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An Adaptive TCP Delayed Acknowledgment Strategy in Interaction with MAC Layer over Multi-hop Ad Hoc Networks

An Adaptive TCP Delayed Acknowledgment Strategy in Interacti...

引用

International Symposium on computer Science and its Applications, CSA

作者： Farzaneh R. Armaghani Sudhanshu S. Jamuar Sabira Khatun Mod F.A. Rasid Department of Computer and Communication System Engineering Universiti Putra Malaysia Malaysia Department of Computer and Communication System Engineering Department of Electrical and Electronic Engineering University Putra Malaysia Malaysia Universiti Putra Malaysia Serdang Selangor MY

ISBN: (纸本)9780769534282

The acknowledgment strategy has great potential to increase the TCP throughput when it runs over 802.11 MAC protocol. In particular, TCP acknowledgments carry out an extensive number of medium accesses as they compete in the same route as data packets for media. As the load increases, the well-known hidden terminal effects caused by interference between ACK and data packets in MAC layer can degrade TCP performance dramatically if TCP acknowledges every incoming data packets. In this paper a dynamic TCP-MAC interaction strategy has been proposed which tries to reduce the number of induced ACKs by monitoring the channel condition. To this end, the total collision probability collected along the path from sender to receiver in MAC layer has been used to properly set the number of delayed ACKs (DA) in TCP. Based on the measured collision probability, TCP sender dynamically adjusts itself to the channel condition by delaying less ACKs in high traffics and more in low traffic conditions. The simulation results show a throughput improvement up to 15% over the existing method called dynamic adaptive acknowledgment (TCP-DAA) and much more over the regular TCP in the scenarios dealing with a dynamic loss rate.

关键词： Throughput Receivers Topology Monitoring Media Access Protocol Wireless networks Network topology

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Analysis of angle diversity in MIMO channel

Analysis of angle diversity in MIMO channel

引用

IEEE 2008 6th National Conference on Telecommunication Technologies and IEEE 2008 2nd Malaysia Conference on Photonics, NCTT-MCP 2008

作者： Rose, M.R. Che Suaidi, M.K. Aziz, M.Z.A. Abd Kadir, M.F. Abdul Misman, D. Shah, M.S.R. Mohd Rahim, M.K.A. Department of Telecommunication Faculty of Electronic and Computer Engineering Universiti Teknikal Malaysia Melaka Hang Tuah Jaya Ayer Keroh 75450 Melaka Malaysia Wireless Communication Center Faculty of Electrical Engineering Universiti Teknologi Malaysia 81300 Skudai Johor Malaysia

ISBN: (纸本)9781424422159

This paper present the results and performance of angle diversity for direction of arrival OOA) setup. The 4x4 Butler Matrix was been used at transmitter and receiver sides. The 2x2 rectangular patches have been used as a transmitter and receiver medium for wireless transmission. The operating frequency for this measurement is 2.4GHz in WLAN application. This paper analyze about DOA and AOA for angle diversity technique. © 2008 IEEE.

关键词： Transmitters

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Centralized scheduling, routing tree in WiMAX mesh networks

Centralized scheduling, routing tree in WiMAX mesh networks

引用

International Conference on Innovations in Information Technology

作者： Ali Al-Hemyari Nor Kamariah Noordin Alyani Ismail Sabira Khatun Yaseen H. Tahir Y.A. Qassem Department of Computer & Communication Systems Engineering Universiti Putra Malaysia Malaysia Department of Computer & Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia

In the last few years, demand for high speed internet access service has increased greatly so the IEEE 802.16 working group on broadband wireless access (BWA) is developing the worldwide interoperability for microwave access (WiMAX) standard for wireless metropolitan area networks (MANs) which aims to provide broadband wireless last mile access, easy deployment, and high speed data rate for large spanning area. This paper propose an efficient routing and collision free centralized scheduling (CS) algorithms using single channel single transceiver system in WiMAX mesh network, which introduces the cross layer concept between the network layer and media access controller (MAC) layer. The proposed approach has improved the system performance in the aspects of scheduling length, channel utilization ratio (CUR), and the throughput of the system.

