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Hybrid networks: cellular-relay architecture

Hybrid networks: cellular-relay architecture

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international conference on Wireless and Optical communications ( WOCC)

作者： H. Viswanathan S. Mukherjee R. Ramjee Bell Laboratories Lucent Technologies Inc. Murray Hill NJ USA

Summary form only given. Peer-to-peer communication networks such as sensor networks, personal area networks and wireless local area networks are characterized by multi-hop wireless communications in which information may be routed from source to destination via multiple wireless links. On the other hand cellular networks are single-hop networks in which wireless communication is between the mobile node and the base station only. Convergence will be a main theme of future networks that provide ubiquitous high rate services seamlessly through converged technologies. Motivated by this we propose cellular network architectures with multihop transmission from the base station to terminals and vice versa through relays. Relays are network elements (fixed or mobile) or other user terminals that have significantly more intelligence than repeaters and are capable of storing and forwarding data and making scheduling and routing decisions. Relay nodes are not connected to the wireline network through a back-haul connection, but have to rely on wireless transmission to communicate to the base station. We discuss a variety of deployment scenarios involving multi-hop transmission through relays. Cellular-relay networks could be such that the relay to terminal links use different spectrum than base to terminal links. For example, the relays could communicate to the terminals through a wireless local area network using the IEEE 802.11 air interface, in which case the relays are like access points and use the unlicensed band, while the base station transmits to the relays using the licensed cellular network spectrum. In this model, mobile terminals are assumed to have both cellular and IEEE 802.11 interfaces, which is becoming increasingly common. An alternative scenario is one in which the two kinds of hops use two different carriers within the spectrum assigned to the cellular network operator. It is also possible to deploy relays in such a way that no additional carrier or spect

关键词： Relays Land mobile radio cellular systems Base stations Peer to peer computing Wireless communication Wireless sensor networks Wireless LAN Spread spectrum communication Power system relaying Sensor phenomena and characterization

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Timing jitter control of an add/drop optical module in a convergent network

Timing jitter control of an add/drop optical module in a con...

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international conference on Wireless and Optical communications ( WOCC)

作者： Minglai Kao Multiplex Inc. South Plainfield NJ USA

Summary form only given. Timing jitter is the deviation of a signal from its "should be" position in time and it is one of the major sources of errors in communication networks especially for high data-rate systems. Two factors that make jitter control more important and more difficult than ever before in a convergent network are the ever-increasing data rates and the natural disparities of various applications. As the data rate increases, the timing window for data capture becomes smaller and smaller and therefore the difficulty of correctly capturing the data increases. Timing jitters further reduce the window and thereby increase the probability of data-sampling or data-recovery errors. With more and more applications are being converged to the network, the timing variations among these applications increase and therefore impose more technical challenges for recovering the clock and the data. Sources of timing jitters in general can be categorized as random or deterministic. the former comes from the random nature of electronic components such as thermal noise and shock noise while the latter is normally attributed to the design. three measurements are typical for modules - jitter tolerance, jitter transfer, and jitter generation. Since jitter cannot be eliminated completely, a module should be able to tolerate the maximum amount of jitters that could possible exist in a system without making any error. the measurement of jitter tolerance of a module is to ensure this capacity. the measurement of jitter transfer is to find out how much jitter that a module adds to that of an incoming signal. the measurement of jitter generation is the measurement of the jitter that a module generates. Technology advancement has made the measurements of jitter much easier. Instruments are now available for these measurements. However, differences among the various instruments as well as accuracies of measurements are some of the major concerns. Although jitters cannot be eliminate

关键词： Timing jitter Optical control Optical fiber networks communication system control Instruments Electromagnetic interference Signal design thermal management communication networks Clocks

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Hyperfine spectral phase coded optical CDMA: component technologies and networking applications

Hyperfine spectral phase coded optical CDMA: component techn...

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international conference on Wireless and Optical communications ( WOCC)

作者： P. Toliver S. Etemad Telcordia Technologies Inc. Red Bank NJ USA

Summary form only given. this paper will focus on a specific coherent approach to OCDMA referred to as spectral phase coding. What is unique about this work over previous research is the fine spectral resolution at which our orthogonal phase codes are applied. through the use of ultra-narrow spectral filtering techniques, including hyperfine DWDM filters and ring resonator technologies, our system is able to accurately tailor the spectral phase of each distinct frequency lines from a mode-locked laser operating at 5 or 10 GHz. this approach enables us to make the spectral width of the OCDMA signal, coded with an orthogonal phase mask covering 16 frequency bins, compatible with filtering and transmission components used in conventional DWDM systems aligned on a 100 or 200 GHz ITU grid. By combining coherent OCDMA with orthogonal coding and synchronous user operation, the largest overall system spectral efficiency can be achieved. In addition to describing the system architecture and device technologies, we will also present recent experimental results on practical optical networking applications, including the transmission of OCDMA with other conventional DWDM channels (inter-band compatibility). In addition, we show it is possible to have the OCDMA signal coexist with a conventional DWDM channel within the same passband (intraband compatibility). Finally, we demonstrate the ease at which OCDMA signals can be translated from one code to another code using completely passive optics, and discuss how this function can be exploited in a practical OCDMA networks.

