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2074
User Manual
(n)QAM
4-24
generating custom symbols. While the standard (n)PSK modulation
functions use pre-defined phase values, using the Symbol Design
table, you can design and associate any symbol with any vector as
you desire.
Figure 4-15, Symbol Design Table Sample
The (n)QAM panel contains parameters for controlling multiple
amplitude-phase modulation options. To select one of the (n)QAM
functions, click on 16QAM, 64QAM, 256QAM, or User QAM. The
various parameters that control QAM features are described below.
Notice that the parameters are common or all channels and
therefore, there is no separation to individual channels.
Marker Index
The marker setting programs a specific step (index) in the control
data string to output a pulse at the SYNC output connector. The
SYNC State button must be turned on to generate the QAM marker
output.
Baud
The baud parameter sets the rate of which the generator steps
through the amplitude-phase symbols.
Data Table
The Data Table provides means of programming the amplitude-
phase steps sequence. An example of a 64QAM data table
sequence is shown in Figure 4-17. Note that the value of each
symbol is pre-defined and hence, every time you enter a vector, the
associated symbol is automatically fetched from the list and
displayed in the "I" and "Q" fields. The sequence of which the
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