Tektronix NetTek YBT250, Руководство пользователя

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Appendix A: Specifications
A- 8
YBT250 Field Transmitter & Interference Tester User Manual
Table A- 2: Measurement characteristics (Cont.)
Measurement Description
1xEV-DO Waveform Quality
(Rho Pilot, Rho MAC, Rho
Data) Rho (
ρ
) for 1xEV-DO signals provides an indication of
the signal to distortion ratio for the transmitted signal.
This quality measure is an indication of how similar the
transmitted signal is to a perfect signal. Rho can vary
between 0.0 and 1.0, where 1.0 represents a perfect
signal
Rho Pilot is only computed on chips in the Pilot intervals.
Pilot Rho is measured on the pilot interval of 20 half
slots.
Rho MAC is only computed on chips in the MAC interval.
Rho MAC is measured on the MAC interval of 20 half
slots.
Rho Data is only computed on chips in the Data interval.
Rho Data is measured on the Data interval of 20 half
slots.
Units None
Resolution 0.0001
Accuracy, pilot only
±
0.005, 0.9
≤ ρ ≤
1.0
Usable range 0.5
≤ ρ ≤
1.0
Degradation due to adjacent channel CDMA carriers
(having equivalent power): add
±
0.015.
Estimated Waveform Quality Measures waveform quality as defined by IS-97-D using
any CDMA signal.
Units None
Resolution 0.0001
Accuracy
±
0.01 for rho
≥
0.9, typical
Reference Information:
The Rho measurement as given in IS-97-D is only
specified for a “pilot-only” CDMA signal. This measure-
ment makes an estimate of the Rho value on any CDMA
signal.