The Experts below are selected from a list of 1506 Experts worldwide ranked by ideXlab platform
Riccardo De Bonis - One of the best experts on this subject based on the ideXlab platform.
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Modeling and simulation of data transmission on a Hybrid Fiber Coax cable network
Simulation Modelling Practice and Theory, 2004Co-Authors: Manuel García, Daniel F. Garcia, Víctor G. García, Riccardo De BonisAbstract:Abstract This paper describes the steps followed in the development, simulation, and later validation of a model for a cable network based on Hybrid Fiber-Coax (HFC) technology, used for data transmission. This work presents a representation of a communication system which has been growing dramatically over recent years and will continue to do so in the near future. The modeling process is based on the analysis of measurements of a cable operator, establishing a direct relationship between model parameters and network characteristics. The modeling technique produces a scalable model capable of simulating the evolution of the real cable network.
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Modeling and simulation of data transmission on a Hybrid Fiber Coax cable network
Simulation Modelling Practice and Theory, 2004Co-Authors: M. Garcia, V. G. Garcia, D.f. Garcia, Riccardo De BonisAbstract:This paper describes the steps followed in the development, simulation, and later validation of a model for a cable network based on Hybrid Fiber-Coax (HFC) technology, used for data transmission. This work presents a representation of a communication system which has been growing dramatically over recent years and will continue to do so in the near future. The modeling process is based on the analysis of measurements of a cable operator, establishing a direct relationship between model parameters and network characteristics. The modeling technique produces a scalable model capable of simulating the evolution of the real cable network. © 2004 Elsevier B.V. All rights reserved.
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Analysis and modeling of traffic on a Hybrid Fiber-Coax network
IEEE Journal on Selected Areas in Communications, 2004Co-Authors: M. Garcia, V. G. Garcia, D.f. Garcia, Riccardo De BonisAbstract:This paper presents the study carried out on the data traffic collected on the network of a cable operator based on Hybrid Fiber-Coax technology, and the subsequent simulation model developed to predict the bandwidth requirements of the network channels. The paper starts with the analysis of the traffic measurements, taken over two periods of time in one year, on all the network's channels. This analysis identifies the main characteristics of the traffic, as well as some relationships between network parameters and their persistence over time. The paper proceeds to present the development of a simulation model, which represents the cable network. This model is built from the results of the traffic analysis and network parameters. The major challenge of this model is to predict the traffic on each channel of the cable network, related to parameters of the network configuration, such as the number of assigned subscribers to the channel and the time of day. To reach this goal, the simulation model has been developed with a modular structure, which gives it flexibility to adapt to changes in the network. The process followed involves the establishment of a traffic model, a system model, and finally, the validation of the results.
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HSNMC - Traffic Model Characterization of an HFC Network
Lecture Notes in Computer Science, 2003Co-Authors: Manuel García, Daniel F. Garcia, Víctor G. García, Riccardo De BonisAbstract:This paper describes the traffic model developed to represent the traffic observed on the telecommunication network of a cable operator providing data services. The operator network is based on a Hybrid Fiber Coax (HFC) network using ATM technology. The traffic model is based on the measurements taken on the upstream channels of the network and represents the behavior of the subscribers by simulation.
T E Darcie - One of the best experts on this subject based on the ideXlab platform.
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broad band am vsb 64 qam cable tv system over Hybrid Fiber Coax network
IEEE Photonics Technology Letters, 1995Co-Authors: X Lu, G E Bodeep, T E DarcieAbstract:We demonstrate the first broad-band AM-VSB/64 QAM cable TV system that delivers 60 traditional AM-VSB channels and ten 64 QAM (90 Mb/s/channel) channels using a single commercial DFB laser over a Hybrid Fiber/Coax network. At the end-user site, high quality AM-VSB and digital have been achieved with greatly increased channel capacity by operating this system within limits imposed by noise, distortion, and clipping-induced impulse noise
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Broad-band AM-VSB/64 QAM cable TV system over Hybrid Fiber/Coax network
IEEE Photonics Technology Letters, 1995Co-Authors: X Lu, G E Bodeep, T E DarcieAbstract:We demonstrate the first broad-band AM-VSB/64 QAM cable TV system that delivers 60 traditional AM-VSB channels and ten 64 QAM (90 Mb/s/channel) channels using a single commercial DFB laser over a Hybrid Fiber/Coax network. At the end-user site, high quality AM-VSB and digital have been achieved with greatly increased channel capacity by operating this system within limits imposed by noise, distortion, and clipping-induced impulse noise
Praveen Jain - One of the best experts on this subject based on the ideXlab platform.