关键词： Routing WiMAX Mesh networks IP networks Web and internet services Standards development Wireless LAN Metropolitan area networks Scheduling algorithm Transceivers

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Comparison of detection techniques in optical CDMA access network for point to multipoint configuration

Comparison of detection techniques in optical CDMA access ne...

引用

International Conference on Electronic Design (ICED)

作者： M. Othman M.F.M. Rejab R. Talib N.A. Cholan M.F.L. Abdullah S.A. Aljunid M.K. Abdullah Department of Communication Engineering Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn Malaysia Johor Malaysia School of Computer & Communication Engineering Universiti Malaysia Pedis Kuala Perlis Perlis Malaysia Photonics Laboratory Department of Computer and Communication System Faculty of Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia

In this paper, we are proposing a detection scheme known as spectral direct detection technique implemented with fiber bragg grating (FBG) act as encoder/decoder. This FBG based is used to encode and decode the spectral amplitude coding namely modified double weight (MDW) code in optical code division multiple access (OCDMA). This code is used due to its flexibility where its weight can be any even number that greater than two. Moreover, it can maintain the cross-correlation parameter equal to one. The performance of spectral direct detection technique against AND-subtraction technique which is both implemented with FBG based encoder/decoder is compared via simulation in downstream and upstream access network at point to multipoint (P2MP) configuration. The simulation will be carried out using Optisystem version 6.0 and the performance is characterized through bit error rate (BER) and power received at various bit rate.

关键词： Optical detectors Optical fiber networks Multiaccess communication Optical receivers Bragg gratings Fiber gratings Decoding Optical filters Optical signal processing Phase detection

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The design of a generic framework for integrating ECA components

The design of a generic framework for integrating ECA compon...

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7th International Joint Conference on Autonomous Agents and Multiagent systems, AAMAS 2008

作者： Huang, Hung-Hsuan Nishida, Toyoaki Cerekovic, Aleksandra Pandzic, Igor S. Nakano, Yukiko Graduate School of Informatics Kyoto University Japan Faculty of Electrical Engineering and Computing University of Zagreb Croatia Department of Computer Information and Communication Sciences Tokyo University of Agriculture and Technology Japan

ISBN: (纸本)9781605604701

Embodied Conversational Agents (EGAs) are life-like computer generated characters that interact with human users in face-to-face multi-modal conversations. ECA systems are generally complex and difficult for individual research groups to develop. Therefore, if there was a common framework for connecting ECA functioning blocks seamlessly to an integrated system, redundant effort can be saved. This paper discusses the issues emerged in developing such a framework and introduces the design and preliminary results of our ongoing project, Generic ECA Framework. Copyright © 2008, International Foundation for Autonomous Agents and Multiagent systems (***). All rights reserved.

关键词： Multi agent systems

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A survey of active transmission technique for improve quality of service in Multimedia Over IP

A survey of active transmission technique for improve qualit...

引用

International Symposium on Information Technology, ITSim

作者： Mohd Farhan Ngatman Johan M. Sharif Md Asri Ngadi Department of Computer System and Communication Faculty of Computer Science and Information Systems Universiti Teknologi Malaysia Skudai Johor Malaysia

Multimedia over IP (MOIP) is one of IP-based realtime communication that has been gaining popularity in recent years. Quality-of-service (QoS) is still one of the major challenges in real-time communication over IP networks. Excessive delay severely impairs communication interactivity, while packet loss results in glitches in audio and poor picture quality and frozen frames in video. In this paper, we perform a survey of the existing active transmission technique. We list out several features and functionalities for research continuity in this area.

关键词： Multimedia communication Streaming media Quality of service IP networks Unicast Algorithm design and analysis Delay

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Cooperative sensing under limited band control channel in cognitive radio networks

Cooperative sensing under limited band control channel in co...

