5GNR Constellation

To select constellation measurement go to main menu and press MEASURE > MEASUREMENT >Constellation. The constellation measurements are set up using the SETUP Menu (5GNR Constellation). 5GNR constellation measurement displays the demodulated symbol point location of a selected SSB beam on an IQ coordinate plot, which illustrates the constellation of a particular modulation format. The instrument displays QPSK constellation with a PCI summary and power tabular data. An example 5GNR constellation display and measurement is shown in Figure: 5GNR Constellation Measurement.

5GNR Constellation Measurement

1. 5GNR Analyzer Status Panel: Each measurement features a unique status panel that displays settings and information relevant to the current measurement and view settings. This panel provides quick access to the measurement frequency, subcarrier spacing, channel bandwidth, and band configuration. See Status Panel (5GNR Constellation). 2. PCI Summary: This area shows the physical cell ID summary data, including the sector ID, cell group number, frequency error, time offset, and sync status. Sync status can indicate if there is a PSS, SSS, or Beam Index failure, Full Sync, or an Unknown condition. Also noted is the instrument’s reference clock accuracy of Internal, External, or GNSS (GPS) high accuracy (requires GPS). 3. Constellation: This area displays the demodulated symbol point location on an IQ coordinate plot. Points are drawn in colors that are associated with the symbol point density. Warmer colors (red/orange) indicate a higher symbol density where cooler colors (cyan/blue) indicate lower symbol density. The ideal symbol reference point location overlay can be toggled on or off via the SETUP menu. 4. Channel Summary: For the currently selected beam, shows the RMS error vector magnitude (EVM), peak EVM (@ subcarrier/symbol) and received power in dBm for each block measurement: • Beam: Shows the value of the selected 5GNR SSB beam. • PBCH-DMRS Power: In 5GNR measurements, the PBCH decoding relies on a demodulation reference signal (DMRS, which is a physical layer reference signal used for decoding) rather than a cell specific reference signal (CRC). • PSS Power: The primary synchronization signal provides the primary frame boundary (i.e., the position of the first symbol in the frame). • SSS Power: Similar to PSS, the secondary synchronization signal provides the secondary sub-frame boundary. • RMS EVM: Shows the percentage value of all the error vectors between the reconstructed ideal signals and the received signals divided by the RMS value of the ideal signals. • Peak EVM: Shows the dominant cell’s peak EVM of all the error vectors between the reconstructed ideal signals and the received signals, divided by the RMS value of the ideal signals. 5. SETUP Menu: The constellation measurement settings are configured in the SETUP menu. See SETUP Menu (5GNR Constellation).

SETUP Menu (5GNR Constellation)
-	MODULATION Selects the modulation format (only QPSK is available). DATA SELECT Selects the data format (only Physical Broadcast Channel (PBCH) is available). BEAM SELECT: Selects the 5GNR SSB beam for the demodulation and display. Minimum beam is 0 and Maximum is 63 REF POINTS Toggles the ideal reference point locations on or off. PRESET SETUP Presets the SETUP menu to default settings.

Status Panel (5GNR Constellation Measurement)
	SWEEP Toggles the current sweep setting between continuously or sweep once. Refer to Setting Sweep Parameters. SWEEP ONCE When sweep is set to single sweep, SWEEP ONCE updates the measurement display. Data continues to be captured in the background. BAND Select MANUAL, GLOBAL ALL or one of the predefined bands. Selecting MANUAL hides ARFCN and GSCN settings. Selecting a predefined band or GLOBAL ALL activates ARFCN and GSCN settings. REF LEVEL Sets the reference level of the top graticule line in the selected units. If the reference level offset is not zero, OFFSET REF LEVEL is displayed at this location. Refer to Setting Amplitude Parameters. SCALE/DIV Sets the graticule scale/division for log-based units. This setting does not apply to linear units. CHANNEL BW Sets the measurement channel bandwidth. The available bandwidth settings depend on the selected band and bandwidth option installed in the instrument. Refer to “Options Settings” section in Instrument Overview chapter of user guide. SUBCARRIER SPACING Sets the subcarrier spacing. The available input range is dependent on the selected band. CENTER FREQUENCY When the band is set to MANUAL, sets the center frequency of the measurement channel. Changing the center frequency sets the band to MANUAL. SSB OFFSET SSB is the Synchronous Signal Block. The SSB Offset sets the frequency offset between the SSB and the overall resource block. ATTEN LEVEL When auto attenuation is off, sets input attenuation. PRE AMP Toggles the low-noise front-end preamplifier on or off. Refer to Setting Amplitude Parameters. TRACES Displays the current status of up to six traces in the status panel. The trace card includes the trace number, type, mode, and detector type. The active trace will show a highlighted background with the mode and detector type restated under the table. Selecting a trace in the status panel activates the pressed trace and opens the TRACE menu, allowing you to select and set up an individual trace as desired. Refer to Setting Trace Parameters. FREQ REFERENCE Indicates the current frequency reference source of Internal High Accuracy (used after GPS has lost sync, but while the internal clock still has good GPS reference), Internal Standard Accuracy, External, or GNSS (GPS) Hi Accy (requires GPS). The instrument automatically selects the frequency reference in the following order of priority: external, GPS, then the internal time base.


	Anritsu Company 1-800-ANRITSU 10450-00078, Rev. A