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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| Veröffentlicht in: | Conference record - Asilomar Conference on Signals, Systems, & Computers S. 1734 - 1738 |
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| Sprache: | Englisch |
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01.11.2015
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| ISSN: | 1058-6393 |
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| Abstract | 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. |
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| AbstractList | 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. |
| Author | Kerpez, Ken Mohseni, Mehdi |
| Author_xml | – sequence: 1 givenname: Mehdi surname: Mohseni fullname: Mohseni, Mehdi email: mmohseni@assia-inc.com organization: ASSIA, Inc., Redwood City, CA, USA – sequence: 2 givenname: Ken surname: Kerpez fullname: Kerpez, Ken email: kkerpez@assia-inc.com organization: ASSIA, Inc., Redwood City, CA, USA |
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| Snippet | 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... |
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| SubjectTerms | Algorithms Approximation Bandwidth Broadband Computer simulation Convex functions Crosstalk DSL G.fast Mathematical models Nonlinearity Optimization precoder Signal processing vectoring |
| Title | Signal processing for G.fast |
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