Soft-input generation for soft-decision FEC decoding
US8705664B2 · kind B2 · utility
1Cited by
5References
30Claims
0Family size
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Key dates
| Filing date | Aug 8, 2011 |
| Grant date | Apr 22, 2014 |
| Priority date | — |
| Expiry date | Feb 24, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03057
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A soft-decision forward error correction scheme for received optical signals is described. Differential decoding may be performed, for example, in each polarization after coherent QPSK detection. Hard decisions may be made based on judging the most likely transition between each pair of received input symbols. Soft-input generation is also described, representing the reliability of the hard decisions. The soft-input information may be generated through simplified algorithms that utilize the most likely transitions to determine a reliability assignment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.