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7 receiver statistics – DekTec DTM-3237 DVB-S2 Receiver User Manual

Page 23

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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