Simulating Fading, Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMW200A
424User Manual 1175.6632.02 ─ 30
Option: R&S SMW-B9, enabled in:
●
"System Config > Fading/Baseband Config > Mode = Standard" with "Signal Out-
puts = Analog Only"
●
"System Config > Fading/Baseband Config > Mode = Advanced".
Remote command:
[:SOURce<hw>]:AWGN:STATe on page 1092
Coupled Mode
Couples the configuration of all streams.
Note: In the default state of the AWGN, this parameter is enabled. We recommend that
you configure the AWGN settings in coupled mode.
When you disable the coupled mode, the instrument does not apply the current set-
tings to all streams. The settings of the individual streams are in the state they ware
before the coupled mode was enabled.
See also "Joint configuration of all streams" on page 421.
Remote command:
[:SOURce<hw>]:AWGN:CMODe[:STATe] on page 1092
Mode
Activates/deactivates the generation of an AWGN signal. The interferer (AWGN or CW
interferer, depending on the selected mode) is generated after the generator is activa-
ted.
"Additive
Noise"
The AWGN noise signal with selectable system bandwidth is added
to the baseband signal.
"Noise Only"
The pure AWGN noise signal with selectable system bandwidth is
modulated to the carrier. The connection to the baseband is interrup-
ted.
"CW Interferer"
A sine with a defined frequency offset is added to the baseband sig-
nal.
This mode is disabled in "System Configuration" with more than 4
input streams.
Remote command:
[:SOURce<hw>]:AWGN:MODE on page 1093
System Bandwidth
For "Additive Noise" and "Noise Only" modes, sets the RF bandwidth to which the set
carrier/noise ratio relates.
Within this frequency range, the signal is superimposed with a noise signal which level
corresponds exactly to the set C/N or S/N ratio.
For more information, refer to the description of Figure 6-2.
Remote command:
[:SOURce<hw>]:AWGN:BWIDth on page 1093
Minimum Noise/System Bandwidth Ratio
For "Additive Noise" and "Noise Only" modes, sets the ratio of minimum noise band-
width to system bandwidth, as required by some standards.
Adding Noise to the Signal
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