Rohde & Schwarz SMM100A, User Manual

Page: 88 / 1088

Configuring the internal baseband source
R&S
®
SMM100A
88 User Manual 1179.1341.02 ─ 05
4.4.1 Basics on signals, modulation types and filters
This section provides general information on common topics and basic principles.
● Data, clock and control signals and sources in the baseband ................................ 88
● Regular marker output signals ................................................................................ 92
● Baseband trigger signals .........................................................................................94
● Supported modulation signals ...............................................................................102
● Supported coding schemes ...................................................................................103
● Supported baseband filters ................................................................................... 103
● Methods for optimizing the crest factor ................................................................. 106
4.4.1.1 Data, clock and control signals and sources in the baseband
This section describes common characteristics of the signals used for generating the
baseband signal for all standards. Common characteristics do not depend on the used
generation mode.
The selection in the dialogs at any given time depends on the parameter and standard
concerned. It is clear from the selection list offered in the dialog. Some parameters are
therefore not available in certain cases.
Characteristics specific to particular standards are described in the corresponding user
manual.
For the generation of modulation signals, the instrument uses the following input sig-
nals:
●
Internal modulation data
●
Clock signals
●
Control signals
Signal sources
The data, the clock and the trigger signals can be both internally generated and sup-
plied from an external source. Control signals however are always generated internally.
Depending on the current configuration, the internally generated data and marker sig-
nals are output on one or several connectors. The output capabilities of the instrument
and the required connectors are configurable.
See also Chapter 11.2, "Configuring local and global connectors" , on page 527.
Internal modulation data
The R&S SMM100A uses the following internal modulation data sources:
●
Data lists
Data lists are externally or internally created binary lists with modulation data.
The instrument provides standard file select function for loading of existing data
lists, creating internally new data lists or editing an existing one. Internally, data
lists are created in the dedicated "Data List" editor (see
Chapter 4.5.3.7, "Data list
editor" , on page 128). A separate file is created for each list and saved on the
Common functions and settings in the baseband domain