Chapter 3 53
Making EDGE (with GSM) Measurements
Preparing for Measurements
Burst Sync
Pressing the
Burst Sync key allows you to choose the source used to
synchronize the measurement to the “T0” point of the GSM burst. The
“T0” point is defined as the time point of the transition from bit 13 to bit
14 of the midamble training sequence for a given time slot. The
Burst Search Threshold setting (in the Mode Setup keys under Trigger)
applies to both
Training Seq and RF Amptd. It is described on page 22.
Pressing the
Burst Sync key will bring up a menu with some or all of the
following choices:
•
Training Seq - Synchronizes the measurement to the timing of the
demodulated training sequence in the GSM burst. This is the most
precise method, but requires a GSM burst with a valid TSC
(Training Sequence Code). The “T0” point is determined by
demodulation of the burst and successful identification of the TSC.
“T0” is then found to within 1/10 bit.
•
RF Amptd - Synchronizes the measurement to the burst transition of
the measured RF carrier. “T0” is set to the 50% point between the
start and end of the burst.
•
None - Use the start of the time record as the start of the useful part.
“T0” is set to the middle of the useful part.
• Ext - Use the external trigger plus delay as the start of the useful
part. “T0” is set to the middle of the useful part.
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