Basics on I/Q Data Acquisition and Processing
R&S
®
FSWP
35User Manual 1177.5856.02 ─ 07
For details on the MSRA operating mode see the R&S FSWP MSRA User Manual.
4.7 Measurements in the Time and Frequency Domain
The I/Q Analyzer slave application (not Master) in multistandard mode can also per-
form measurements on the captured I/Q data in the time and frequency domain. In
order to do so, the I/Q Analyzer performs an FFT sweep on the captured I/Q data, pro-
viding power vs frequency results, or uses the RBW filter to obtain power vs time (zero
span) results. This data is then used for the common frequency or time domain mea-
surements provided by the R&S FSWP Spectrum application, such as ACLR, SEM or
CCDF.
Configuration
Apart from the data capturing process, the measurements are identical in the Spectrum
and I/Q Analyzer slave applications. They are configured using the same settings and
provide the same results. The "Magnitude" result display in the I/Q Analyzer, for
instance, will principally show the same results as the zero span measurement for the
same data. However, while the "Magnitude" evaluation is configured by the I/Q analy-
sis bandwidth and the measurement time, the zero span measurement is configured by
the center frequency, RBW and sweep time settings. Internally, these "time domain"
settings are converted to the required I/Q settings by the I/Q Analyzer.
The time and frequency domain measurements and the required settings are descri-
bed in detail in the R&S FSWP User Manual.
Limitations
However, since the data in the I/Q Analyzer slave application is captured by the Mas-
ter, independently of the specific time or frequency measurement requirements con-
cerning the RBW, filter type and number of sweep points in the slave application, some
restrictions may apply to these measurements in the I/Q Analyzer. If not enough sam-
ples are available in the captured and converted I/Q data, for example, an error mes-
sage is displayed in the slave application.
The maximum span for a frequency sweep on I/Q-based data corresponds to the
maximum I/Q bandwidth.
The maximum resolution bandwidth (RBW) is 1 MHz.
Furthermore, the following functions are not available for time and frequency domain
measurements in multistandard mode:
●
Marker demodulation
●
Frequency counter marker
●
Gated measurement
●
Video trigger
Measurements in the Time and Frequency Domain
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