Method and apparatus for non-linear scaling of log...

Details Method and apparatus for non-linear scaling of log... Method and apparatus for non-linear scaling of log...

Filed on

2005-09-29

Date issued

2009-06-30

Examiner

Corrielus, Jean B (Department: 2611)

Patent Class

Pulse or digital communications

SubClass

Receivers

SubSubClass

Particular pulse demodulator or detector

Other Related Categories

C375S262000, C714S755000, C714S794000

Type

Reexamination Certificate

Status

active

Patent number

07555071

Description

ABSTRACT:
Methods and apparatus are provided for non-linear scaling of log likelihood ratio (LLR) values in a decoder. A decoder according to the present invention processes a received signal by generating a plurality of log-likelihood ratios having a first resolution; applying a non-linear function to the plurality of log-likelihood ratios to generate a plurality of log-likelihood ratios having a lower resolution; and applying the plurality of log-likelihood ratios having a lower resolution to a decoder. The non-linear function can distribute the log-likelihood ratios, for example, such that the frequency of each LLR value is more uniform than a linear scaling.

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patent: 2005/0120286 (2005-06-01), Akamatsu
patent: 2005/0129147 (2005-06-01), Cannon et al.
patent: 2007/0127605 (2007-06-01), Sindhushayana
Wu et al., “The Influence of Quantization and Fixed Point Arithmetic Upon the Ber Performance of Turbo Codes,” IEEE, pp. 1683-1687 (1999).

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