Rohde & Schwarz SMBV100A - Page 280

Instrument Function
R&S
®
SMBV100A
263Operating Manual 1407.6062.32 ─ 08
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In "Noise Reference Mode", this parameter indicates the carrier level which is derived
from the entered C/N or S/N value. This indication corresponds to the level indicated
in the "Level" header.
The nsoise level can be set under "Noise Level".
Note: The peak envelope power (PEP) specified in the header corresponds to the PEP
value of the carrier. The PEP value of the overall signal is displayed in the menu under
"Carrier+Noise PEP".
SCPI command:
[:SOURce<hw>]:AWGN:POWer:CARRier on page 500
Noise Level (System Bandwidth) / Interferer Level
(Additive Noise, Noise Only, CW Interferer)
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"Noise Only" mode
Sets the level of the noise signal. This entry corresponds to the level entered in the
"Level" header.
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"Additive Noise" mode
– "Noise Reference Mode"
Sets the level of the noise signal. The level of the carrier is derived from the
entered C/N or S/N or Eb/N0 value.
– "Carrier Reference Mode"
Displays the level of the noise signal in the system bandwidth. The level of the
noise signal is derived from the entered C/N or S/N or Eb/N0 value. The carrier
level is entered under "Carrier Level"; respectively the signal level is displayed
under "Signal Level".
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"CW Interferer" mode
– "Noise Reference Mode"
Sets the level of the interfering signal. The level of the carrier is derived from the
entered C/N or S/N value.
– "Carrier Reference Mode"
Displays the level of the interfering signal. The level of the interfering signal is
derived from the entered C/N or S/N value. The carrier level is entered under
"Carrier Level".
Note: The noise signal is not generated arbitrarily for a particular bandwidth, but instead
it is generated in steps. Noise therefore also occurs outside the set system bandwidth.
This means that the total measurable noise level (see below) usually exceeds the value
displayed here. Correct measurement of the noise level within the system bandwidth is
possible by means of channel power measurement using a signal analyzer.
Impairment of Digital I/Q Signal and Noise Generator - AWGN/IMP Block