Monitoring Signal Characteristics
R&S
®
SMW200A
561User Manual 1175.6632.02 ─ 16
Vector Diagram
The vector diagram displays the Q component over the I component. All points in the
complex domain are connected by lines.
Figure 8-2: Vector diagram (64 QAM)
X-axis, Y-axis = amplitudes of the signal components, scaled to the peak envelope power; where minimum
scaled amplitude = -1, maximum scaled amplitude = +1
Application: To analyze the transition between the various states of modulation map-
ping, especially with linear modulations like MSK, QPSK or QAM. This mode shows
the signal like an oscilloscope (X/Y-mode).
Signal acquisition points: See Table 8-2.
Constellation Diagram
Constellation diagrams display the modulation symbols as discrete points in the I/Q
plane. Unlike the vector diagram, the constellation diagram displays only one sample
per symbol. This sample represents the symbol.
Constellation diagrams are helpful when generating signals using the "Custom Digital
Modulation" settings. Compare the displayed constellation diagram with the diagram
displayed in the "Custom Digital Modulation > Modulation" dialog.
Displaying Baseband Signal Characteristics in Real-Time
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