Adding noise and predistortions, and impairing the signal
R&S
®
SMM100A
275
User Manual 1179.1341.02 ─ 05
The dialog confirms the required mean power of the interfering signal "Noise Power
(System Bandwidth) = -82.5 dBm".
3. Select "AWGN > General > State > On".
To generate a CW interfering signal
For the following example, we assume that two interfering signals are required, a
5
MHz uplink LTE signal and a CW signal. The signals are transmitted at
-52
dBm; the
LTE signal at
1.96
GHz and the CW signal 10
MHz below it. Signals with equal (or sim-
ilar) RF levels and at frequencies spaced within the max. RF bandwidth can be gener-
ated by the same path.
To configure the instrument:
1. Enable the required LTE signal:
a) Select "EUTRA/LTE > General Uplink Setting > Channel Bandwidth = 5 MHz"
and "EUTRA/LTE > State = On"
b) Select "Status bar > Frequency =
1.96 GHz" and "Level
=
-52
dBm"
2. Enable the required interfering signal:
a) Select "AWGN > General > Mode > CW Interferer"
b) Select "Target CW Frequency Offset = 10 MHz"
c) Select "Noise Power/Output Results > Reference Mode = Noise"
d) Select "Interferer Power = -52 dB"
e) Select "AWGN > General > State > On".
3. Select "RF > State > On"
Adding noise to the signal
