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High-Speed Wireless Infrared Links with an Adaptive Multibeam Clustering Method and Angle Diversity Detection

High-Speed Wireless Infrared Links with an Adaptive Multibea...

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14th international conference on Transparent Optical networks (ICTON)

作者： Alresheedi, Mohammed T. Elmirghani, Jaafar M. H. Univ Leeds Sch Elect & Elect Engn Leeds LS2 9JT W Yorkshire England

ISBN: (纸本)9781467322270

In this paper, we propose a mobile optical wireless (OW) system that employs a beam delay and a power adaptation multibeam clustering method in conjunction with an angle diversity receiver (BDPA-BCM). Our ultimate goal is to improve the signal to noise ratio (SNR), reduce the delay spread and increase the received optical power under multipath dispersion, background noise and mobility. A significant reduction in delay spread by nearly a factor of fifteen and an enhanced SNR by almost 10 dB over a line strip multibeam system (LSMS) can be achieved when a beam delay and power adaptation line strip multibeam system (BDPA-LSMS) coupled with an angle diversity receiver is employed. At a bit rate of 50 Mbit/s, the proposed BDPA-BCM offers about a 10 dB SNR gain over a BDPA-LSMS. A further improvement in the delay spread of the BDPA-BCM by a factor of eight compared with the BDPA-LSMS is achieved. the improvements in the delay spread and the SNR enable the BDPA-BCM to operate at higher data rates of 2.5 Gb/s and 5 Gb/s. Our simulation results show that the modified BDPA-BCM at a bit rate of 5 Gb/s achieves about 16 dB SNR for the worst communication path under the presence of background noise and mobility while achieving a BER below 10(-9).

关键词： gigabit mobile optical wireless systems beam delay and beam power adaptation beam clustering diversity detection

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Effective Quality-of-Service Policy for Capacity High-Performance Computing systems

Effective Quality-of-Service Policy for Capacity High-Perfor...

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14th IEEE international conference on High Performance Computing and communications (HPCC) / IEEE 9th international conference on Embedded Software and systems (ICESS)

作者： Jokanovic, Ana Carlos Sancho, Jose Labarta, Jesus Rodriguez, German Minkenberg, Cyriel Barcelona Supercomp Ctr Barcelona Spain IBM Zurich GmbH Zurich Switzerland

ISBN: (纸本)9780769547497

Current high-performance capacity systems run hundreds of applications concurrently sharing the same network resources. In this scenario, system throughput and hence system utilization is significantly affected by inter-application contention. Quality-of-service (QoS) mechanisms are traditionally used in the Internet to provide different levels of performance guarantees. However, we have not found in the literature the application of QoS techniques to reduce the impact of inter-application contention on contention-sensitive applications running in capacity high-performance computing (HPC) clusters. Only a small set of applications can benefit from the policies currently used. Applications are basically classified into two classes, namely latency-sensitive and bandwidth-sensitive applications. Instead, we propose a more efficient quality-of-service policy for HPC systems with InfiniBand network. this technique provides a wider classification of applications, and hence can leverage QoS mechanisms for a large number of applications resulting in an increase of system performance. the proposed QoS policy provides a method to effectively map applications to virtual lanes and applies effective bandwidth distribution for each of the lanes. Results obtained for slimmed fat-tree networks show that by segregating applications on virtual lanes a substantial reduction of inter-application contention by 59% can be achieved for typical scientific codes. Also, applications can be effectively grouped into one virtual lane based on a network utilization metric in case there are more applications than virtual lanes in the system. Moreover, further improvements are obtained by allocating a different bandwidth to each virtual lane. this technique will favor some applications without significantly degrading the others. We show that for HPC, contrary to Internet, QoS policies should favor applications that are less communication demanding.

关键词： Inter-application contention Network contention InfiniBand interconnect Quality of service

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On the role of wireless sensor networks in intelligent transportation systems

On the role of wireless sensor networks in intelligent trans...

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14th international conference on Transparent Optical networks, ICTON 2012

作者： Losilla, Fernando Garcia-Sanchez, Antonio Javier Garcia-Sanchez, Felipe Garcia-Haro, Joan Universidad Politécnica de Cartagena Spain

ISBN: (纸本)9781467322270

Currently Vehicular Ad-hoc networks (VANET) are receiving great attention by researchers because of their potentiality for developing innovative applications in the Intelligent Transportation systems (ITS) context and are expected to be a widely adopted technology in the medium/long term. However, for the near future, the adoption of this technology is difficult since its performance relies excessively on its penetration rate into vehicles. In addition VANET are only able to gather information about the road while vehicles equipped with the appropriate technology are nearby, otherwise information can only be obtained by expensive and therefore scarcely deployed Roadside Units (RSU). Wireless Sensor networks (WSN), on the contrary, can be deployed along a road (or in a parking lot area) with very little installation and maintenance costs. they can be used to constantly acquire information related to the road condition and the traffic state and, in addition, execute collaborative in-road processing for safety purposes. these properties make WSN an effective complement to VANET, since they can cooperate with them in order to mitigate their limitations. On the other hand, WSN deployments can also benefit from VANET and other communication technologies such as cellular networks in order to disseminate the information gathered to distant places. Consequently, WSN can also play a major role in ITS. © 2012 IEEE.

