Keysight M8194A 120 GSa/s Arbitrary Waveform Generator User Guide 65
M8194A Soft Front Panel 3
Complex Modulated Waveform Tab
The Complex Modulated Waveform tab is used to create baseband and
IF/RF digitally modulated signals. User-defined corrections may be
applied to signals to compensate for (or emulate) instrument,
interconnections and channel linear distortions. The complex modulation
tab allows you to generate both RF and Baseband (I/Q) signals. It directly
supports a large variety of signal-carrier modulation schemes. This is a list
of the currently supported standards, modulation orders, and modulation
parameters:
• ASK (Amplitude Shift Keying): Modulation Index (0%-100%).
• PSK (Phase Shift Keying): BPSK, QPSK, π/4-DQPSK, Offset-QPSK
(OQPSK), 8PSK, and 3 π /8 8PSK (EDGE).
• QAM (Quadrature Amplitude Modulation): 8QAM, 16QAM, 32QAM,
64QAM, 128QAM, 256QAM, 512QAM, AND 1024QAM.
• MSK (Minimum Shift Keying)
• APSK (Amplitude-Phase Shift Keying): 16APSK and 32 APSK. R2/R1
and R3/R1 can be set by the user to any desired value.
• STAR: STAR16 and STAR32. The R2/R1 parameter may be set for the
STAR16 modulation scheme.
• VSB (Vestigial Side Band): 8VSB and 16VSB.
• FSK (Frequency Shift Keying): 2FSK, 4FSK, 8FSK, and 16FSK. Peak
deviation frequency may be set by the user to any desired value.
• Custom: Users may define arbitrary constellations through simple
ASCII files that may be read by the SFP application. Modulations with
offset (Q delayed by half a symbol time) and rotating constellations may
be also defined. (Refer to the section)
The user is allowed to select pulse shaping type, characteristics, and
different data options. The panel provides a constellation preview
functionality, which can be used to validate the selected modulation
scheme and the corresponding modulation parameters. The application
takes care of handling the requirements and limits of the target hardware
with respect to maximum and minimum record lengths, sampling rate, and
record length granularity. As a result, generation of the signals designed in
this tab will always be feasible by the instrument and free of distortions
such as wrap-around or timing artifacts at any signal domain (time,
frequency, and modulation), even if the signal is generated in looped
mode.
Figure 17 on page 66 display the Complex Modulated Waveform tab and
its controls.
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