JDS Uniphase CellAdvisor JD780A Series, User Manual

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JD780A Series Analyzers
Using LTE - FDD Signal Analyzer
227
Figure 99 Frame measurement with LTE - FDD signal analyzer (MBMS On)
NOTE
You can use the LIMIT hot key to analyze your measurements with the user-definable
limit and Pass/Fail indication. See
“Setting limit for modulation tests” on page 231 for
more information.
Time alignment error
In eNode B supporting Tx Diversity transmission, signals are transmitted from two or more antennas.
These signals shall be aligned. The time alignment error in Tx diversity is specified as the delay
between the signals from two antennas at the antenna ports.
Setting measure setup
After configuring test parameters as described in the
“Configuring test parameters” on page 197, you
can continue your measurement. The measurement settings can be saved and recalled as a file.
Procedure
1.
Press the MEASURE SETUP hot key.
2.
To set the nominal channel bandwidth to be measured, complete the following steps:
a. Press the Bandwidth soft key.
b. Select the bandwidth option: 1.4 MHz , 3 MHz , 5 MHz , 10 MHz , 15 MHz , or 20 MHz .
3.
Optional . Toggle the Cell ID soft key and select Auto or Manual as desired:
–
Auto : to let the instrument detect the Cell ID for the LTE signal automatically.
–
Manual : to set a specific Cell ID for the LTE signal manually in order to speed up the
synchronization with a BTS.
4.
Optional . Press the Miscellaneous soft key, and then do the following(s) as needed:
–
To select the number of antenna ports, toggle the MIMO soft key and select 2x2 or 4x4 .
This MIMO (Multiple Input Multiple Output) setting is activated only if the option 030 LTE-
Advanced FDD is installed with a license number. If not, the instrument sets this option to
2x2 by default. A 2x1 or 4x1 RF combiner is also required to able to test on MIMO
channels.