Applying I/Q Vector Modulation
R&S
®
SMW200A
419User Manual 1175.6632.02 ─ 16
Remote command:
[:SOURce<hw>]:IQ:STATe on page 1049
Adjust I/Q Modulator Current Frequency
Starts the adjustment for the I/Q modulator for the currently set frequency and base-
band gain. The I/Q modulator is adjusted regarding carrier leakage, I/Q imbalance and
quadrature.
See also "To trigger the internal correction routine of the I/Q modulator " on page 425.
Remote command:
:CALibration<hw>:IQModulator:LOCal? on page 792
I/Q Swap
Selects normal or swapped I/Q control for the generated signal.
The I/Q modulator defined in the IS2000 standard differs from the definition in this
implementation. The definition on which the implementation is based is used by virtu-
ally all digital communication standards, except IS95 and IS2000.
In the final step, the filtered IQ signal is modulated to the desired RF in a different way
in the I/Q modulator:
Figure 6-1: Definition of I/Q modulator in IS2000 and the R&S
SMW
IS2000 = the RF signal s(t) is derived from the baseband I/Q signal as s(t)=i(t)cos(2*pi*f
c
t) +
q(t)sin(2*pi*f
c
t)
R&S SMW = the RF signal s(t) is based on the definition s(t)=i(t)cos(2*pi*f
c
t) - q(t)sin(2*pi*f
c
t)
See also:
●
description "CDMA2000
®
incl. EV-DV Digital Standard for R&S SMW"
●
description "1xEV-DO Rev. A, Rev. B Digital Standard for R&S SMW"
"Off"
I/Q control is normal.
"On"
The modulation sidebands are inverted by swapping the I and Q sig-
nals (the Q-part of the signal is inverted).
The generated baseband signal is according to CDMA200 and 1xEV-
DO standards.
An I/Q modulator defined according to these standards can cope with
the RF signal generated by the R&S SMW.
Remote command:
[:SOURce<hw>]:IQ:SWAP[:STATe] on page 1050
I/Q Modulator Settings
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