Atec Agilent-E4406A - Manual (Page 15)

15
EDGE/GSM (Option E4406A-202)
3
π
/8 8PSK Modulation
GSM (Option E4406A-BAH)
GSMK Modulation
Power versus time measurement
Power versus time measures the average power during the
“useful part” of the EDGE or GSM burst and verifies that
the power ramp is within the EDGE or GSM mask. The
specified EDGE or GSM masks for both base transceiver
stations and mobile stations are provided. Power versus
time also lets you view the rise, fall, and “useful part” of
the burst. The timings are referenced to the transmitter
from bit 13 to 14 of the training sequence (midamble).
Power vs. time and EDGE power vs. time
GMSK modulation (GSM)
3
π
/8 shifted 8PSK modulation (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 –30 dBm (nominal)
at RF input for GSM
and EDGE
Absolute power accuracy for in-band signal
(excluding mismatch error)
18 to 30 °C; –0.11 ± 0.60 dB
(–0.11 ± 0.40 dB, typical)
0 to 55 °C; –0.11 ± 0.90 dB
Power ramp relative Referenced to mean
accuracy transmitted power
RF input range = Auto ±0.26 dB
+6 dB to noise
Mixer level
≤
-12 dBm ±0.26 dB
+6 dB to noise
Measurement floor –81 dBm + input attenuation
(nominal)
Time resolution 200 ns
Burst to mask uncertainty ±0.2 bit (approx ±0.7 µs)
EDGE EVM measurement
The EDGE EVM measurement measures the modulation
quality of the 3
π
/8 8PSK modulated signal providing you
with IQ constellation diagram, error vector magnitude
(EVM) in RMS and peak, 95 percentile, and I/Q origin offset.
EDGE (EVM) 3
π
/8 shifted 8PSK modulation
Error Vector Magnitude Specifications based on 3GPP
essential conformance
requirements, and are based on
200 bursts
Carrier power range –45 dBm (nominal)
at RF input
EVM
Range 0 to 25% (nominal)
Floor (RMS) 0.5%, (0.3%, typical)
Accuracy (RMS) ±0.5% (Power range at
RF input from +27 to –12 dBm,
EVM range 1% to 11%)
Frequency error ±1 Hz + (transmitter frequency
x frequency reference accuracy)
I/Q origin offset range –20 to –45 dBc
Output RF spectrum measurement
The output RF spectrum measurements determine the
spectral energy emitted into the adjacent channels. The
measurements are divided into two types: spectrum due to
3
π
/8 8PSK or GMSK modulation and noise, and spectrum
due to switching transients (burst ramping). A single offset
can be examined with a corresponding trace, or up to 15
offsets can be measured with a tabular data display.
Minimum carrier power -15 dBm (nominal)
at RF input
ORFS relative RF power uncertainty
Due to modulation
Offsets
≤
1.2 MHz ±0.26 dB
Offsets
≥
1.8 MHz ±0.36 dB
Due to switching ±0.27 dB (nominal)
ORFS absolute RF power ±0.60 dB (±0.40 dB, typical)
accuracy 20 to 30 °C
Dynamic range 5-pole sync-tuned filters
Spectrum due Methods: direct time and FFT
to modulation
Offset frequency GSM EDGE
100 kHz 67.7 dB 67.7 dB
200 kHz 73.3 dB 73.3 dB
250 kHz 76.3 dB 76.3 dB
400 kHz 78.4 dB 77.9 dB
600 kHz 81.1 dB 80.2 dB
1.2 MHz 85.0 dB 83.3 dB
1.8 MHz 90.3 dB 82.4 dB
6.0 MHz 94.0 dB 85.3 dB
Spectrum due to switching
Offset frequency
400 kHz 68.7 dB (100%) 71.2 dB (95%)
600 kHz 71.0 dB (100%) 73.1 dB (95%)
1.2 MHz 74.1 dB (100%) 77.0 dB (95%)
1.8 MHz 78.4 dB (100%) 80.4 dB (95%)