Configuring the Internal Baseband Source
R&S
®
SMW200A
262User Manual 1175.6632.02 ─ 30
5.6.1 Required Options
The equipment layout for generating the digital modulation signals includes:
●
Option standard or wideband baseband generator (R&S SMW-B10/-B9) per signal
path
●
Option baseband main module, one/two I/Q paths to RF (R&S SMW-B13/-B13T) or
Option wideband baseband main module two I/Q paths to RF (R&S SMW-B13XT)
5.6.2 About the Custom Digital Modulation
An introduction to the supported filter, modulation, and coding schemes are provided
in:
●
Chapter 5.5.1.6, "Supported Baseband Filters", on page 247
●
Chapter 5.5.1.4, "Supported Modulation Signals", on page 245
●
Chapter 5.5.1.5, "Supported Coding Schemes", on page 246.
Interdependency between selected modulation type and coding scheme and
handling of conflicting settings
The applied coding is directly related to the selected modulation methods. The availa-
ble coding schemes listed in Chapter 5.6.5.1, "Common Coding Algorithms",
on page 291 are not freely combinable with modulation methods.
Obviously, having selected a modulation procedure, not every combination of the fur-
ther modulation parameters "Symbol Rate" and "Coding" is possible. These restrictions
inevitably result in conflicting settings if you change a parameter and leads to a prohibi-
ted combination.
An inappropriate change of a parameter triggers a settings conflict, which is indicated
by a message on the "Info" line in the display. Although the R&S SMW displays the
selected settings, the generated modulation signal does not correspond to this display.
The displayed message disappears when a conflict-free setting is selected.
Refer to Chapter 15, "Troubleshooting and Error Messages", on page 1257 for a list of
the possible settings conflicts and messages in digital modulation.
5.6.3 Custom Digital Modulation Settings
Access:
► Select "Baseband > Custom Digital Mod".
The "Custom Digital Modulation" dialog enables direct selection of the data source,
standard, symbol rate, coding, modulation type and filter.
The dialog is divided into several tabs. In each case, the current setting is dis-
played in the tab name.
Generating Custom Digital Modulated Signals
To Next Page
Loading...