Title | ||
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A Worst Case Performance Analysis Of Approximated Zero Forcing Vectoring For Dsl Systems |
Abstract | ||
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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. |
Year | DOI | Venue |
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2018 | 10.3390/info9050108 | INFORMATION |
Keywords | Field | DocType |
subscriber loop, crosstalk, VDSL, G.fast, vectoring | Data mining,Residual,G.fast,Fext,Control theory,Computer science,Digital subscriber line,Broadband,Interference (wave propagation),Performance improvement,Computational complexity theory | Journal |
Volume | Issue | ISSN |
9 | 5 | 2078-2489 |
Citations | PageRank | References |
0 | 0.34 | 9 |
Authors | ||
2 |
Name | Order | Citations | PageRank |
---|---|---|---|
Franco Mazzenga | 1 | 153 | 35.12 |
Romeo Giuliano | 2 | 263 | 45.48 |