Methods for the determination of FEC parameters in DMT based xDSL systems in the presence of system imposed constraints
US7600178B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 12, 2005 |
| Grant date | Oct 6, 2009 |
| Priority date | — |
| Expiry date | Jun 15, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/1515
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention provides procedures for computing Forward Error Correction (FEC) parameters given a set of constraints on maximum interleaver memory, maximum interleaver depth, maximum codeword size, maximum number of check bytes, maximum number of FEC codewords per Discrete Multi-Tone (DMT) symbol, and minimum number of DMT symbols that the FEC must correct, as well as any constraints imposed by the interleaver. These procedures are implemented on a computational engine in a modem, enabling it to achieve optimal performance in all cases. In addition these procedures can be applied as part of any bit loading algorithm to determine the optimal FEC parameters, taking into account the Signal-to-Noise Ratio (SNR) profile, the FEC coding gain, the constraints of the framer, and any application specific constraints.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.