Table 1: MODCOD combinations used.

MODCOD no.ConstellationFEC Code rateOperating threshold (dB)Spectral efficiency (bits/symbol)

1QPSK1/21.00.98
2QPSK2/33.11.32
3QPSK4/54.681.58
48PSK3/55.51.78
58PSK3/47.912.23
68PSK8/910.692.64