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A Two-Step IR-UWB TOA Estimation Method Based on Two-Bit ADC

A Two-Step IR-UWB TOA Estimation Method Based on Two-Bit ADC

引用

international conference on Wireless Communications, Networking and Mobile computing (WiCom)

作者： Fei Sun Huarui Yin Weidong Wang Department of Electrical Engineering and Information Science University of Science and Technology China

Time-of-arrival (TOA) estimator design for impulse radio ultra-wideband (IR-UWB) ranging demands high sampling rate high resolution ADC, which is difficult to implement. Some tradeoffs can be made such as limiting amplitude resolution. In this paper, we propose a two-step threshold selection TOA estimator using a two-bit ADC. the quantization threshold of ADC is set as the coarse threshold to distinguish between noise samples (NS) and signal samples (SS). Training-based Decision-Vector (DV) maximum likelihood (ML) estimation and the closed-form expression of early detection probability are presented. Based on early detection control, a simple but effective criteria to determine the fine threshold is proposed. the effects on the performance of training sequence length and coarse threshold, as well as fine threshold are simulated. It is also demonstrated that the proposed method is superior to conventional ED methods via simulation.

关键词： Noise Time of arrival estimation Receivers Training Estimation Quantization Simulation

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Mobile Sensor Approach to Location-Based Services

Mobile Sensor Approach to Location-Based Services

引用

international conference on Wireless Communications, Networking and Mobile computing (WiCom)

作者： Alex Aved Kien A. Hua Antoniya Petkova School of Electrical Engineering and Computer Science University of Central Florida Orlando FL USA

Moving object database is the core technology for location-based services (LBS), permitting users to pose spatial queries about the environment around them. We introduce a sensor-based LBS approach that is more economical and scalable for large-scale deployments supporting a large user community. We discuss this framework in the context of k-nearest-neighbor queries. We present simulation results and efficiency analysis to show the effectiveness of the proposed technique.

关键词： Servers Mobile communication Uncertainty Object recognition Robot sensing systems Query processing

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Adaptive signal management using event processing networks

Adaptive signal management using event processing networks

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作者： Velandia-Briñez, Cesar D. Don, S. Cho, Na-Yun Choi, Eunmi Min, Dugki School of Computer Science and Engineering Konkuk University Hwayang-dong Gwangjin-gu Seoul 133-701 Korea Republic of School of Business IT Kookmin University Jeongneung-dong Seongbuk-gu Seoul 136-792 Korea Republic of

ISBN: (纸本)9788988678251

Efficient traffic control systems are required in towns and cities around the world. As the number of vehicles increase, and new infrastructure is less viable;high levels of mobility become essential. this work proposes a strategy for Intelligent Transportation Systems (ITS), in particular for the task of adaptive signal management. this approach is based on Complex Event Processing (CEP). Event processing provides fast assessment of the situation, due to its inherent capabilities for pattern detection and information composition. this work proposes an architectural model based on the concept of event processing networks. Our model is specifically designed to derive events obtained from loop detectors and compose enhanced signal timings, representing accurately the requirements of the roadway for signal management.

关键词： Adaptive control systems

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Embedding self-awareness into objects of daily life - the smart kettle

Embedding self-awareness into objects of daily life - The sm...

引用

international conference on Intelligent Environments

作者： Baumgarten, Matthias Guldenring, Daniel Poland, Michael Nugent, Chris Hallberg, Josef School of Computing and Mathematics University of Ulster Shore Road Newtownabbey BT37 0QB United Kingdom Department of Computer Science and Electrical Engineering Luleå University of Technology Luleå Sweden

ISBN: (纸本)9780769541495

Intelligent Environments on varying scales and for different purposes are slowly becoming a reality. In the near future, global smart world infrastructures will become a commodity that will support various activities of daily life at different degrees of realism. Such infrastructures have the potential to offer dedicated, context- and situation-aware information and services by simultaneously providing the next-generation of data collection, execution and service provisioning layers. One key aspect of this vision is the correct monitoring and understanding of how people interact with their environment;how they can actually benefit from the added intelligence;and finally how future services can be improved or better personalized to enhance human environment interaction as a whole. this level of intelligence is of particular relevance in the health and social care domain where person-centric services can be deployed to assist or even enable a person in performing activities of daily living. this paper discusses the concept of embedded self-aware profiles for smart devices that can be used to gain a deeper contextual understanding of their use and also discusses the emergence of a general model of Ambient Intelligence that is based on the collective existence and behavior of such smart devices. Although generic in principle, the proposed concepts have been exemplified by a distinct use case, namely a smart kettle. © 2010 IEEE.

