Working With Modulation Types; To Select A Predefined Modulation Type; To Use A User-Defined Modulation Type (Real Time I/Q Only) - Keysight E8267D User Manual

Custom Arb Waveform Generator

Working with Modulation Types

Working with Modulation Types

The Modulation Type menu enables you to specify the type of modulation
applied to the carrier signal when the Mod On Off hardkey is on.
When the Custom Off On softkey is on:
— For Custom Arb, the BBG (baseband generator) creates a sampled version
— For Custom Real Time I/Q, the real–time custom I/Q symbol builder creates
In Custom Real Time I/Q, you can also:
— Create user–defined modulation type (see
— Restore all modulation parameters to their default state.

To Select a Predefined Modulation Type

1. Press Preset.
2. Press Mode > Custom > ARB Waveform Generator > Digital Mod Define >
3. Select one of the available modulation types.
If you select QPSK and OQPSK, you must make a specific selection from the
NOTE
menu that displays.
To Use a User–Defined Modulation Type (Real Time I/Q Only)
Creating a 128QAM I/Q Modulation Type User File with the I/Q Values
Editor
In I/Q modulation schemes, symbols appear in default positions in the I/Q
plane. Using the I/Q Values editor, you can define your own symbol map by
changing the position of one or more symbols. Use the following procedure to
create and store a 128–symbol QAM modulation.
Keysight E8357D/67D & E8663D PSG User's Guide
of the I/Q waveform based on a random data pattern and the modulation
type that has been selected.
I/Q symbols based on the data pattern and modulation type that has been
selected (see "Working with Data Patterns" on page 215
selecting a data pattern).
immediately or saved to the Memory Catalog.
Modulation Type > Select
or
Mode > Custom > Real Time I/Q Baseband > Modulation Type > Select
for information on
page 201) that can be used
201