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Multipath profile
The Multipath Profile enables you to determine RF environmental conditions of testing area. It
indicates the amount of power of the dominant pilot signal that is dispersed outside the main
correlation peak due to multipath echoes that are expressed in dB. This value should be very small
ideally.
The multipath profile is the result of portions of the original broadcast signal arriving at the receiving
antenna out of phase. This can be caused by the signal being reflected off objects such as buildings,
or being refracted through the atmosphere differently from the main signal.
Setting measure setup
After configuring test parameters as described in the "Configuring test parameters" on page 234, you
can continue your measurement.
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 from the choices: 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz,
and 20 MHz.
3
Toggle the Display soft key and select RS or Sync.
The RS Window soft key becomes activated if RS is selected.
4
Press the RS Window soft key, if RS is selected, and then select the RS window option: 2 µs,
4 µs, or 8 µs.
5
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 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 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.
6
Optional. Go to SAVE/LOAD > Save, and then select the save option from the choices available
for your measurement mode. See "Using save" on page 32 for more information.
JD700B Series User's Guide
Chapter 9 Using LTE - TDD Signal Analyzer
283
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