Patent ID: 11881869
Assignee: SK HYNIX INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. The method of claim 4, wherein the first channel LLR at a beginning of stage (s+1) is determined as:, l
      ˆ
     
     
      (
      
       s
       +
       1
      
      )
     
    
    (
    0
    )
   
   =
   
    ln
    ⁡
    (
    
     
      
       
        
         ❘
         "\[LeftBracketingBar]"
        
        
         I
         ⁡
         (
         0
         )
        
        
         ❘
         "\[RightBracketingBar]"
        
       
       -
       
        C
        
         I
         ⁡
         (
         0
         )
        
        
         (
         s
         )
        
       
      
      
       C
       
        I
        ⁡
        (
        0
        )
       
       
        (
        s
        )
       
      
     
     ×
     
      
       
        C
        
         I
         ⁡
         (
         0
         )
        
        
         (
         s
         )
        
       
       +
       
        C
        
         I
         ⁡
         (
         1
         )
        
        
         (
         s
         )
        
       
      
      
       n
       -
       
        C
        
         I
         ⁡
         (
         0
         )
        
        
         (
         s
         )
        
       
       -
       
        C
        
         I
         ⁡
         (
         1
         )
        
        
         (
         s
         )
        
       
      
     
    
    )
   
  
  ,
 

wherein:
s represents a stage,
in represents the natural logarithm function,
I(0)={i∈[1, n]|yi=0} is a first set of indices {i} for which a bit yi of the noisy codeword is equal to zero and I(1)={i∈[1, n]|y=1} is a second set of indices {i} for which the bit yi of the noisy codeword is equal to one,
n is an integer length of the noisy codeword, and
CI(0)(s) and CI(1)(s) are a number of positions in the hard decision of the noisy codeword at an end of the stage s equal to 1 in I(0) and I(1), respectively.