ccsds 131.0-b-2

CCSDS RECOMMENDED STANDARD FOR TM SYNCHRONIZATION AND CHANNEL CODINGTable 6-3: Parameters k 1 and k 2 for Specified Information Block LengthsInformation block length k 1 k 21784 8 2233568 8 223 × 27136 8 223 × 48920 8 223 × 52) The following operations shall be performed for s=1 to s=k to obtain permutationnumbers π(s):p 1 = 31; p 2 = 37; p 3 = 43; p 4 = 47; p 5 = 53; p 6 = 59; p 7 = 61; p 8 = 67NOTE – In the equation below, ⎣x⎦ denotes the largest integer less than or equal tox, and p q denotes one of the following eight prime integers:m = (s – 1) mod 2i = s – 12 k 2j = s – 12– i k 2t = (19i + 1) mod k 12q = t mod 8 + 1c = (p q j + 21m) mod k 2π(s) = 2(t + c k 12+ 1) – mThe permutation numbers shall be interpreted such that the sth bit read out on line ‘in b’in figure 6-2 is the π(s)th bit of the input information block, as shown in figure 6-1.CCSDS 131.0-B-2 Page 6-4 August 2011