Method and apparatus for performing soft demapping in rotated quadrature amplitude modulation (QAM) based communication system
US9246724B2 · kind B2 · utility
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35Claims
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Key dates
| Filing date | Mar 7, 2014 |
| Grant date | Jan 26, 2016 |
| Priority date | — |
| Expiry date | Mar 7, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/38
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A soft demapping apparatus and method thereof includes a pre-processing unit to pre-process a reception signal obtained from a symbol representing bits. A candidate selection unit selects two candidates from among constellation points included in a constellation for each of the bits. A distance calculation unit calculates a Euclidean distance between the reception signal and the two candidates. A log-likelihood ratio (LLR) calculation unit calculates an LLR with respect to the bits based on the Euclidean distance between the reception signal and the two candidates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.