Rohde & Schwarz FSH4 - The Constellation Diagram

R&S FSH Digital Modulation Analyzer
Measurements on LTE Signals
Operating Manual 1173.6275.12 - 30 316
9.8.3 The Constellation Diagram
If you equip the R&S FSH with option R&S FSH-K50E or -K51E, the constellation
diagram becomes available to visualize the results in a diagram.
► Press the "Result Display" softkey.
► Select the "Constellation Diagram" menu item.
The R&S FSH starts the constellation diagram.
Screen layout of the constellation diagram
1 Current type of result display
2 Currently selected standard
3 Color map
4 Diagram area
5 Currently selected allocation
6 LTE softkey menu
The constellation diagram shows the location of the transmitted symbols in the
complex plane. It is therefore an indicator of the quality of the modulation of the signal.
By default, the result display shows the symbol locations over all allocations. In that
case, the R&S FSH distinguishes modulation schemes used in the transmission of
data channels by using different colors.
● QPSK modulation
● 16QAM modulation
● 64QAM modulation
For easy identification of the pilot, synchronization and control channels in the diagram,
the R&S FSH also uses different colors.
● PSYNC
● SSYNC
● Control channels with QPSK modulation