Filter
Top Products
CDM-600 Satellite Modem Revision 7
Forward Error Correction Options MN/CDM600.IOM
7–8
It is clear that in order to provide the best possible performance over the range of code rates
from 1/2 to 0.95, both an LDPC and a TPC codec need to be offered.
In order to meet this requirement, Comtech EF Data has developed a combination
LDPC/TPC Codec module that can be added to the CDM-600 Modem, and which provides
the following operating modes:
Table 7-5. Available TPC and LDPC Modes
TPC Code Rate/Modulation Data Rate Range
Rate 21/44 BPSK 4.8 kbps to 3.2 Mbps (to 4.772 Mbps with High Rate Turbo card)
Rate 5/16 BPSK 4.8 kbps to 2.048 Mbps (to 3.12 Mbps with High Rate Turbo card)
Rate 1/2 QPSK, OQPSK 4.8 kbps to 9.54 Mbps (High Rate Turbo card only)
Rate 3/4 QPSK, OQPSK 7.2 kbps to 5.0 Mbps (to 15 Mbps with High Rate Turbo card)
Rate 3/4 8-PSK 10.8 kbps to 5.0 Mbps (to 20 Mbps with High Rate Turbo card)
Rate 3/4 16-QAM 14.4 kbps to 5.0 Mbps (to 20 Mbps with High Rate Turbo card)
Rate 7/8 QPSK, OQPSK 8.4 kbps to 17.5 Mbps (High Rate Turbo card only)
Rate 7/8 8-PSK 12.6 kbps to 20 Mbps (High Rate Turbo card only)
Rate 7/8 16-QAM 16.8 kbps to 20 Mbps (High Rate Turbo card only)
Rate 0.95 QPSK, OQPSK 9.1 kbps to 18.888 Mbps (High Rate Turbo card only)
Rate 0.95 8-PSK 13.6 kbps to 20 Mbps (High Rate Turbo card only)
LDPC Code Rate/Modulation Data Rate Range
Rate 1/2 BPSK 4.8 kbps to 5.0 Mbps (TPC/LDPC Codec card only)
Rate 1/2 QPSK, OQPSK 4.8 kbps to 10.0 Mbps (TPC/LDPC Codec card only)
Rate 2/3 QPSK, OQPSK 6.4 kbps to 13.3 Mbps (TPC/LDPC Codec card only)
Rate 2/3 8-PSK , 8-QAM 9.6 kbps to 19.0 Mbps (TPC/LDPC Codec card only)
Rate 3/4 QPSK, OQPSK 7.2 kbps to 15.0 Mbps (TPC/LDPC Codec card only)
Rate 3/4 8-PSK , 8-QAM 10.8 kbps to 20.0 Mbps (TPC/LDPC Codec card only)
Rate 3/4 16-QAM 14.4 kbps to 20.0 Mbps (TPC/LDPC Codec card only)