Simulating Fading, Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMW200A
397User Manual 1175.6632.02 ─ 16
"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. The calculation of E
b
/N
0
ratio is omitted.
This mode is disabled in "System Configuration" with more than 4
input streams.
Remote command:
[:SOURce<hw>]:AWGN:MODE on page 1005
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 5-2.
Remote command:
[:SOURce<hw>]:AWGN:BWIDth on page 1006
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.
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 1006
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 1010
Resulting CW Frequency Offset
In "CW Interferer" mode, indicates the resulting frequency offset of the sine wave.
Remote command:
[:SOURce<hw>]:AWGN:FREQuency:RESult? on page 1010
Adding Noise to the Signal
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