JDS Uniphase CellAdvisor JD780A Series, Руководство пользователя

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JD780A Series Analyzers
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Using LTE
– TDD Signal Analyzer
Using marker
If you turn the Chart view on, you can use the MARKER hard key to place the marker at a specific
symbol.
Procedure
1.
Press the MARKER hard key.
2.
Toggle the Marker View soft key between On and Off to display or dismiss the marker on the
chart.
3.
Press the Symbol soft key to select the symbol number, to which the marker is placed.
4.
Enter a value by using the numeric keys.
5.
Press the Enter soft key.
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 265, you
can continue your measurement. The measurement settings can be saved and recalled as a file. You
can also use JDViewer, PC application software to configure a measure setup, save as a file, and load
the file on to the instrument.
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 031 LTE-
Advanced TDD 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.
–
To assign a antenna port number automatically or manually, press the Antenna Port soft
key and select the option: Auto , 0 , 1 , 2 , and 3 . If the option 031 LTE-Advanced TDD is not
installed or if the MIMO is set to 2x2, the antenna ports 2 and 3 are disabled.
–
To set the delay, complete the following steps:
a. Press the Delay soft key to set the amount of delay in µs.
b. Enter a value by using the numeric keys. You can also use the rotary knob.