High-speed turbo decoder

Pulse or digital communications – Receivers – Particular pulse demodulator or detector

Reexamination Certificate

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C714S780000, C714S755000

Reexamination Certificate

active

07133472

ABSTRACT:
A high-speed turbo decoder using a BCJR (Bahi, Cocke, Jelinek, and Raviv) algorithm or a BCJR algorithm which makes approximation by ACS computation (Add-Compare-Select computation) includes a supplier for supplying a plurality of pipelined stages of gamma metrics as a section for performing at least one of alpha metric computation and beta metric computation in the BCJR algorithm, an ACS computation portion which is constituted by a plurality of stages of cascade connections and receives the plurality of pipelined gamma metrics, a receiver that receives a computation result obtained by the ACS computation portion and updates state metrics every plurality of stages (K stages), and a memory for storing state metrics for every K stages.

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