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检索条件"任意字段=Conference on Next-Generation Communication and Sensor Networks 2007"

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Effect of co-existence interferences on QoS of HSPA/WCDMA mobile networks

Effect of co-existence interferences on QoS of HSPA/WCDMA mo...

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International conference on Radioelektronika

作者： Lukas Klozar Ladislav Polak Ondrej Kaller Jan Prokopec Department of Radio Electronics Sensor Information and Communication Systems Research Center Brno University of Technology Brno Czech Republic

The rising density of wireless networks and the related rising number of user equipment increase the vulnerability of interference generation. These interfering signals could be generated as the result of the co-existence of wireless standards like DVB-T, LTE, WCDMA, WiMAX, GSM, Wi-Fi and other services transmitted in adjacent bands of the radio spectrum. The received signals are mixed with the higher order modulation products on the nonlinearity of amplifier. next, the generated interfering signals are radiated back to the radio environment. With sufficient power the mixed signals could overlay an inter or intra system channel and thus interfere useful signals of surrounding transmissions. This paper introduces the influence of interfering signals on transmission parameters in the 3G HSPA mobile network. Our measurement is carried out in a real 3G UMTS network using HSPA user equipment. The bandwidth of interfering signals is chosen in compliance with the possible scenarios generating higher order modulation products and also the possible scenario of cognitive radio applications. The workplace, theoretical background and the measurement principles of the performed method are introduced and briefly described. The impact of bandwidth and power of the interfering signals on the quality of services in the mobile network is represented as the change of CQI, data rates, the number of allocated channelization codes in downlink shared channel and also the increase of signaling and data traffic required for repeated transmission of the corrupted signal. The obtained results are evaluated and described.

关键词： Bandwidth Multiaccess communication Spread spectrum communication Mobile communication Interference Downlink Wireless communication

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Introduction to the alliance for wireless power loosely-coupled wireless power transfer system specification version 1.0

Introduction to the alliance for wireless power loosely-coup...

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IEEE Wireless Power Transfer conference (WPTC)

作者： Ryan Tseng Bill von Novak Sumukh Shevde Kamil A. Grajski Qualcomm Technologies Incorporated San Diego CA USA

The Alliance for Wireless Power (A4WP) Version 1.0 Baseline System Specification (BSS) is an interoperability specification for loosely-coupled (LC) wireless power transfer (WPT) systems that meet next-generation user experience and industrial design requirements as part of the vision of Ubiquitous Power for portable, hand-held, consumer electronic devices. This survey of the A4WP Version 1.0 BSS reviews an LC WPT reference model, power transmitting and power receiving unit device classification, power system interfaces and key parameters, the power control specification, the signaling specification, and the framework for certification and acceptance testing based on reference power transmitting and power receiving resonators. The selection of ISM band (6.78MHz) as the WPT operating frequency and ISM band (2.4GHz) for WPT management protocol via BluetoothLE is discussed.

关键词： Wireless communication Wireless sensor networks Protocols Interoperability Magnetic resonance Bluetooth

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Combined contention and TDMA-based communication in wireless sensor networks

Combined contention and TDMA-based communication in wireless...

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8th EURO-NF conference on next generation Internet, NGI 2012

作者： Casares-Giner, Vicente Wüchner, Patrick Pacheco-Paramo, Diego De Meer, Hermann Universitat Politècnica de València Spain Department of Informatics and Mathematics University of Passau Germany

ISBN: (纸本)9781467316347

Wireless sensor networks usually consist of a large number of very small, energy-constrained sensor nodes. The nodes capture information from their immediate environment to send it to a destination node (sink) in a timely manner. This work proposes a combined contention and TDMA-based approach for load balancing and a discrete-time Markov model that allows to study the trade-off between energy consumption and transfer delay in clustered wireless sensor networks. Our investigations show that the length of the TDMA frame needs to be configured close to the minimum that is capable of transferring the offered load for optimizing energy efficiency and minimizing the delay. © 2012 IEEE.

关键词： Queueing theory

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8th EURO-NF conference on next generation Internet, NGI 2012 - Proceedings

8th EURO-NF Conference on Next Generation Internet, NGI 2012...

