E1968A Datasheet, PDF (12/22 Pages) Keysight Technologies – GSM/GPRS/EGPRS Test Application

12 | Keysight | E1968A GSM/GPRS/EGPRS Test Application - Technical Overview
8PSK/16QAM multislot-tolerant modulation
accuracy measurement
All specifications for the 8PSK/16QAM multislot-tolerant modulation accu-
racy measurement are valid for the frequency ranges 700 to 800 MHz, 810
to 960 MHz, and 1.7 to 1.99 GHz.
Types of signals
measured
Normal 8PSK/16QAM bursts
Multislot input signal
conditions
≤ 30 dB difference in power level between
adjacent timeslots
Multislot signal
Measurement of one user-specified timeslot
measurement capability transmitted as a single timeslot or four adjacent
timeslots
Frequency capture range Signal must be within ± 200 Hz of test set’s
expected frequency for warranted performance
Minimum input level
Signal at test set’s RF IN/OUT must have
8PSK/16QAM burst power ≥ –15 dBm for
warranted performance
Residual rms EVM
< 1 percent for 8PSK
< 1 percent for 8PSK difference ≤ 30 dB
rms EVM measurement
accuracy
Sample EVM
measurement accuracy
< 0.5 or > –1.0 for 8PSK
< 1.5 or > 2.0 for 16QAM for measured average
rms EVM between 1 and 10 percent
< ± 4 percent
Frequency error
< ± 10 Hz plus timebase accuracy
measurement accuracy
Origin offset suppression < ± 1.5 dB for measured origin offset
measurement accuracy suppression between 25 and 40 dB
for 8PSK
Trigger sources
RF rise, protocol, immediate, auto, external
Trigger delay
Settable between ± 2.31 ms
Burst synchronization Midamble
Displayed graphical
results
EVM versus symbol, demodulated symbols
in octal and binary, magnitude error versus
symbol, phase error versus symbol, sample
EVM histogram with plots of measured sample
EVM PDF, expected sample EVM PDF, 95th
percentile EVM, and probability with settable
markers and variable axes
Multi-measurement
capabilities
1 to 999 bursts; maximum, minimum, and
average results
Concurrency capabilities 8PSK multislot-tolerant modulation accuracy
measurements can be made concurrently with
all other measurements
Supplemental characteristics
Measurement resolution 0.01 percent
Frequency error
0.01 Hz
measurement resolution
Origin offset suppression 0.01 dB
measurement resolution
Amplitude droop
0.01 dB
measurement resolution
Magnitude error
0.01 percent
measurement resolution
Phase error
0.01 degree
measurement resolution
IQ imbalance
0.01 dB
measurement resolution
Probability measurement 0.01 percent
resolution
GSM/GPRS/EGPRS multislot transmit power
measurement
The following specifications are valid when the burst capture range is set
to Single:
Types of signals
measured
Normal GMSK bursts sent as GSM or GPRS signals,
CW, RACH bursts for a single uplink timeslot only
Multislot input signal ≤ 30 dB difference in power level between
conditions
adjacent timeslots
Multislot signal
measurement
capability
Measurement of one user-specified timeslot
transmitted as a single timeslot or two adjacent
timeslots
Frequency capture Signal must be within ± 100 kHz of test set’s ex-
range
pected frequency for warranted performance
Minimum input level Signal at test set’s RF IN/OUT must have transmit
power ≥ –25 dBm for warranted performance
Measurement accuracy at RF IN/OUT port between
+20 and +55 °C
Accuracy (dBm)
< ± 0.27
< ± 0.29
< ± 0.52
< ± 0.54
Frequency (MHz)
810 to 960
450 to 496
700 to 800
1700 to 1990
810 to 960
450 to 496
700 to 800
1700 to 1990
Timeslot
Single slot and multis-
lot at the same level
Multislot at different
levels
Measurement accuracy when RF OUT ONLY port is selected for
signal generation (in addition to measurement accuracy at
RF IN/OUT port):
Accuracy (dBm)
Frequency (MHz)
< ± 0.27
< ± 0.29
450 to 496
700 to 800
810 to 960
< ± 0.52
< ± 0.54
1700 to 1990
VSWR at RF IN/OUT
Trigger sources
Trigger delay
< 1.14 : 1 for 450 to 496 MHz and 700 to
960 MHz, < 1.2 : 1 for 1.7 to 1.99 GHz
RF rise, protocol, immediate, auto, external
Settable between ± 2.31 ms
Figure 2. EGPRS modulation accuracy measurement includes a
graphical sample EVM histogram to observe your device’s
statistical EGPRS performance.