Methods, apparatus, and systems for determining 1T state...

Details Methods, apparatus, and systems for determining 1T state... Methods, apparatus, and systems for determining 1T state...

2011-01-25

2011-01-25

Burd, Kevin M (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

Reexamination Certificate

active

07876861

ABSTRACT:
Methods, apparatus, and systems for generating bit-wise reliability information using a soft output Viterbi algorithm (“SOVA”) in an nT Viterbi decoder implementation devoid of 1T metric information. At each nT clock pulse 1T equivalent metric values are determined from the current nT metric information. 1T equivalent metric information is determined as values that sum to the corresponding nT metric information. Subtraction is then used to determine state metric difference information from the 1T equivalent metric values. The state metric difference information may then be used to estimate log likelihood ratio information for use in the SOVA algorithm to determine bit-wise reliability information.

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Yeo, Engling et al.;500Mb/s Soft Output Viterbi Decoder; IEEE Journal of Soild-State Circuits; Jul. 2003; pp. 1234-1241.

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