Promax PRODIG-5 - Page 136

USER’S MANUAL. PRODIG-5
Page 54 11/2006
-6 -5 -4 -3 -2 -1
FREQ:
CH:
MPEG-2
650.00 MHz
-3 kHz
43
C/N:
POWER:
MER:
» CBER:
VBER:
dB
dBµV
dB
>21.3
55.8
19.5
5.0E-4
5.3E-5
Figure 28.- Screen of CBER measurement (COFDM signals).
In a reception system of terrestrial digital signal, after the COFDM decoder two
error correction methods are applied. Obviously, each time we apply an error corrector
to the digital signal, the error rate changes, therefore if we measure the error rate at the
output of the COFDM demodulator, at the output of the Viterbi decoder, and at the
output of the Reed-Solomon decoder, we obtain nothing more than different error rates.
The PRODIG-5
(EXPLORER) provides the BER after Viterbi (VBER).
Figure 29.- COFDM reception system.
-7 -6 -5 QEF -3 -2 -1
FREQ:
CH:
MPEG-2
650.00 MHz
-3 kHz
43
C/N:
POWER:
MER:
CBER:
» VBER:
dB
dBµV
dB
>21.3
55.8
19.5
5.0E-4
5.3E-5
Figure 30.- Screen of BER measurement (COFDM signals). VBER.