Satellite Media Broadcasting with Adaptive Coding and Modulation

Table 1

MODCOD combinations used.

MODCOD no.	Constellation	FEC Code rate	Operating threshold (dB)	Spectral efficiency (bits/symbol)
1	QPSK	1/2	1.0	0.98
2	QPSK	2/3	3.1	1.32
3	QPSK	4/5	4.68	1.58
4	8PSK	3/5	5.5	1.78
5	8PSK	3/4	7.91	2.23
6	8PSK	8/9	10.69	2.64