Methods and apparatus for defect detection and correction via iterative decoding algorithms

摘要

In iterative decoding, a data recovery scheme corrects for corrupted or defective data by determining reliability metrics for blocks of decoded data. Block or windowed detectors generate block reliability metrics for data blocks (rather than individual bits) of decoded data using soft information from the regular decoding mode or from new iterative decoding iterations performed during error recovery mode. An error recovery system triggers corrective decoding of selected data blocks based on the block reliability metrics, by for example, comparing the block reliability metrics to a threshold or by selecting an adjustable number of the least reliable data blocks.

主权项

1. A method for detecting a defect in a decoded data block, said method comprising:
computing a plurality of degrees of unsatisfied checks associated with said data block; calculating a block reliability metric for said decoded data block based on said plurality of degrees of unsatisfied checks; and detecting a defect in said decoded data block based on a comparison between said block reliability metric and a threshold.