关键词： Ambient intelligence

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Schedulability and end-to-end latency in distributed ECU networks: Formal modeling and precise estimation

Schedulability and end-to-end latency in distributed ECU net...

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6th Embedded Systems Week 2010, ESWEEK 2010 - 10th ACM international conference on Compilers, Architecture and Synthesis for Embedded Systems, EMSOFT'10

作者： Rajeev, A.C. Mohalik, Swarup Dixit, Manoj G. Chokshi, Devesh B. Ramesh, S. General Motors Global Research and Development India Science Lab. Bangalore India Computer Engineering and Networks Lab ETH Zürich Zürich Switzerland

ISBN: (纸本)9781605589046

Embedded control systems in automobiles are typically implemented by a set of tasks deployed on multiple Electronic control Units (ECUs) communicating via one or more buses like CAN or FlexRay. In the case of safety-critical systems, there are hard real-time bounds on the (i) response times of tasks/messages, and (ii) end-to-end latencies of certain task/message chains. these depend on various factors like the number of tasks (and messages) involved in the processing (and communication) sequence, parameters of these tasks/messages, scheduling policies, communication protocols, clock drifts, etc. Moreover, since the data transfer among tasks/messages is typically via asynchronous buffers that are overwritable and sticky, multiple semantics are possible for end-to-end latency. Hence, precise estimation of response times and end-to-end latencies in embedded systems is a non-trivial problem. In this paper, we propose a model-checking based technique to compute worst-case response times and end-to-end latencies. We consider a distributed system made of preemptively scheduled tasks and non-preemptively scheduled messages. Given a chain in the system, we estimate two different end-to-end latencies -LIFO and LILO- which are important in automotive domain. From a system description, we automatically synthesize a formal model based on a discrete event simulation formalism called Calendar Automata. It is then model-checked to compute response times and end-to-end latencies. Our technique is more scalable than the existing formal methods based techniques. We have illustrated this technique on reasonably large case-studies from the automotive domain.

关键词： Model checking

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Design and Deployment of Bridge Structural Health Monitoring System Based on Wireless Sensor Network

Design and Deployment of Bridge Structural Health Monitoring...

引用

international conference on Wireless Communications, Networking and Mobile computing (WiCom)

作者： Zhuo Liu Bingwen Wang Wenjun Yang Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan China

Wireless sensor network (WSN)becomes a research hotspot of structural health monitoring(SHM) with the characteristics such as convenience for remote monitoring, good fault-tolerant ability, easiness of system maintenance ,etc. In this paper, a WSN for bridge SHM is designed and deployment on the ZhengDian viaduct in Wuhan. In this deployment, 20 wireless nodes are distributed over the main span, collecting the ambient vibrations at *** collected data agrees with theoretical models and previous studies of the bridge.

关键词： Wireless sensor networks Monitoring Base stations Bridges Vibrations Energy consumption Accelerometers

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Fast Covariance Matching Based on Genetic Algorithm

Fast Covariance Matching Based on Genetic Algorithm

引用

international conference on Wireless Communications, Networking and Mobile computing (WiCom)

作者： Xuguang Zhang Shuo Hu Limin Zhang Yuanhao Wu Key Laboratory of Industrial Computer Control Engineering of Hebei Province Institute of Electrical Engineering Yanshan University슠 Qinhuangdao China Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy and Sciences Changchun China

this paper proposes an effective framework to boost the efficiency of covariance matching. In this framework, covariance matrices are used to match object in complex environment by fusing multiple features. then, Genetic Algorithm (GA) is employed to improve the processing speed of covariance matching. To take advantage of the property of GA for the optimization in large search spaces to covariance matching, a fitness function is designed using the distances between the covariance matrices of model and candidate regions. Experimental results show that the proposed approach can improve the processing speed of covariance matching observably. the computing speed of the proposed method is at least 7 times than that of exhaustive searching.

