Exploiting the Phantom-Mode Signal in DSL Applications

Foubert, Wim; Neus, Carine; Biesen, Leo Van; Rolain, Yves

doi:10.1109/tim.2011.2174100

Cited by 19 publications

(26 citation statements)

References 8 publications

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“…It is evident that the model (1) is suitable for both star-quads and phantom circuits. Comparing the results in Figures 2 and 3, the attenuation of phantom circuits is higher, which corresponds with the general conclusions provided in [19]. During the manufacturing process of metallic cables, various imperfections due to the tolerances can occur.…”

Section: Measurements and Modeling Of Phantom Circuitssupporting

confidence: 86%

“…However, the perfect impedance matching is usually not possible in practice, and this can lead into reflections occurring at both sides of a line [19]. The metallic cable was a standard 26 AWG type containing 25 star-quads, and the length of the cable was l = 0.1 km.…”

Section: Measurements and Modeling Of Phantom Circuitsmentioning

confidence: 99%

“…Moreover, this idea was further extended by the application of phantom virtual circuits in star-quad metallic cables [18]. Thanks to that, two pairs in a quad and a phantom circuit can be bonded together to increase the overall throughput of one single G.fast subscriber line [19].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of phantom circuit benefits for next generation xDSL systems

Lafata

2014

Int J Communication

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This paper is focused on measurements and analysis of phantom mode benefits in G.fast and next generation xDSL systems. The investigation is based on real measurements performed for a multi-quad metallic cable together with theoretical evaluations of phantom circuit potentials. Because the presence of phantom circuits leads into increasing the summary crosstalk level in a metallic cable, the application of a phantom mode is questionable in practice. That is why the investigation was performed, and conclusions provided in this paper can be helpful to decide potential benefits of this method for future applications. The elimination of a crosstalk can be performed by using advanced modulation techniques such as vectored discrete multitone modulation (VDMT); however, its application in practice is limited because of its complexity and computational demands. That is why several scenarios are currently being discussed with either no VDMT application or with only partial crosstalk compensation. Because of that, this paper is focused on comparing the results for a first scenario without using any far-end crosstalk (FEXT) elimination technique, whereas a second scenario is based on partial FEXT suppression by VDMT application, to decide the effectiveness of using phantom modes in practice.

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Section: Measurements and Modeling Of Phantom Circuitssupporting

confidence: 86%

Section: Measurements and Modeling Of Phantom Circuitsmentioning

confidence: 99%

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Investigation of phantom circuit benefits for next generation xDSL systems

Lafata

2014

Int J Communication

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“…The frequency dependency of the primary line constants originates from the skin effect as described in Eq. (10) and (11). The resulting resistance matrix R is a diagonal matrix and therefore, Eq.…”

Section: Statistical Model For Primary Line Constantsmentioning

confidence: 96%

“…Therefore, it is not feasible to cascade channel matrices from the ATIS model. Several approaches, e. g. [9] have been made to create cable models which are closer to the physical characteristics of a cable binder and characterize not only the differential mode, but also the phantom mode of a cable binder [10].…”

Section: B Crosstalk Modelsmentioning

confidence: 99%

Wideband modeling of twisted-pair cables for MIMO applications

Strobel

Stollé

Utschick

2013

2013 IEEE Global Communications Conference (GLOBECOM)

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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.

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Far-End Crosstalk Mitigation for Future Wireline Networks Beyond G.mgfast: A Survey and an Outlook

Zhang

et al. 2020

IEEE Access

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With the escalating demand for high speed, high reliability, low latency, low cost and ubiquitous connectivity, the telecommunications industry is entering a new era where the ultimate optimality of the current wireline-wireless access network has to be achieved. Regarding the current wireline network paradigm, dominated by the copper-based digital subscriber lines (DSL) technology, multi-Gigabit data rate is the ambitious design objective at the customer end for the forthcoming ITU-T G.mgfast standard. In order to prepare for the new challenges in the era of total network convergence, both the wireline and the wireless community must be able to think beyond their respective conventions and learn from each other if necessary. Overall, the current DSL-based wireline network architecture is prone to the mutual interference resulting in far-end crosstalk (FEXT). The newly expanded 424/848 MHz spectrum of the ambitious G.mgfast project introduces far higher FEXT than that over the current 212/30 MHz G.fast/VDSL2 band. Additionally, the coexistence of multiple standards will also cause 'alien' FEXT. In these cases, using the plain zero forcing precoding (ZFP) will no longer attain a sufficiently high performance. However, as shown in the field of wireless communications, using lattice reduction as a signal space remapping technique significantly improves the performance of traditional multiuser detectors (MUD) and of the respective multiuser precoders (MUP). These promising techniques have largely remained unexploited in commercial wireless communications, due to their complexity in the face of the rapidly fluctuating wireless channels. In this survey, we present an overview of the state-of-the-art in wireline access network and an outlook for recent technological advances in the holistic 'wireline + wireless' access network in the context of network convergence, focusing on the dominant challenge of FEXT mitigation in future DSL networks. Against this background, we investigate both the family of linear precoding and of the Tomlinson-Harashima precoding (THP) schemes conceived for classic DSL. Furthermore, we present a tutorial on the family of lattice reduction aided MUPs, as well as quantifying their expected performances in realistic DSL scenarios. As a by-product, we also demonstrate the duality between MUP and MUD, in the hope that the fifty years' history of MUD could be used to accelerate the development of efficient near-optimal MUPs for future DSL. Under the recommended operating conditions of the 212 MHz profile of G.fast, our benchmark comparisons indicate that the lattice reduction aided techniques are very powerful compared to conventional schemes. In particular, their good performances do not rely on optimized spectrum balancing, and they are also shown to be relatively robust against channel state information (CSI) estimation error, under the assumption of perfectly time-invariant DSL channels.

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Exploiting the Phantom-Mode Signal in DSL Applications

Cited by 19 publications

References 8 publications

Investigation of phantom circuit benefits for next generation xDSL systems

Investigation of phantom circuit benefits for next generation xDSL systems

Wideband modeling of twisted-pair cables for MIMO applications

Far-End Crosstalk Mitigation for Future Wireline Networks Beyond G.mgfast: A Survey and an Outlook

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