Master the art of encoding digital data onto analog carrier waves. An interactive study guide for EEE 464-Digital Communication Systems
Varies the amplitude of the carrier wave to represent binary data. Simple but susceptible to noise.
Changes the frequency of the carrier. More robust against noise than ASK, commonly used in modems.
Manipulates the phase of the carrier. Highly bandwidth efficient. Basis for complex schemes like QPSK and QAM.
Select a modulation scheme and input a binary sequence to see the waveforms.
Max 8 bits for clarity.
In ASK, a high amplitude represents '1' and zero amplitude represents '0'. It's like turning a light on and off to send Morse code.
A graphical representation of the complex envelope of each symbol. The X-axis represents the In-Phase (I) component and the Y-axis represents the Quadrature (Q) component.
| Feature | ASK | FSK | PSK |
|---|---|---|---|
| Variable Parameter | Amplitude | Frequency | Phase |
| Noise Immunity | Low | High | Very High |
| Bandwidth | Narrow | Wide | Narrow |
| Complexity | Low | Medium | High |
| Bit Error Rate | High | Low | Lowest |