Rohde & Schwarz FSWP Series - Basics on Input from I;Q Data Files

Basics on I/Q Data Acquisition and Processing
R&S
®
FSWP
25User Manual 1177.5856.02 ─ 07
Table 4-3: Maximum record length with activated I/Q bandwidth extension option B320
Sample rate Maximum record length
100 Hz to 200 MHz*) 440 Msamples
200 MHz to 468 MHz 470 Msamples * sample rate / 1GHz
468 MHz to 10 GHz
MSRA master:
468 MHz to 600 MHz
220 Msamples
*) for sample rates up to 200 MHz the I/Q Bandwidth Extension B320 is not used
4.2 Basics on Input from I/Q Data Files
The I/Q data to be evaluated in a particular R&S FSWP application can not only be
captured by the application itself, it can also be loaded from a file, provided it has the
correct format. The file is then used as the input source for the application.
For example, you can capture I/Q data using the I/Q Analyzer application, store it to a
file, and then analyze the signal parameters for that data later using the Pulse applica-
tion (if available).
The I/Q data must be stored in a format with the file extension .iq.tar. For a detailed
description see Chapter A.3, "I/Q Data File Format (iq-tar)", on page 154.
An application note on converting Rohde & Schwarz I/Q data files is available from the
Rohde & Schwarz website:
1EF85: Converting R&S I/Q data files
As opposed to importing data from an I/Q data file using the import functions provided
by some R&S FSWP applications (e.g. the I/Q Analyzer or the R&S FSWP VSA appli-
cation), the data is not only stored temporarily in the capture buffer, where it overwrites
the current measurement data and is in turn overwritten by a new measurement.
Instead, the stored I/Q data remains available as input for any number of subsequent
measurements. Furthermore, the (temporary) data import requires the current mea-
surement settings in the current application to match the settings that were applied
when the measurement results were stored (possibly in a different application). When
the data is used as an input source, however, the data acquisition settings in the cur-
rent application (attenuation, center frequency, measurement bandwidth, sample rate)
can be ignored. As a result, these settings cannot be changed in the current applica-
tion. Only the measurement time can be decreased, in order to perform measurements
on an extract of the available data (from the beginning of the file) only.
When using input from an I/Q data file, the [RUN SINGLE] function starts a single mea-
surement (i.e. analysis) of the stored I/Q data, while the [RUN CONT] function repeat-
edly analyzes the same data from the file.
Basics on Input from I/Q Data Files