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Chapter 5 Using LTE/LTE-A FDD Analyzer
Conducting modulation measurement
Conducting modulation measurement
The following sections describe how to conduct modulation analysis.
Constellation
The constellation is used to observe some aspects of modulation accuracy and can
reveal certain fault mechanisms such as I/Q amplitude imbalance or quadrature imbal-
ance. It displays constellation diagram by modulation types.
Setting measure setup
After configuring the spectrum measurement in
on page
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.
To set measure setup
1
Tap the Setup (
2
Tap Bandwidth and select the value from the following choices: 1.4 MHz, 3 MHz,
5 MHz, 10 MHz, 15 MHz, or 20 MHz.
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.
–
–
5
Optional. Tap CFI and select the type Manual or Auto.
–
–
6
Optional. Tap PHICH Ng to set the number of PHICH groups (Ng): 1/6, 1/2, 1, 2,
E-1/6, E-1/2, E-1, or E-2.
Page 96
9, you can set the measure setup to continue your measurement. The
) icon in the side bar.
Auto lets the instrument detect the Physical Cell ID for the LTE signal auto-
matically.
Manual sets a specific Physical Cell ID for the LTE signal manually in order to
speed up with the synchronization with a BTS.
Auto lets the instrument set the number of OFDM symbols used for transmit-
ting PDCCHs in a subframe.
Manual sets the number of OFDM symbols manually.
NOTE
The set of OFDM symbols that can be used for PDCCH in a subframe is given
by 0, 2, 3 or 4 in 1.4 MHz bandwidth and 1, 2 or 3 in another bandwidth.
SPA06MA-O User's Guide
"Configuring spectrum measurements"
22145360, R005
April 2021
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