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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 534 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.
–
To set the threshold for PDSCH, complete the following steps:
a
Press the PDSCH Threshold soft key.
b
Enter a value by using the numeric keys.
c
Press the dB soft key.
–
To set the threshold for PDCCH, complete the following steps:
a
Press the PDCCH Threshold soft key.
b
Enter a value by using the numeric keys.
c
Press the dB soft key.
–
Toggle the PDCCH Mode soft key and select REG to calculate EVM based on Resource
Element Group or Avg to calculate EVM after adding up all the PDCCH signals from one
subframe.
–
Toggle the PDSCH Precoding soft key between On and Off to enable or disable the
PDSCH precoding.
JD700B Series User's Guide
Chapter 8 Using LTE - FDD Signal Analyzer
197
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