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Software system for analysis of electromagnetic compatibility between fixed service equipment and DCS-1800 base equipment with grouped frequency application

Software system for analysis of electromagnetic compatibilit...

引用

international Crimean conference on Microwave & Telecommunication Technology

作者： Y.L. Maximenko A.V. Lyagoskin I.G. Kovalenko Military unit A0375 Kyiv Ukraine

the functioning of the mobile cellular communications network DCS-1800 with application of the mode of frequency channel grouped utilization permits us to increase effectiveness of both use of assigned frequencies and system interference immunity. the capabilities of a software system designed for electromagnetic compatibility assessment, its application and ways of development are described.

关键词： Software systems Electromagnetic analysis Electromagnetic compatibility Frequency Application software Cellular networks communication networks Interference Immunity testing Software design

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SDL specification of a security architecture for WorldFIP

SDL specification of a security architecture for WorldFIP

引用

international conference on Electronics, communications and Computers (CONIELECOMP)

作者： M.L. Chavez F.R. Henriquez Benemérita Universidad Autónoma de Puebia Puebla Mexico Sección de Computación CINVESTAV San Pedro Zacatenco Mexico

Fieldbuses are special purpose local area networks (LAN) used to connect all kinds of devices in a factory. the paper discusses security in fieldbuses, and presents a security architecture, such as WorldFIP (World Factory Instrumentation Protocol), for centralized fieldbuses. the discussion takes into account, on one hand, the security services defined by the OSI security architecture, and, on the other hand, the security mechanisms defined by WorldFIP. the discussion shows that there are two critical points for attacking this network: the bus arbitrator and the bus. the paper presents the specification, using the specification and description language (SDL), of a security architecture for WorldFIP based on the RC4 algorithm, which is a lightweight cryptographic stream cipher.

关键词： Protection communication system security Open systems communication channels Data security Computer architecture Cryptography Local area networks Production facilities Automatic control

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Implementation of mobile broadband radioaccess systems on the base of MIMO technology

Implementation of mobile broadband radioaccess systems on th...

引用

international Crimean conference on Microwave & Telecommunication Technology

作者： S.A. Kravchuk M.B. Borisova Res. institute of telecommunications NTUU Kyiv Ukraine

We present the new technology of spatial-temporal diversities of MIMO signals, which has potential for creation of mobile broadband radioaccess systems due to large information capacity and interference nonsusceptibility from multibeam propagation. the most prospective direction of further improvement of mobile telecommunications is implementation of high-speed broadband radioaccess systems (voice link, transmission of video and data) on this basis. However there is an actual problem in obtaining high transfer rates in radio systems for mobile service. the transfer rate of fixed wireless broadband access systems reaches tens of megabits per second, while using cellular networks of 3rd and 4th generations (3G, 4G) it is possible to reach transfer rates for the mobile user of no more than 2 Mbit/s. the major factor which impedes the increase of information transfer rate is multiray propagation in the radio channel between the mobile user and base station. In order to decide this problem, the so-called multi-antenna technology MIMO (multi input multi output) and a number of its modifications are used.

关键词： MIMO Rail to rail outputs Broadband antennas Artificial intelligence 3G mobile communication Rayleigh channels Software radio Base stations communication industry Interference

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Wireless system for electrical networks testing based on MODBUS protocol

Wireless system for electrical networks testing based on MOD...

引用

international conference on Electronics, communications and Computers (CONIELECOMP)

作者： F.H. Ramirez Leyva J.P.A. Cuellar R.G.M. Basilio E.E. Justo

A wireless system able to test up to four remote terminal units (RTU) is presented. Each RTU establishes communication with a master unit (MU) through a radio modem, making use of the MODBUS protocol. Two kinds of RTUs were used. One of them consists of real electrical power meters, while the other one consist of a personal computer that works as an electrical power meter emulator. the master unit can be as far as 4 km distance from each RTU. the MU permanently runs a graphical software developed with LabVIEW/sup /spl reg//. this software asks for information from each RTU, saves this information in a file and generates a report. the information refers to the main three-phase electrical network variables, which are voltage, current, frequency, power factor, harmonic distortion and active, reactive and apparent power.

关键词： System testing Wireless application protocol SCADA systems Microcomputers Voltage Reactive power Instruments Electric variables measurement Harmonic distortion communication system control

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2003 IEEE 18th Annual Workshop on Computer communications (IEEE Cat. No.03EX779)

2003 IEEE 18th Annual Workshop on Computer Communications (I...

引用

IEEE Workshop on Computer communications (CCW)

the following topics are dealt with: computer communications; wireless networks; Mobile IP; wireless LAN; ad hoc wireless networks; CDMA networks; QoS-related SCTP; stream control transmission protocol; embedded systems; resource allocation; multimedia applications; GMPLS; congestion control; satellite networks; sensor networks; wireless micro sensor networks; biomedical applications; optical time division multiplexed wavelength-routed networks; Internet caching protocol; grid computing; multicast; position-based routing; programmable mobile networks.

