Simulating Fading, Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMW200A
433User Manual 1175.6632.02 ─ 30
6.3.2 About the Impulsive Noise
Impulsive noise can be used to disturb the wanted signal with independent and bursted
white Gaussian noise signals.
For characteristics of the digitally generated signal:
See R&S SMW user manual, section "Adding Noise to the Signal".
Figure 6-5: Impulsive noise pattern
The R&S SMW delivers pulses with a duration of 0.250 μs. The amplitudes of the pul-
ses have Gaussian distribution. Their probability distribution function corresponds to an
even distribution within a burst. The burst duration is determined by the number of pul-
ses in a burst (Pulses per Burst) and the limits for the spacing (Pulse Spacing Mini-
mum/Pulse Spacing Maximum). The interval between two bursts is determined by the
frame duration (Frame Duration).
6.3.3 About the Phase Noise
The wanted signal of each path can be degraded by a phase noise signal with user-
defined characteristics. For this purpose, a Gaussian noise signal is arbitrarily filtered
and applied to the phase component of the wanted signal.
You have the following options to generate phase noise:
●
Configure the phase noise signal manually, by changing the settings in the "Phase
Noise" table.
The single sideband (SSB) shape profile is defined as a sequence of 5 points,
each describing a frequency/phase noise pair.
See Chapter 6.3.5, "Phase Noise Settings", on page 437.
●
Load a used-defined or a predefined single sideband shape profile file.
See:
– "About the single sideband shape profiles" on page 434
– "Predefined SSB profiles" on page 434
For any of the two ways, the graph on the left indicates the resulting phase noise.
Generating Impulsive and Phase Noise
To Next Page
Loading...