Basics on I/Q Data Acquisition and Processing
R&S
®
ZNL
26
User Manual 1178.5989.02 ─ 06
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
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.
4.4
I/Q Data Import and Export
Baseband signals mostly occur as so-called complex baseband signals, i.e. a signal
representation that consists of two channels; the in phase (I) and the quadrature (Q)
channel. Such signals are referred to as I/Q signals. The complete modulation informa-
tion and even distortion that originates from the RF, IF or baseband domains can be
analyzed in the I/Q baseband.
Importing and exporting I/Q signals is useful for various applications:
●
Generating and saving I/Q signals in an RF or baseband signal generator or in
external software tools to analyze them with the R&S
ZNL later
●
Capturing and saving I/Q signals with an RF or baseband signal analyzer to ana-
lyze them with the R&S
ZNL or an external software tool later
As opposed to storing trace data, which may be averaged or restricted to peak values,
I/Q data is stored as it was captured, without further processing. The data is stored as
complex values in 32-bit floating-point format. Multi-channel data is not supported. The
I/Q data is stored in a format with the file extension
.iq.tar
.
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
The import and export functions are available in the "Save/Recall" menu which is dis-
played when you select the "Save" or "Open" icon in the toolbar (see
I/Q Data Import and Export
