초록 ▼

A feedback control for a turbo decoder controls the feedback between component decoders of the turbo decoder by substituting either a neutral value or a weighted value for the channel transition probabilities utilized by each component decoder during the iterative decoding process. A control switch

A feedback control for a turbo decoder controls the feedback between component decoders of the turbo decoder by substituting either a neutral value or a weighted value for the channel transition probabilities utilized by each component decoder during the iterative decoding process. A control switch selects either estimated channel transition probabilities, modifications of these values, or neutral values as the channel transition probabilities utilized by the next component decoder in the subsequent decoding iteration.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method for decoding turbo code words, comprising:iteratively calculating forward and backward state probabilities and a posteriori state transition probabilities for component code words of turbo code words according to a MAP decoding process;for each received symbol

[ What is claimed is:] [1.]1. A method for decoding turbo code words, comprising:iteratively calculating forward and backward state probabilities and a posteriori state transition probabilities for component code words of turbo code words according to a MAP decoding process;for each received symbol output by a channel in response to the component code words, selecting either channel transition probability estimates or a modified channel transition probability estimates for calculating the forward and backward state probabilities and the a posteriori state transition probabilities, the selecting step for calculating forward and backward state probabilities being independent of the selecting step for calculating a posteriori state transition probabilities.