386 Chapter 14
Real Time TDMA Formats
GSM Framed Modulation
GSM Framed Modulation
This section describes how to build framed, real-time I/Q baseband generated GSM modulation for testing
receiver designs. The procedures in this section build on each other, so perform them sequentially.
NOTE When using multiframe, limit the symbol rate to no more than 271 ksps. Although higher
rates may work, they are not supported.
To build and EDGE and GMSK modulated signal, see “EDGE Framed Modulation” on page 382.
Activating Framed Data Format
1. Press Preset.
2. Press
Mode > Real Time TDMA > GSM > Data Format Pattern Framed.
Configuring the First Timeslot
1. Press Configure Timeslots > Timeslot Type > Access.
2. Press
Configure Access > E > FIX4.
3. Press
1010 > Enter > Return > Return.
Configuring the Second Timeslot
1. Press Timeslot # > 1 > Enter.
2. Press
Timeslot Type > Custom.
3. Press
Configure Custom > Other Patterns > 8 1’s & 8 0’s.
4. Press
Timeslot Off On to On > Return.
Configuring the Third Timeslot
1. Press Timeslot # > 2 > Enter.
2. Press
Timeslot Type > Normal.
3. Press
Configure Normal > E > PN Sequence > PN15.
4. Press
Timeslot Off On to On > Return.
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