4 16 8

0	1	2	3
4	5	6	7
8	9	10	11
12	13	14	15
0	1	2	3
4	5	6	7
8	9	10	11
12	13	14	15
0	1	2	3
4	5	6	7
8	9	10	11
12	13	14	15
0	1	2	3
4	5	6	7
8	9	10	11
12	13	14	15


0	4	2	6
1	5	3	7
4	0	6	2
5	1	7	3
2	6	0	4
3	7	1	5
6	2	4	0
7	3	5	1
4	0	6	2
5	1	7	3
0	4	2	6
1	5	3	7
6	2	4	0
7	3	5	1
2	6	0	4
3	7	1	5

This is the rate 2/3 Ungerboeck code with 16 states for 8-PSK (natural mapping).
The states are defined in Ungerboeck's way. 

d_free^2 =  2.274^2 Es --> 7.13 dB (so gain of 4.13 dB over uncoded QPSK)

Parity check matrix in octal: [16 04 23] 

Generator Matrix:

[ D	1+D+D^2	0
  1+D^2	D^2	D]