E1968A Datasheet, PDF (9/22 Pages) Keysight Technologies – GSM/GPRS/EGPRS Test Application

09 | Keysight | E1968A GSM/GPRS/EGPRS Test Application - Technical Overview
Receiver measurement specifications
Simultaneous demodulation and measurements
The test set’s RF analyzer provides dedicated signal paths for
demodulation (maintaining the link) and measurements to be
performed simultaneously.
Demodulation frequency Signal must be within ± 100 kHz of test set’s
capture range
expected frequency for warranted performance
Single-slot demodula- ≥ –30 dBm for BER and BLER measurements
tion sensitivity
Multislot demodulation All uplink timeslots ≥ –30 dBm for maintaining a
sensitivity
data link when
–– Adjacent GMSK timeslots from GPRS
signals are ≤ 25 dB different in level
–– Adjacent GMSK timeslots from EGPRS
signals are ≤ 20 dB different in level, or
–– Adjacent 8PSK timeslots are ≤ 10 dB
different in level
Supplemental characteristics
Typical demodulation
sensitivity
≥ –40 dBm for maintaining a link
GSM BER measurement
Types of signals
measured
Compares 260 bits of speech data using mobile
phone loopback with or without signaling of
erased speech frames
Minimum input level
Uplink signals at test set’s RF IN/OUT must
have transmit power ≥ –30 dBm for warranted
performance
Residual BER
< 10^-6
Mobile loopback
In active cell operating modes as type A or type
B must be selected
Measurement type
Selected as residual type Ia, residual type Ib,
residual type II, type Ia, type Ib, or type II
Signaling loopback
control
Selectable as on or off
Data patterns
Selectable in GSM+TCH operating mode as all
zeros, all ones, alternate bits, alternate pairs,
alternate quads, PRBS-9, PRBS-15, fixed 2B
(hex), multi-tone, or custom
Closed-loop signaling Settable between 0 and 5 s
delay:
Speech frames delay
Settable between 1 and 15 frames or automati-
cally determined
Measurement unit
Selectable as percent or count
Numerical results
BER, number of bits tested, number of bad
bits, frame erasure (FER) for residual measure-
ment types, cyclic redundancy check (CRC)
for non-residual measurement types, speech
frame delay, Rx level, Rx quality
Multi-measurement
capabilities
1 to 999,000 bits
Concurrency capabilities GSM BER measurements cannot be made con-
currently with GSM FBER measurements, GSM
decoded audio level measurements, or while
speech is provided on the downlink TCH; GSM
BER measurements can be made concurrently
with all other measurements
Supplemental characteristics
Measurement resolution 0.01 percent
GSM fast bit error ratio (FBER) measurement
Types of signals
measured
Minimum input level
Residual BER
Comparison of 114 bits of interleaved data with
mobile phone in burst-by-burst loopback
Uplink signal at test set’s RF IN/OUT must
have transmit power ≥ –30 dBm for warranted
performance
< 10^-6
Measurement data
pattern
PRBS-9, PRBS-15
Mobile loopback
In active cell operating mode type C must be
selected
TDMA frame delay
Settable between 0 and 26 frames or
automatically determined
Signaling loopback
control
On or off
Closed-loop signaling
delay
Measurement unit
Numerical results
Settable between 0 and 5 s
Selectable as percent or count
Number of bits tested, FBER, number of bad
bits, TDMA frame delay, Rx level, Rx quality
Multi-measurement
capabilities
1 to 999,000 bits
Concurrency
capabilities
GSM FBER measurements cannot be made
concurrently with GSM BER measurement,
GSM decoded audio level measurements, or
while speech is provided on the downlink TCH;
GSM FBER measurements can be made con-
currently with all other measurements
Supplemental characteristics
Measurement resolution 0.01 percent