Error trapping decoding method and apparatus
US5107506A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1990 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Jan 25, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/15
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An error correction system generates a residue for data symbols encoded in accordance with an (n,k) code which has a distance "d" and a generator polynomial g(x). If the residue contains fewer than "T" non-zero symbols, where T<d/2, the data symbols are assumed to be error free. If there are T or more non-zero symbols, the data symbols are assumed to contain errors and the residue symbols are manipulated to correct the errors, if possible. The residue symbols are thus encoded using an encoder constructed in accordance with the generator polynomial g(x) by loading the residue symbols and shifting the encoder "m" times, where m is a factor of k. The number of non-zero symbols are then counted. If there are fewer than T non-zero symbols in the encoded residue, the encoded symbols are combined with the corresponding symbols in the code word. Thus the first encoded residue symbol is combined with the m.sup.th code word symbol, the second residue symbol is combined with the m+1.sup.st code word symbol, et cetera. If there are more than T non-zero symbols, the residue symbols are again encoded by shifting the encoder another m times, and so forth. The encoder may include feedback paths wh…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.