Soft Decision LDPC Decoder With Improved LLR From Neighboring Bits

A method of providing, by a controller, a log likelihood ratio (LLR) to a low-density parity check (LDPC) decoder, the method comprising storing, in a non-volatile memory controller, a look-up table for storing LLR values of at least one bit representing a charge state of a cell of the plurality of cells in the memory. The controller determines a cell charge state of the target cell, calculates a value representative of the difference in charge states of the target cell and at least one of a plurality of neighboring cells. The controller compares the calculated value with at least one predetermined threshold value, and sets at least one address bit of an address to the look-up table if the calculated value exceeds the at least one threshold value. The controller extracts a new LLR value from the look-up table, and provides the new LLR value to the LDPC decoder.