Signal processing for G.fast

The first version of G.fast occupies frequencies up to 106 MHz and uses relatively simple linear channel-inverting matrix precoders to cancel the crosstalk in a multi-pair telephone cable. However, to truly deliver Gbps+ data rates to most customers, even higher frequencies should be used; where the...

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Vydané v:Conference record - Asilomar Conference on Signals, Systems, & Computers s. 1734 - 1738
Hlavní autori: Mohseni, Mehdi, Kerpez, Ken
Médium: Konferenčný príspevok.. Journal Article
Jazyk:English
Vydavateľské údaje: IEEE 01.11.2015
Predmet:
Algorithms
Approximation
Bandwidth
Broadband
Computer simulation
Convex functions
Crosstalk
DSL
G.fast
Mathematical models
Nonlinearity
Optimization
precoder
Signal processing
vectoring
ISSN:1058-6393
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Shrnutí:The first version of G.fast occupies frequencies up to 106 MHz and uses relatively simple linear channel-inverting matrix precoders to cancel the crosstalk in a multi-pair telephone cable. However, to truly deliver Gbps+ data rates to most customers, even higher frequencies should be used; where the crosstalk can be stronger than the signal, and so more advanced non-linear signal processing is envisioned. This paper derives optimum signal processing structures for G.fast crosstalk cancelling precoders, and compares approximate and optimum linear and non-linear structures for G.fast running up to 212 MHz. The optimum linear and non-linear precoders are derived. Simulations compare the performance of optimum and QR-decomposition based non-linear precoders, and find that the QR-decomposition with Tomlinson-Harishima precoding is practically optimal. An algorithm is shown for maximizing the minimum bit rate for line ordering of nonlinear precoders; this algorithm is shown to have max-min performance near the optimum.
Bibliografia:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Conference-1
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SourceType-Conference Papers & Proceedings-2
ISSN:1058-6393
DOI:10.1109/ACSSC.2015.7421447