Safran CORTEX CRT Quantum User Manual page 154

Note 1: decoded frames are available on TCP/IP port without synchronization word systematically.
The number of iteration is Bit rate dependant. It could be estimated by the formula:
The Payload block size is set through the Frame/block size parameter. If LDPC decoding is turned on (i.e.
LDPC RATE = 1/2, 2/3, 4/5, 7/8), this parameter is read as a number of bits. If the Payload block size does not
correspond to CCSDS standard, it will cause an alarm.
Note 2: The bad frame counter signal is just an indicator and is not considered to be exact. The additional CRC
mechanism has to be activated in order for this counter to be exact. (See section 3.3.9 Frame Verification)
CRT LDPC BER performance compared to CCSDS
0.01E+00
1.00E-03
0.10E-03
0.01E-03
1.00E-06
0.10E-06
0.01E-06
1.00E-09
0.10E-09
0.01E-09
0.1
Figure 35: CRT LDPC BER performance compared to CCSDS (r=1/2, k=4096)
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
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Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
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