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Table 2 The types and numbers of operations needed to implement the perfect scrambling (randomly generated), FF soft decoding (BCJR), and FF hard decoding (as perfect scrambling)

From: Pre-coded LDPC coding for physical layer security

Operations Perfect scrambling FF soft FF hard decoding
  (random matrix) (BCJR) (perfect scrambling)
Addition n(n−1) 2(2t−1)n n−1
Multiplication n 2 8t n  
Division   n  
Logarithm   n