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Intelligent Bandwidth Management Using Fast Learning Neural networks

Intelligent Bandwidth Management Using Fast Learning Neural ...

引用

IEEE international conference on High Performance Computing and communications (HPCC)

作者： Fahad Ullah Gul M. Khan Sahibzada Ali Mahmud Department of Computer Systems Engineering University of Engineering and Technology Peshawar Pakistan Department of Electrical Engineering University of Engineering and Technology Peshawar Pakistan

A fast learning neural network based scheduling system is presented to predict the frames on a single and multi-user MPEG-4 traffic and to distribute the bandwidth accordingly. MPEG-4 video stream traffic from various sources is used to evaluate the capability of this algorithm. A Fast learning Neural network algorithm also termed as Cartesian Genetic Programming Evolved Artificial Neural Network (CGPANN) is used as a forecaster to predict the size of the next frame based on the historical data consisting of previous 10 frames in the buffer for each individual user. A range of scenarios are exploited and analyzed for the frame size prediction error, bandwidth utilization efficiency and the frame drop rate for the whole system as well as every user involved obtaining outstanding results. For the best case, the system - with 50 users using the streaming service - has 35% of bandwidth efficiency with very low frame drop frequency.

关键词： Bandwidth Streaming media Transform coding Prediction algorithms Estimation Artificial neural networks Multimedia communication

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Two-tier Cellular networks with Frequency Selective Surface

Two-tier Cellular Networks with Frequency Selective Surface

引用

IEEE international conference on High Performance Computing and communications (HPCC)

作者： Siyi Wang Weisi Guo Tim OFarrell Department of Electronic and Electrical Engineering The University of Sheffield Sheffield United Kingdom

A key challenge is how to improve the wireless capacity of cellular networks for both outdoor and indoor users. Whilst deploying low power femtocells can significantly improve the indoor capacity, its interference can erode the outdoor capacity. In order to maximise the performance of the co-frequency two-tier network, the research challenge is how to minimise their mutual interference through coordination and other methods. this paper proposes a controllable interface that acts as a dynamic barrier between the outdoor and indoor networks. the interfaces comprises of a frequency-selective-surface (FSS) which is a band-stop filter. the paper also demonstrates that without any FSS interfaces, the mutual interference between indoor and outdoor networks erodes the capacity of each other significantly. the benefit of the FSS interface is that it is able to mitigate the mutual interference to the extent that their capacities are maximised. the results show that by deploying FSS interfaces, an improvement of up to 1.3 fold in mean throughput, 4.6 fold in throughput fairness for outdoor users and 1.2 fold in mean throughput, 2 fold in throughput fairness for indoor users can be achieved. the analysis is conducted using both a theoretical stochastic geometry analysis and multi-cell simulation results.

关键词： Frequency selective surfaces Interference throughput Femtocells Indexes Mobile communication Data models

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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...

引用

international conference on Transparent Optical networks

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

ISBN: (纸本)9781467322287

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.

关键词： Optical transmitters OFDM Optical imaging Optical receivers Integrated optics Optical attenuators

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Sensor Placement with Multiple Objectives for Structural Health Monitoring in WSNs

Sensor Placement with Multiple Objectives for Structural Hea...

引用

IEEE international conference on High Performance Computing and communications (HPCC)

作者： Md Zakirul Alam Bhuiyan Guojun Wang Jiannong Cao Hong Kong Polytechnic University Kowloon Hong Kong China School of Information Science and Engineering Central South University Changsha China Department of Computing Hong Kong Polytechnic University Kowloon Hong Kong China

Sensor placement plays a vital role in deploying wireless sensor networks (WSNs) for structural health monitoring (SHM) efficiently and effectively. Existing civil engineering approaches do not seriously consider WSN constraints, such as communication load, network connectivity, and fault tolerance. In this paper, we study the methodology of sensor placement optimization for SHM that addresses three key aspects: finding a high quality placement of a set of sensors that satisfies civil engineering requirements; ensuring the communication efficiency and low complexity for sensor placement; and reducing the probability of a network failure. Particularly, after the placement of a subset of sensors, we find some distance-sensitive, but unused, near optimal locations for the remaining sensors to achieve a communication-efficient WSN. By means of the placement, we present a "connectivity tree" by which structural health state or network maintenance can be achieved in a decentralized manner. We then optimize the system performance by considering multiple objectives: lifetime prolongation, low communication cost, and fault tolerance. We validate the efficiency and effectiveness of this approach through extensive simulations and a proof-ofconcept implementation on a real physical structure.

关键词： Wireless sensor networks Monitoring Fault tolerance Fault tolerant systems Complexity theory Shape Numerical models

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Evaluation of cellular networks in Underwater acoustic communication

Evaluation of cellular networks in Underwater acoustic commu...

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international conference on Advanced communication Technology (ICACT)

作者： Amirmansour Nabavinejad Samar Shahabi Ghahfarokhi Department of Electrical Engineering Islamic Azad University Isfahan Iran Department of Electrical Engineering and Information Technology Ilmenau University of Technology Ilmenau Germany

the characteristics of acoustic propagation through the underwater environment are the greatest challenges faced by Underwater acoustic communications systems. Limit bandwidth in these systems is of paramount obstacles. To overcome this problem the idea of frequency reuse pattern seems to be useful. the key characteristic of a cellular network is the ability to re-use frequencies to increase both coverage and capacity. One element that determines frequency reuse is the reuse distance depending on the cell radius and the number of cells per cluster. Analysis of frequency reuse between adjacent clusters and optimal cell-radius selection criteria has been carried out recently. In other recent woks, the parameters of the cellular networks designing have been calculated based on a rough approximation of the attenuation and propagation model. In our work, after driving the ratio of signal to interference for underwater acoustic channels with more accuracy, the constraints for the cell radius are determined. One of the most important results of this contribution is that, for special parameters like bandwidth, it may be impossible to provide the required signal to interference ratio and bandwidth for the network users. Furthermore, in this paper, the number of supportable users, per-user bandwidth, and the user capacity for a cellular underwater network are determined.

