Anritsu 3GPP, Руководство по измерениям

Страница: 83 / 244

TD-SCDMA/HSPA+ Signal Analyzer 4-4 TD-SCDMA/HSPA+ Demodulator
3GPP MG PN: 10580-00234 Rev. Y 4-7
4-4 TD-SCDMA/HSPA+ Demodulator
The following parameters are measured in the Demodulator option.
Slot Power
The power measured in the selected slot, excluding the gap. If Slot Selection is set to Auto,
then the instrument searches for an active downlink slot and uses the detected slot number
for measuring slot power.
DwPTS Pwr
The power in the Downlink Pilot slot, excluding the gap.
Noise Floor
Noise floor is the average of inactive codes powers (dB) from the code domain power (CDP).
Freq Error
Frequency error is the difference between the received center frequency and the specified
center frequency. This value is linked to the external frequency reference accuracy and is
typically useful only with a good external frequency reference or GPS reference.
Tau
Tau is the timing delay of the frame starting point in reference to the occurrence of a trigger.
When no trigger is used, Tau values are relative to the most dominant SYNC-DL code.
Figure 4-4. TD-SCDMA/HSPA+ Demodulator, CDP Data