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Chapter 13 163
cdma2000 Measurement Application
Measurements
Description Specifications Supplemental Information
Adjacent Channel Power
a
a. ACP test items compliance the limits of conducted spurious emission specification defined in 3GPP2
standards
Minimum power at RF input −36 dBm (nominal)
Dynamic range Referenced to average power of carrier in
1.23 MHz bandwidth
Offset Freq. Integ. BW
750 kHz 30 kHz −73.6 dBc −81.0 dBc (typical)
1980 kHz 30 kHz −78.3 dBc −83.9 dBc (typical)
ACPR Relative Accuracy
RBW method
b
b. The RBW method measures the power in the adjacent channels within the defined resolution band-
width. The noise bandwidth of the RBW filter is nominally 1.055 times the 3.01 dB bandwidth. There-
fore, the RBW method will nominally read 0.23 dB higher adjacent channel power than would a
measurement using the integration bandwidth method, because the noise bandwidth of the integration
bandwidth measurement is equal to that integration bandwidth. For cdma2000 ACP measurements
using the RBW method, the main channel is measured in a 3 MHz RBW, which does not respond to all
the power in the carrier. Therefore, the carrier power is compensated by the expected under-response of
the filter to a full width signal, of 0.15 dB. But the adjacent channel power is not compensated for the
noise bandwidth effect.
The reason the adjacent channel is not compensated is subtle. The RBW method of measuring ACP is
very similar to the preferred method of making measurements for compliance with FCC requirements,
the source of the specifications for the cdma2000 Spur Close specifications. ACP is a spot measure-
ment of Spur Close, and thus is best done with the RBW method, even though the results will disagree
by 0.23 dB from the measurement made with a rectangular pass band.
Offsets < 750 kHz
Offsets > 1.98 MHz
±0.11 dB
±0.12 dB
Absolute Accuracy ±1.05 dB ±0.34 dB (at 95% confidence)
Sensitivity −94.7 dBm −100.7 dBm (typical)
Description Specification Supplemental Information
Power Statistics CCDF
Histogram Resolution
a
0.01 dB