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M8190A User Interface 2

M8190A User’s Guide 63

2.11 Complex Modulation 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 signals for both direct conversion and external/internal up-converter (IQ)

modes. It directly supports a large variety of single-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

Custom Modulation File Format)

Baseband filter 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.

Keysight M8190A User Manual

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