关键词： Computer networks Transport protocols Wireless LAN Code division multiaccess Resource management Multimedia communication Traffic control (communication) Satellite communication Biomedical telemetry Time division multiplexing Optical fiber communication Internet communication system routing Mobile communication

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Securing mobile networks in an operational setting

Securing mobile networks in an operational setting

引用

IEEE Workshop on Computer communications (CCW)

作者： W.D. Ivancic D.H. Stewart T.L. Bell P.E. Paulsen D. Shell NASA Glenn Research Center NASA Glenn Research Center USA NASA Glenn Research Center Verizon GRC NASA Glenn Research Center Lockheed Martin GRC USA NASA Glenn Research Center Paulsen NASA GRC Cleveland OH USA Cisco Systems Inc. San Jose CA USA

the paper describes a network demonstration and three month field trial of mobile networking using Mobile-IPv4. the network was implemented as part of the US Coast Guard operational network which is a ".mil" network and requires stringent levels of security. the initial demonstrations took place in November 2002 and a three month field trial took place from July through September of 2003. the mobile network utilized encryptors capable of NSA-approved Type 1 algorithms, a mobile router from Cisco systems and 802.11 and satellite wireless links. the paper also describes a conceptual architecture for wide-scale deployment of secure mobile networking in operational environments where both private and public infrastructures are used. Additional issues presented include link costs, placement of encryptors and running routing protocols over layer-3 encryption devices.

关键词： Intelligent networks NASA Space technology Cryptography Mobile communication communication system security Costs Routing protocols IP networks Aircraft navigation

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A low-complexity silence suppression algorithm for mobile communication in noisy environments 14

A low-complexity silence suppression algorithm for mobile co...

引用

14th international conference on Digital Signal Processing (DSP 2002)

作者： Beritelli, F Casale, S Serrano, S Univ Catania Dipartimento Ingn Informat & Telecomun I-95125 Catania Italy

ISBN: (纸本)0780375033

the paper presents a new low-complexity algorithm for silence suppression in adverse acoustic environments. the algorithm uses a single input parameter given to a simple matching block.. the decision module adapts a series of thresholds by varying the estimated signal to noise ratio. A series of tests carried out using a large speech database confirm a 10% improvement in performance as compared with the AMR VAD option I recently adopted by ETSI for 3(rd)-generation mobile systems.

关键词： Signal to noise ratio

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DSP implementation of a neural network based blind multiuser receiver for DS-CDMA communication systems 14

DSP implementation of a neural network based blind multiuser...

引用

14th international conference on Digital Signal Processing (DSP 2002)

作者： Fantacci, R Guidi, F Rastelli, F Tarchi, D Tortoli, P Univ Florence Dipartimento Elettr & Telecomunicazioni I-50139 Florence Italy

ISBN: (纸本)0780375033

Broadband wireless communications are going to be widespread by the Universal Mobile Telecommunications System (IMT/2000), which is based on Wideband-Code Division Multiple Access (W-CDMA) techniques. Adaptive Blind Multiuser Detection, widely proposed for the mobile station receiver, reaches the optimum solution after a certain number of bit times. In this paper we propose the implementation on a fixed point Digital Signal Processor (DSP) architecture of the adaptive blind algorithm based on a neural approach. A modified Kennedy-Chua neural network, based on the Hopfield model, is proposed in this work, and its implementation on a fixed point numerical environment has been studied by means of computer simulation. Finally we briefly talk about a medium level implementation of the algorithm on a Texas Instruments DSP.

关键词： Digital signal processors

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Reliability of InP-based avalanche photodiodes for high bit-rate fiber-optic communication systems

Reliability of InP-based avalanche photodiodes for high bit-...

引用

14th Indium Phosphide and Related Materials conference

作者： Smetona, S. Klunder, K. An, S. Rousina-Webb, R. Emmerstorfer, B. Jamroz, E. Rouabhi, M. Mallard, R. Nortel Networks Optical Components P O Box 3511 Ottawa Ont. K1Y 4H7 Canada

We report on a study of the impact of mechanical stress on the electrical properties of InP-based avalanche photodiodes used in OC48 and OC192 10Gb/s fiber-optic communication applications. the device structure under study consists of separate absorption, grading, charge and multiplication regions. A large population of devices, which were die bonded onto carriers using a range of epoxy and eutectic solder adhesives, has been subjected to accelerated lifetest for >5000h under high thermal and electrical overstress conditions. In addition we have performed an analysis of the response of the current-voltage characteristics of the device to an external mechanical stress. the mechanical stress experiments give insight into variations in device performance that may arise if the die bonding process is not performed properly. Relaxation in device strain, due to thermally induced epoxy bond degradation, is shown to be a potential hazard, which can interfere with reliability assessment of the device. When these factors are controlled, the device lifetime exhibits the expected log-normal distribution, characterized by an exceptionally low wearout FIT rate.

关键词： Photodiodes

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Controller area network implementation in microwave systems

Controller area network implementation in microwave systems

引用

international conference on Microwaves, Radar and Wireless communications

作者： P. Furmanski Z. Stolarski Wroclaw Division Telecommunications Research Institute Wroclaw Poland

High speed transmission and high immunity against electromagnetic interference makes the CAN bus very popular in industrial control systems, car industry and many other applications. the paper presents a model of cont... 详细信息

关键词： Control systems Intelligent networks communication system control Protocols Cyclic redundancy check Electromagnetic interference Industrial control Electrical equipment industry Bit rate Microwave circuits

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