JD700B Series User’s Guide
685
Making a measurement
Procedure
1
Press the
MEASURE
hot key to select the measurement mode.
2
Select
Signal Analyzer > LTE-FDD > Modulation Analysis > Subframe
.
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
To select the subframe number to be measured, complete the following steps:
Press the
Subframe No
soft key.
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.
Press the
Enter
soft key.
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
Toggle the
EVM Detection Mode
soft key and select
Single
or
Combine
as desired:
Single:
Testing on one single antenna connected to your JD700B series with a cable.
Combine:
Testing on multiple antennas connected to your JD700B series with a 2x1
combiner or an antenna.
8
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
.
9
Optional
. Press the
Miscellaneous
soft key, and then set other miscellaneous setups as
described in the following section.
10
Check your measurement result displayed on the screen.
11
To clear current (C) and history (H) status of OBSAI alarm on LOS and LOF and start a new
monitoring, press the
MEASURE SETUP
hot key and then the
Clear History
soft key.
12
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 35 for more information.
Setting other miscellaneous setups
Procedure
1
To assign a antenna port number automatically or manually, press the
Antenna Port
soft key
and select the option:
Auto
,
0
, and
1
.
2
To select the cyclic prefix, 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.
3
To turn on or off the Multimedia Broadcast Multicast Service (MBMS) feature, 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, either PMCH or PDSCH appears on the
screen depending on the detected channel.
4
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.
5
To select the PDSCH modulation type, press the
PDSCH Modulation Type
soft key and then
select the option from the choices:
Auto
,
QPSK
,
16 QAM
,
64 QAM
,
E-TM3.3
,
E-TM3.2
,
E-TM3.1
,
E-TM2
,
E-TM1.2
, and
E-TM1.1
.
NOTE
If two or more modulation types are used in a frame, select
Auto
. If the PDSCH uses the
