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NOTE
You can use the LIMIT hot key to analyze your measurements with the user-definable
limit and Pass/Fail indication for the Spectral Flatness. See "Setting limit for modulation
tests" on page 436 for more information.
EVM vs. subcarrier
The EVM vs Subcarrier shows the error vector magnitude representing the average constellation error
of WIMAX OFDMA subcarriers.
Setting measure setup
After configuring test parameters as described in the "Configuring test parameters" on page 414, you
can continue your measurement. The measurement settings can be saved and recalled as a file. You
can also use JDViewer, PC application software to configure a measure setup, save as a file, and load
the file on to the instrument.
Procedure
1
Press the MEASURE SETUP hot key.
2
Press the System Config soft key, and then do the following:
a
Press the Bandwidth soft key, and then select the nominal channel bandwidth to be
measured from the following choices:
–
–
–
b
Toggle the Frame Length soft key and select 5 ms or 10 ms.
c
Press the TTG (RTG) soft key to set the transmit/receive transition gap between the last
sample of the downlink burst and the first sample of the subsequent uplink burst.
d
Enter a value by using the numeric keys, and then press the Enter soft key.
e
Press the CP Ratio soft key, and then select the cyclic prefix ratio option: 1/4, 1/8, 1/16, or
1/32.
f
Press the DL Symbols soft key to set the number of downlink symbols.
g
Enter a value by using the numeric keys, and then press the Enter soft key.
h
Press the UL Symbols soft key to set the number of uplink symbols.
i
Enter a value by using the numeric keys, and then press the Enter soft key.
3
To set the start/stop symbols, complete the following steps:
a
Press the Start/Stop Symbol soft key.
b
Enter a value by using the numeric keys, and then press the Enter soft key.
4
Toggle the Preamble Index soft key and select the preamble search method: Auto or Manual.
5
Toggle the Search Type soft key and select Full or Window.
6
Optional. Press the Miscellaneous soft key, and then do the following as needed:
–
To select the detect mode, press the Detect Mode soft key and then select the option:
Auto, QPSK, 16 QAM, or 64 QAM.
–
To select the downlink zone, press the DL Zone soft key and then select the permutation
zone option: Auto, PUSC for partial usage of subcarrier channels, FUSC for full usage of
subcarrier channels, or AMC2X3 for adaptive modulation and coding.
NOTE
The permutation zone, which is a number of contiguous OFDMA, symbols in downlink
that use the same permutation. The DL subframe may contain more than one
permutation zone. The maximum number of DL zone is 8 in one DL subframe.
7 MHz (8/7): Sets the channel bandwidth to 7 MHz with sampling factor 8/7. In
conjunction with nominal channel bandwidth
8.75 MHz (8/7): Sets the channel bandwidth to 8.75 MHz with sampling factor 8/7
10 MHz (28/25): Sets the channel bandwidth to 10 MHz with sampling factor 28/25
JD700B Series User's Guide
Chapter 13 Using Mobile WiMAX Signal Analyzer
433
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