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1. (WO2004098068) ACS APPARATUS AND METHOD FOR VITERBI DECODER

Pub. No.:    WO/2004/098068    International Application No.:    PCT/GB2004/001770
Publication Date: 2004. 11. 11 International Filing Date: 2004. 4. 27
IPC: H03M 13/41
Applicants: ANALOG DEVICES BV
CARAMMA, Marcello
Inventors: CARAMMA, Marcello
Title: ACS APPARATUS AND METHOD FOR VITERBI DECODER
Abstract:
The circuit (10) performs a butterfly calculation for a Viterbi trellis by using two path metrics and a branch metric to generate two new path metrics. The new metrics are produced by adders (12) and (14) whose inputs are controlled by selectors (16-22). The outputs of the selectors (16-22) are controlled by selection control unit (24) which considers the difference between the given path metrics relative to the double of the branch metric, which represents a branch metric difference.