Instrument Function
R&S
®
SMBV100A
150Operating Manual 1407.6062.32 ─ 08
5.3.3 Signal Displays
All signal displays which are used for analyzing a baseband signal can be selected. A
number of signal displays are only available if the corresponding signal is generated, e.g.
Code Domain only available for (W)CDMA signals.
5.3.3.1 I/Q Diagram
The I/Q diagram displays the inphase component (i[t]) and quadrature component (q[t])
of the I/Q signal over time.
The diagram is displayed in a window with two separate coordinate systems. The coor-
dinate systems have identical X and Y axes. The time (in number of symbols, chips or
samples depending on the signal) is plotted on the X axes, and the amplitude scaled to
the peak envelope power (PEP) is plotted on the Y axes (minimum scaled amplitude =
-1; maximum scaled amplitude = +1). The recording depth is 1 kSamples.
This signal is picked off at the output of the baseband main module ("Impairment" function
block), i.e. contained in the displayed signal is:
●
impairment of the signal as defined by the user and the addition of noise.
5.3.3.2 Vector Diagram
The Q component is displayed over the I component in the vector diagram. Each point
is determined by a vector. The amplitudes of the signal components scaled to the peak
envelope power (PEP) are plotted on the X and Y axis (minimum scaled amplitude = -1;
maximum scaled amplitude = +1).
This display shows the curves between the various states of modulation mapping. The
recording depth is 1 kSamples.
This signal is picked off at the output of the baseband main module ("Impairment" function
block), i.e. contained in the displayed signal is:
●
impairment of the signal as defined by the user and the addition of noise.
Graphical Display - Graphics
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