Maximum likelihood error correcting technique
US4462101A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1982 |
| Grant date | Jul 24, 1984 |
| Priority date | — |
| Expiry date | Mar 5, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0069
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A maximum likelihood error correcting technique for a digital communication in which a transmit side provides coded data with some redundancy through a convolutional coding circuit, and a receive side corrects transmission errors automatically through a maximum likelihood error correcting circuit has been improved by deleting some symbols at a transmit side to increase a coding rate close to 1, and inserting dummy symbols at a receive side into each bit position where a symbol has been deleted at a transmit side. A likelihood value for that dummy symbol inserted at a receive side for the maximum likelihood decoding is a fixed predetermined value. Thus, both a coding circuit in a transmit side and a decoding circuit in a receiving circuit have only to handle original low rate code, while keeping a coding rate in a transmission line high. Then, the codec for high rate code obtained merely by adding the simple circuits to the simple codec for low rate code provides an excellent error correcting capability compared with other conventional error correcting techniques of the same coding rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.