DekTec DTM-3237 DVB-S2 Receiver - Manual (Page 23)

DTM-3237 – OEM DVB-S2 Receiver with DVB-ASI Output
User Manual
23
4.5.7 Receiver statistics
In DVB-S2, the pre-LDPC BER is the bit error rate before the receiver has applied any error correction.
For the DTM-3237 it is be computed from the MER using formulas. These formulas have been
validated using DekTec’s advanced demodulator simulation software (this software has been used
amongst others in the DVB working groups for the definition of DVB-T2 and DVB-C2). The
correspondence between theoretical and measured values is very good.
The E
s
/N
0
is computed from the MER under the assumption that the noise distribution is Gaussian
(AWGN channel), as under these circumstances E
s
/N
0
and MER are identical. The E
b
/N
0
is computed
from the E
s
/N
0
for constant modulated (CCM) streams only.
Manageable Items – Category 0x92 – Receiver statistics
Nr Variable Description Access Type
0x00 All All settings in this category RO 72 bytes
0x01 RF power-level RF power-level for channel bandwidth
in 0.1 dBmV units
INT_MIN = Unknown or not locked
RO int32
0x02 SNR Signal-over-noise ratio in 0.1 dB units
INT_MIN = Unknown or not locked
RO int32
0x03 MER Modulation-error-rate in 0.1 dB units
INT_MIN = Unknown or not locked
RO int32
0x04 E
s
/N
0
Energy per symbol per noise power
spectral density in 0.1 dB units
INT_MIN = Unknown or not locked
RO int32
0x05 E
b
/N
0
Energy per bit to noise power spectral
density ratio in 0.1 dB units
INT_MIN = Unknown or not locked
INT_MIN + 1 = N/A for ACM streams
RO int32
0x06 Link margin Difference in dB between C/N of the
received signal and the C/N at which
the receiver cannot demodulate the
signal any more in 0.1dB units
INT_MIN = Unknown or not locked
INT_MIN + 1 = N/A for DVB-S2 MIS
RO int32
0x07 BER pre-Viterbi Pre-Viterbi bit error rate
INT_MIN = Unknown or not locked
INT_MIN + 1 = N/A for DVB-S2
RO uint64
0x08 BER post-Viterbi Post-Viterbi bit error rate
INT_MIN = Unknown or not locked
INT_MIN + 1 = N/A for DVB-S2
RO uint64
0x09 BER pre-RS Pre-Reed Solomon bit error rate
INT_MIN = Unknown or not locked
INT_MIN + 1 = N/A for DVB-S2
RO uint64