Chapter 4 189
Basic Digital Operation
User-Defined I/Q Maps
Entering I and Q Values
Enter the I and Q values listed in the following table.
1. Press .5 > Enter.
2. Press
1 > Enter.
3. Enter the remaining I and Q values.
As the I value updates, the highlight moves to the first Q entry (and provides a default value of 0), and an
empty row of data appears below the first row. As the Q value updates, and the highlight moves to the next I
value. As you press the numeric keys, the numbers display in the active entry area. If you make a mistake,
use the backspace key and then retype.
Also note that 0.000000 appears as the first entry in the list of Distinct Values, and that 0.500000
and 1.000000 are listed as the distinct values.
Displaying the I/Q Map
1. Press
Display I/Q Map
An I/Q map generated using the current values in the I/Q Values table editor is displayed.
The map in this example has four symbols. The map uses the following four unique values: 0.5, 1.0,
−0.5, and −1.0 to create the four symbols. It is not the number of values that defines how many symbols
a map has, but how those values are combined.
2. Press
Return.
When the contents of a table editor have not been stored, I/Q Values (UNSTORED) appears on the
display. Follow the instructions in the next section to store the custom I/Q table.
Symbol Data Bits I Value Q Value
0 0000 0.500000 1.000000
1 0001 −0.500000 1.000000
2 0010 0.500000 −1.000000
3 0011 −0.500000 −1.000000
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