Keysight Technologies C Series - Page 368

368 Keysight N9915-90020 User’s Guide
Over–the–Air Measurements (OTA) – LTE FDD Option 370, LTE TDD Option 371, 5G TF
Option 377, 5G NR / 5G NR EVM Conducted Option 378
How to Set Up Over–the–Air (OTA) Mode Settings
— Then Channel Raster (Option 378 5G NR /5G NR EVM Only) opens
the Channel Raster softkey menu.
— Then
Channel ARFCN Sets the Absolute Radio-Frequency
Channel Number signal to be measured. Setting an ARFCN
automatically sets a corresponding Center frequency for
the component carrier.
— Then
Center sets the ARFCN center frequency.
— Then
Offset sets the offset from the Center frequency.
— Then
Sync Raster (Option 378 5G NR and 5G NR EVM Only) opens a
softkey menu, where you can set the Global Synchronization raster
Channel using wider SSB frequency search. Sync ARFCN is coupled
with Sync GSCN. ARFCN and GSCN minimum and maximum values
vary with band setting and licensed frequency.
— Then
Sync ARFCN sets the ARFCN reference signals to be
synchronized.
— Then Sync GSCN sets the GSCN signals to be
synchronized.
— Then Center sets the GSCN center frequency.
— Then
Offset sets the offset from the Center frequency.
— Then
Back
7. Select Trace 6—choose:
— Window 1 2 3 4
— Then
Win State OFF ON to ON
— Then
Display Type
— Table or
—
Bar Chart or
—
Spectrum or
—
Strip Chart or
—
Constellation (5G NR EVM only) or
—
Frame Summary (5G NR EVM only)
The Spectrum view in 5G TF uses a center frequency that is +2.6 MHz
offset from the carrier’s center frequency. This is done so that FieldFox can
capture the necessary xPBCH (physical broadcast channel) information to
demodulate the signal. Be aware that all of the instrument’s displayed
numbers are rounded to three significant digits (e.g., 5.0026 GHz is
displayed as 5.003 GHz).