Optimized correction factor for low-power min-sum low density parity check decoder (LDPC)

摘要

An iterative decoder configured to implement a min-sum with correction algorithm. The iterative decoder includes N parity check nodes coupled to M equality constraint nodes. The iterative decoder further includes a first parity check node configured to send an output to a first equality constraint node. Responsive to a minimum magnitude of other M−1 inputs to the first parity check node being lower than a pre-determined threshold, the parity check node sends the output having a same magnitude as that of the minimum magnitude of the other M−1 inputs to the first parity check node. Responsive to the minimum magnitude of the other M−1 inputs to the first parity check node being greater than the pre-determined threshold, the parity check node subtracts a correction factor in the form of p·2^q from the minimum magnitude.