关键词： Bandwidth Underwater acoustics Land mobile radio cellular systems Interference Wireless sensor networks Absorption

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Effects of aperture averaging and beam width on Gaussian free space optical links in the presence of atmospheric turbulence and pointing error

Effects of aperture averaging and beam width on Gaussian fre...

引用

international conference on Transparent Optical networks

作者： It Ee Lee Zabih Ghassemlooy Wai Pang Ng Northumbria University Newcastle Upon Tyne UK

ISBN: (纸本)9781467322287

this paper investigates the performance of free-space optical (FSO) communication systems under the influence of atmospheric loss, turbulence and pointing error. Considering the limiting Rytov-based scintillation theory associated with the simplified field models, the Gaussian-beam wave model is introduced to characterize the propagation properties of the optical signal through random turbulent medium. the bit-error rate (BER) and average channel capacity are evaluated, taking into account the effects of aperture averaging and beam width. In general, larger receiving apertures enable lower BER attainment with smaller signal-to-noise ratio (SNR), while beam width optimization is a feasible approach in promoting capacity enhancement.

关键词： Bit error rate Laser beams Channel capacity Apertures Optical fiber communication Adaptive optics Signal to noise ratio

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A method on reducing processing time using signature matching in a router

A method on reducing processing time using signature matchin...

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international conference on Advanced communication Technology (ICACT)

作者： Min Woo Kim Won Seok Choi Dong Geun Yun Jong Min Lee Seong Gon Choi College of Electrical & Computer Engineering Chungbuk National University Cheongju Chungbuk South Korea Institute of Network Technology Broadband Technology Laboratory SK Telecom Seongam Gyeonggi South Korea

this paper proposes a method on reducing processing time of the incoming packets using the signature matching in a router. According to the proposed method, the router has enhanced processing time using signature matching of necessary portion and referring of pre-investigated packet routing table. As a result, this method provides improved quality for real-time traffic such as VoIP and video streaming/conferencing.

关键词： Delay Real time systems IP networks Routing protocols Internet Monitoring

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An analysis of intra-vehicle optical wireless communications from a passenger perspective

An analysis of intra-vehicle optical wireless communications...

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international conference on Transparent Optical networks

作者： Matthew D. Higgins Mark S. Leeson Roger J. Green School of Engineering University of Warwick Coventry UK

ISBN: (纸本)9781467322287

In this paper, the first results to show the power, bandwidth and RMS delay spread of an intra-vehicle optical wireless communication system from a passenger perspective are presented. this work builds upon a previous investigation of ours which had demonstrated potential for optical wireless deployment within a vehicle as a potential competitor to RF based systems. By now incorporating the presence of passengers into our system and along with some slight updates to the vehicles dimensions, we further show the viability of optical wireless for this application. In particular, it is shown that locations around the passengers arms and legs can be provided with an infrared signal large enough, and with enough bandwidth, to host high speed, reliable wireless communications.

关键词： Wireless communication Bandwidth Vehicles Integrated optics Optical transmitters Delay High speed optical techniques

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Millimeter-wave photonic techniques for radio-over-fiber systems

Millimeter-wave photonic techniques for radio-over-fiber sys...

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international conference on Advanced communication Technology (ICACT)

作者： Wei-Hsueh Wen Jia Liu Wen-Piao Lin Guangmin Sun Department of Electrical Engineering Chang Gung University Taiwan Institute of Electronic Information and Control Engineering Beijing University of Technology China

We proposed a 60 GHz multiband-orthogonal frequency-division-multiplexing (MB-OFDM) system using millimeter-wave (MMW) photonic techniques. A simple optical modulation scheme is developed to generate 60 GHz carrier by the sixth-harmonic term of local oscillator (LO) frequency. We have experimentally demonstrated that the wireless MMW photonic MB-OFDM system can transmit data at up to the rate of 480 Mbps and the maximum wireless-transmission distance can reach 3 m.

关键词： Photonics IP networks Frequency modulation Barium

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Outage Performance of Opportunistic Relaying Scheme Without Direct Link Using Antenna Selection

Outage Performance of Opportunistic Relaying Scheme Without ...

引用

2012 IEEE 14th international conference on communication Technology

作者： Ayaz Hussain Muhammad Mushtaque Zuhaibuddin Bhutto Electrical Engineering Department Balochistan Univeristy of Engineering & Technology Mechanical Engineering Department Balochistan Univeristy of Engineering & Technology Computer Systems Engineering Department Balochistan Univeristy of Engineering & Technology

the opportunistic relaying scheme with the selection of antennas at source and destination is the best option,to eliminate the insufficient use of the channel resources and low- cost low-complexity alternative to capture many of the advantages of MIMO (multiple input,multiple output) systems [1][4].In such a scheme,the best relay as well as best antennas at source and destination can be selected for *** this paper,we will introduce the opportunistic amplify and forward relaying scheme without direct link using antennas selection at source and destination *** assumption of independent and not necessarily identical Rayleigh fading channel,in this proposed scheme the exact outage probability performance will be analyzed and observed that the antenna selection provides a good tradeoff between cost,complexity,and *** the other hand,best relay selection scheme has a strong advantage in saving the channel resources compared to regular cooperative diversity networks.

关键词： Antenna Relay Dual-hop Outage Probability.

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