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Setting measure setup
After configuring test parameters as described in the "Configuring test parameters" on page 197, you
can continue your measurement. The measurement settings can be saved and recalled as a file.
Procedure
1.
Press the MEASURE SETUP hot key.
2.
To set the nominal channel bandwidth to be measured, complete the following steps:
a.
Press the Bandwidth soft key.
b.
Select the bandwidth option: 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, or 20 MHz.
3.
Optional. Toggle the Cell ID soft key and select Auto or Manual as desired:
–
Auto: to let the instrument detect the Cell ID for the LTE signal automatically.
–
Manual: to set a specific Cell ID for the LTE signal manually in order to speed up the
synchronization with a BTS.
4.
Optional. Toggle the CFI soft key and select Auto or Manual as desired:
–
Auto: to let the instrument set the number of OFDM symbols used for transmitting PDCCHs
in a subframe.
–
Manual: to set 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.
5.
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.
6.
Toggle the EVM Detection Mode soft key and select Single or Combine as desired:
–
Single: Testing on one single antenna connected to your JD780A series with a cable.
–
Combine: Testing on multiple antennas connected to your JD780A series with a 2x1 or 4x1
combiner or an antenna.
7.
Optional. Press the Miscellaneous soft key, and then do the following(s) 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. If this setting is on, the measurement items MBSFN
RS, PMCH QPSK, PMCH 16 QAM, and PMCH 64 QAM appear 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.
–
To select the cyclic prefix, toggle the Cyclic Prefix soft key and select Normal or
Extended. See "Appendix E – Cyclic prefix table" on page 575 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.
Using LTE - FDD Signal Analyzer
JD780A Series Analyzers
225
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