Chapter 13
Using Mobile WiMAX Signal
Analyzer
484
JD700B Series User’s Guide
Spectral flatness
The Spectral Flatness is used to measure the flatness energy of the constellation according to the WiMAX
specification IEEE 802.16e.
Setting measure setup
After configuring test parameters as described in the “Configuring test parameters” on page 468, 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:
Press the
Bandwidth
soft key, and then select the nominal channel bandwidth to be
measured from the following choices:
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
Toggle the
Frame Length
soft key and select
5 ms
or
10 ms
.
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.
Enter a value by using the numeric keys, and then press the
Enter
soft key.
Press the
CP Ratio
soft key, and then select the cyclic prefix ratio option:
1/4
,
1/8
,
1/16
, or
1/32
.
Press the
DL Symbols
soft key to set the number of downlink symbols.
Enter a value by using the numeric keys, and then press the
Enter
soft key.
Press the
UL Symbols
soft key to set the number of uplink symbols.
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:
Press the
Start Symbol
soft key.
Enter a value by using the numeric keys, and then press the
Enter
soft key.
Press the
Stop Symbol
soft key.
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.
To set the delay, complete the following steps:
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.
Содержание CellAdvisor JD700B Series
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