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modeling and performance of a power distribution system for Hybrid Fiber Coax networks
IEEE Transactions on Power Electronics, 1999Co-Authors: Praveen JainAbstract:This paper presents the performance of a power distribution system for Hybrid Fiber/Coax networks. The power scheme uses 90 V 60 Hz trapezoidal voltage distribution over the network. A simulation model of the proposed distribution system is developed, and the performance under steady-state, transient, and dynamic conditions is studied. The system loading capability as a function of cable size and distribution length is presented. It is shown in the paper that synchronous power sources can provide a much larger distribution reach than asynchronous sources. In order to ride through a fault in the system, it is found that the power supplies used in the Coax node and the home termination unit should have enough holdup time capability. A system designed in this manner is inherently stable.
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considerations for powering the Hybrid Fiber Coax networks
International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '96, 1998Co-Authors: Praveen JainAbstract:A high frequency ac power distribution systems for the drop segment of a Hybrid Fiber/Coax architecture is presented. It is shown in the paper that the high frequency distribution system provides self current limiting against a short circuit fault and no voltage glitch across the other converters. A prototype system which distributes 30 Vrms at 128 kHz over Coax cable is built and experimental results are given which support the high frequency distribution as an attractive and viable option.
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Considerations for powering the Hybrid Fiber/Coax networks
International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '96, 1998Co-Authors: Praveen JainAbstract:A high frequency ac power distribution systems for the drop segment of a Hybrid Fiber/Coax architecture is presented. It is shown in the paper that the high frequency distribution system provides self current limiting against a short circuit fault and no voltage glitch across the other converters. A prototype system which distributes 30 Vrms at 128 kHz over Coax cable is built and experimental results are given which support the high frequency distribution as an attractive and viable option.
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design of a near unity power factor single phase trapezoidal ac power supply for Hybrid Fiber Coax network
International Telecommunications Energy Conference, 1996Co-Authors: N. Kaushik, Praveen Jain, Geza JoosAbstract:This paper presents the design and implementation aspects of a single-phase trapezoidal AC power supply based on a one-cycle reset integral control technique for Hybrid Fiber/Coax telecommunication network applications. A performance-based comparison of various PWM techniques demonstrates the superiority of the proposed control approach. A detailed design procedure to select and rate the components of the system is illustrated by means of a design example. Further, the control circuit implementation details are also presented. Finally, the performance of the proposed topology is evaluated, experimentally, in terms of input power factor, input THD and efficiency.
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alternatives for powering the Hybrid Fiber Coax networks
International Telecommunications Energy Conference, 1994Co-Authors: Praveen Jain, D. Cooper, N. TulliusAbstract:The characteristics of three types of power distribution systems for a drop segment of a Hybrid optical Fiber/Coaxial cable telecommunication architecture are compared: DC; low frequency AC; and high frequency AC. It is shown in the paper that the high frequency distribution system has potential advantages in terms of high efficiency, small size of power converters, and low cost of powering. A prototype system which distributes 30 V (RMS) at 128 kHz over Coaxial cable is built and experimental results are given which support the high frequency distribution as an attractive and viable option. >
Geza Joos - One of the best experts on this subject based on the ideXlab platform.
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design of a near unity power factor single phase trapezoidal ac power supply for Hybrid Fiber Coax network
International Telecommunications Energy Conference, 1996Co-Authors: N. Kaushik, Praveen Jain, Geza JoosAbstract:This paper presents the design and implementation aspects of a single-phase trapezoidal AC power supply based on a one-cycle reset integral control technique for Hybrid Fiber/Coax telecommunication network applications. A performance-based comparison of various PWM techniques demonstrates the superiority of the proposed control approach. A detailed design procedure to select and rate the components of the system is illustrated by means of a design example. Further, the control circuit implementation details are also presented. Finally, the performance of the proposed topology is evaluated, experimentally, in terms of input power factor, input THD and efficiency.
