Rohde & Schwarz R&S SMW200A - Page 428

Simulating Fading, Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMW200A
428User Manual 1175.6632.02 ─ 30
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In "Reference Mode > Carrier": sets the noise power and hence the power of the
output signal, i.e. the carrier + noise signal.
It does not affect the power of the useful signal, i.e. the carrier power is kept con-
stant.
●
In "Reference Mode > Noise": sets the power of the useful signal, i.e. the carrier
power.
The noise power is kept constant.
●
The power of the noise signal is derived from the selected E
b
/N
0
and displayed with
the parameter "Noise Power" in the units of the useful signal.
●
The power of the useful signal is displayed with the parameter "Carrier Power".
This indication corresponds to the "Level" value in the "Status bar".
●
The power of the output signal is displayed as "Carrier + Noise Power".
See also Figure 6-3.
Remote command:
[:SOURce<hw>]:AWGN:ENRatio on page 1095
Carrier Power, Signal Power
("Additive Noise" and "CW Interferer")
The name of this parameter depends on the selected output Show Powers For Output.
●
In "Reference Mode > Carrier": sets the carrier power. This indication corresponds
to the "Level" value in the "Status bar".
The power of the noise signal is derived from the selected C/N or S/N value and
displayed with the parameter "Noise Power" in the units of the useful signal.
●
In "Reference Mode > Noise", indicates the carrier power as derived from the
entered C/N or S/N value. This indication corresponds to the "Level" value in the
"Status bar".
The noise power can be set with the parameter "Noise Power".
Note: The peak envelope power (PEP) displayed in the "Status bar" corresponds to
the PEP value of the carrier. The parameter "Carrier+Noise (PEP)" indicates the PEP
value of the overall signal.
See also Figure 6-3.
Remote command:
[:SOURce<hw>]:AWGN:POWer:CARRier on page 1096
Noise Power (System Bandwidth), Interferer Power
Displays the power of the noise signal in the system respectively the total bandwidth in
"Noise Only" and "Additive Noise" mode.
●
"Noise Only" mode
Sets the power of the noise signal. This indication corresponds to the "Level" value
in the "Status bar".
●
"Additive Noise" mode
– "Reference Mode > Noise"
Sets the power of the noise signal. The power of the carrier is derived from the
entered C/N or S/N or Eb/N0 value.
– "Reference Mode > Carrier"
Displays the power of the noise signal in the system bandwidth. The power of
the noise signal is derived from the entered C/N or S/N or Eb/N0 value.
Adding Noise to the Signal