Instrument Function
R&S
®
SMBV100A
359
Operating Manual 1407.6062.32 ─ 08
Flexible Dynamic Switchovers without Signal Interruptions
Testing receivers requires a continuous output of different test signals without interrupting
the signal. The test signals then produce a complex total signal with no signal gaps on
switchover. Control procedures can use a simulated back channel of the receiver (trigger
line or remote control).
Switching times depend on the length of the segment currently being output, since
switchover to the next segment does not take place until the current segment comes to
an end.
1. "Extended Trigger Mode" = "Next Segment Seamless"
2. "Trigger Mode" = "Auto"
3. "Trigger Source" = "Internal or External"
If the waveforms have different sample rates:
4. "Clock Mode" = "Highest" or "User" (when creating the waveform in the Multi Segment
Editor)
5.8.4.3
Multi Carrier Waveforms
Multi carrier waveforms consisting of up to 32 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 baseband
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.
Baseband Signal - Baseband Block
Summary of Contents for SMBV100A
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