Communications Blockset

Scatter Diagrams

A scatter diagram of a signal plots the signal's value at a given decision point. In the best case, the decision point should be at the time when the eye of the signal's eye diagram is the most widely open.

The two blocks, Continuous-Time Eye and Scatter Diagrams and Discrete-Time Eye and Scatter Diagrams, both produce scatter diagrams. One processes continuous-time signals and the other processes discrete-time signals. They also differ in the way you determine the decision timing: the Continuous-Time Eye and Scatter Diagrams block plots a new point every time a trigger signal has a rising edge, whereas the Discrete-Time Eye and Scatter Diagrams block plots new points periodically according to a mask parameter.

Eye Diagrams

Example: Using Eye and Scatter Diagrams