×

Turbo code decoder with modified systematic symbol transition probabilities

  • US 6,263,467 B1
  • Filed: 08/20/1998
  • Issued: 07/17/2001
  • Est. Priority Date: 08/20/1998
  • Status: Expired due to Term
First Claim
Patent Images

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.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×