JDS Uniphase CellAdvisor JD780A Series, User Manual

Page: 431 / 592

JD780A Series Analyzers
Using TD-SCDMA Signal Analyzer
431
Power vs. time (frame)
The Power vs. Time (Frame) measures the modulation envelope in the time domain, showing the
power of each time slot of the TD-SCDMA signal.
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.
Procedure
1.
Press the MEASURE SETUP hot key.
2.
Press the Slot Number soft key, and then select the time slot number to be displayed: TS0 , TS1 ,
TS2 , TS3 , TS4 , TS5 , or TS6 .
3.
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
4.
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.
c. Press the Enter soft key.
5.
Optional . 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.
6.
Optional . Press the Miscellaneous soft key, and then do the following(s) as needed:
–
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 .