引用

IEEE 2008 6th National Conference on Telecommunication Technologies and IEEE 2008 2nd Malaysia Conference on Photonics, NCTT-MCP 2008

作者： Mokhtar, Rania A. Khatun, Sabira Ali, Burhanuddin M. Ramli, Abd Rahman Department of Computer and Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia Wireless Communications Centre MIMOS Berhad Technology Park Malaysia 57000 Kuala Lumpur Malaysia

ISBN: (纸本)9781424422159

In the context of cognitive radio the cooperative spectrum sensing has been proposed to overcome the problem associated with the local sensing for example the hidden node problem due to noise uncertainty, fading, and shadowing. However, sensing results reporting requires perfect channel to avoid the performance degradation. It also requires a large bandwidth under the hypothesis of large number of cognitive users. This paper presents a hard decision auto-correction reporting scheme that is able to correct the error in the reported bit directly. This system further minimizes the average number of the reporting bits by allowing only the user with detection information (binary decision 1) to report its result. The sensing performance is investigated and the numerical results show significant decrease in reporting bits without affecting the sensing performance. © 2008 IEEE.

关键词： Cognitive radio

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Energy-efficient multi-speed algorithm for scheduling dependent real-time tasks

Energy-efficient multi-speed algorithm for scheduling depend...

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International Conference on computer engineering and systems

作者： A. M. Elewi M. H. A. Awadalla M. I. Eladawy Communication Electronicsand Computer Engineering Department Faculty of Engineering Helwan University Cairo Egypt

Reducing energy consumption is a critical issue in the design of battery-powered embedded systems to prolong battery life. With dynamic voltage scaling (DVS) processors, energy consumption can be reduced efficiently by making appropriate decisions on the processor speed/voltage during the scheduling of real time tasks. This paper addresses the problem of energy efficient real-time task scheduling over earliest deadline first (EDF) scheduling policy where the tasks are dependent due to shared resources. Furthermore, the paper proposes enhancements over the existing multi-speed (MS) algorithm where the proposed algorithm achieves more energy saving and has the capability to function with both stack resource policy (SRP) and dynamic priority ceiling protocol (DPCP) as resource access protocols.

关键词： Energy efficiency Scheduling algorithm Processor scheduling Energy consumption Dynamic voltage scaling Access protocols Embedded system Batteries Voltage control Dynamic scheduling

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Expression and illumination invariant preprocessing technique for Face Recognition

Expression and illumination invariant preprocessing techniqu...

引用

International Conference on computer engineering and systems

作者： A. Abbas M. I. Khalil S. Abdel-Hay H. M. Fahmy Computer and System Engineering Department Faculty of Engineering Ain Shams University Cairo Egypt

Face recognition is one of the most intensively studied topics in the field of computer vision and pattern recognition. Facial expression, which changes face geometry, usually has an adverse effect on the performance of a face recognition system. Also, the appearance of a face image is usually affected by illumination conditions that hinder the automatic face recognition process. In this paper, we propose a robust expression and illumination invariant preprocessing technique for face recognition. We propose a new wavelet based method to eliminate the effect of expression variation and combine this method with an existing DCT based method for illumination normalization. Experimental results on the Yale database show that the proposed approach improves the face recognition rates.

关键词： Lighting Face recognition Wavelet transforms Discrete cosine transforms Histograms Frequency Adaptive equalizers computer vision Face detection Testing

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Adaptive MAC protocol for wireless sensor networks in periodic data collection applications

Adaptive MAC protocol for wireless sensor networks in period...

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International Symposium on Information Technology, ITSim

作者： Maryam Vahabi Mohd. Fadlee A. Rasid M. Hossein Fotouhi G. Raja Syamsul Azmir Raja Abdullah Department of Computer and Communication Systems Engineering Universiti Putra Malaysia Serdang Malaysia Department of Computer and Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia Serdang Malaysia

In this paper, we propose a new medium access control (MAC) protocol for wireless sensor networks for environmental monitoring applications. The proposed MAC scheme is specifically designed for wireless sensor networks which have periodic traffic with different sampling rates. In our protocol design, only sink can start and maintain synchronization and also determine the time schedule for all other nodes in the network. We discuss the design of TA-PDC-MAC protocol and provide a comparison with the previous PDC-MAC protocol through simulation. Under different traffic generation rate, our protocol outperforms the previous one in terms of energy consumption, packet loss rate and packet delay.

关键词： Protocols Sensors Energy consumption Schedules Media Access Protocol Wireless sensor networks Energy efficiency

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