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Rainer Strobel - One of the best experts on this subject based on the ideXlab platform.

  • channel models for twisted pair cable bundles
    2019
    Co-Authors: Rainer Strobel
    Abstract:

    Twisted pair cables used in the access network were not built for the frequencies up to 212 MHz used by G.fast. With increasing frequency, the simplified modeling approach used for VDSL2 does no longer give accurate results because the behavior of twisted pair cables changes. This chapter presents measurement data of twisted pair cables at G.fast frequencies and introduces a MIMO cable binder model for the copper access network in the fiber to the Distribution Point topology.

  • EUSIPCO - Implementation aspects of nonlinear precoding for G.fast — coding and legacy receivers
    2017 25th European Signal Processing Conference (EUSIPCO), 2017
    Co-Authors: Rainer Strobel, Andreas Barthelme, Wolfgang Utschick
    Abstract:

    Hybrid copper/fiber networks bridge the gap between the fiber link at the Distribution Point and the customer by using copper wires over the last meters. The G.fast technology has been designed to be used in such a fiber to the Distribution Point (FTTdp) network. Crosstalk management using MIMO precoding is a key to the required performance of FTTdp. With higher frequencies used on copper wires, nonlinear precoding schemes such as Tomlinson Harashima precoding are discussed as an alternative to linear precoding. This paper focuses on the advantages and losses of Tomlinson Harashima precoding used for coded transmission on twisted pair cable bundles. A performance loss model for the Modulo loss in coded transmission is presented. Interoperability between linear and nonlinear precoding is discussed.

  • the itu t s new g fast standard brings dsl into the gigabit era
    IEEE Communications Magazine, 2016
    Co-Authors: Vladimir Oksman, Rainer Strobel, Dong Wei, Xiang Wang, Rami Verbin, Richard Goodson, Massimo Sorbara
    Abstract:

    This article explores the recently issued ITU-T Recommendations specifying "G.fast" (G.9701 [1] and G.9700 [2]) that bring user bit rates up to 1 Gb/s over twisted pairs from the Distribution Point to customer premises. The overview and some key research challenges of G.fast are discussed in [3]. The standardized G.fast transmission method and advanced crosstalk cancellation techniques are presented here with specific performance projections and measurement results achieved during the first demonstrations and trials, showing bit rates of 500 Mb/s over 250 m and available reach up to 400 m. A description of standardized tools for dynamic performance maintenance, resource allocation, and power saving enhancing G.fast applications concludes this article.

  • GLOBECOM - Zero-Forcing and MMSE Precoding for G.fast
    2015 IEEE Global Communications Conference (GLOBECOM), 2015
    Co-Authors: Rainer Strobel, Andreas Barthelme, Wolfgang Utschick
    Abstract:

    Hybrid copper/fiber networks bridge the gap between the fiber link at the Distribution Point and the customer by using copper wires over the last meters. The G.fast transmission technology has been designed to be used in such a fiber to the Distribution Point (FTTdp) network. Crosstalk management using MIMO precoding in downlink and MIMO equalization in uplink is a key to the required performance of FTTdp. Currently, there are mostly linear and nonlinear zero-forcing (ZF) methods discussed for precoding in G.fast. This paper presents a spectrum optimization algorithm for both zero-forcing precoding methods. Minimum mean squared error (MMSE) precoding shows significant advantages under certain channel conditions. A performance comparison of MMSE precoding for G.fast with linear and nonlinear zero-forcing methods indicates that MMSE precoding outperforms standard linear and nonlinear ZF precoding. Applying the proposed spectrum optimization brings all three methods to a similar performance.

  • ICC - Achievable rates with implementation limitations for G.fast-based hybrid copper/fiber networks
    2015 IEEE International Conference on Communications (ICC), 2015
    Co-Authors: Rainer Strobel, Michael Joham, Wolfgang Utschick
    Abstract:

    Hybrid copper/fiber networks bridge the gap between the fiber link and the customer by using copper wires over the last meters. This solution combines energy efficiency and low cost of the copper access network with high data rates of a fiber connection. However, the fiber to the Distribution Point (FTTdp) network must prove its ability to convey data at fiber speed over copper wire bundles under the spectral constraints of the copper access network.

Wolfgang Utschick - One of the best experts on this subject based on the ideXlab platform.