关键词： Vehicular ad hoc networks

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Analysis on the Reliability of Wide Area Protection communication System

Analysis on the Reliability of Wide Area Protection Communic...

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14th IEEE international conference on communication Technology (ICCT)

作者： Yu Hai Yu Yue Yao Qigui Yin Haiqing Southeast Univ Sch Elect Engn Nanjing 210000 Jiangsu Peoples R China China Elect Power Res Inst Res Inst Informat & Commun Technol Nanjing 210000 Jiangsu Peoples R China

ISBN: (纸本)9781467321013;9781467321006

this paper analyzes characteristics of the wide area protect communication system structure, and divides communication systems into the system protection center, backbone network, and regional communications systems. And regional communication system is divided into regional protection centers, regional networks and sub-station system. then this paper analyzes the reliability of the fiber optic ring network which is used widely, and establishes the reliability model of each subsystem. As IEEEl4 bus for example, we calculate the reliability of each subsystems and overall system, then we get the sub-station is a bottleneck affecting the reliability of the entire communication system. But in wide area network, ATM switches are weakest link components. We use Bayesian network as reliability evaluation method. the reliability evaluation method of Bayesian network not only can be easily used to calculate the reliability, but also can find the thin section of system by its unique reverse reasoning technique. High-reliability Wide-area protection communication system is an important part of wide area protection system for its correct and reliable operation.

关键词： wide area protection communication system WAPS reliability model reliability assessment Bayesian networks

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Comparison of SOC estimation performance with different training functions using neural network

Comparison of SOC estimation performance with different trai...

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2012 14th international conference on Modelling and Simulation, UKSim 2012

作者： Jian, Wei Jiang, Xuehuan Zhang, Jinliang Xiang, Zhengtao Jian, Yubing School of Electrical and Information Engineering Hubei University of Automotive Technology Shiyan China School of Management Shanghai University Shanghai China Electronic and Communication Engineering Bristol University Bristol United Kingdom

ISBN: (纸本)9780769546827

the estimation of State Of Charge (SOC) of battery pack attracts wide attention in battery manufacture and application, which is a key issue in Battery Management System (BMS). A practical three-layer BP neural network is proposed and used to estimate the SOC of LiFePO4 lithium-ion battery pack, which consists of three series groups with each group of 8 series modules. Sample data are obtained with different discharging scenarios to train the network with different training functions. And the trained neural networks are used to estimate the SOC. Results of experiments show that the performances of neural networks trained by different training functions differ in estimation accuracy and training speed. the Levenberg-Marquardt (L-M) algorithm achieves the best performance compared with the other two algorithms. © 2012 IEEE.

关键词： Battery management systems

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Proceedings of 2012 IEEE 14th international conference on communication Technology, ICCT 2012

Proceedings of 2012 IEEE 14th International Conference on Co...

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2012 IEEE 14th international conference on communication Technology, ICCT 2012

ISBN: (纸本)9781467321013

the proceedings contain 256 papers. the topics discussed include: A novel two-stage entropy-based spectrum sensing scheme in cognitive radio;an improved certificate-less authenticated key agreement protocol;a novel MIMO channel model for high speed railway system;a novel scheduling scheme for finite buffer service in time-varying channels;a VANET-oriented routing protocol for intelligent taxi-call systems;video quality assessment and QOE-driven adjustment scheme in wireless networks;improving routing protocols of WSN in WHSN;analysis of energy detection over double-Rayleigh fading channel;interference alignment for overlay cognitive radio based on game theory;random user selection method for LPI in multiuser MISO-OFDMA system;and HPAP: high precision active probe for path roundtrip delay measurement.

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Error rate analysis and co-operative communication for ad-hoc and sensor network to combat Rician fading based on disaster healthcare

Error rate analysis and co-operative communication for ad-ho...

