Transmitter model

In this example, a transmitter using QAM modulation is realised. In addition, this model shows the possibilities of implementing frequency cancellation. The operation of frequency cancellation is demonstrated by constructing a constellation before and after the phase shift.

To plot the constellation, we will use the graph window and select the "Signal Constellation" display type with the settings below.

Constellation before phase shift

Constellation after phase shift

Conclusion

In this example we have learnt the construction of a phase-shifted transmitter system and the tools to map a constellation into the model.

Blocks used in example

• Phase/ Frequency Offset
• Random Integer Generator
• Rectangular QAM Modulator Baseband
• Terminator