From: Improved synchronization, channel estimation, and simplified LDPC decoding for the physical layer of the DVB-T2 receiver
K LDPC
N LDPC
R= Rcode
Q LDPC
32400
64800
1/ 2
90
38880
3/5
72
43200
2/3
60
48600
3/4
45
51840
4/5
36
54000
5/6
30