Never discard information prematurely that may be useful in making a decision until after all decisions related to that information have been completed.
Hard Decoding, Soft Decoding
“Soft” decoding refers to the use of probabilistic information as input to a decoding algorithm, whereas “hard” decoding use a sequence of symbols (e.g., bits).
ADE 
posting ttg soft decoding lebih lanjut mas. oya, ldpc decoder masukkannya harus soft ato hard?
LDPC soft decoding, masukannya softbit.
Hmm… insyaAlloh postingannya menyusul :p