188 Chapter 4
Basic Digital Operation
User-Defined I/Q Maps
User-Defined I/Q Maps
In modulation schemes defined by standards (such as TDMA and CDMA), symbols appear in default
positions in the I/Q plane. Using the I/Q Values table editor, you can define your own symbol map by
changing the position of one or more symbols. The I/Q Values is available for custom real-time I/Q
baseband generator waveforms and real-time I/Q baseband generator TDMA waveforms. It is not available
for waveforms generated by the dual ARB waveform generator.
Creating a User-Defined I/Q Map
This section teaches you how to perform the following tasks:
• “Accessing and Clearing the I/Q Table Editor” on page 188
• “Entering I and Q Values” on page 189
• “Displaying the I/Q Map” on page 189
Use the following procedure to create and store a 4-symbol unbalanced QPSK modulation.
Accessing and Clearing the I/Q Table Editor
1. Press
Preset.
2. Perform the following keypress sequence required for your format type.
For Custom Format
Press
Mode > Custom > Real Time I/Q Base Band > Modulation Type > Define User I/Q >
More (1 of 2) > Delete All Rows > Confirm Delete All Rows.
For TMDA Formats
Press
Mode > TDMA > desired format > More (1 of 2) > Modify Standard > Modulation Type > Define User I/Q >
More (1 of 2) > Delete All Rows > Confirm Delete All Rows.
This loads a default 4QAM I/Q modulation and clears the I/Q Values table editor.
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