JDS Uniphase CellAdvisor JD780A Series, User Manual

Page: 285 / 592

JD780A Series Analyzers
Using LTE
– TDD Signal Analyzer
285
4.
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.
5.
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.
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.
Press the Uplink-Downlink Configuration soft key, and then select the number of
uplink/downlink between one and six.
8.
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 031 LTE-
Advanced TDD 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 031 LTE-Advanced TDD 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 set the delay, complete the following steps:
a. Press the Delay soft key to set the amount of delay in µs.
b. Enter a value by using the numeric keys. You can also use the rotary knob.
c. Press the µs soft key.
NOTE
The Delay setting is used only when there is a time offset in the signals to be measured.
–
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.
–
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.
–
Toggle the PDSCH Precoding soft key between On and Off to enable or disable the
PDSCH precoding.