Keysight E8663D, Руководство пользователя

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Keysight E8357D/67D & E8663D PSG User’s Guide 91
Basic Digital Operation
Custom Modulation
Custom Arb Waveform Generator
The signal generator’s Arb Waveform Generator mode is designed for
out–of–channel test applications. This mode can be used to generate data
formats that simulate random communication traffic and can be used as a
stimulus for component testing. Other capabilities of the Arb Waveform
Generator mode include:
configuring single or multicarrier signals. Up to 100 carriers can be
configured.
creating waveform files using the signal generator’s front panel interface.
The waveform files, when created as random data, can be used as a stimulus
for component testing where device performance such as adjacent channel
power (ACP) can be measured. The AUTOGEN_WAVEFORM file that is
automatically created when you turn the Arb Waveform Generator on can be
renamed and stored in the signal generator’s non–volatile memory. This file
can later be loaded into volatile memory and played using the Dual ARB
waveform player.
For more information, refer to the sections
“Using the Dual ARB Waveform
Player” on page 103 and “Modes of Operation” on page 10 .
Custom Real Time I/Q Baseband
The real–time mode simulates single–channel communication using
user–defined modulation types along with custom FIR filters, and symbol rates.
Data can be downloaded from an external source into PRAM memory or
supplied as real time data using an external input. The Real Time I/Q Baseband
mode can also generate pre–defined data formats such as PN9 or FIX4. A
continuous data stream generated in this mode can be used for receiver bit
error analysis. This mode is limited to a single carrier. The Real Time I/Q
Baseband mode:
has more data and modulation types available than the Arb Waveform
Generator mode.
supports custom I/Q constellation formats.
has the capability to generate continuous PN sequences for bit error rate
testing (BERT).
needs no waveform build time when signal parameters are changed.
For more information, refer to the custom arb section
“Overview” on page 186 ,
the custom real time section “Overview” on page 214 and the section on
“Digital Modulation” on page 10 .