Modified branch metric calculator to reduce interleaver memory and improve performance in a fixed-point turbo decoder
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United States of America Patent
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Jun 5, 2012
Grant Date -
Mar 19, 2009
app pub date -
Nov 26, 2008
filing date -
Aug 26, 2005
priority date (Note) -
Expired
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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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