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JD780A Series Analyzers
436
Using TD-SCDMA Signal Analyzer
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 415, 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.
Toggle the
Scramble
soft key and select
Auto
or
Manual
to set the scramble code automatically
or manually.
3.
Press the
Slot Number
soft key, and then select the time slot number to be displayed:
TS0
,
TS1
,
TS2
,
TS3
,
TS4
,
TS5
, or
TS6
.
4.
Press the
Spread Factor
soft key, and then select the spread factor option:
DL Auto
for auto
detection of downlink,
UL Auto
for auto detection of uplink,
SF1
,
SF2
,
SF4
,
SF8
, or
SF16
5.
To set the number of maximum users, complete the following steps:
a.
Press the
Max Users
soft key.
b.
Enter a value up to 16 by using the numeric keys, and then press the
Enter
soft key.
6.
Optional
. Press the
Miscellaneous
soft key, and then do the following(s) as needed:
–
To set the delay, complete the following steps:
a.
Press the
Delay
soft key to set the amount of delay in µs.
b.
Enter a value by using the numeric keys. You can also use the rotary knob.
c.
Press the
µs
soft key.
NOTE
The Delay setting is used only when there is a time offset in the signals to be measured.
–
To select how to determine scrambling estimation, toggle the
Scramble
soft key and select
Spec
or
Full
.
NOTE
The Spec searches
“Sync Sequence Number” from 0 to 31 based on the TD-SCDMA
specification and determines
“Scrambling Code Number” by using the sync sequence
number, while the Full does from 0 to 127 fully.
–
To select how to determine the Midamble spread factor estimation either in full or maximum
power search, toggle the
Mid SF Map
soft key and select
Max
or
Spec
.
NOTE
The Max determines the spread factor of the Midamble by using the maximum power of
the received Midamble, while the Spec searches
“Default Midamble Allocation” based on
the TD-SCDMA specification.
–
To select the detect mode, press the
Detect Mode
soft key and then select the option:
Auto
,
QPSK/8PSK
,
QPSK
,
8PSK
,
16 QAM
, or
64 QAM
.
–
To set the relative threshold, complete the following steps:
a.
Press the
Threshold
soft key. Its default setting is -27 dB.
b.
Enter a value between -50 and zero by using the numeric keys.
Содержание CellAdvisor JD780A Series
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Страница 590: ...JD780A Series Analyzers 590 Appendix Figure 306 Append keywords window...