Measuring A Custom Qpsk Format Signal - Agilent Technologies ESA-E Series User And Programming Manual

Measuring a Custom QPSK Format Signal

The Modulation Analysis Personality allows you to demodulate a QPSK
modulation formatted signal using your own custom parameters. This
section provides an example of how to set up the analyzer to measure
such a signal. The signal parameters are: type QPSK modulation,
symbol rate 3.84 Msps, Root Nyquist filtering using Alpha/BT of 0.35.
1. Press
2. Press
3. Press
4. Press
5. Press
6. Press
You should see the classic four symmetric decision regions (symbol
points) of a QPSK constellation, as shown in
Figure 4-36 Polar Constellation of a QPSK Signal
Chapter 4
,
Demod Format
,
Symbol Rate 3.84 Msps
Meas Filter, Root Nyquist
filter.
Ref Filter, Nyquist
Det/Demod, Alpha/BT, 0.35, Enter
value.
,
View/Trace I/Q Measured Polar Constln
constellation view.
Making Modulation Analysis Measurements
Measuring a Custom QPSK Format Signal
to select the correct demodulation format.
QPSK
to enter the correct symbol rate.
to select the correct measurement
to select the correct reference filter.
to enter the correct alpha
to select the correct
Figure 4-36.
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