Max-Log-MAP equivalence log likelihood ratio generation soft Viterbi architecture system and method
US9450618B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2014 |
| Grant date | Sep 20, 2016 |
| Priority date | — |
| Expiry date | Aug 24, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/3905
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A modified soft output Viterbi algorithm (SOVA) detector receives a sequence of soft information values and determines a best path and an alternate path for each soft information value and further determines, when the best and alternate paths lead to the same value for a given soft information value, whether there is a third path departing from the alternate path that leads to an opposite decision with respect to the best path for a given soft information value. The SOVA detector then considers this third path when updating the reliability of the best path. The modified SOVA detector achieves max-log-map equivalence effectively through the Fossorier approach and includes modified reliability metric units for the first N stages of the SOVA detector, where N is the memory depth of a given path, and includes conventional reliability metric units for the remaining stages of the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.