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8th EURO-NF conference on next generation Internet, NGI 2012

ISBN: (纸本)9781467316347

The proceedings contain 20 papers. The topics discussed include: combined contention and TDMA-based communication in wireless sensor networks;outage probability, average transmission time, and quality of experience for cognitive radio networks over general fading channels;cognitive radio networks with elastic traffic;optimal intercell coordination for multiple user classes with elastic traffic;flow-level modeling and analysis of dynamic TDD in LTE;cognitive radio spectrum decision based on channel usage prediction;beacon-enabled cognitive access for dynamic spectrum access;pricing and regulating quality of experience;content dependency of the traffic control in the Darwin streaming server;a wireless sensor and actuator network for improving the electrical power grid dependability;real-time multimedia monitoring in large-scale wireless multimedia sensor networks: research challenges;and reliable multicast on a WDM optical packet ring.

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Implementation Perspectives of Wireless sensor and Actuator networks in Smart Grid

Implementation Perspectives of Wireless Sensor and Actuator ...

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International conference on Materials Science and Information Technology (MSIT 2011)

作者： Veleva, Sanja Davcev, Danco Univ Ss Cyril & Methodius Fac Elect Engn & IT Skopje Macedonia

ISBN: (纸本)9783037853191

Today's scarcity of power generation and complex distribution through the electric power systems can not address the trend of increasing demand and consumption of electricity. The monitoring and control of the electric power systems through wired communications require expenses in material, staff, and usually fail in the effective communication for fault diagnostic and protection. In this article we discuss the possibility for the Wireless sensors and Actuators to address this challenge and provide an optimization of the management for the electric power systems. By embedding the positive influence over the three major power systems: power generation, power delivery, and power utilization, Wireless sensor and Actuator networks (WSANs) emerge as an enhancing technology for the next generation of electric power systems, Smart Grids. In this paper, we present an overview of the functionalities of the WSANs in Smart Grids, their advantages over traditional networks, and their architectural characteristics in a way of supervision and control of the power system, by improving the balance between the power supply and demand, and therefore avoiding energy shortages.

关键词： wireless sensor and actuators smart grid smart sensor data acquisition energy management

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Semi-Definite Programming Based Pulse Shaping Algorithm in IEEE 802.15.4a

Semi-Definite Programming Based Pulse Shaping Algorithm in I...

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2nd International conference on Instrumentation and Measurement, Computer, communication and Control (IMCCC)

作者： Wu Xuan-li Sun Lu-kuan Feng Wei Luo Ming-xin Harbin Inst Technol Sch Elect & Informat Engn Harbin 150006 Peoples R China ZTE Corp Shenzhen Peoples R China

ISBN: (纸本)9780769549354

In order to increase the peak transmission data rate of Zigbee and expand its application scenario, IEEE 802.15.4a standard has been proposed in 2007, and ultra-wideband (UWB) technique has been selected as one of its physical layer standard. The performance of wireless sensor networks (WSN) will be affected by the pulse waveform transmitted in the channel, hence, in this paper, the Chinese regulation for UWB devices is firstly given, and then, a semi-definite programming based pulse shaping algorithm to comply with such regulation is proposed. Simulation results show that the proposed algorithm can comply with the given regulation with high power efficiency, which can increase the signal to noise ratio (SNR) in the receiver end.

关键词： ultra-wideband wireless sensor network pulse shaping Chinese regulation semi-definite programming

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A Fault Tolerance Approach to Topology Control in Distributed sensor networks

A Fault Tolerance Approach to Topology Control in Distribute...

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IEEE International conference on Advanced communication Control and Computing Technologies (ICACCCT)

作者： Bhajantri, Lokesh B. Nalini, N. Basaveshwar Engn Coll Dept Comp Sci & Engn Bagalkot Karnataka India NMIT Dept Informat Sci & Engn Bangalore Karnataka India

ISBN: (纸本)9781467320467

A Distributed sensor Network (DSN) that can provide access to information anytime, anywhere by collecting, processing, analyzing and disseminating data. Thus, the network actively participates in creating a smart environment. Distributed sensor networks promise to revolutionize sensing in a wide range of application domains. This is because of their reliability, accuracy, flexibility, cost effectiveness and ease of deployment of nodes in topology of DSN. Smart sensors can offer vigilant surveillance and can detect and collect data concerning any sign of machines failure, earthquakes, floods and even a terrorist attack energy efficiency, topology control and fault-tolerance are the most important issues in the development of next-generation DSN. Fault tolerance is the ability of a system to deliver a desired level of functionality in presence of faults in the topology. Topology control as a low level service governs communication among all nodes and is hence the primary target for increasing connectivity and saving energy. In this work, we have proposed two models for fault detection and fault recovery to achieve fault tolerance in topology. The proposed fault detection model is used to detect faults at node level (checking node's energy) and network level faults (link failure and packet error). The proposed fault recovery model is used to achieve fault tolerance by adjusting the topology of the randomly deployed sensor nodes. Finally, we have evaluated the performance parameters for the proposed scheme.

