Modified branch metric calculator to reduce interleaver memory and improve performance in a fixed-point turbo decoder
US8196006B2 · kind B2 · utility
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Key dates
| Filing date | Nov 26, 2008 |
| Grant date | Jun 5, 2012 |
| Priority date | — |
| Expiry date | Mar 12, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/3927
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A turbo decoder that calculates alpha, beta and gamma (branch metric) values does not normalize the branch metric but instead applies the normalization factor to the newly calculated extrinsic values before writing them to interleaving memory, resulting in use of less memory than in prior turbo decoders. A compensating factor is applied when the extrinsics are read from interleaving memory. The absence of normalization in the gamma calculation not only conserves memory but also enhances decoder sensitivity.
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