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JD780A Series Analyzers
a.
b.
c.
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.
b.
c.
–
To set the threshold for PDCCH, complete the following steps:
a.
b.
c.
–
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.
Measurement example
Figure 135 Subframe measurement with LTE - TDD signal analyzer
1) Regular view
294
Press the Delay soft key to set the amount of delay in µs.
Enter a value by using the numeric keys. You can also use the rotary knob.
Press the µs soft key.
Press the PDSCH Threshold soft key.
Enter a value by using the numeric keys.
Press the dB soft key.
Press the PDCCH Threshold soft key.
Enter a value by using the numeric keys.
Press the dB soft key.
Using LTE – TDD Signal Analyzer
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