Method and apparatus for decoding error correction code
US4719628A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1985 |
| Grant date | Jan 12, 1988 |
| Priority date | — |
| Expiry date | Aug 19, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/1515
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a method for decoding an error correction code in which a first correction code of (n.sub.1, k.sub.1) (where n.sub.1 denotes the code length) is encoded for every k.sub.1 information symbols arranged in each column and a second error correction code of (n.sub.2, k.sub.2) (where n.sub.2 denotes the code length) are encoded for every k.sub.2 information symbols arranged in each row of a two dimensional arrangement of (k.sub.1 .times.k.sub.2), a first pointer formed by decoding the first error correction code is stored in a memory having n.sub.2 bits, a second pointer formed by decoding the second error correction code is stored in a memory having k.sub.2 bits, reliability of the information symbols is evaluated on the basis of status of the first and second pointers when the information symbols is outputted. In the case when the second error correction code is decoded, an erasure correction may be made with respect to each of the code series of the second error correction code by employing the first pointer and a part of the calculation for obtaining an error value in this erasure correction may be carried out only once with respect to each of the code series of the second error c…
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