Chapter 8
Using LTE-FDD Signal Analyzer
244
JD700B Series User’s Guide
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
To set the threshold for PDSCH, complete the following steps:
Press the
PDSCH Threshold
soft key.
Enter a value by using the numeric keys.
Press the
dB
soft key.
5
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.
6
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 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, either PMCH or
PDSCH appears on the screen depending on the detected channel.
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.
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.
Setting display
You can use the
TRACE/DISPLAY
hard key to change the display mode to Display Channel and NB-IoT.
Procedure
1
Press the
TRACE/DISPLAY
hard key.
2
Press the
Display Channel
soft key.
3
Select the display mode from the choice:
PDSCH
,
PMCH
, and
Both
.
4
Toggle the
NB-IoT
soft key between
On
and
Off
to display or dismiss the result of the selected
resource block. If this setting is on, the
MARKER
hard key is activated.
5
To adjust the NB-IoT PBR Index, press the
NB-IoT PBR Index
soft key, and then turn the rotary
knob clockwise or counter clockwise.