Rohde & Schwarz SMBV100B, User Manual

Page: 266 / 1030

Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMBV100B
264 User Manual 1178.4460.02 ─ 03
●
In "Reference Mode > Noise", sets the power of the useful signal , i.e. the carrier
power.
The power of the output signal remains constant.
●
The power of the noise signal is derived from the entered C/N or S/N value 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" and
can also be changed there. This indication corresponds to the "Level" value in the
"Status bar".
●
The power of the output signal is displayed as "C Noise Power".
See also Figure 4-3 .
Remote command:
[:SOURce<hw>]:AWGN:CNRatio
on page 800
E
b
/N
0
In "Additive Noise" mode, sets the ratio of bit energy to noise power density.
●
In "Reference Mode > Carrier": sets the noise power and hence the power of the
output signal, i.e. the c 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 "C Noise Power".
See also Figure 4-3 .
Remote command:
[:SOURce<hw>]:AWGN:ENRatio
on page 800
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 "Noise (PEP)" indicates the PEP
value of the overall signal.
See also
Figure 4-3 .
Adding Noise to the Signal