Chapter 9
Using LTE-TDD Signal Analyzer
322
JD700B Series User’s Guide
2
Press the
RF Test Limits > Channel Power
soft key, and then set the limits for the channel
power. Other RF test items are not used in the signal performance test.
3
Press the
Modulation Test Limits
soft key, and then enable test limits as desired.
4
Optional
. You can enable alarm sound that goes off if the measurement falls outside of the limit.
Toggle the
Beep
soft key between
On
and
Off
to enable or disable the beep sound.
5
Optional
. Go to
SAVE/LOAD > Save
, and then select
Limit
to save the limit settings.
See “Using save” on page 35 for more information.
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
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.
3
Press the
MIMO
soft key, and then select the antenna number option:
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.
4
Press the
Antenna Port
soft key, and then select the option:
Auto
,
0
,
1
,
2
, or
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.
5
Press the
Bandwidth
soft key, and then select the nominal channel bandwidth to be measured,
from the choices:
1.4 MHz
,
3 MHz
,
5 MHz
,
10 MHz
,
15 MHz
, and
20 MHz
.
6
Toggle the
RF Profile
soft key between
On
and
Off
to turn on or off the RF profiling such as
channel power and subframe frequency error.
7
Toggle the
Modulation Profile
soft key between
On
and
Off
to turn on or off the modulation
profiling such as P-SS, S-SS, Data - QPSK, Data – 16 QAM, and Data – 64 QAM.
8
Toggle the
MIMO Profile
soft key between
On
and
Off
to turn on or off the MIMO profiling such
as TX1 - RS0, TX2 - RS1, and time alignment error.
9
Toggle the
External Offset
soft key and select
On
to set the external offset value.
10
To save your settings and results, go to
SAVE/LOAD > Save
and then perform functions as you
desire. See “Using save” on page 35 for more information.
DAS test
The Distributed Antenna System (DAS) testing enables you to check the degradation of performance in the
signal transmission from a radio band to antennas distributed from it. You can save measurement values at
both the radio band and antennas and then compare results with percentage of changes. You can also save
test results in the
.csv
file format for ease of analysis.
Setting measure setup
Procedure
1
Press the
MEASURE SETUP
hot key.
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