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Conducting power vs. time measurements
The Power vs. Time (P vs T) measurement analyzes the amplitude profile and timing of the burst
signal and provides a time mask for the signal. It measures the mean transmit power during the "useful
part" of TD-SCDMA bursts and verifies that the power ramp fits within the defined mask. TD-SCDMA is
a Time Division Multiple Access (TDMA) scheme with seven time slots, or bursts, per RF channel and
by using the "Multi-Slot" function, up to seven slots in a frame can be viewed at one time.
Power vs. time (slot)
The Power vs. Time (Slot) in TD-SCDMA Signal Analyzer measures the modulation envelope in the
time domain, showing the signal rise and fall shape of TD-SCDMA signal.
Setting measure setup
After configuring test parameters as described in the "Configuring test parameters" on page 375, 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 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.
JD700B Series User's Guide
Chapter 12 Using TD-SCDMA Signal Analyzer
389
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