关键词： Optical devices Optical fiber networks Multiaccess communication Optical ring resonators Wavelength division multiplexing Optical filters Resonator filters Filtering Frequency Laser mode locking

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the manipulation by statistical characteristics of broadband signal in telecommunications systems

The manipulation by statistical characteristics of broadband...

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14th international Crimean conference on Microwave and Telecommunication Technology

作者： Kolesov, VV Zalogin, NN RAS Inst Radioengn & Elect Moscow 125009 Russia

the broadband communication channel model on basis of information signal modulation of statistical parameters of noise-like signal was considered.

ISBN: (纸本)9667968693

the broadband communication channel model on basis of information signal modulation of statistical parameters of noise-like signal was considered.

关键词： Telecommunication networks

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A reconfigurable communication processor compatible with different industrial fieldbuses 14th

A reconfigurable communication processor compatible with dif...

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14th international conference on Field Programmable Logic and Applications, FPL 2004

作者： Valdés, Ma Dolores Domínguez, Miguel Ángel Moure, Ma José Quintáns, Camilo Departamento de Tecnología Electrónica University of Vigo Vigo36200 Spain

ISBN: (纸本)3540229892

Fieldbuses constitute the lower level of communication networks in a flexible manufacturing system. Nowadays there are a lot of proprietary protocols, thus the interconnection of equipment from different mansufacturers has become very problematic. Changing equipment supposes the change of the fieldbus too with the consequent economic losses. this paper proposes the implementation of a communication processor based on a reconfigurable device that makes different fieldbuses compatible. In this way, using the appropriate level and impedance matching circuit, the same hardware can be connected to different fieldbuses. In order to verify this proposal a communication processor based on an FPGA supporting two very important fieldbus standards in the area of industrial control such as WorldFIP and Profibus, has been developed. Design constraints and performance of the implemented processor are analyzed in this paper. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Flexible manufacturing systems

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14th international conference on Electronics, communications and Computers CONIELECOMP 2004

14th International Conference on Electronics, Communications...

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international conference on Electronics, communications and Computers (CONIELECOMP)

the following topics are dealt with: robotics; communication systems; power electronics; signal processing; control and system identification; networking; neural networks and pattern recognition; instrumentation; opto...

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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

Proceedings - 14th international conference on Electronics, communications and Computers, CONIELECOMP 2004

作者： Leyva, F.H. Ramírez Cuellar, J.P. Acevedo Basilio, R.G. Maldonado Justo, E. Espinosa

ISBN: (纸本)076952074X

In this work, a wireless system able to test up to four Remote Terminal Unit (RTU) is shown. Each RTU establish communication with a Master Unit (MU) through a radio modem, making use of the MODBUS protocol. In this work, 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®. this software ask for information from each RTU, save 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： Wireless telecommunication systems

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Network-on-chip for reconfigurable systems: From high-level design down to implementation

Network-on-chip for reconfigurable systems: From high-level ...

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14th international conference on Field-Programmable Logic and Applications

作者： Bartic, TA Desmet, D Mignolet, JY Marescaux, T Verkest, D Vernalde, S Lauwereins, R Miller, J Robert, F IMEC B-3001 Louvain Belgium Free Univ Brussels B-1050 Brussels Belgium Katholieke Univ Leuven Louvain Belgium

ISBN: (纸本)3540229892

In order to use networks-on-Chip as communication infrastructure for heterogeneous, reconfigurable systems-on-Chip, a set of tools are needed that would allow for an evaluation of the performance of a particular network, and a fast implementation of the system. In this paper we present two models that can be used in the design and implementation of the platform and of its applications. the first model is written in synthesisable VHDL, and it is highly parameterizable allowing a fast network implementation. the second one is a cycle-accurate SystemC model that allows a fast exploration of the design space. the models offer complementary information and help the platform and the application designers to make the best trade-offs. We present how the two models can be used for platform optimization and implementation and for application mapping, using a motion JPEG decoder as a case study. We analyze the system performance as a function of the different design parameters and we present the implementation results for the reconfigurable platform that we have built.

关键词： Network-on-chip

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2004 14th international Crimean conference "Microwave and Telecommunication Technology" (IEEE Cat. No.04EX843)

2004 14th International Crimean Conference "Microwave and Te...

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international Crimean conference on Microwave & Telecommunication Technology

the following topics are dealt with: wireless access networks; training of radioengineers and specialists in the field of telecommunications; solid state devices; CAD/CAM of solid state devices; electrovacuum and microvacuum SHF devices; systems of microwave communication, broadcasting and navigation; antennas and antenna elements; passive components; materials and technology of microwave devices, nanoelectronics and nanotechnology; very high power microwave electronics and effects; microwave measurements; radiolocation and microwave applications; medical and ecological applications; and radioastronomy, remote sensing and wave propagation.

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Choice of multistation protocol access in the small corporate satellite communication network

Choice of multistation protocol access in the small corporat...

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international Crimean conference on Microwave & Telecommunication Technology

作者： D. Sunegin S. Sushko K. Sunduchkov Research Institute of Telecommunications Kiev Polytechnical Institute National Technical University Kiev Ukraine

A review of multistation access for the System of Operative Monitoring (a small corporate satellite communication network) is carried out. the direction of further research for the organization of SOM is chosen. Proto... 详细信息

关键词： Access protocols Intelligent networks Satellite communication Helium Organizing IEEE catalog Microwave technology Multimedia communication World Wide Web Artificial satellites

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