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S:\Hp8960\E1962B CDMA 2000\Pi Release\Reference Guide\Chapters\cdma2000_meas_hwq_desc.fm
Handoff Waveform Quality Measurement Description
Handoff Waveform Quality Measurement Description
How is a Handoff Waveform Quality measurement made?
Handoff waveform quality measurements test a transmitters modulation accuracy during a hard handoff. The
handoff is implemented as a change in pn (pseudo-noise) offset.
Each handoff waveform waveform quality measurement returns a number of measurements which include
rho, the percentage of signal energy that correlates with a perfect IS-2000 signal after time offset and
frequency error have been removed.
This measurement is designed to analyze signals that are made up of multiple code channels, as in the case of
radio configurations three and above.
Waveform quality measurements are made by sampling the down-converted input signal, then applying DSP
(Digital Signal Processing) techniques to determine the original data input to the mobile station transmitter’s
Walsh spreading function for each channel. The DSP then generates a representation of what the “ideal”
signal would be given the coding and data in use at the time of transmission. The ideal waveform is then
compared with the waveform being measured to determine the waveform quality.
Table 5. lists the Handoff Waveform Quality measurements:
Measurement Behavior
The handoff waveform quality measurement does not provide the Multi-Measurement Count feature in the
setup menu.
Handoff waveform quality measurements are always triggered singly (press the START SINGLE key to
initiate a measurement from the front panel).
Table 5. Handoff Waveform Quality measurement results
Handoff Waveform Quality
Rho
Frequency Error
Timing Error
Carrier Feedthrough
Phase Error
Magnitude Error
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