Chapter 8
Using LTE-FDD Signal Analyzer
JD700B Series User’s Guide
237
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
. Toggle the
CFI
soft key and select
Auto
or
Manual
as desired:
Auto:
Lets the instrument set the number of OFDM symbols used for transmitting PDCCHs
in a subframe.
Manual:
Sets the number of OFDM symbols manually. The set of OFDM symbols that can
be used for PDCCH in a subframe is given by
0
,
2
,
3
or
4
in 1.4 MHz bandwidth and
1
,
2
, or
3
in other bandwidths.
6
Optional
. Press the
PHICH Ng
soft key, and then select the option for the number of PHICH
groups (Ng):
1/6
,
1/2
,
1, 2
,
E-1/6
,
E-1/2
,
E-1
,
or
E-2
.
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 or 4x1
combiner or an antenna.
8
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, the
measurement item “MBSFN RS” appears in the result table and either PMCH or PDSCH
appears as well 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.
Press the
PDSCH Modulation Type
soft key, and then select the modulation type option:
Auto
,
QPSK
,
16 QAM
,
64 QAM
,
E-TM3.3
,
E-TM3.2
,
E-TM3.1
,
E-TM2
,
E-TM1.2
, and
E-TM1.1
. If two or more modulation types are used in a frame, select
Auto
. If the PDSCH
uses the same modulation type in a frame or in a subframe, select a specific modulation
type to get more accurate EVM.
NOTE
If you have installed a license for the option
032 LTE-FDD 256 QAM Demodulator
on
your CellAdvisor, you will have additional PDSCH modulation types of
256 QAM
,
E-TM3.1a
, and
E-TM2a
.
To set the threshold for PDSCH, complete the following steps:
Press the
PDSCH Threshold
soft key.