Abstract:
A data processing system is disclosed including a low density parity check decoder with a variable node processor, a check node processor and a scaler circuit. The low density parity check decoder is operable to scale soft information with a scaling factor in the scaler circuit while iteratively generating and processing check node to variable node messages in the variable node processor and variable node to check node messages in the check node processor between a plurality of check nodes and variable nodes. The scaling factor is derived from a distribution of possible values in an input to the low density parity check decoder.
Abstract:
A layered LDPC decoder sorts and selects a subset of message entries for processing based on entry size. MIN1 and MIN2 values for each message entry in the subset are truncated, and either the truncated values or non-truncated values are combined with a symbol vector based on whether the subset of message entries includes a variable node associated with the layer being processed.