Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMBV100B
264User 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 "Carrier + 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 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 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 "Carrier+Noise (PEP)" indicates the PEP
value of the overall signal.
See also Figure 4-3.
Adding Noise to the Signal
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