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Chapter 4 85
CDMA Measurements - Screens and Control Fields
Rho Measurements Rho Measurements
Frequency Error
Frequency error is displayed when the Rho measurement is selected.
Frequency error is the difference between the base station’s transmitter
frequency and the frequency you enter in the Tune Freq field.
Screens on which this measurement is displayed.
• CDMA ANALYZER
• CDMA GENERATOR
Time Offset
Time offset is displayed when the Rho measurement is selected. Time
offset is the time difference between the base station’s even second and
the start of the short sequence. It indicates how well your transmitter’s
signal is time-aligned to system time. Time offset is measured at the
base station’s antenna. The displayed value is based on the value
entered in the PN Offset field. (See the PN Offset field description, on
page 106.)
In Figure 4-2 on page 86 the first example is a measurement with a
time offset of zero. The beginning of the received data block aligns with
the first pilot PN chip of the reference signal. Zero time offset indicates
that the trigger event to the CDMA Analyzer coincided with the arrival
of the base station signal’s first pilot PN chip.
When the base station’s signal is delayed relative to the trigger event,
time offset will be a positive value. The second example is a
measurement with a positive time offset. The beginning of the data
block will align with a portion of the reference signal toward the end of
a pilot PN sequence. This indicates that the trigger event to the CDMA
Analyzer occurred when the base station was still transmitting a pilot
PN sequence prior to the first pilot PN chip of the expected sequence.
When the base station’s signal is early relative to the trigger event,
time offset will be a negative value. The third example is a
measurement with a negative time offset. The beginning of the data
block will align with a portion of the reference signal after the first pilot
PN chip. This indicates that the trigger event to the CDMA Analyzer
occurred after arrival of the base station signal’s first pilot PN chip.
Screens on which this measurement is displayed.
• CDMA ANALYZER
• CDMA GENERATOR
• CODE DOM (Code Domain Analyzer)
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