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IEEE Region 10 International conference TENCON

作者： Gun Seo Woo-Chang Hwang Youngok Rhee Access Network Research Team DACOM Research and Development Center Taejon South Korea

Cable telecommunication technology allows high-speed bi-directional transfer of Internet protocol (IP) traffic, between the CATV headend system and customer locations, over all-coaxial or hybrid fiber-coax (HFC) cable network. With the rapid progress of VoIP (voice over IP) technology, IP telephony service via cable networks has become a preferred strategy for cable data service providers. This paper presents an implementation of VoIP cable modem, which is named DCM-100. Design issues, hardware architecture, software architecture, and performance testing results are described.

关键词： Modems Hybrid fiber coaxial cables communication cables Internet telephony Bidirectional control IP networks Protocols Telecommunication traffic optical fiber cables Hardware

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A system architecture for mobile broadband access using wireless ATM

A system architecture for mobile broadband access using wire...

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IEEE International conference on Personal Wireless communication

作者： M. Singh S. Kar S. Prasad D. Arvind Department Of Electrical Engineering Indian Institute of Technology New Delhi India

We present a system level architecture for supporting mobility in an ATM-based wireless personal communication network (PCN). The proposed architecture uses a networking scheme based on intelligent, multicast-based trees with distributed mobility management and predictive resource allocation at the base stations. The addressed functionalities include connection admission, location management and tracking and handoff procedure with QoS support. The associated protocols for implementing these functions are outlined and the architecture is compared vis-a-vis currently existing proposals in the literature. In doing so we discuss key design issues, and speculate on future directions in the development of broadband wireless packet communications systems.

关键词： Asynchronous transfer mode Wireless communication Personal communication networks Base stations B-ISDN Bandwidth Intersymbol interference Frequency Computer networks Centralized control

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Designing macroscopic diversity cellular systems

Designing macroscopic diversity cellular systems

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IEEE conference on Vehicular Technology (VTC)

作者： U. Weiss Institute of Communication Networks and Computer Engineering University of Stuttgart Stuttgart Germany

With regard to the requirement of high capacity and high quality speech and data transmission of future communication systems, we study the application of macroscopic diversity in cellular systems. Macrodiversity is applied during the entire call in order to improve coverage and link quality. The influence on system capacity is studied by the means of discrete event simulation. We propose an access network architecture and cellular layouts which can support macrodiversity. For resource management we apply dynamic channel assignment with an appropriate admission control to guarantee a minimum link quality for all users.

关键词： Radio link Base stations Fading Speech Data communication Mobile communication Relays Radio control Switches communication networks

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Towards uniform channel performance in dynamic WDM systems and networks

Conference on Optical Fiber Communication, Technical Digest ...

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conference on optical Fiber communication, Technical Digest Series 1999年 3-3页

作者： Willner, Alan Eli Univ of Southern California Los Angeles United States

With the introduction of wavelength division multiplexing (WDM), the maintenance of all signals at a high fidelity and signal-to-noise ratio (SNR) will require careful control over changing conditions. Several channel-degrading effects are present in non-static and dynamically-reconfigurable WDM systems and networks. Some of these effects must be addressed by tunable methods so that signals are not degraded with time. issues that need to be considered include: dispersion compensation;channel power equalization;polarization-mode-dispersion (PMD) compensation;and erbium-doped fiber amplifiers (EDFA) gain flattening and transient control.

关键词： optical communication

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A packet-switched WDM network using multi-wavelength selectivity

A packet-switched WDM network using multi-wavelength selecti...

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IEEE International conference on communications (ICC)

作者： Jieh-Chian Wu Department of Computer and Communication Engineering National Kaohsiung First University of Science and Technology Kaohsiung Taiwan

The use of low-speed tunable devices in packet-switched WDM star networks may lead to throughput and delay penalties. We propose (i) a new receiver architecture using multi-wavelength selectivity to eliminate the penalties, and (ii) a corresponding optimal scheduling algorithm for uniform all-to-all transmission. This architecture results in significant cost reduction in comparison with existing pipeline technique. When using 2-wavelength simultaneous selection, our numerical results show that (i) the throughput can increase 40% in comparison with using a tunable filter alone; (ii) the throughput degradation is 2% in comparison with using 2 tunable filters in systems using the pipeline technique.

关键词： WDM networks Wavelength division multiplexing Throughput Pipelines Delay Optimal scheduling optical filters Scheduling algorithm optical packet switching Asynchronous transfer mode

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General architecture, implementation and performance of the digital feedback control in RFX

General architecture, implementation and performance of the ...

