Decoder utilizing soft information output to minimize error rates
US5968198A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1996 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Aug 16, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/1816
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A coding system is disclosed wherein the receive side includes a decoder capable of producing, in addition to the hard information decoded output, either or both symbol and/or bit soft information values. For a certain information bit position, a value proportional to the joint probability that a received symbol and the set of all hypothesized transmitted codewords that led to the estimated or detected hard information output is calculated. The calculated probabilities with respect to plural codewords having a zero in that certain information bit position are compared to the calculated probabilities with respect to the plural codewords having a one in that certain information bit position. The result of the comparison provides an indication of whether the hard information output in that same information bit position is more likely a one or a zero. The output soft information values are further processed in comparison to a preset threshold, with instances exceeding the threshold triggering block rejections and/or retransmissions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.