  • EUSIPCO - Implementation aspects of nonlinear precoding for G.fast — coding and legacy receivers
    2017 25th European Signal Processing Conference (EUSIPCO), 2017
    Co-Authors: Rainer Strobel, Andreas Barthelme, Wolfgang Utschick
    Abstract:

    Hybrid copper/fiber networks bridge the gap between the fiber link at the Distribution Point and the customer by using copper wires over the last meters. The G.fast technology has been designed to be used in such a fiber to the Distribution Point (FTTdp) network. Crosstalk management using MIMO precoding is a key to the required performance of FTTdp. With higher frequencies used on copper wires, nonlinear precoding schemes such as Tomlinson Harashima precoding are discussed as an alternative to linear precoding. This paper focuses on the advantages and losses of Tomlinson Harashima precoding used for coded transmission on twisted pair cable bundles. A performance loss model for the Modulo loss in coded transmission is presented. Interoperability between linear and nonlinear precoding is discussed.

  • GLOBECOM - Zero-Forcing and MMSE Precoding for G.fast
    2015 IEEE Global Communications Conference (GLOBECOM), 2015
    Co-Authors: Rainer Strobel, Andreas Barthelme, Wolfgang Utschick
    Abstract:

    Hybrid copper/fiber networks bridge the gap between the fiber link at the Distribution Point and the customer by using copper wires over the last meters. The G.fast transmission technology has been designed to be used in such a fiber to the Distribution Point (FTTdp) network. Crosstalk management using MIMO precoding in downlink and MIMO equalization in uplink is a key to the required performance of FTTdp. Currently, there are mostly linear and nonlinear zero-forcing (ZF) methods discussed for precoding in G.fast. This paper presents a spectrum optimization algorithm for both zero-forcing precoding methods. Minimum mean squared error (MMSE) precoding shows significant advantages under certain channel conditions. A performance comparison of MMSE precoding for G.fast with linear and nonlinear zero-forcing methods indicates that MMSE precoding outperforms standard linear and nonlinear ZF precoding. Applying the proposed spectrum optimization brings all three methods to a similar performance.

  • ICC - Achievable rates with implementation limitations for G.fast-based hybrid copper/fiber networks
    2015 IEEE International Conference on Communications (ICC), 2015
    Co-Authors: Rainer Strobel, Michael Joham, Wolfgang Utschick
    Abstract:

    Hybrid copper/fiber networks bridge the gap between the fiber link and the customer by using copper wires over the last meters. This solution combines energy efficiency and low cost of the copper access network with high data rates of a fiber connection. However, the fiber to the Distribution Point (FTTdp) network must prove its ability to convey data at fiber speed over copper wire bundles under the spectral constraints of the copper access network.

  • GLOBECOM - Wideband modeling of twisted-pair cables for MIMO applications
    2013 IEEE Global Communications Conference (GLOBECOM), 2013
    Co-Authors: Rainer Strobel, Reinhard Stolle, Wolfgang Utschick
    Abstract:

    Recent trends in broadband access technology show the demand to extend the used frequency bands up to hundreds of MHz. Access cables are not built for such high frequencies, and measurements of access cables in this frequency range show a significant change of the cable characteristics compared to low frequencies. The novel modeling approach presented here is designed to be used for evaluation of transmission technologies for fiber-copper hybrid networks, so called FTTdp (Fiber To The Distribution Point), which enables service providers to serve customers with data rates in the GBit/s range without the requirement to install fiber to the home.

Wilfrid Perruquetti - One of the best experts on this subject based on the ideXlab platform.

  • Switching time estimation for linear switched systems: an algebraic approach
    2009
    Co-Authors: Yang Tian, Thierry Floquet, Lotfi Belkoura, Wilfrid Perruquetti
    Abstract:

    This paper aims at estimating the switching time for linear switched systems, i.e. the time instant when a sub-model is switched on while another one is switched off. Assuming that the state of the active sub-models is known, a Distribution Point of view is adopted to get a real-time estimation of these switching times. Real-time means that an explicit algorithm computes on-line these time instants in a fast and efficient way. Simulations illustrate the proposed techniques which is easily implementable.

