In-band Emissions (5G NR/5G-Advanced)

There are two types of traces in the Trace > Data > Demod and MIMO Multiple Input, Multiple Output: A physical layer (PHY) configuration in which both transmitter and receiver use multiple antennas. menus that display component carrier data: CCn (component carrier is fixed), and Selected Display CC (component carrier is dynamically selected using the Display parameter). See About Per-Carrier Trace Types for more information.

In-band Emissions shows the component carrier's resource block power spectrum for the data specified by Measurement Interval and Measurement Offset.

When more than one carrier is defined in the Aggregation Table, "(CCn)" will appear in the title of this trace, where "n" is the number of the component carrier whose data is displayed in the trace. Select the desired component carrier number using the Configuration > Carriers > Display parameter.

The In-band Emissions trace has the following characteristics:

In-band Emissions always includes Non-alloc signals.
In-band Emissions includes autogenerated limit test for each slot. To keep the trace uncluttered, limit line is drawn only for the slot with the worst emissions.
RB Power levels are normalized such that the average active RB power is 0 dB.
Any IQ Offset (carrier leakage) present in the signal is not compensated.

Resource block points whose power exceeds the limit are drawn as red Xs.

The marker readout also shows the result of the In-band Emissions limit test as either PASS or FAIL, with the location of the resource block that has passed with the tightest margin or failed with the widest margin.

Although the limits for this trace are auto-generated, the limits can be customized by performing the following steps:

Select the In-band Emissions trace by clicking the trace title.
Click Utilities > Limit Tests > From Trace

This will open the Limit Test Editor dialog with limits extracted from the In-band Emissions trace.
Modify the limit test
1. Select the Upper limit and click Edit.
2. Click the Points tab and modify the limit line points.
3. Type a name for the limit line in the Name field and click OK to save the limit line.
4. Type a name for the limit test in the Name field and click OK to save the limit test.
Apply the modified limit test
1. Click Markers > Limits…
2. Select the modified limit test.

The selected limit test will continue to be applied in all subsequent measurement sweeps.

To revert to auto-generated limit lines, select the In-band Emissions trace, click Markers > Limits… and select <Limit Test from Trace>.

For more information about limit lines, see the About Limit Lines topic.