Viavi CellAdvisor 5G, User Manual, Page: 236 / 359

Using 5G NR Signal Analyzer
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NOTE:
You cannot save the measurement as a Result. Logging as CSV and IQ Capture options are added. For more
details, see
Managing files .
Conducting PDSCH analysis
PDSCH Constellation
In 5G NR, PDSCH is defined as the physical downlink channel that carries user data. DM-RS and PT-RS are the reference signals
associated with PDSCH. These signals are generated within the PDSCH allocation. DM-RS is used for channel estimation as part of
coherent demodulation of PDSCH. CellAdvisor 5G enables PDSCH EVM setting and shows its demodulated data as constellation.
Setting measure setup
1 Tap the Setup ( )icon on the side bar.
2 Tap Bandwidth/SSB SCS and select the Setting in the pop-up window based on your need. SSB is abbreviation for
Synchronization Signal Block or SS Block and it actually refers to Synchronization PBCH block since the synchronization signal
and PBCH channel are packed as a single block that always moves together. SSB should be detected first in 5G NR frame.
The following table shows the setting criteria based on the operating frequency.
Operating Frequency
L
Case SCS Slots in a burst period (slot duration)
< 3 GHz (FR1) 4
A
{2,8} +14*n
15 kHz 5 (1 ms)
B
{4,8,16,20} +28*n
30 kHz 10 (0.5 ms)
C
{2,8} +14*n
30 kHz 10 (0.5 ms)
3 to 6 GHz (FR1) 8
A
{2,8} +14*n
15 kHz 5 (1 ms)
B
{4,8,16,20} +28*n
30 kHz 10 (0.5 ms)
C
{2,8} +14*n
30 kHz 10 (0.5 ms)
> 6 GHz (FR2)
64
D
{4,8,16,20} +28*n
120 kHz 40 (0.125 ms)
E
{8,12,16,20,32,36,40,44} +56*n
240 kHz 80 (62.5 ms)
3 Tap SSB Frequency to set SSB location using the on-screen keyboard.
4 Tap GSCN to set SSB location using the on-screen keyboard.
Based on the GSCN input frequency, the SSB frequency changes automatically.
5 Tap Sync Raster/SCS Offset to set the sync raster resolution to 180 kHz (FR1) or to 720 kHz (FR2) for carrier frequency center
using the on-screen keyboard.
The following table shows the sync raster offset range and sync SCS offset range per SSB SCS and sync raster/SCS
resolution.