The Performance of Zero Forcing DSL Systems

Bergel, Itsik; Leshem, Amir

doi:10.1109/lsp.2012.2212011

Cited by 16 publications

(14 citation statements)

References 17 publications

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“…In the following derivations we consider the approximated Zero Forcing (aZF) vectoring pre-coding and cancellation algorithms for DS and US transmissions, respectively [21]. For this algorithm the order of the pre-coding/cancellation matrix is identified by an integer q as indicated in the following of the present Section.…”

Section: Performance Parametersmentioning

confidence: 99%

FttC-Based Fronthaul for 5G Dense/Ultra-Dense Access Network: Performance and Costs in Realistic Scenarios

2017

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Abstract:One distinctive feature of the next 5G systems is the presence of a dense/ultra-dense wireless access network with a large number of access points (or nodes) at short distances from each other. Dense/ultra-dense access networks allow for providing very high transmission capacity to terminals. However, the deployment of dense/ultra-dense networks is slowed down by the cost of the fiber-based infrastructure required to connect radio nodes to the central processing units and then to the core network. In this paper, we investigate the possibility for existing FttC access networks to provide fronthaul capabilities for dense/ultra-dense 5G wireless networks. The analysis is realistic in that it is carried out considering an actual access network scenario, i.e., the Italian FttC deployment. It is assumed that access nodes are connected to the Cabinets and to the corresponding distributors by a number of copper pairs. Different types of cities grouped in terms of population have been considered. Results focus on fronthaul transport capacity provided by the FttC network and have been expressed in terms of the available fronthaul bit rate per node and of the achievable coverage.

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Section: Performance Parametersmentioning

confidence: 99%

FttC-Based Fronthaul for 5G Dense/Ultra-Dense Access Network: Performance and Costs in Realistic Scenarios

2017

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“…To achieve high data rates, the G.fast standard adopts vectoring [11]. This makes it logical to evaluate the performance of AMMIS when it is applied to a group of coordinated lines, or vectored group (VG).…”

Section: A the Effect Of Vectoring On Ammismentioning

confidence: 99%

“…represents the diagonal of a matrix and β is a factor used to control the transmission power of the transmitted symbols [11]. In this situation, the received symbols becomë…”

Section: A the Effect Of Vectoring On Ammismentioning

confidence: 99%

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Mitigation of Alien Crosstalk for Downstream DSL Impaired by Multiple Interferers

Gomes¹,

Medeiros²,

Klautau³

et al. 2017

IEEE Commun. Lett.

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Abstract-Alien crosstalk is one of the major impairments for copper-based transmissions. This letter outlines a method for mitigating alien crosstalk for DSL downstream transmissions impaired by multiple interference sources. The method requires a reference channel, and includes a post processing stage in which induced correlation is applied to prepare the interference at the target channel to be reasonably removed by a prediction based mitigation step. The results show that the proposed method outperforms published alien crosstalk mitigation methods as the number of interference sources increase in G.fast scenarios.

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“…It shows that the even bits QAM have much lower energy increase than the odd bits. (4) 0.280 32 (5) 0.79 64 (6) 0.0684 128 (7) 0.68 256 (8) 0.0170 512 (9) 0.66 1024 (10) 0.0042 2048 (11) 0.65 4096 (12) 0.0011 After normalization, the SNR of the received signal for user i becomes:…”

Section: Non-linear Tomlinson-harashima Precodermentioning

confidence: 99%

Optimizing power normalization for G.fast linear precoder by linear programming

Müller

Eriksson

et al. 2014

2014 IEEE International Conference on Communications (ICC)

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The use of vectoring for crosstalk cancellation in the new ITU-T G.fast standard for next generation DSL systems becomes essential for efficient utilization of the extended bandwidth (up to 200 MHz). In VDSL2 (up to 30 MHz), a zero-forcing-based linear precoder is used in downstream which approaches single-line performance. However, at high frequencies, the linear precoder may amplify the signal power substantially since the crosstalk channel is much stronger than at lower frequencies. Performance could be significantly degraded by power normalization to keep the PSD below the mask. In this work, we extended a per-line power normalization scheme by linear programming (LP) optimization. By simulations using measured cable data it is shown how the LPbased scheme further improves the linear precoder and it is also capable of balancing the data rate between lines. Further, the simulations also show the non-linear Tomlinson-Harashima precoder performs better than the linear precoders.

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The Performance of Zero Forcing DSL Systems

Cited by 16 publications

References 17 publications

FttC-Based Fronthaul for 5G Dense/Ultra-Dense Access Network: Performance and Costs in Realistic Scenarios

FttC-Based Fronthaul for 5G Dense/Ultra-Dense Access Network: Performance and Costs in Realistic Scenarios

Mitigation of Alien Crosstalk for Downstream DSL Impaired by Multiple Interferers

Optimizing power normalization for G.fast linear precoder by linear programming

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