Error correction coding method and apparatus for multilevel signaling
US4346473A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1980 |
| Grant date | Aug 24, 1982 |
| Priority date | — |
| Expiry date | Feb 26, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/2383
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In typical error correction coding techniques for use in multilevel signalling schemes, such as M-level QAM signalling, the full data stream is encoded. In order to eliminate the need for such extensive coding while still allowing for accurate decisions as to the received data, the present system and method provide techniques for only encoding the lower significance bits of the multi-bit signal. The more significant bits are left uncoded. Accurate decisions are still possible in the majority of cases with this technique inasmuch as the most likely errors in uncoded transmission occur in deciding between adjacent received signal levels. These errors are eliminated by encoding the lower significance bits without the need for encoding the more significant bits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.