5.1a.2 General descriptions of interleaving functions

3GPP45.003GSM/EDGE Channel codingRelease 17TS

5.1a.2.1 Interleaver type 1

Given a block of N_C bits, {c(0),…,c(N_C-1)} and the parameter a, interleaving is performed according to the following rule:

i(j) = c(k) for k = 0,1,…, N_C-1

j = N_CB/4 + (((k div 4)+(N_C div 16)B)a mod N_C/4)

B = 2(k mod 2) + (k mod 4) div 2

This results in a block of N_C bits {i(0),…,i(N_C-1)}.

5.1a.2.2 Interleaver type 2

Given a block of N_C bits, {c(0),…,c(N_C-1)} and the parameter a, interleaving is performed according to the following rule:

i(j) = c(k) for k = 0,1,…, N_C-1

j = ka mod N_C

This results in a block of N_C bits {i(0),…,i(N_C-1)}.