JDS Uniphase CellAdvisor JD780A Series, Руководство пользователя

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JD780A Series Analyzers
250
Using LTE - FDD Signal Analyzer
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.
To select the subframe number to be measured, complete the following steps:
a. Press the Subframe No soft key.
b. Enter a value by using the numeric keys. You can also use the rotary knob.
c. Press the Enter soft key.
4.
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.
5.
Optional . To set the threshold for PDSCH, complete the following steps:
a. Press the PDSCH Threshold soft key.
b. Enter a value by using the numeric keys.
c. Press the dB soft key.
6.
To set the time cursor at a specific position, complete the following steps:
a. Toggle the Time Cursor soft key and select On .
b. Turn the rotary knob to move the time cursor. You can also enter a value and then press the
Enter soft key.
NOTE
Enabling the time cursor puts the measurement on hold and you can make post-
processing analysis for each measurement over time using the time cursor.
7.
To start a new measurement, press the Reset/Restart soft key.
8.
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.
–
To select the cyclic prefix, toggle the Cyclic Prefix soft key and select Normal or
Extended . See
“Appendix E – Cyclic prefix table” on page 575 for OFDM parameter details
by different bandwidth.
9.
Optional . Go to SAVE/LOAD > Save , and then select the save option from the choices available
for your measurement mode. See
“Using save” on page 31 for more information.