Digital Modulation

Introduction

The purpose of this experiment is to explore several techniques for transmitting digital information over wires.

Procedure

1. Start Commsim and open the diagram file Serial_to_Parallel.vsm in the Digital folder.

2. Simulate the circuit. You should see results similar to the following:

3. Can you see how each serial group of four bits becomes a new level on the upper plot?

4. Open the diagram file Mux_Demux.vsm in the Digital folder.

5. Simulate the circuit. The results should look similar to the following:

6. Experiment with the Mux / Demux parameters and note the affect on the signals.

7. Choose another digital circuit to simulate by browsing through the examples.

Discussion

While reviewing your data and results, provide detailed answers to each of the following:

1. Discuss the advantages / disadvantages of serial versus parallel communication.

2. Why did you choose your circuit over others in Step 7?