Decoding techniques for correcting errors using soft information
US7725800B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 2005 |
| Grant date | May 25, 2010 |
| Priority date | — |
| Expiry date | Mar 3, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/4146
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Two levels of error correction decoding are performed using first and second level decoders. A composite code formed by combining an inner component code and an outer component code can be used to decode the data and correct any errors. Performing two level decoding using a composite code allows the size of the inner parity block to be reduced to a single Reed-Solomon symbol while keeping a good code rate. The first level decoder generates soft information. The soft information can indicate a most likely error event for each possible syndrome value of the inner component code. The soft information can also include error metric values for each of the most likely error events. The second level decoder generates corrected syndrome values based on the soft information using the outer component code. The most likely trellis path that corresponds to the corrected syndrome values is then selected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.