NB-IoT NPRACH Measurement
R&S
®
CMW-KM300/-KS300
337
User Manual 1178.5689.02 ─ 06
The upper rows correspond to the results presented in the "TX Measurement" view.
For a description, see
Chapter 4.3.2.6, "View TX Measurement"
The row "Reliability" provides a reliability indicator for each preamble. For a description
of the individual values, see
Chapter 4.5.1.5, "Reliability Indicator"
For query of the table contents via remote control, see
PRACh:MODulation:PREamble<Number>?
etc.
4.3.2.4
View I/Q Constellation
This single-preamble view shows the symbols as points in the I/Q plane.
Figure 4-8: I/Q constellation diagram
An NPRACH preamble signal is not modulated. So all 20 symbols are on a single point
in the I/Q plane. It would be hard to read such an I/Q diagram.
To improve the usefulness of the diagram, the measurement maps the four symbol
groups to the positions of QPSK symbols. The first symbol group is on the upper right.
The other symbol groups follow anti-clockwise (2
nd
on upper left, 3
rd
on lower left, 4
th
on lower right).
So in each QPSK position, you see the five symbols of a symbol group.
For the elements on the right, refer to
Chapter 4.3.2.9, "Common View Elements"
For query of the diagram contents via remote control, see
.
GUI Reference
深圳德标仪器
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