Chapter 8
Using LTE-FDD Signal Analyzer
JD700B Series User’s Guide
265
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
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.
4
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.
5
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 030 LTE-
Advanced FDD 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 030 LTE-Advanced FDD is not
installed or if the MIMO is set to 2x2, the antenna ports 2 and 3 are disabled.
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.
To turn the Multimedia Broadcast Multicast Service (MBMS) feature on or off, 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, the
measurement item “MBSFN RS” appears in the result table.
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.
6
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 limit for OTA control channel
Procedure
1
Press the
LIMIT
hot key.
2
Select the test item(s) and set the limit(s) as needed:
To set the limit for
Select
Set
P-SS error vector magnitude
P-SS EVM
High Limit
S-SS error vector magnitude
S-SS EVM
High Limit
RS error vector magnitude
RS EVM > RS0 EVM
High Limit
