QPSK (Quadrature Phase Shift Keying)
Quadrature Phase Shift Keying modulation is a modulation technique that
shifts the output signal phase among four preset phases: the carrier phase
and three modulating phases. The shift frequency (QPSK rate) is determined
by the internal signal level of the instrument. The QPSK user interface is
shown below.
Figure 5-25: QPSK user interface
How to set the parameters of QPSK
(1) Press the Mode function key,press the NextPage softkey three more
times,then press the QPSK softkey to enter QPSK user interface.
(2) Select carrier wave shape:
The carrier wave can be Sine, Square, Ramp, or Arbitrary wave (except
DC). Press , , , or to select a desired carrier wave
shap.
(3) Set carrier wave parameters:
Press the wave shap key of the selected carrier wave to display the
waveform and parameters of the carrier wave. You can change the
parameters of the carrier wave. Press Mode to return to the modulation
mode interface.
(4) Set QPSK rate:
Press the Rate softkey to set the QPSK rate. The rate at which the output
phase shifts between the carrier phase and the modulating phase is
determined by QPSK rate (for internal source). The range is 2 mHz –
1 MHz.
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