| 摘要 |
PURPOSE: A viterbi decoder is provided to improve a reliability by simply and quickly detecting a synchronization of the viterbi decoder through an improvement of a structure. CONSTITUTION: A viterbi decoder comprises a signal alignment controller(100) aligning coded signals, a branch metric calculation part(200) calculating a branch metric in each state, an ACS(Add, Compare and Select) part(300) selecting an optimum path through a calculation of a path metric in each state, a minimal path metric selection part(400) deciding a minimal path metric state among the path metrics supplied from the ACS part(300), a state connection detecting part(500) deciding two minimal path metric states and determines whether capable of connecting or not, and a synchronization decision part(600) deciding a state and determines whether synchronized or not using the information of the state connection detecting part(500).
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