JDS Uniphase CellAdvisor JD780A Series, Руководство пользователя

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JD780A Series Analyzers
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Using LTE - FDD Signal Analyzer
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.
NOTE
For MBMS testing, this subframe number must be neither 0 nor 5 as these subframes 0
and 5 are not available for MBMS and it must be set to the MBMS transmitted channel
’s
subframe number.
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 . 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 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 030 LTE-Advanced FDD is not
installed or if the MIMO is set to 2x2, the antenna ports 2 and 3 are disabled.
–
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.
–
To turn the Multimedia Broadcast Multicast Service (MBMS) feature on or off, toggle the
MBMS soft key and select On or Off . For proper MBMS testing, you need to set the
Subframe No with the same PMCH subframe number. If this setting is on, the
measurement item
“MBSFN RS” appears in the result table.
–
To set the Multicast Broadcast Single Frequency Network (MBSFN) detection automatically
or manually for MBMS testing, toggle the
MBSFN soft key and select Auto or Manual . An
automatically detected or manually entered MBSFN ID appears on the screen.
6.
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.
Setting limit for OTA control channel
Procedure
1.
Press the LIMIT hot key.
2.
Select the test item(s) and set the limit(s) as needed:
To set the limit for Select Set
P-SS error vector magnitude P-SS EVM High Limit
S-SS error vector magnitude S-SS EVM High Limit
RS error vector magnitude RS EVM > RS0 EVM
RS EVM > RS1 EVM
RS EVM > RS2 EVM
RS EVM > RS3 EVM High Limit