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Spatially adaptive linear precoding for systems beyond G.Fast

Spatially adaptive linear precoding for systems beyond G.Fast
Spatially adaptive linear precoding for systems beyond G.Fast

The next generation of Digital Subscriber Line (DSL) technologies seek to exploit frequencies beyond 106 MHz and up to 500 MHz where Far-End Crosstalk (FEXT) becomes excessive; for these frequencies effective crosstalk cancellation, also known as vectoring, is essential. This paper proposes a novel spatially adaptive linear precoder and explores its performance, alongside classical Zero-Forcing Precoding (ZFP) and Tomlinson-Harashima Precoding (THP) methods, under two distinct scenarios. In this paper, the objective function is set to maximise the aggregate capacity of the copper MIMO channel. All precoding methods benefit from a coordinated bitloading to maximise the spectra within a defined power spectrum density (PSD) mask. Results suggest that THP's superiority is substantial in the fixed cable length scenario whilst the proposed Spatially Adaptive Generalised ZFP (SA-GZFP) outperforms the latter marginally in the dendritic one. The paper further suggests that a spatially adaptive nonlinear precoder may have the potential of combining the gains of THP and Maximal Ratio Transmission (MRT) for greater system performance.

2576-6813
IEEE
Stigant, Liam
4a541bdb-2488-4fc1-b17f-def464e20eb9
Zhang, Rong
e54ae375-3495-4e40-aff1-4b8635ee2ede
Humphrey, Leslie D.
c029d5fb-8063-4304-8d69-d447df6a4377
Linney, Trevor P.
32001077-b198-4d1f-8369-b62b8d20175a
Morsman, Trevor
b9c5fda4-c60d-40f6-9f19-b938eada0c25
Al Rawi, Anas F.
3dc2fc54-4b70-40f1-9511-8fa054e307e7
Stigant, Liam
4a541bdb-2488-4fc1-b17f-def464e20eb9
Zhang, Rong
e54ae375-3495-4e40-aff1-4b8635ee2ede
Humphrey, Leslie D.
c029d5fb-8063-4304-8d69-d447df6a4377
Linney, Trevor P.
32001077-b198-4d1f-8369-b62b8d20175a
Morsman, Trevor
b9c5fda4-c60d-40f6-9f19-b938eada0c25
Al Rawi, Anas F.
3dc2fc54-4b70-40f1-9511-8fa054e307e7

Stigant, Liam, Zhang, Rong, Humphrey, Leslie D., Linney, Trevor P., Morsman, Trevor and Al Rawi, Anas F. (2019) Spatially adaptive linear precoding for systems beyond G.Fast. In 2018 IEEE Global Communications Conference (GLOBECOM). IEEE. 6 pp . (doi:10.1109/GLOCOM.2018.8648147).

Record type: Conference or Workshop Item (Paper)

Abstract

The next generation of Digital Subscriber Line (DSL) technologies seek to exploit frequencies beyond 106 MHz and up to 500 MHz where Far-End Crosstalk (FEXT) becomes excessive; for these frequencies effective crosstalk cancellation, also known as vectoring, is essential. This paper proposes a novel spatially adaptive linear precoder and explores its performance, alongside classical Zero-Forcing Precoding (ZFP) and Tomlinson-Harashima Precoding (THP) methods, under two distinct scenarios. In this paper, the objective function is set to maximise the aggregate capacity of the copper MIMO channel. All precoding methods benefit from a coordinated bitloading to maximise the spectra within a defined power spectrum density (PSD) mask. Results suggest that THP's superiority is substantial in the fixed cable length scenario whilst the proposed Spatially Adaptive Generalised ZFP (SA-GZFP) outperforms the latter marginally in the dendritic one. The paper further suggests that a spatially adaptive nonlinear precoder may have the potential of combining the gains of THP and Maximal Ratio Transmission (MRT) for greater system performance.

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More information

Published date: 20 February 2019
Venue - Dates: 2018 IEEE Global Communications Conference, GLOBECOM 2018, United Arab Emirates, 2018-12-09 - 2018-12-13

Identifiers

Local EPrints ID: 430120
URI: http://eprints.soton.ac.uk/id/eprint/430120
ISSN: 2576-6813
PURE UUID: 66c63ba3-50e5-4a5a-acd1-2afcc3e56c1b

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Date deposited: 12 Apr 2019 16:30
Last modified: 21 Jan 2020 17:30

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Contributors

Author: Liam Stigant
Author: Rong Zhang
Author: Leslie D. Humphrey
Author: Trevor P. Linney
Author: Trevor Morsman
Author: Anas F. Al Rawi

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