JDS Uniphase CellAdvisor JD780A Series, User Manual

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JD780A Series Analyzers
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Using LTE
– TDD Signal Analyzer
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.
Measurement example
Figure 131 Data channel measurement with LTE - TDD signal analyzer