Chapter 9
Using LTE-TDD Signal Analyzer
JD700B Series User’s Guide
313
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 283, 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:
Press the
Bandwidth
soft key.
Select the bandwidth option from the choices:
1.4 MHz
,
3 MHz
,
5 MHz
,
10 MHz
,
15 MHz
,
and
20 MHz
.
3
Optional
. 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 with a BTS.
4
Optional
. Press the
Miscellaneous
soft key, and then do the following 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:
Press the
Delay
soft key to set the amount of delay in µs.
Enter a value by using the numeric keys. You can also use the rotary knob.
Press the
µs
soft key.
NOTE
The Delay setting is used only when there is a time offset in the signals to be measured.
To select the cyclic prefix, toggle the
Cyclic Prefix
soft key and select
Normal
or
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