Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Reexamination Certificate
2005-03-08
2005-03-08
Chase, Shelly A (Department: 2133)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
Reexamination Certificate
active
06865710
ABSTRACT:
The present invention discloses a butterfly processor capable of performing convolutional decoding and LogMAP decoding in telecommunications systems. First and second add-compare-select modules are provided for receiving input path metrics. A branch metric calculator is also provided for receiving input data and extrinsic data. The branch metric calculator generates output branch metrics to each of the first and second add-compare-select modules. Each of the add-compare-select modules includes a log-sum correction means coupled to compare and select components. A controllable switch selectively couples outputs of the select components and the log-sum corrections means to enable either one of convolutional or LogMAP decoding.
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Bickerstaff Mark Andrew
Nicol Christopher J.
Xu Bing
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