Coding technique in discrete multi-tone (DMT) based communications systems
US6580761B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Apr 26, 2001 |
| Grant date | Jun 17, 2003 |
| Priority date | — |
| Expiry date | Jun 15, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2624
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In an Asymmetric Digital Subscriber Loop (ADSL) Discrete Multi-Tone (DMT) system, ADSL DMT equipment includes an encoder that operates on a DMT input signal representing ƒ symbols/sec. to generate, for transmission, a DMT output signal representing Nƒ symbols/sec., where N>1, and where each symbol from the DMT input signal is generated in a redundant form in the DMT output signal. In one example of a redundant form, each symbol from the DMT input signal is repeated in N consecutive symbol intervals in the DMT output signal. In another example of a redundant form, every N DMT input symbol values are transmitted in 2N consecutive symbol intervals in the DMT output signal. These 2N consecutive symbols in the DMT output signal include 1) N symbols whose values equal the respective N DMT input symbol values and 2) N symbols whose values are a function of the respective N DMT input symbol values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.