LDPC Decoder with an Adaptive Wordwidth Datapath for Energy and BER Co-Optimization

Algorithm 2

Split-Row Low Power Threshold Algorithm—Variable Node Processing.

Required: 𝜆, that is, channel information

 Iteration = 1

 while  𝐻⋅𝑉^𝑇≠0  do

  𝐿𝑜𝑤𝑝𝑜𝑤𝑒𝑟_𝑓𝑙𝑎𝑔= (𝐼𝑡𝑒𝑟𝑎𝑡𝑖𝑜𝑛≤𝐿𝑜𝑤_𝑃𝑜𝑤𝑒𝑟_𝐼𝑡𝑒𝑟𝑎𝑡𝑖𝑜𝑛)

  for  𝑗=0,1,…,𝑁−1  do

   if  Lowpower_flag = 0 then

    𝑖^′∈𝐶𝑗⧵𝑖

   else

    𝑖^′∈𝐶(𝑗)

   end if

   for all  𝑖^′  do

         𝛽_𝑖𝑗=𝜆_𝑗+∑_𝑖′𝛼_𝑖′𝑗(1)

   end for

  end for

  do Algorithm 1

  Iteration = Iteration + 1

 end while