Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMBV100B
261User Manual 1178.4460.02 ─ 03
"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 798
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 4-2.
Remote command:
[:SOURce<hw>]:AWGN:BWIDth on page 798
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.
Noise Bandwidth = System BW x Minimum Noise/System BW Ratio
The parameter Noise Bandwidth displays the resulting noise bandwidth. Because the
noise power density is a constant value, increasing the noise/system bandwidth ratio
increases the noise bandwidth.
The calculation of level from the selected C/N or S/N ratio in relation to system band-
width is not influenced.
Remote command:
[:SOURce<hw>]:AWGN:BWIDth:RATio on page 798
Target CW Frequency Offset
In "CW Interferer" mode, sets the desired frequency of the sine wave.
Remote command:
[:SOURce<hw>]:AWGN:FREQuency:TARGet on page 802
Adding Noise to the Signal
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