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S:\Hp8960\E1960A GSM Mobile Test Application\A.04 Release\Reference_Manual\Chapters\meas_pfer_desc.fm
Phase and Frequency Error Measurement Description
Phase and Frequency Error Measurement Description
How is a phase and frequency error (PFER) measurement made?
The PFER measurement performs a narrow-band (<200 kHz) measurement of the modulation quality and
frequency accuracy of the GSM mobile station’s transmitter. The test set measures frequency error, rms phase
error and peak phase error over the useful part of the burst.
The PFER measurement demodulates the data and compares the measured wave form with the “ideal”
waveform that was expected for the data received. The frequency error is the difference in frequency, after
adjustment for the effect of the modulation and phase error, between the RF transmission from the mobile
station and the test set. The phase error is the difference in phase, after adjustment for the effect of the
frequency error, between the mobile station and the theoretical “ideal” transmission. This measurement
conforms to the ETSI 05.05 and 11.10 standards.
The PFER measurement is controlled by the DSP in the test set. No calibration is required by the user, the
DSP gets calibration information during test set power up. PFER measurements can be initiated with any
measurement made by the test set.
Single or Multi-Measurements
The DSP demodulates the data and compares the measured waveform with the “ideal” waveform created by
the DSP.
A single burst for a PFER measurement calculates the following:
• peak phase error
• rms phase error
• frequency error
A multiple burst PFER measurement is made when the multi-measurement state is on and calculates the
maximum, minimum and average values for the following:
• peak phase error
• rms phase error
• frequency error
• worst frequency error (worst frequency error is the frequency furthest from zero.)
All of these results are available to the user with the FETCh command. If the most positive and the most
negative frequency error are the same value, the most positive frequency will be returned. Worst frequency
error is only accessible through GPIB. The test set always has integrity indicator available to the user
regardless of single or multiple burst measurements.
Summary of Contents for 8960 Series 10
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