Method of QAM soft demapping
US7876846B2 · kind B2 · utility
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Key dates
| Filing date | Mar 28, 2007 |
| Grant date | Jan 25, 2011 |
| Priority date | — |
| Expiry date | Oct 15, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/38
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of demapping in a receiver including deriving M intermediate soft bit values yj for the I and Q data of the input signal as a function of the spacing in the constellation; and limiting the range of the M values yj. A look-up table index is derived for each of the limited M values yj. A look-up table, having 2N+1 entries for supporting up to N soft bit outputs, is indexed using the derived indices; and K soft bits for each of the M values yj of the I and Q data are outputted.
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