Chapter 13 379
Custom Digital Modulation
Using the Real Time I/Q Baseband Generator
Creating User-Defined Custom Modulation
This section teaches you how to perform the following tasks:
• “Selecting Data” on page 379
• “Configuring the Filter” on page 379
• “Selecting a Symbol Rate” on page 379
• “Selecting the Modulation Type” on page 379
• “Configuring the Burst Rise and Fall Parameters” on page 380
• “Activating Differential Data Encoding” on page 380
• “Generating the Waveform” on page 380
• “Configuring the RF Output” on page 380
Selecting Data
1. Press
Preset.
2. Press
Mode > Custom > Real Time I/Q Base Band > Data > FIX4.
3. Press
1010 > Enter > Return.
Configuring the Filter
1. Press
Filter > Select > Gaussian.
2. Press
Filter BbT.
3. Press
.45 > Enter > Return.
Selecting a Symbol Rate
1. Press
Symbol Rate.
2. Press
25 > ksps > Return.
Selecting the Modulation Type
Press
Modulation Type > Select > QAM > 32QAM > Return.
For information on user-defined I/Q mapping, see “User-Defined I/Q Maps” on page 188. For information
on user-defined FSK modulation, see “User-Defined FSK Modulation” on page 192.
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