Adaptive reliability calculation for block turbo codes

Shortening and turbo decoding of product codes

“…This shows that besides producing increased d mm faster (with smaller s), the ordered shortening scheme is also able to produce smaller Ad values for the smaller d terms. Note also that although the A 4 value in s-Hamming(18,13) of ordered shortening is larger, the A\2 value in s-PC(18,13)" of ordered shortening is smaller. This is because the An value of s-PC( 18,13) 2 is contributed by both the A3 and A4 values of s-Hamming( 18,13).…”

“…(18,13) .conventional shortening s-PC(1 Q ^f .ordered shortening I Comparison of Aj between ordered and conventional shortening for (a) s-Hamming( 18,13)and(b)s-PC(18,13) 3a shows that the proposed ordered shortening scheme produces s-Hamming(18,13) with smaller Ad values than conventional shortening for d = 3 and 5. This is also true for s-PC(18,13) as shown inFig. 4.3b, for all values of d = 9, 12 and 15.…”