M8195A User Interface 2
Keysight M8195A Revision 2 – Arbitrary Waveform Generator User’s Guide 69
2.12 Complex Modulated Waveform Tab
Use this tab 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-QPSK, Offset-QPSK (O-QPSK),
8-PSK, and 3π/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.
Pulse Shaping type, characteristics, and different data options may be selected by the
user. 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.
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