JD700B Series User’s Guide
689
Measurement example
Figure 410 Frame measurement with RFoOBSAI LTE-FDD signal analyzer
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 RFoOBSAI signal analysis” on page
693 for more information.
Conducting time alignment error measurement
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.
Making a measurement
Procedure
1
Press the
MEASURE
hot key to select the measurement mode.
2
Select
Signal Analyzer > LTE-FDD > Modulation Analysis > Time Alignment Error
.
3
Configure test parameters as described in the “Configuring test parameters” on page 669.
4
Press the
MEASURE SETUP
hot key and set the measurement setups as described in the
“Setting measure setup” on page 671.
5
Toggle the
Antenna Config
soft key and select
Ant0
or
Ant1
as needed.
6
Toggle the
Physical Cell ID
soft key and select
Auto
or
Manual
as desired:
Auto:
Lets the instrument detect the Physical Cell ID for the LTE signal automatically.
Manual:
Sets a specific Physical Cell ID for the LTE signal manually in order to speed up
the synchronization.
7
Depending on your selected NEM, you may need to turn on or off the inversion of the I and Q
order by toggling the
IQ Swap
soft key and selecting
On
or
Off
.
8
Optional
. To select the cyclic prefix, complete the following steps:
Press the
Miscellaneous
soft key.
Toggle the
Cyclic Prefix
soft key and select
Normal
or
Extended
. See “Appendix E –
Cyclic prefix table” on page 784 for OFDM parameter details by different bandwidth.
9
Check your measurement result displayed on the screen.
10
To clear current (C) and history (H) status of OBSAI alarm on LOS and LOF and start a new
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