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Near unity power factor single phase trapezoidal AC power supply with minimum DC bus capacitor
IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting, 1996Co-Authors: N. Kaushik, Geza Joos, P. JainAbstract:Conventional power factor correction circuits use a boost stage between rectifier and inverter. This paper proposes a topology that does not require either a boost stage or a large DC bus capacitor; it uses a voltage-controlled inverter in the output stage, in which the PWM modulating function is synchronized with the DC capacitor voltage ripple. A number of feedforward voltage controlled PWM pattern generator options are presented. They are used to produce the trapezoidal waveforms required to power Hybrid Fiber/Coax cable systems. Theoretical and design considerations are validated on an experimental unit.
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Design of a near unity power factor single phase trapezoidal AC power supply for Hybrid Fiber/Coax network
Proceedings of Intelec'96 - International Telecommunications Energy Conference, 1996Co-Authors: N. Kaushik, P. Jain, Geza JoosAbstract:This paper presents the design and implementation aspects of a single-phase trapezoidal AC power supply based on a one-cycle reset integral control technique for Hybrid Fiber/Coax telecommunication network applications. A performance-based comparison of various PWM techniques demonstrates the superiority of the proposed control approach. A detailed design procedure to select and rate the components of the system is illustrated by means of a design example. Further, the control circuit implementation details are also presented. Finally, the performance of the proposed topology is evaluated, experimentally, in terms of input power factor, input THD and efficiency.
Chia-jen Wu - One of the best experts on this subject based on the ideXlab platform.
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PCUP: pipelined cyclic upstream protocol over Hybrid Fiber Coax
Proceedings of INFOCOM '97, 1997Co-Authors: Chia-jen WuAbstract:In order to span the NII (National Information Infrastructure) into the homes, the community cable TV networks have to be re-engineered to support two-way interactive services. We propose the PCUP (pipelined cyclic upstream protocol) as the upstream MAC (medium access control) protocol for HFC (Hybrid Fiber Coax) community access network. The PCUP is designed with the intention of pipelining the upstream channel. This is achieved by proper station positioning, which measures the station propagation offset from the headend, and transmission scheduling, which assigns each station the transmission starting time and duration in a cycle. By taking into account the propagation offsets and the transmission times, the transmitted cells can appear back-to-back, ie. pipelined, at the headend. Since only the active stations are scheduled to transmit in a cycle, a membership control mechanism, which runs a contention-based tree walk algorithm, is executed periodically to allow the stations to join or leave. We also compare the PCUP with various schemes proposed to IEEE 802.14 committee.
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INFOCOM - PCUP: pipelined cyclic upstream protocol over Hybrid Fiber Coax
Proceedings of INFOCOM '97, 1997Co-Authors: Chia-jen WuAbstract:In order to span the NII (National Information Infrastructure) into the homes, the community cable TV networks have to be re-engineered to support two-way interactive services. We propose the PCUP (pipelined cyclic upstream protocol) as the upstream MAC (medium access control) protocol for HFC (Hybrid Fiber Coax) community access network. The PCUP is designed with the intention of pipelining the upstream channel. This is achieved by proper station positioning, which measures the station propagation offset from the headend, and transmission scheduling, which assigns each station the transmission starting time and duration in a cycle. By taking into account the propagation offsets and the transmission times, the transmitted cells can appear back-to-back, ie. pipelined, at the headend. Since only the active stations are scheduled to transmit in a cycle, a membership control mechanism, which runs a contention-based tree walk algorithm, is executed periodically to allow the stations to join or leave. We also compare the PCUP with various schemes proposed to IEEE 802.14 committee.
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PCUP: pipelined cyclic upstream protocol over Hybrid Fiber Coax
IEEE Network, 1997Co-Authors: Chia-jen WuAbstract:In order to bring the NII (National Information Infrastructure) into the home, the community cable TV networks have to be reengineered to support two-way interactive services. The authors propose the PCUP (pipelined cyclic upstream protocol) as the upstream MAC (medium access control) protocol for the HFC (Hybrid Fiber Coax) community access network. The PCUP is designed with the intention of pipelining the upstream channel. This is achieved by proper station positioning, which measures the station propagation offset from the headend, and transmission scheduling which assigns each station a transmission starting time and duration in a cycle. By taking into account the propagation offsets and transmission lines, transmitted cells can appear back-to-back (i.e., pipelined) at the headend. Since only the active stations are scheduled to transmit in a cycle, a membership control mechanism, which runs a contention-based tree walk algorithm, is executed periodically to allow the stations to join or leave. The authors also compare the PCUP with various schemes proposed to the IEEE 802.14 committee.