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2012 IEEE 14th international conference on e-Health Networking, Applications and Services, Healthcom 2012

作者： Ibrahim, Salah Kang, Guixia Ministry of Education Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781457720390

Possessing dependable communications throughout large-scale disaster circumstances is of principal significance in today's world. Especially, propagation of vital information to the survivors and the rescue groups is an essential part of crisis communications. Given that the normal communication channels generally turn into non-functional in large-scale disasters, a provisional communication is required. thus, relay networks are proper for such situations where forward stations can be suitably situated within the disaster district to increase the coverage of the stations and enhance communication dependability. Recently, the performance analysis of the wireless communication systems that deteriorated by fading, and noise has received great attention. We propose square quadrature amplitude modulation (S-QAM) for consumed power enhancement and Cooperative communication for Ad hoc and sensor networks (WASN) to combat Rician fading. the proposed modulation technique in co-operative communication situation is evaluated by an analytical approach and simulations. the performance analysis with different Rician k-factor and diversity order with Matlab simulation is done. We observe bit error rate gain performance, in which there is a considerable gain in performance accomplished by increasing diversity order L, while the gain in performance that achieved by the increase in k is extremely small without diversity order. We conclude that using of cooperating communication can enhance the Rician fading in disaster situation and helps to save human lives. © 2012 IEEE.

关键词： Quadrature amplitude modulation

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Interference cancellation using iterative equalization for communication networks

Interference cancellation using iterative equalization for c...

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2012 14th international conference on Modelling and Simulation, UKSim 2012

作者： Oletu, Grace Rapajic, Predrag Anang, Kwashie Wu, Ruiheng Department of Computer and Communication Systems Medway School of Engineering University of Greenwich United Kingdom

ISBN: (纸本)9780769546827

Inter symbol interference (ISI) constitutes a major impediment to reliable communications in multipath channels. We proposed a low complexity soft feedback Interference canceller (SFEIC) that combines the equalizer outputs and a priori information to form more reliable estimates and perform successive interference cancellation. the receiver performs soft output decisions, achieved by a soft-input soft-output (SISO) detector and a SISO channel decoders, through an iterative process. Simulation results are presented showing that the proposed SFEIC BER perform well compared with MAP equalizer and outperform the conventional MMSE decision feedback equalizer. the results are presented for rate 1/2 turbo codes with Quadrature-phase shift keying (QPSK) modulation, transmitted over inter symbol interference (ISI) channel having severe frequency distortion. the performance is about 0.8dB gain over MMSE DFE equalizer at bit-error rate of 10-5. © 2012 IEEE.

关键词： Decision feedback equalizers

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Verification of ad hoc networks with node and communication failures

Verification of ad hoc networks with node and communication ...

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14th IFIP international conference on Formal Methods for Open Object-Based Distributed systems, FMOODS 2012 and the 32nd IFIP international conference on Formal Techniques for Networked and Distributed systems, FORTE 2012

作者： Delzanno, Giorgio Sangnier, Arnaud Zavattaro, Gianluigi University of Genova Italy LIAFA Univ. Paris Diderot CNRS France University of Bologna INRIA - FOCUS Research Team Italy

ISBN: (纸本)9783642307928

We investigate the impact of node and communication failures on the decidability and complexity of parametric verification of a formal model of ad hoc networks. We start by considering three possible types of node failures: intermittence, restart, and crash. then we move to three cases of communication failures: nondeterministic message loss, message loss due to conflicting emissions, and detectable conflicts. Interestingly, we prove that the considered decision problem (reachability of a control state) is decidable for node intermittence and message loss (either nondeterministic or due to conflicts) while it turns out to be undecidable for node restart/crash, and conflict detection. © 2012 IFIP international Federation for Information Processing.

关键词： Computability and decidability

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the effect of defocus blur on a spatial OFDM optical wireless communication system

The effect of defocus blur on a spatial OFDM optical wireles...

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14th international conference on Transparent Optical networks, ICTON 2012

作者： Rubaiyat Hossain, Mondal M. Armstrong, Jean Department of Electrical and Computer Systems Engineering Monash University Australia

ISBN: (纸本)9781467322270

Imperfect focusing of the receiver can be an important impairment in MIMO optical wireless systems using imaging receivers. this paper investigates the effect of defocus blur on an optical wireless system using spatial orthogonal frequency division multiplexing (OFDM). It is shown that when defocus blur is the only impairment, and when transmitter and receiver are perfectly aligned, the defocus blur causes the received constellation points to be attenuated. Simulation results show that the signal-to-noise ratio (SNR) penalty caused by defocus blur is less for a system using spatial asymmetrically clipped optical OFDM than for one using spatial DC biased optical OFDM. © 2012 IEEE.

关键词： Orthogonal frequency division multiplexing

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