R&S WinIQSIM2 Software Manual - Rohde & Schwarz

R&S ® WinIQSIM2
Graphical User Interface
Baseband Block
5.10.4.5 Typical Applications for Multi Carrier Waveforms
High Power Amplifiers of multi carrier base stations face increased requirements in terms
of linearity and acceptable intermodulation performance.
A standard transmitter test might be quickly setup by the following instructions:
1. Load a standardized 3GPP downlink test model, e.g. "Test Model 1_16" and set State
to "ON".
2. Create a 3GPP Testmodel ARB file by activating "Generate Waveform File".
3. Setup a multi carrier scenario with 4 carriers and a carrier spacing of 5 MHz.
4. Apply the input file containing the previously generated 3GPP testmodel to all 4 carriers.
5.10.5 Multi Segment Waveforms
To fulfill the requirements of some test systems and to enable rapid alternation between
different waveforms with differing test signals, the R&S Signal Generator provides the
functionality to generate multi segment waveform files. A multi segment waveform is a
combination of multiple waveforms called segments. Each segment represents a completely
independent waveform that can be output with its own marker and clock settings.
The entire multi segment waveform is loaded into memory. The segment intended to be
output at any given moment can be selected by the user. It is therefore possible to alternate
between the individual waveform segments without experiencing any delay due to
the loading operation.
If very high switchover speeds are required, the test signals can be continuously scrolled
through with the aid of an external trigger or by applying a predefined “play list”. For this
purpose the segments must have a common sample rate. If the combined waveforms
have different sample rates, they can be adapted to a common sample rate by resampling.
By the same procedure the instantaneous amplitude of the various waveforms can
be scaled to a common RMS level.
To access the "Multi Segment" dialog, select "Baseband > Multi Segment...".
The menu can be used to create a multi segment waveform from existing waveforms and
save it under its own name. As with normal waveforms, the file extension is *.wv. Information
on whether a file is a multi segment waveform is displayed in the File menu with
the tag information when a waveform is loaded. Additionally, an information about the
waveform can be aquired in the "Waveform Info" dialog.
If the combined waveforms have different sample rates, they can be adapted to a common
sample rate by resampling. By the same procedure the instantaneous amplitude of
the various waveforms can be scaled to a common rms level.
The configuration of a multi segment waveform, that is to say details of how it is made
up from different waveforms, the level and clock rate settings, and the file name, can be
saved separately in a list. The file extension is *.inf_mswv. This method can be used
to create any number of configurations as a basis for defining further multi segment
waveforms.
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