Anritsu Spectrum Master MS2720T, Руководство пользователя

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CDMA Signal Analyzer 2-8 CDMA Measurement Descriptions
3GPP2 MG PN: 10580-00235 Rev. D 2-17
CDP Table
This function displays a table view of the channels with channel code number, status, power
(dB and dBm), and whether multiple codes are used. Overall code utilization is displayed as a
percent at the bottom of the measurement screen.
Modulation Summary
This function displays a table view of the values of Pilot Power, Channel Power, Freq error,
Freq error PPM, Carrier Freq, Rho, Noise floor, RMA Phase Err (deg), and Tau.
OTA Measurements
Pilot Scan
The strongest nine received PNs are displayed as bar graphs, and the PN numbers are
displayed at the bottom of the bar graphs.
For each PN, a table displays PN number, Ec/Io, and Tau. Also shown are Pilot Power,
Channel Power, and Pilot Dominance.
Pilot Power: Pilot power is the total power in the pilot channel. This is normally a
constant for a base station. When the instrument is connected to the base station, if the
measured power is unexpected, then check that the entered power offset is correct and
that the connections are tight. Unexpected readings may indicate an incorrect power
setting at the base station. For Over-The-Air (OTA) measurements, the pilot power will
vary as the signal path from the transmitter to receiver varies.
Channel Power: Channel power is the total power that is broadcast in the specified
CDMA channel.
Pilot Dominance: Pilot Dominance is a measure of the strength of the strongest pilot
compared to the next strongest pilot in the same channel. This should be >10 dB to
make good demodulator measurements.
Multipath
The length of the bar represents the relative strength in the path. Six paths are displayed.
For each path, a table below the bar graph displays Ec/Io and Tau. Also shown are Channel
Power and Multipath Power.
Multipath Power: Multipath Power is a measure of the total power in the dominant signal
(spread in time due to multipath echoes) relative to its power in the main transmission path.
This value should be < 0.4 dB to make good measurements.
Ec/Io
Ec/Io is the pilot power compared to the total channel power.
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