Soft-decision decoding of convolutionally encoded codeword

Details Soft-decision decoding of convolutionally encoded codeword Soft-decision decoding of convolutionally encoded codeword

2006-02-14

2006-02-14

Corrielus, Jean B. (Department: 2637)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S262000, C375S265000, C714S794000, C714S795000, C714S796000, C714S792000

Reexamination Certificate

active

06999531

ABSTRACT:
A method and apparatus for decoding convolutional codes used in error-correcting circuitry for digital data communication. To increase the speed and precision of the decoding process, the branch and/or state metrics are normalized during the soft decision calculations, whereby the dynamic range of the decoder is better utilized. Another aspect of the invention relates to decreasing the time and memory required to calculate the log-likelihood ratio by sending some of the soft decision values directly to a calculator without first storing them in memory.

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