Performance Analysis of Zero Forcing Crosstalk Canceler in Vectored VDSL2

Zafaruddin, S. M.; Prakriya, Shankar; Prasad, S.

doi:10.1109/lsp.2012.2188287

Cited by 14 publications

(7 citation statements)

References 9 publications

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“…Exact results have been obtained by applying Equations (30) and (32) with the SI NR (9) with p = 1. Differences between approximated bit rates are on the order of some Mbit/s and are not clearly distinguishable in the Figures.…”

Section: Validity Of the Bit Rate Approximationmentioning

confidence: 99%

“…Concerning DS transmissions, several pre-coding algorithms have been proposed over the years. Zero forcing (ZF) algorithms based on channel matrix inversion are presented in References [7,8] and their performance limits are investigated in References [9,10]. In Reference [11], the authors propose an alternative pre-coding technique based on the concept of least favourable noise.…”

Section: Introductionmentioning

confidence: 99%

“…Performance of both techniques are compared for G.fast showing MMSE outperforms AZF. Finally, in Reference [9], the authors provide a lower bound on the achievable DS bit rate which is based on a calculation of the achievable bit rate for the worst-case user. This differs from our paper in that no discussion or stochastic characterization of the residual FEXT is provided.…”

Section: Introductionmentioning

confidence: 99%

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A Worst Case Performance Analysis of Approximated Zero Forcing Vectoring for DSL Systems

Mazzenga

Giuliano

2018

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In this paper we introduce a Gaussian approximation for the achievable downstream bit rate per user in modern broadband and ultra-broadband digital subscriber loop-based access systems. The considered formulation allows one to account for the main characteristics of the interference scenario (e.g., number and positions of interferers along the cable), the far-end crosstalk (FEXT) fluctuations, bit loading limitation per sub-carrier, and approximated zero forcing in vectoring pre-coding. Formulas are obtained assuming log-normal statistics for the signal-to-interference plus noise ratio per sub-carrier. The validity of the considered approximation has been assessed by computer calculation. A very good agreement between the exact and the approximated bit rates is obtained. The bit rate approximation is then used to analyze the performance of a very high-speed digital subscriber line type 2 (VDSL2, Profile 35b) with vectoring and used to assess G.fast performance degradation when approximated zero forcing in vectoring pre-coding is applied. It is observed for G.fast performance that degradation due to residual FEXT after vectoring pre-coding can be relevant. A significant performance improvement can be achieved at the expense of increased computational complexity of the vectoring pre-coding.

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Section: Validity Of the Bit Rate Approximationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Worst Case Performance Analysis of Approximated Zero Forcing Vectoring for DSL Systems

Mazzenga

Giuliano

2018

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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%

“…In practice, it gets very close to single-line performance when the RWDD assumption holds, as the case in VDSL2. The RWDD assumption is adopted in [2], [9]- [11] and assessed by:…”

Section: Introductionmentioning

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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A novel technique to reduce Near-Far problem in multi-user VDSL network

Sharma,

Sharma

2023

Ann. Telecommun.

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Performance Analysis of Zero Forcing Crosstalk Canceler in Vectored VDSL2

Cited by 14 publications

References 9 publications

A Worst Case Performance Analysis of Approximated Zero Forcing Vectoring for DSL Systems

A Worst Case Performance Analysis of Approximated Zero Forcing Vectoring for DSL Systems

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

A novel technique to reduce Near-Far problem in multi-user VDSL network

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