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LTE Multi Evaluation Measurement
R&S
®
CMW-KM5xx/-KS5xx
528
User Manual 1173.9628.02 ─ 16
gin, with relative phase angles of 90 deg. The 16QAM and 64QAM modulation
schemes produce rectangular patterns with 16 and 64 points, respectively; see exam-
ple above.
If channel type PUCCH is detected, the constellation diagram shows the SC-FDMA
symbols in the frequency domain.
Constellation diagrams give a graphical representation of the signal quality and can
help to reveal typical modulation errors causing signal distortions.
See also: "I/Q Constellation Diagram" in the R&S
CMW user manual, chapter "System
Overview"
The LTE constellation diagram shows the following peculiarities:
●
The I/Q amplitudes correspond to the values that the R&S
CMW uses for the EVM
calculation: A possible I/Q origin offset is already subtracted out.
●
Due to the properties of the UL LTE signal, a pure I/Q imbalance causes circular
constellation points.
For the parameters on the right, see
chapter 3.2.6.14, "Common View Elements"
For query of the diagram contents, see
chapter 3.5.3.21, "I/Q Constellation Results
3.2.6.8
Detailed Views: RB Allocation Table
The Resource Block (RB) allocation table provides an overview of the detected RB
allocation, including the detected channel type as color coded information.
With carrier aggregation, separate tables are displayed for the PCC and the SCC.
Fig. 3-31: LTE Multi Evaluation: RB Allocation Table
General Description
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