Technical data

Chapter 3 107
1xEV-DO Analyzer and Over Air Test
Metrics Provided by the 1xEV-DO Tx and Over Air Analyzer
Measurement
1xEV-DO Analyzer and Over Air
Test
MAC Rho is the measure of the modulation quality for a 1xEV-DO transmitter. This
measurement is analogous to measuring FM accuracy and distortion in an AMPS
network or EVM in a TDMA system. A Rho value of 1.0 represents a perfect signal,
indicating that all of the power is being transmitted correctly. MAC Rho is only
measured over the 128 MAC chips contained within every half-slot. The
measurement result is blanked out when the code domain measurement does not
synchronize to the received input signal. The number of slots over which the
acquisition is made is determined by the Capture Interval, which itself is determined
by the Meas Time setting.
Max Inactive Ch
This is a measure of the Maximum Inactive Channel Power. The reported result is
the maximum power in the separate I and Q channels when the MAC Channel
Walsh Codes are inactive, relative to the total power in both the active and the
inactive channels. The number of slots over which the acquisition is made is
determined by the Update Interval, which itself is determined by the Meas Time
setting.
The result reported is for the currently selected CDP type, for example, if the
selected CDP type is Pilot, this will report the highest power level detected across
the inactive channels within the 32 pilot codes.
Noise Floor
The Noise Floor is the average inactive Walsh code power level detected in the
combined I and Q channels, relative to the total power in both the active and the
inactive channels. The number of slots over which the acquisition is made is
determined by the Update Interval, which itself is determined by the Meas Time
setting.
The result reported is for the currently selected CDP type, for example, if the
selected CDP type is Pilot, this will report the average power level detected across
the inactive channels within the 32 pilot codes.
NOTE Take care that you do not confuse Noise Floor with Idle Data Power. Idle Data
Power is the power present in the data region of the Idle slots. Noise Floor is the
average power present in the inactive Walsh Code channels.
Data Modulation Type
The Data Channel Modulation measurement returns the highest modulation detected
within the measurement interval. There are three types of modulation, and hence
four possible measurement results: QPSK, 8PSK, and 16QAM, and blank when no