorithms take into account practical radio frequency (RF) hardware limitations and computational complexity reduction during the training phases. Numerical results indicate that the proposed algorithms can achieve a comparable spectral efficiency with respect to the case when perfect channel state information is known.

关键词： array signal processing Radio frequency Training Channel estimation Antenna arrays Receivers Niobium

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An IoT Service-Oriented System for Agriculture Monitoring

An IoT Service-Oriented System for Agriculture Monitoring

引用

ieee International Conference on Communications (ICC) / Wireless Communications Symposium / 3rd workshop on Optical Wireless Communications (OWC)

作者： Cambra, Carlos Sendra, Sandra Lloret, Jaime Garcia, Laura Univ Politecn Valencia Valencia Spain Univ Granada Dept Signal Theory Telemat & Commun TSTC Granada Spain

ISBN: (纸本)9781467389990

Wireless sensor Networks (WSNs), Internet of things (IoT) and aerial mapping are nowadays being used very much in agriculture. The challenge of joining those technologies requires a new and smart wireless network topology for devices communication. Problems like scalability and manageability are important challenges when there are many devices. This paper presents the design of a smart IoT communication system manager used as a low cost irrigation controller. The proposal is a powerful irrigation tool that uses real time data such as the variable rate irrigation and some parameters taken from the field. The field parameters, the index vegetation (estimated using aerial images) and the irrigation events, such as flow level, pressure level or wind speed, are periodically sampled. Data is processed in a smart cloud service based on the Drools Guvnor (a Business Rules Manager). The developed multimedia platform can be controlled remotely by a mobile phone. Finally, we measured the bandwidth consumed when the system is sending different kinds of commands and data.

关键词： Dula processing system sensor data integration Agro IoT Wireless sensor Network Farming Data SOA Service Integration

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Underwater sensor networks, oceanography and plankton assemblages

Underwater sensor networks, oceanography and plankton assemb...

引用

3rd Intelligent sensors, sensor Networks and Information processing Conference

作者： Bondarenko, Olga Kininmonth, Stuart Kingsford, Michael James Cook Univ North Queensland Sch Marine & Trop Biol Townsville Qld 4810 Australia Australian Inst Marine Sci Townsville Qld 4819 Australia

ISBN: (纸本)9781424415014

The Great Barrier Reef Australia (GBR) is affected by cold water intrusions originating in the Coral Sea and upwelled on the reef Therefore biological interest in GBR upwellings has been driven by the view that upwelled waters rich in nutrients boost plankton production and overall productivity of the GBR system. We propose to employ a Wireless sensor Network (WSN) for in situ monitoring of upwellings. Temperature is a good proxy for upwellings however 3D dense spatial data is required to describe upwellings and their impact on plankton abundance. The array of underwater sensors was deployed at various depths on the coral reef in Nelly Bay, Magnetic Island, GBR. We propose that the temperature data is communicated real time using RF signal to the on-shore base station. WSN has capability to communicate temperature data in real time thus offering the opportunity for rapid response times to measure the biological impact of upwellings on reef assemblages. This permits us to collect the plankton data in real-time synchronized to the temperature changes. This paper outlines the methods of the deployment of WSN for ecological research. It also describes preliminary results.

关键词： Wireless sensor networks

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Robust Resource Allocation and Clustering Formulation for Multicast C-RAN with Impaired CSI

Robust Resource Allocation and Clustering Formulation for Mu...

引用

ieee International Conference on Communications (ICC) / Wireless Communications Symposium / 3rd workshop on Optical Wireless Communications (OWC)

作者： Chen, Di Kuehn, Volker Univ Rostock Inst Commun Engn Rostock Germany

ISBN: (纸本)9781467389990

In this paper, we study the robust design of downlink multicast Cloud Radio Access Network (C-RAN), equipped with wireless backhaul. Due to feedback delays, channel estimation or quantization errors, etc., only impaired Channel State Information (CSI) might be available at the Central Processor (CP). In order to achieve a power-efficient system, we aim to minimize the network power cost while guarantee the Quality of Service (QoS) for all delivered contents, under several practical constraints of C-RAN. Despite the uncertainties introduced by the impaired CSI, we propose an algorithm, yielding a robust backhaul resource and power allocation mechanism. Moreover, the clustering formulation for Radio Units, as well as the robust multicast beamforming vectors, can also be derived. Numerical results demonstrate the effectiveness of such robust design in counteracting the channel uncertainties, and confirm the robustness in fulfilling the network constraints.

