Chapter 14 407
Real Time TDMA Formats
NADC Framed Modulation
NADC Framed Modulation
This example teaches you how to build framed real-time I/Q baseband generated NADC modulation for
testing receiver designs. The procedures in this section build on each other and are designed to be used
sequentially.
Activating Framed Data Format
1. Press Preset.
2. Press
Mode > Real Time TDMA > NADC > Data Format Pattern Framed.
Configuring the First Timeslot
1. Press Configure Timeslots > Timeslot Type > Down TCH.
2. Press
Configure Down TCH > Data > FIX4.
3. Press
1010 > Enter > Return > Return.
Configuring the Second Timeslot
1. Press Rate Full Half.
2. Press
Timeslot > 4 > Enter.
3. Press
Timeslot Type > Down TCH.
4. Press
Configure Down TCH > Data > Other Patterns > 4 1’s & 4 0’s.
5. Press
Return > Timeslot Off On to On > Return.
Generating the Baseband Signal
Press NADC Off On to On.
This generates a half rate NADC signal with an active downlink traffic channel timeslot (#1) and an active
downlink traffic channel timeslot (#4). The signal generator may require several seconds to build the signal.
During this time, Baseband Reconfiguring appears on the display. After the reconfiguration is
complete, the display reads NADC On and the NADC, ENVLP, and I/Q annunciators appear. The signal is
now modulating the RF carrier.
The signal’s configuration data resides in volatile memory and is not recoverable after an instrument preset,
power cycle, or reconfigured signal generation.
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