Table B-2. Turbo Product Coding Summary - Comtech EF Data CDD-562L Installation And Operation Manual

CDD-562L/564 Demodulator with IP Module
Appendix B
B.2.3 Comparison of All TPC Modes (Contains Additional Information)
Mode
QPSK
Rate 3/4 Turbo
QPSK
Rate 0.95 Turbo
8-PSK Rate 3/4 Turbo
8-PSK Rate 0.95 Turbo
16-QAM Rate 3/4 Turbo
The additional advantages of Turbo – lower delay, performance during fades, etc. – should also
be considered.
•
Exceptionally good BER performance – significant
improvement compared with every other FEC method in
use today
•
No pronounced threshold effect – fails gracefully
•
Exceptional bandwidth efficiency
•
Coding gain independent of data rate (in this
implementation)
•
Low decoding delay
•
Easy field upgrade
Eb/No at Eb/No at
BER = 10 BER = 10
-6
Guaranteed Guaranteed
(Typical in (Typical in
parentheses) parentheses)
3.8 dB 4.4 dB
(3.4 dB) (4.0 dB)
6.4 dB 6.9 dB
(6.0 dB) (6.5 dB)
6.2 dB 6.8 dB
(5.8 dB) (6.3 dB)
9.3 dB 10.3dB
(8.9 dB) (9.9 dB)
7.4 dB 8.2 dB
(7.0 dB) (7.7 dB)

Table B-2. Turbo Product Coding Summary

FOR
B–3
-8
Spectral
Symbol Rate
Efficiency
1.50 bits/Hz 0.67 x bit rate
1.90 bits/Hz 0.53 x bit rate
2.25 bits/Hz 0.44 x bit rate
2.85 bits/Hz 0.35 x bit rate
3.00 bits/Hz 0.33 x bit rate
AGAINST
Nothing!
Revision 2
MN/CDD564L.IOM
Occupied
Bandwidth
for 1 Mbps
Carrier
793 kHz
626 kHz
529 kHz
377 kHz
396 kHz