Digital Signal Processing Reference
In-Depth Information
ratio because this value can be used aligning the satellite receiving antenna
and for determining the quality of reception. The circuit itself is not very
complex. In most cases, DVB-S receivers display two bar graphs in their
setup menu, one for the signal strength and one for signal quality. The lat-
ter is derived from the bit error ratio.
I
Viterbi
decoder
Data
Q
Convolutional
coder
Q
Comparator
Delay
BER
Fig. 15.1.
Circuit for measuring the pre-Viterbi bit error ratio
Fig. 15.2.
Spectrum of a DVB-S signal (10 dB/Div, 10 MHz/Div, Span 100 MHz)
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