11 | Keysight | E1968A GSM/GPRS/EGPRS Test Application - Technical Overview

GMSK multislot-tolerant phase and frequency

error measurement

Types of signals

measured

Normal GSMK bursts from GPRS or EGPRS

signals, RACH bursts for a single uplink

timeslot only

Multislot input signal

conditions

≤ 30 dB difference in power level between

adjacent timeslots

Multislot signal

measurement capability

Measurement of one user-specified timeslot

transmitted as a single timeslot or four adjacent

timeslots

GPRS frequency capture

range

Signal must be within ± 100 kHz of test set’s

expected frequency for warranted performance

EGPRS frequency

capture range

Signal must be within ± 1 kHz of test set’s

expected frequency for warranted performance

Minimum input level

Signal at test set’s RF IN/OUT must have

transmit power ≥ –15 dBm for warranted

performance

Frequency error

measurement accuracy

< ± 12 Hz plus timebase accuracy for normal

bursts, < ± 18 Hz plus timebase accuracy for

RACH bursts

When using the RF generator as the RF refer-

ence frequency for the mobile, the RF generator

frequency error relative to the timebase refer-

ence must be added

rms phase error

measurement accuracy

< 1 degree

Peak phase error

measurement accuracy

< 4 degrees

Trigger sources

RF rise, protocol, immediate, auto, external

Trigger delay

Settable between ± 2.31 ms

Trigger qualification

On or off

Burst synchronization

Midamble, RF amplitude, none for a single up-

link timeslot; midamble for two uplink timeslots

and all EGPRS signals

Transmitter measurement specifications

Unless otherwise specified, transmitter measurements can be

performed in active cell (GSM), active cell (GPRS), and active cell

(EGPRS) operating modes.

GMSK multislot-tolerant phase and frequency

error measurement (continued)

Confidence level

Settable from 80 to 99.99 percent

Peak phase error pass/

fail maximum limit

Settable between 0 and 20 degrees

rms phase error pass/fail

maximum limit

Settable between 0 and 5 degrees

Frequency error pass/

fail maximum limit

Settable between 0 and 0.1 ppm

Numerical results

rms and peak phase error, frequency error,

pass/fail for each result

Displayed graphical

results

Peak phase error in degrees versus bits and

demodulated bits with settable marker and

pass/fail limits, variable bit and amplitude axes

Multi-measurement

capabilities

1 to 999 bursts; maximum, minimum, and

average phase and frequency error, and worst-

case frequency error results

Concurrency capabilities GMSK multislot-tolerant phase and frequency

error measurements can be made concurrently

with all other measurements

Supplemental characteristics

Frequency error

measurement resolution

0.01 Hz

Phase error

measurement resolution

0.01 degree

Typical rms phase

error uncertainty versus

transmitter actual error