  • CDC - Switching time estimation for linear switched systems: an algebraic approach
    Proceedings of the 48h IEEE Conference on Decision and Control (CDC) held jointly with 2009 28th Chinese Control Conference, 2009
    Co-Authors: Yang Tian, Thierry Floquet, Lotfi Belkoura, Wilfrid Perruquetti
    Abstract:

    This paper aims at estimating the switching time for linear switched systems, i.e. the time instant when a sub-model is switched on while another one is switched off. Assuming that the state of the active sub-models is known, a Distribution Point of view is adopted to get a real-time estimation of these switching times. Real-time means that an explicit algorithm computes on-line these time instants in a fast and efficient way. Simulations illustrate the proposed techniques which is easily implementable.

T. C. Rao - One of the best experts on this subject based on the ideXlab platform.

  • Classification studies of lead–zinc ore fines using water-injection cyclone
    International Journal of Mineral Processing, 2005
    Co-Authors: K. Udaya Bhaskar, B. Govindarajan, J. P. Barnwal, K. K. Rao, B. K. Gupta, T. C. Rao
    Abstract:

    Classification studies to recover liberated particles of lead and zinc minerals from a ground lead–zinc ore were carried out using a 100-mm water-injection cyclone. The effects of variables on the performance of water-injection cyclone are discussed. The results indicated that the injection water rate has a complex interaction with the other variables like spigot opening, feed inlet pressure, and vortex finder opening. A set of empirical equations for slurry throughput, corrected cyclone cut size, minimum Distribution Point, and reduced efficiency numbers was developed for predicting the performance of water-injection cyclone. Finally, the results obtained in water-injection cyclone are compared with the data obtained on a similar diameter (100 mm) hydrocyclone.

  • classification studies of lead zinc ore fines using water injection cyclone
    International Journal of Mineral Processing, 2005
    Co-Authors: Udaya K Bhaskar, B. Govindarajan, J. P. Barnwal, K. K. Rao, B. K. Gupta, T. C. Rao
    Abstract:

    Classification studies to recover liberated particles of lead and zinc minerals from a ground lead–zinc ore were carried out using a 100-mm water-injection cyclone. The effects of variables on the performance of water-injection cyclone are discussed. The results indicated that the injection water rate has a complex interaction with the other variables like spigot opening, feed inlet pressure, and vortex finder opening. A set of empirical equations for slurry throughput, corrected cyclone cut size, minimum Distribution Point, and reduced efficiency numbers was developed for predicting the performance of water-injection cyclone. Finally, the results obtained in water-injection cyclone are compared with the data obtained on a similar diameter (100 mm) hydrocyclone.

David B. Payne - One of the best experts on this subject based on the ideXlab platform.

  • Low-power optical feeder for VDSL over twisted pair for last mile access networks
    2006
    Co-Authors: Sandra Dudley, Terence Quinlan, Ian D. Henning, Stuart D. Walker, R.p. Davey, A.d. Wallace, Ivan Boyd, David B. Payne
    Abstract:

    In this paper, we describe an ultra-low-power optoelectronic very-high-data-rate digital subscriber line (VDSL) system, enabling broadband access to the home over 10 km of optical fiber and 1 km of twisted pair. The cabinet/Distribution Point interface has a footprint of just 3 × 3 × 1 cm, and consumes only 165 mW. A quadrature-amplitude-modulation (QAM) scheme was used for system tests with 10 Mb/s full duplex achieved, and up to 40-dB up/downstream channel isolation is obtained using hybrid transformers.

  • Low-power optical feeder for VDSL over twisted pair for last mile access networks
    Journal of Lightwave Technology, 2006
    Co-Authors: Sandra Dudley, Terence Quinlan, Ian D. Henning, Stuart D. Walker, R.p. Davey, A.d. Wallace, Ivan Boyd, David B. Payne
    Abstract:

    In this paper, we describe an ultra-low-power optoelectronic very-high-data-rate digital subscriber line (VDSL) system, enabling broadband access to the home over 10 km of optical fiber and 1 km of twisted pair. The cabinet/Distribution Point interface has a footprint of just 3 /spl times/ 3 /spl times/ 1 cm, and consumes only 165 mW. A quadrature-amplitude-modulation (QAM) scheme was used for system tests with 10 Mb/s full duplex achieved, and up to 40-dB up/downstream channel isolation is obtained using hybrid transformers.