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IEEE NPSS conference on Real Time

作者： A. Luchetta G. Manduchi Consorzio REX Corso Stati Uniti Padova Italy

RFX is a large toroidal machine in the European Programme for nuclear fusion research. It uses digital active feedback for both control of global magnetic configuration and correction of local magnetic field errors. These controls have different time requirements. Global controls must produce output reference waveforms with updating frequencies of some kSample/s and must allow a maximum delay between input and corresponding output of few ms. Conversely, the local controls need faster response with updating frequencies of the outputs up to 20 kSample/s and maximum delay of 200 /spl mu/s. The I/O requirements are also different, ranging from few to many tens of input signals, depending on the specific controls. A general scalable distributed architecture has been designed and realized for the RFX feedback control systems. It is based on processor networks implemented by means of digital signal processors equipped with built-in facilities for interprocessor communication and connected to each other either directly or via a fiber-optic based network. The paper summarizes the design concepts of the system architecture and, after the description of the hardware and software structure, reports the performances obtained.

关键词： Toroidal magnetic fields Fusion reactors Error correction Propagation delay Frequency conversion communication system control Feedback control Digital signal processors optical fiber communication Computer architecture

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Making behaviour a concrete architectural concept

Making behaviour a concrete architectural concept

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Annual Hawaii International conference on System Sciences (HICSS)

作者： R.J.A. Buhr Department of Systems and Computer Engineering Carleton University Ottawa Canada

A practical approach is presented to making behaviour a concrete, first-class architectural concept. The approach overcomes the forest-tree problem that results when the only way of understanding behaviour in relation to the organizational aspect of architecture is in terms of sequences of inter-component interactions that emerge at run time (calls, messages, etc). The approach centers around diagrams called use case maps (UCMs) that superimpose sets of continuous wiggly lines (representing signatures of causal sequences) onto arrangements of boxes (representing organizational structure). A powerful feature of the approach is its ability to express large scale dynamic situations clearly. This paper does not present UCMs for the first time, but provides new insight into their essence in relation to architectural issues, alerts workers in the field of software architecture who have not encountered them before to their possibilities, and introduces for the first time a demonstration-of-concept tool to support them.

关键词： Concrete Wiring Computer architecture Software architecture communication system control World Wide Web Computer networks network servers systems engineering and theory Large-scale systems

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network access and synchronization procedures for a CDMA satellite communication system

Network access and synchronization procedures for a CDMA sat...

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MILCOM, Military communications conference

作者： D. Gerakoulis E. Geraniotis Hsuan-Jung Su ATPcT Laboratories Florham Park NJ USA University of Maryland College Park MD USA

This paper provides the network access and synchronization procedures of an orthogonal CDMA geostationary satellite system for fixed service communications. These procedures include, initial synchronization, access channel acquisition and fine synchronization control. We also describe the system architecture and provide the performance evaluation. The main objective is to provide network wide synchronization of all uplink orthogonal CDMA transmissions. This is achieved in steps; first by providing coarse synchronization using the uplink random access channel and then fine sync using innovative tracking control mechanisms. The uplink access channel receiver utilize a parallel/serial search method for rapid code acquisition, while the code tracking of the uplink orthogonal CDMA traffic channel is based on a delay feedback early-late gate in which the sych control resides in the receiver. The proposed system is designed to minimize the onboard complexity and satisfy the performance requirements. As shown in the performance section, the requirement that all uplink transmissions are synchronized to a reference time within 10% of the chip length can be achieved. In addition, the system analysis determines the design parameters values which optimize performance.

关键词： Multiaccess communication Satellite communication Satellite broadcasting Artificial satellites communication system traffic control Downlink communication system control Code division multiplexing control systems Laboratories

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WAAS: a security service for wireless ATM networks

WAAS: a security service for wireless ATM networks

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IEEE conference on Vehicular Technology (VTC)

作者： D. Patiyoot S.J. Shepherd Telecommunications Research Group Department of Electronic & Electrical Engineering University of Bradford Yorkshire UK

Recent years have witnessed the rapid growth in demand for the use of wireless networks especially one which can transmit all services. Wireless ATM is the network that fulfils those requirements. This paper looks at ... 详细信息

关键词： communication system security optical fibers optical receivers Channel capacity Wavelength division multiplexing optical noise Fiber nonlinear optics optical mixing optical fiber dispersion Nonlinear optics

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Tactical network security

Tactical network security

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MILCOM, Military communications conference

作者： S. Jacobs GTE Laboratories Inc. Waltham MA USA

As the US Army evolves its concepts for the tactical battlefield of the 21/sup st/ century, a comprehensive system architecture is unfolding. Yet our combat forces face many potentially sophisticated adversaries who will seek out and attack any vulnerabilities in our combat systems and communications infrastructure they can identify. This paper examines the types of adversaries, the threats they pose and the vulnerabilities most likely targeted within the Army's Warfighter Information network (WIN). An overview is provided of how cryptographic methods may be used to mitigate WIN vulnerabilities. Included is a review of secret key and public key cryptographic methods and their relative advantages and disadvantages. We conclude by identifying a number of security related issues that require further consideration.

关键词： Information security Laboratories Public key cryptography communication system security National security Jacobian matrices Collaboration Command and control systems Storms Context awareness

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