| 摘要 |
The present invention proposes a new stopping criterion for a turbo-encoding method. This criterion is based on a state metrics calculated by the forward backward recursion in the coding trellis of an elementary encoder. If, for at least one elementary decoding stage (610p), the forward state metrics of the last symbol of the block or the backward state metrics of the first symbol of the block exceeds a first threshold (612), the turbo-decoding iterations are stopped. If it is not the case, it is further checked (613) whether the state metrics exceeds a second threshold and if the absolute value of the difference between the current state metrics and the state metrics obtained at the previous iteration lies below a given margin. In the affirmative, the turbo-decoding iterations are stopped and a hard decision is taken on the extrinsic values (614). |