关键词： Robustness Wireless communication Resource management array signal processing Quality of service Downlink Interference

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ANALYSIS OF 3-D SHAPE ESTIMATION USING BISTATIC MULTI-CHANNEL RADAR SYSTEMS

ANALYSIS OF 3-D SHAPE ESTIMATION USING BISTATIC MULTI-CHANNE...

引用

2008 ieee sensor array and multichannel signal processing workshop

作者： Parham Hashemzadeh Thomas Rylander Mats Viberg Department of Signals and System Chalmers University of Technology Gothenburg Sweden

We estimate the radius of a perfect electric conductor (PEC) half-sphere placed on a ground plane, given six bi-conical antennas that suffer from manufacturing errors. The results are complemented by an analytical model of the sensor system and the scatterer. The analytical model includes the front-end electronics in combination with the antenna radiation impedance and the radiation field function.

关键词： Dipole antennas Receiving antennas Impedance Transmitting antennas Analytical models Equivalent circuits Antennas

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Research on GISC Image Reconstruction Algorithm Based on Area array CCD Image sensor 3

Research on GISC Image Reconstruction Algorithm Based on Are...

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3rd International signal processing, Communications and Engineering Management Conference, ISPCEM 2023

作者： Shen, Ziyi Li, Meixuan Yang, Zhipeng Wang, Honglin Fan, Xiaofei Yang, Feng Jilin Engineering Normal University Changchun China Institute for Interdisciplinary Quantum Information Technology Jilin Engineering Normal University Changchun China

ISBN: (纸本)9798350307023

Ghost imaging sparsity constraints (GISC) spectral camera can acquire both spatial and spectral information of surface features, and has significant application prospects in the field of satellite remote sensing. This article uses a planar CCD image sensor for photoelectric detection, and then reconstructs multispectral images through image reconstruction algorithms. The article describes the theoretical foundation, related technologies, and image reconstruction algorithms of GISC. Reconstruct the three-dimensional spectral image of the target through single exposure detection of the speckle field and pre calibrated measurement matrix. The research results have advantages such as high energy utilization rate, fast information acquisition efficiency, and the ability to obtain three-dimensional data information with a single exposure. © 2023 ieee.

关键词： Energy utilization

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Closed-form expression of the Weiss-Weinstein bound for 3D source localization: The conditional case

Closed-form expression of the Weiss-Weinstein bound for 3D s...

引用

sensor array and multichannel signal processing workshop

作者： Dinh Thang Vu Alexandre Renaux Rémy Boyer Sylvie Marcos Laboratoire des signaux et systèms (L2S) CNRS SUPELEC Université Paris-Sud XI Gif-sur-Yvette France

In array processing, lower bounds are used as a benchmark to evaluate the ultimate performance of estimators. Among these bounds, the Weiss-Weinstein bound (WWB) is known as the tightest bound of Weiss-Weinstein family, and is able to predict the threshold effect of estimator's mean square error (MSE) at low signal-to-noise ratio (SNR) and/or at low number of snapshots. In this paper, we derive a closed-form expression of the WWB for 3D source localization using an arbitrary planar antenna array in the case of a deterministic known signal. The presented results are shown to be useful for system design such as array geometry optimization.

关键词： arrays Estimation signal to noise ratio Closed-form solution Three dimensional displays Direction of arrival estimation

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EXPERIMENTAL EVALUATION OF THE JOINT POSITION-PITCH ESTIMATION (POPI) ALGORITHM IN NOISY ENVIRONMENTS

EXPERIMENTAL EVALUATION OF THE JOINT POSITION-PITCH ESTIMATI...

引用

2008 ieee sensor array and multichannel signal processing workshop

作者： Tania Habib Marian Kepesi Lukas Ottowitz Signal Processing and Speech Communication Laboratory Graz University of Technology Austria

This paper proposes an enhancement and evaluates the performance of a recently proposed method for joint extraction of pitch and direction of arrival for speaker localization. We propose a new weighting function in order to suppress the cross-terms of the aforementioned method. The performance of the method is evaluated by measuring the correct estimate of position at a frame level. This evaluation analyzes the limits of the method at different background noise levels by using real world recordings. The results show that the proposed algorithm gives more consistent location estimates leading to a reduction in angular deviation by 4.23°at -3 dB SNR.

关键词： signal to noise ratio signal processing algorithms Microphones Joints Speech Estimation Noise measurement

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