What do "D1" and "inf" mean in the attached fig?

I am trying to test a QPSK transceiver. What do "D1" and "inf" mean in the QPSK transmitter and receiver in the figures on the web page https://www.mathworks.com/help/comm/examples/qpsk-transmitter-and-receiver-1.html

Answer 1

[Sebastian Castro]

These are labels given to the sample times in the model, when you enable sample time display.

• D1 refers to the first (fastest) discrete sample time in the model.
• Inf refers to a constant sample time; in other words, the signal does not change unless you modify its constant value during runtime.

Refer to https://www.mathworks.com/help/simulink/ug/types-of-sample-time.html for more information.

- Sebastian

[Samir Soliman]

Thank you Sebastian.