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1xEV-DO Measurements
R&S
®
CMW-KM8xx/-KS8xx
258
User Manual 1173.9511.02 ─ 12
●
Phase Error
: phase difference (RMS and peak) of the I/Q components of the sig-
nal received from the access terminal and an ideal reference signal at the detection
points
●
Carrier Feedthrough
: refers to the I/Q origin offset, which is the magnitude of the
RF carrier relative to the magnitude of the modulated carrier
●
I/Q Imbalance
: the amplitude ratio between the I and Q components of the signal
●
Carrier Frequency Error
: the difference between the nominal frequency of the
selected channel and the measured frequency
●
Transmit Time Error
: the time offset between the AT signal and the trigger event
coupled with the forward signal
If the 1x-EV-DO signaling application is used in parallel, select the super frame trig-
ger provided by the signaling application.
●
Waveform Quality
: the ratio of the correlated power to the total power. Addition-
ally, the waveform quality at the maximum/minimum power since the start of the
measurement is displayed.
●
AT Power
: transmitter output power of the access terminal. The filter bandwidth
used for the measurement is indicated in brackets. The "Wideband" bandwidth
equals 8 MHz or 16 MHz, see
Multi Evaluation: Carrier Configuration
See also: "Modulation Accuracy" in the R&S
CMW user manual, chapter "System
Overview"
For additional screen elements refer to
.
For query of the results via remote control, see
chapter 3.3.11, "Multi Evaluation Mea-
3.2.9 OLTR Measurement
The Open Loop Time Response (OLTR) application measures the AT's TX power
response to decreases and increases of the total base station power.
OLTR is a single carrier measurement.
3.2.9.1
General Measurement Procedure
A single OLTR measurement comprises 1 to 5 measurement sequences, each
addressing a pair of oppositely directed power steps. The step direction is configurable
and defines the direction of the first BS power step. With each additional and consecu-
tive measurement sequence the step direction is toggled, e.g. 2 measurement sequen-
ces with an initial power DOWN step result in an overall step sequence DOWN-UP-
DOWN-UP.
The OLTR measurement can be used with any application that is able to control the
forward link power and to provide a trigger signal to the measurement application indi-
cating the power steps. E.g. it is possible to use the GPRF generator with an ARB file
containing suitable power steps, decorated with a particular marker type, serving as
trigger source for the measurement application.
In general the OLTR measurement proceeds as depicted in the following figure:
General Description
深圳德标仪器