R&S SMJ100A, Operating Manual

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Instrument Function
R&S
®
SMJ100A
411 Operating Manual 1403.7458.32 ─ 14
5.8.3.4 Multi Carrier Waveforms
Multi carrier waveforms consisting of up to 512 carriers modulated by user-selectable
baseband signals can be created in order to simulate complex multi carrier scenarios
with different baseband signals (e.g. CDMA2000 or 3GPP FDD).
The carriers are equally spaced and centered toward the RF frequency or baseband
DC line, respectively. The carrier spacing is adjustable within the total available base-
band bandwidth of 80 MHz. Each carrier can be separately defined in terms of power,
phase and modulated input signal. Optionally, crest factor optimization can be applied.
Thus, multi carrier waveforms can be very easily configured as broadband test signals
and used for such purposes as transmitter or receiver tests. Even complex multi carrier
scenarios composed of signals from different digital standards can be created and
used for these tests.
Example for the creation of a multi carrier waveform file
1. Configure general settings
2. Configure carrier table
3. Enter file name of multi carrier waveform ("Output File")
4. Save and load multi carrier waveform ("Create" or "Create and Load")
User Interface
To access the "Multi Carrier" dialog, select "Baseband > ARB > Multi Carrier...".
The menu can be used to create a multi carrier waveform and save it under its own
name. As with normal waveforms, the file extension is
*.wv
. Information on clock rate,
number of samples and creation day is displayed in the File menu when a waveform is
loaded.
The "Multi Carrier" dialog is divided into the following sections.
The upper part of the menu is used for calling the default settings and saving and
recalling the submenu settings.
The General Settings section is used to configure the main multi carrier waveform.
Baseband Signal - Baseband Block