Performance of linear and non‐linear precoders in G.fast ultra‐broadband DSL networks

Summary The new International Telecommunication Union Telecommunication G.fast standard for next‐generation ultra‐broadband digital subscriber line systems has stipulated mandatory use of vectoring for crosstalk mitigation. In this paper, we study the performance of downstream precoders in G.fast ne...

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Veröffentlicht in:International journal of communication systems Jg. 30; H. 7; S. np - n/a
Hauptverfasser: Chuah, Teong Chee, Ng, Yin Hoe, Zainal Abidin, Ahmadun Nijar, Asrokin, Azhari, Hashim, Nabihah
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Chichester Wiley Subscription Services, Inc 10.05.2017
Schlagworte:
Channels
Crosstalk
Dispersion
DSL
Error detection
G.fast
Networks
Nonlinearity
Permissible error
precoder
Subscriber line
vectoring
ISSN:1074-5351, 1099-1131
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Zusammenfassung:Summary The new International Telecommunication Union Telecommunication G.fast standard for next‐generation ultra‐broadband digital subscriber line systems has stipulated mandatory use of vectoring for crosstalk mitigation. In this paper, we study the performance of downstream precoders in G.fast networks utilising the extended bandwidth up to 212 MHz. In particular, the issue of strong crosstalk encountered in practical copper cable bundles at high frequencies giving rise to channel matrices which are not row‐wise diagonally dominant (RWDD) as predicted theoretically, as well as the ramification of deploying precoders designed based on the RWDD assumption in practical G.fast channels are studied. To serve these purposes, an enhanced stochastic far‐end crosstalk (FEXT) model which provides distinct FEXT transfer functions with the dispersion range characterised experimentally whilst encompassing the dual‐slope FEXT encountered in non‐RWDD cables is used for evaluating the performance of precoders in diverse G.fast deployment scenarios. Furthermore, the performance sensitivity of precoders under realistic amount of channel estimation errors is investigated on a common framework, allowing a direct and fair comparison between linear and non‐linear precoders. Results show that the nonlinear optimal precoder outperforms linear precoders in all channel conditions; however, the former is found to be slightly more sensitive to channel estimation errors on shorter loops. Copyright © 2016 John Wiley & Sons, Ltd. In this paper, an enhanced stochastic far‐end crosstalk model with the dispersion range characterised experimentally is used for evaluating the performance of downstream precoders in G.fast ultra‐broadband digital subscriber line networks affected by strong crosstalk over the extended bandwidth up to 212 MHz. Furthermore, the performance sensitivity of various precoders under realistic amount of channel estimation errors is investigated on a common framework, allowing a direct and fair comparison between linear and non‐linear precoders.
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ISSN:1074-5351
1099-1131
DOI:10.1002/dac.3167