Modeling the Dual-Slope Behavior of in-Quad EL-FEXT in Twisted Pair Quad Cables

Brink, R.F.M. van den

doi:10.1109/tcomm.2017.2669032

Cited by 11 publications

(9 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…known as the equal level FEXT [56], is shown to increase with the frequency in Eq. (2), implying the deterioration of multi-user interference at high frequencies ( Fig.…”

Section: ) Crosstalk Channelmentioning

confidence: 99%

“…4). We refer the readers to further references for more in-depth modelling of crosstalk channels [56]- [58]. The excessive level of FEXT at high frequencies has led to some of the most pronounced research challenges in the wireline communications community.…”

Section: ) Crosstalk Channelmentioning

confidence: 99%

“…(57) Because the choice of constellation is shared by all pairs on the same tone for the LR-ZFP and the LR-THP, we emphasize this fact by neglecting the pair index j for the terms ρ t and P t in Eq. (56) and (57). In terms of the transmitter's power transfer characteristics between the input u u u t and the output x x x t , Eq.…”

Section: ) Inner Spectrum Balancing Policymentioning

confidence: 99%

See 2 more Smart Citations

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

Zhang

et al. 2020

IEEE Access

View full text Add to dashboard Cite

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.

show abstract

“…known as the equal level FEXT [56], is shown to increase with the frequency in Eq. (2), implying the deterioration of multi-user interference at high frequencies ( Fig.…”

Section: ) Crosstalk Channelmentioning

confidence: 99%

Section: ) Crosstalk Channelmentioning

confidence: 99%

Section: ) Inner Spectrum Balancing Policymentioning

confidence: 99%

See 1 more Smart Citation

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

Zhang

et al. 2020

IEEE Access

View full text Add to dashboard Cite

show abstract

“…For instance, field measurement results obtained on copper cable bundles (eg, previous studies [6][7][8][9] ) have shown that the FEXT over G.fast frequencies may exhibit dual-slope phenomenon. For instance, field measurement results obtained on copper cable bundles (eg, previous studies [6][7][8][9] ) have shown that the FEXT over G.fast frequencies may exhibit dual-slope phenomenon.…”

Section: Introductionmentioning

confidence: 99%

“…Towards this end, it is important to highlight that FEXT can become increasingly stronger as frequency increases, thus reducing the diagonal dominance. For instance, field measurement results obtained on copper cable bundles (eg, previous studies [6][7][8][9] ) have shown that the FEXT over G.fast frequencies may exhibit dual-slope phenomenon. Consequently, the channel matrix may not necessarily be RWDD over the entire G.fast spectra.…”

Section: Introductionmentioning

confidence: 99%

Multimode precoding for crosstalk mitigation in ultra‐broadband DSL systems

Chuah

Abidin³

et al. 2018

Int J Communication

View full text Add to dashboard Cite

The achievable downstream bit-rate performance of digital subscriber line (DSL) channels using low-complexity linear precoders is suboptimal when the row-wise diagonally dominant property of the channel matrix does not hold at high frequencies anticipated to be exploited in future-generation DSL systems, while the optimal nonlinear precoder is computationally demanding. In this paper, we propose two multimode precoders, which are operable in four modes on each tone. Specifically, the proposed precoding strategies exploit the insertion loss and crosstalk information inferred from the channel matrix to execute mode selection for all the transmission tones. The computational complexity of the proposed multimode precoders is derived and compared with existing precoders. Simulation results show that the proposed precoders can achieve near-optimal performance at a lower computational complexity.

show abstract

Modeling electromagnetic wave coupling and mode conversion effects in multitwisted bundle of twisted‐wire pairs (MTB‐TWP) above ground plane

Gassab

Zhou

Wang

et al. 2018

Int J Numerical Modelling

View full text Add to dashboard Cite

A multiconductor transmission line (MTL) model is developed for predicting electromagnetic wave coupling effects with multitwisted bundle of twisted‐wire pairs (MTB‐TWP) running above a ground plane. Such MTB‐TWP is described as a sequential repeated structure, where all its parameters are formulated in terms of sequences. In particular, the parametric equations of all the wires are derived and described by a set of generalized equations, where the unit tangent vector for each wire is also determined analytically. In addition, the averaged per‐unit‐length (p.u.l.) parameters are described by recurrence formulas. Further, the equivalent voltages for describing the field‐to‐wire coupling of MTB‐TWP are obtained and determined analytically. The modal domain decomposition is performed with special loading terminals to split out the common mode (CM) and differential mode (DM) signals, where the CM‐to‐DM conversions are further investigated in order to indicate the balanced property in such MTB‐TWP system. On the other hand, the effect of dielectric coatings of all the wires is also characterized, where the averaged modal p.u.l. capacitance matrix is obtained numerically. A comparison is performed with the other wiring structures to visualize the benefits of our MTB‐TWP model. An extended MTL model is also validated in comparison with the commercial software FEKO.

show abstract

Modeling the Dual-Slope Behavior of in-Quad EL-FEXT in Twisted Pair Quad Cables

Cited by 11 publications

References 4 publications

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

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

Multimode precoding for crosstalk mitigation in ultra‐broadband DSL systems

Modeling electromagnetic wave coupling and mode conversion effects in multitwisted bundle of twisted‐wire pairs (MTB‐TWP) above ground plane

Contact Info

Product

Resources

About