关键词： Fault tolerance topology control fault detection fault recovery Routing and Distributed sensor networks (DSN's)

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Wireless sensor networks for In-Home Healthcare: Issues, Trend and Prospect

Wireless Sensor Networks for In-Home Healthcare: Issues, Tre...

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International conference on Computer Science and Network Technology (ICCSNT)

作者： Zhao Wei Ning Shangpin Liu Lu Chinese Acad Sci Shenyang Inst Automat Ind Informat Dept Shenyang Peoples R China Beijing HangXing Technol Co Ltd Beijing Peoples R China Shenyang Jianzhu Univ Shenyang Peoples R China

ISBN: (纸本)9781457715846

As the world's population ages, those suffering from diseases of the elderly will increase. The health care expenditures will increase rapidly and become non-affordable for the governments around the world. New technology and new model for patient healthcare must be found to relieve the pressure of finance and society. In-home pervasive networks may assist residents by providing memory enhancement, control of home appliances, medical data lookup, and emergency communication. Cooperation between wireless sensor networks and existing consumer electronic infrastructures can assist in the areas of health care and patient monitoring. This will improve the quality of life of patients, provide early detection for certain ailments, and improve doctor-patient efficiency. In this paper we detail some basal concepts of wireless sensor network first. The possible security issues, privacy issues and legal issues are argued at the second part. The prospect and function of next generation smart homecare based on wireless senor network will be shown at the last part.

关键词： Wireless sensor network medical issues prospect

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Wireless sensor network in home automation network and smart grid

Wireless sensor network in home automation network and smart...

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1st International conference on Complex Systems, ICCS 2012

作者： Brak, M. El Essaaidi, M. Information Systems and Telecommunications Laboratory Abdelmalek Essaadi University Faculty of Science and Technology Tangier Morocco Information Systems and Telecommunications Laboratory Abdelmalek Essaadi University Faculty of Science Tetouan Morocco

ISBN: (纸本)9781467347662

The collaborative and low-cost nature of wireless sensor networks (WSNs) brings significant advantages over traditional communication technologies used in today's electric power systems. Recently, WSNs have been widely recognized as a promising technology that can enhance various aspects of today's electric power systems, including generation, delivery, and utilization, making them a vital component of the next-generation electric power system, the smart grid. However, harsh and complex electric-power-system environments pose great challenges in the reliability of WSN communications in smart grid applications. This paper starts with an overview of the application of WSNs for electric power systems along with their opportunities and challenges and opens up future work in many unexploited research areas in diverse smart-grid applications. © 2012 IEEE.

关键词： Wireless sensor networks

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Channel characterization and throughput tradeoff for wireless sensor networks

Channel characterization and throughput tradeoff for wireles...

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2012 IEEE Military communications conference, MILCOM 2012

作者： Lightfoot, Leonard E. Laubie, Ellen Air Force Research Laboratory Wright-Patterson Air Force Base Dayton OH 45433 United States

ISBN: (纸本)9781467317290

With the growing number of wireless network standards operating in the unlicensed frequency band and the military moving toward commercial off the shelf technology, the next generation of wireless sensor networks must be robust against unintentional and hostile interference. One method that has gained interest to cope with the increased spectrum use and to combat the interference vulnerability in wireless sensor networks is frequency agile communication. These techniques typically entail spectrum sensing and dynamic frequency channel allocation. In this paper, the energy detection mechanism is used to investigate how the number of frequency channels characterized for spectrum sensing impacts the accuracy of frequency channel selection and how the number of channels characterized affects the achievable throughput. From the investigation, we observed a tradeoff between the number of channels characterized, the number of energy samples used in energy detection, and the achievable throughput. © 2012 IEEE.

关键词： Throughput

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