Chapter 16
Performing RFoCPRI Testing
612
JD700B Series User’s Guide
Measurement example
Figure 372 Frame measurement with RFoCPRI 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 RFoCPRI signal analysis” on page
616 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 592.
4
Press the
MEASURE SETUP
hot key, and then set the following parameters:
Measurement setups as described in the “Setting measure setup” on page 594
Rx Parameters as described in the “Configuring Rx Parameters” on page 594
5
Toggle the
Antenna Config
soft key between
Ant0
and
Ant1
.
6
Toggle the
Physical Cell ID
soft key between
Auto
and
Manual
:
Auto:
Detects 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 between
On
and
Off
.
8
Optional
. To select the cyclic prefix, complete the following steps:
Press the
Miscellaneous
soft key.
Toggle the
Cyclic Prefix
soft key to
Normal
or
Extended
. See “Appendix E – Cyclic prefix
table” on page 784 for OFDM parameter details by different bandwidth.