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Using LTE/LTE-A TDD Analyzer
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Spectrum Emission Mask measurement with LTE/LTE-A TDD Analyzer
If Lower Peak or Upper Peak indicates Fail, the mask line becomes red.
NOTE:
If the Trace View is set to Off, the Reference Power, Lower Peak, and Upper Peak is not shown. If the Trace View
is set to On and the Trace Type is selected other than Clear Write, the Reference Power, Lower Peak, and Upper
Peak is shown with value and
"*" at the end of the value.
ACLR
The Adjacent Channel Power Ratio (ACPR) designated by the 3GPP LTE/LTE-A specifications as the Adjacent Channel Leakage
Power Ratio (ACLR), is the power contained in a specified frequency channel bandwidth relative to the total carrier power. It may
also be expressed as a ratio of power spectral densities between the carrier and the specified offset frequency band.
Setting measure setup
After configuring spectrum measurement in " Configuring Spectrum Measurements ", you can set the measure setup to continue your
measurement. The measurement settings can be saved and recalled as a file by selecting File Type as Setup and load the file onto
the instrument using the
Save/Load icons on the side bar.
1 Tap the Setup ( )icon on the side bar.
2 Tap Bandwidth and select the value from the following choices: 1.4 MHz , 3 MHz , 5MHz , 10 MHz , 15 MHz , or 20 MHz .
You can also tap the rectangle with value, under the chart screen and input the value
using the on-screen keyboard.
3 Tap Subframe Number to set the number of subframe using the on-screen keyboard.
4 Optional. Tap Physical Cell ID and select the type, Manual or Auto .
Auto lets the instrument detect the Physical Cell ID for the LTE signal automatically, and Manual sets a specific Physical Cell
ID for the LTE signal manually in order to speed up the synchronization with a BTS.
Setting limit
1 Tap Menu > Limit .
2 Tap to switch the Test Limits to On or Off to enable or disable Pass/Fail indication.
The result table color for Pass is green, and the result table color for Fail is red.
3 Optional. Tap the Save hot key on the side bar and select the save option form the choices available for your measurement
mode.