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Chapter 10 137
GSM/EDGE Measurement Application
Measurements
e. The accuracy specification applies when the Burst Sync is set to Training Sequence, and Trigger is set
to External Trigger.
Description Specifications Supplemental Information
Power vs. Time
and
EDGE Power vs. Time
GMSK modulation (GSM)
3π/8 shifted 8PSK modulation, 3π/4 shifted
QPSK, π/4 shifted 16QAM, –π/4 shifted
32QAM modulation in NSR/HSR (EDGE)
Measures mean transmitted RF carrier power
during the useful part of the burst (GSM
method) and the power vs. time ramping. 510
kHz RBW
Minimum carrier power at RF Input for
GSM and EDGE
−35 dBm (nominal)
Absolute power accuracy for in-band
signal (excluding mismatch error)
a
a. The power versus time measurement uses a resolution bandwidth of about 510 kHz. This is not wide
enough to pass all the transmitter power unattenuated, leading the consistent error shown in addition to
the uncertainty. A wider RBW would allow smaller errors in the carrier measurement, but would allow
more noise to reduce the dynamic range of the low-level measurements. The measurement floor will
change by 10 × log(RBW/510 kHz). The average amplitude error will be about −0.11 dB ×
((510 kHz/RBW)
2
). Therefore, the consistent part of the amplitude error can be eliminated by using a
wider RBW.
−0.11 ±0.27 dB (95th percentile)
Power Ramp Relative Accuracy Referenced to mean transmitted power
Accuracy ±0.16 dB
Measurement floor −87 dBm