User`s guide

Agilent PXT Wireless Communications Test Set
User’s Guide
216
Power Spectrum Measurement
Key Path:
Mode > SA > LTE > UL Demodulation > Power Spectrum
Figure 6-15: Power Spectrum measurement
This measurement displays a frequency domain graphic of the subcarrier powers for a selected symbol,
and time domain graphics of the IQ signal over a radio frame. Additionally, the numeric results presented
by the Constellation measurement are also presented here.
The measurement can be used to measure the power of individual resource elements in the uplink
allocation.
Measurement Setup
Uplink Config
The green outlined box on the IQ time domain (Figure 6-10: Power Spectrum measurement
), above)
indicates the subframe being measured. Use the Target Subframe setting in the Uplink Config menu to
select the required subframe for this measurement.
Access the following settings by selecting the Meas Setup front-panel key.
The Symbol setting is the symbol index within the selected subframe. The selected symbol is indicated on
the IQ time domain screen by a blue outlined box.
The frequency domain graphic shows the subcarrier powers for the selected symbol. The Subcarrier
setting is used to move the marker on the frequency domain graphic. The marker result, power in dBm, is
displayed in the top right-hand corner of the frequency domain graphic. This is the power of the resource
element selected by symbol and subcarrier.