Time Reference (TD-SCDMA)
DwPTS (See TD-SCDMA Standard Setups/Presets Table.)
Time Reference specifies the time reference used to compute the Overall Error Summary - Timing Error data results (see Overall Timing Error):
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DwPTS (Downlink Pilot: |
Overall Timing Error uses the Downlink Pilot Timeslot as the time reference |
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UpPTS (Uplink Pilot): |
Overall Timing Error uses the Uplink Pilot Timeslot as the time reference |
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Trigger Point: |
Overall Timing Error uses a trigger event as the time reference. The Trigger Point is taken to be the start of a sub-frame. |
When making triggered measurements, the demodulation algorithm requires some amount of data prior to the beginning of the desired sub-frame, in order for demodulation to begin on that sub-frame. This is handled internally but if there are delay differences between the sub-frame boundary in the incoming signal and the trigger then the may need to be adjusted in order to supply enough data before the beginning of the sub-frame. For instance, if an external trigger occurs 20 us after the beginning of the desired sub-frame then would need to be set to -20 us.
See Also
Result Length, Start Boundary and Analysis Parameters
