Simulating Fading, Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMW200A
439User Manual 1175.6632.02 ─ 30
State
Enables or disables the phase noise generator.
If enabled, the null phase angle of the carrier is varied. A noise component with a
defined frequency response is added.
Remote command:
[:SOURce<hw>]:NOISe:PHASenoise[:STATe] on page 1184
Load Profile, Save Profile
Opens the standard "File Select" dialog with standard file handling functions.
The single-sideband (SSB) spectrum of the signal carrier or, for multicarrier methods,
of all single carriers follows the filter curve characteristics of the profile file.
Note: If the generation of the profile fails, as it happens for some wanted signal
shapes, we recommend that you measure the generated phase noise to ensure that it
is equal to the expected phase noise.
For description of the file format, see "About the single sideband shape profiles"
on page 434.
Remote command:
[:SOURce<hw>]:NOISe:PHASenoise:SHAPe:STORe on page 1185
[:SOURce<hw>]:NOISe:PHASenoise:SHAPe:SELect on page 1184
[:SOURce<hw>]:NOISe:PHASenoise:SHAPe:PREDefined:CATalog?
on page 1184
SSB Shape Profile
Indicates the name of the currently used single-sideband (SSB) profile file.
"SSB Shape Profile = User" indicates that no profile is loaded.
Phase Noise Table
Defines a single-sideband (SSB) shape profile.
The shape profile is defined as a sequence of 5 points, each describing a frequency/
phase noise pair.
The graph on the left displays two color-coded curves:
●
Yellow: the current profile, as set with the frequency/phase values.
●
Red: the calculated filter shape incl. the amplitude values at the frequency points.
If the values are extracted from a file, you can change the amplitude value for the first
point only. The values of the remaining four points are calculated automatically as sum
of the value defined in the profile and the delta used for the first point.
Remote command:
[:SOURce<hw>]:NOISe:PHASenoise:LEVel<ch> on page 1185
[:SOURce<hw>]:NOISe:PHASenoise:FREQuency<ch> on page 1185
6.4 Impairing the Signal
In the R&S SMW, analog and digital linear impairments such as I/Q imbalance and
quadrature error can be added to the generated signal.
Impairing the Signal
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