Real-Time I/Q Baseband Generator User’s and Programming Guide
2-15
HP ESG Family Signal Generators
Using Functions
Options UN8 and 202
Mapping Symbol Positions with the I/Q Table Editor
Mapping Symbol Positions with the I/Q Table Editor
In modulation schemes defined by standards (such as TDMA and CDMA), symbols appear
in default positions in the I/Q plane. The I/Q table editor provided in Option UN8 enables
you to do the following:
• Create a unique mapping of symbols.
You can create a mapping that is not supplied as a default. You can also create a
non-standard mapping; this is often necessary for a proprietary modulation scheme.
• Change the position of one or more symbols in a standard mapping.
This is often done to test the sensitivity of a receiver, or to create a symbol mapping that
is similar to a default.
The examples in this section provide information on how to create an I/Q map (on
), how to edit a default map (on
), how to globally change a value in an
I/Q table (on
), and how to use a stored I/Q map (on
Four data bits define each symbol.
Unique I and/or Q levels
A map in I or Q is limited to 16 unique levels.
You can generate up to 256 unique states.
I and Q values
Levels do not have to be symmetric.
Active entry area
Maximum of 16 unique levels
Define User I/Q
softkey menu
Summary of Contents for ESG series
Page 2: ...ii ...
Page 446: ...I 16 Index Index ...
