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Chapter 8 Using LTE - FDD Signal Analyzer
Procedure
1
Press the MARKER hard key.
2
Press the Channel soft key to select the channel to be displayed in the IQ diagram.
The channel P-SS is selected by default.
3
Turn the rotary knob to move the highlight from one to another in the channel summary table.
4
Toggle the Marker View soft key between On and Off to display or dismiss the result of the
selected channel.
Subframe
The Subframe measures the modulation accuracy of all the data and control channels at the specified
subframe (1 ms).
Setting measure setup
After configuring test parameters as described in the "Configuring test parameters" on page 173, you
can continue your measurement. The measurement settings can be saved and recalled as a file.
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
To select the subframe number to be measured, complete the following steps:
a
Press the Subframe No soft key.
b
Enter a value by using the numeric keys. You can also use the rotary knob.
NOTE
For MBMS testing, this subframe number must be neither 0 nor 5 as these subframes 0
and 5 are not available for MBMS and it must be set to the MBMS transmitted channel's
subframe number.
c
Press the Enter soft key.
4
Optional. Toggle the Cell ID soft key and select Auto or Manual as desired:
–
Auto: Lets the instrument detect the Cell ID for the LTE signal automatically.
–
Manual: Sets 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: Lets the instrument set the number of OFDM symbols used for transmitting PDCCHs
in a subframe.
–
Manual: Sets 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
Toggle the EVM Detection Mode soft key and select Single or Combine as desired:
–
Single: Testing on one single antenna connected to your JD700B series with a cable.
–
Combine: Testing on multiple antennas connected to your JD700B series with a 2x1 or 4x1
combiner or an antenna.
196
JD700B Series User's Guide
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