JD780A Series Analyzers
472
Using Mobile WiMAX Signal Analyzer
Conducting modulation measurements
Constellation
The Constellation is used to observe some aspects of modulation accuracy and can reveal certain
fault mechanisms such as I/Q amplitude imbalance or quadrature imbalance. It displays constellation
diagram by modulation types.
Setting measure setup
After configuring test parameters as described in the
“Configuring test parameters” on page 456, 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:
–
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
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.
Summary of Contents for CellAdvisor JD780A Series
Page 52: ...JD780A Series Analyzers 52 Getting Started Figure 6 Example of Web remote on Chrome...
Page 254: ...JD780A Series Analyzers 254 Using LTE FDD Signal Analyzer 3 RS SINR 4 S SS RSSI 5 P SS Power...
Page 323: ...JD780A Series Analyzers Using LTE TDD Signal Analyzer 323 3 RS SINR 4 S SS RSSI 5 P SS Power...
Page 390: ...JD780A Series Analyzers 390 Using EV DO Signal Analyzer 3 Pilot 4 MAC 64 5 MAC 128...
Page 525: ......
Page 590: ...JD780A Series Analyzers 590 Appendix Figure 306 Append keywords window...