关键词： Covariance matrix Gallium Feature extraction Pixel Robustness Genetic algorithms Computational modeling

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Analysis of Music Representations of Vocal Performance Based on Spectrogram

Analysis of Music Representations of Vocal Performance Based...

引用

international conference on Wireless Communications, Networking and Mobile computing (WiCom)

作者： Qing Chen Lihua Ai Weiying Wei Wenjun Ma Peipei Xie Ming Zhang School of Optical-Electrical & Computer Engineering University of Shanghai for Science and Technology Shanghai China

Spectrogram is a main analysis method of audio signals and other similar quasi - stationary ones and produces a time-frequency portrait of a signal. this paper researches correspondence between important time-frequency structures and music representations of vocal performance, aiming at providing quantitative analysis and objective information description of the subjective perception of specific voice techniques. Experiments and vocal music examples reveal and indicate that spectrogram is a powerful tool for aiding the study, comprehension, and interpretation of musical expression.

关键词： Spectrogram Time frequency analysis Multiple signal classification Music Fourier transforms Harmonic analysis

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Optimal method for growth in dynamic self organizing learning systems

Optimal method for growth in dynamic self organizing learnin...

引用

2010 6th IEEE World Congress on Computational Intelligence, WCCI 2010 - 2010 international Joint conference on Neural Networks, IJCNN 2010

作者： Yerramalla, Sampath Fuller, Edgar Cukic, Bojan Pratt and Whitney United States Department of Mathematics West Virginia University United States Lane Department of Computer Science and Electrical Engineering West Virginia University United States

ISBN: (纸本)9781424469178

Self-organization in learning systems refers to the ability of the system to adapt and respond data as it is presented without outside intervention. the ability to self-organize is desirable and is critical in realizing on-line and real-time adaptive systems for applications including control systems, navigation, vision, and speech. In this paper, we focus on self-organizing learning systems which utilize the addition and subtraction of receptor nodes or neurons in some way. Typically, these algorithms store error information and use it to modify the neural network dynamically so that this error will be decreased. Examples of these learning systems include self-organizing maps, growing cell structures, and dynamic cell structures. We describe current methods for growing the number nodes in the case of the Dynamic Cell Structures neural network and discuss issues via examples that could lead to potentially incorrect data representation during the implementation of the algorithm. A new algorithm is provided that overcomes the observed flaw and enables these learning systems to grow and operate in an optimal and robust manner. the analysis of the proposed optimal growing algorithm indicates that this modified algorithm is more reliable for use in on-line and real-time adaptive systems. © 2010 IEEE.

关键词： Learning systems

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Development of Simulation Software and control System for Mechanism with Hybrid Kinematic Structure

Development of Simulation Software and Control System for Me...

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ISR 2010 (41st international Symposium on Robotics) and ROBOTIK 2010 (6th German conference on Robotics)

作者： Viera Poppeova Juraj Uri?ek Vladimir Bulej Peter Šindler University of Žilina Faculty of Mechanical Engineering Department of Automation and Production Systems Univerzitná 1 010 26 Slovakia University of Žilina Faculty of Electrical Engineering Department of Mechatronics and Electronics Slovakia

this paper describes the design of simulation software and control system for mechanism with hybrid kinematic structure (HKS) called trivariant which were realized on the workplace of authors. Designed simulation software allows the movement simulation of HKS as a machine tool with five degrees of freedom (DOF) or as a robot with six DOF. Both modifications can be simulated in manual or in automatic mode too. For the calculation of joint coordinates was necessary to create the mathematical model of mechanism. Simulation software was designed in programming language Delphi with support of OpenGL library. the control system for trivariant is based on standard PC which is connected to the mechanism by communication module. For practical functional verification of simulation SW and control system was built a real prototype.

关键词： Kinematics control systems Joints Software Mathematical model Driver circuits Leg

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