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Simulation of ASK, FSK, and PSK using MATLAB Simulink (with Online Simulator)


๐Ÿ“˜ Overview ๐Ÿงฎ How to use MATLAB Simulink ๐Ÿงฎ Simulation of ASK using MATLAB Simulink ๐Ÿงฎ Simulation of FSK using MATLAB Simulink
  • ๐Ÿงฎ Simulation of PSK using MATLAB Simulink
  • ๐Ÿงฎ Simulator for ASK, FSK, and PSK
  • ๐Ÿงฎ Digital Signal Processing Simulator
  • ๐Ÿ“š Further Reading
  • ๐Ÿ“š BER vs SNR Simulation
  • ๐Ÿ“š Constellation Simulation


    • Simulation of Amplitude Shift Keying (ASK) using MATLAB Simulink

    In Simulink, we pick different components/elements from MATLAB Simulink Library. Then we connect the components and perform a particular operation.

    Result

    A sine wave source, a pulse generator, a product block, a mux, and a scope are shown in the diagram above. The pulse generator generates the '1' and '0' bit sequences. Sine wave sources produce a specific amplitude and frequency. The scope displays the modulated signal as well as the original bit sequence created by the pulse generator. Mux is a tool for displaying both modulated and unmodulated signals at the same time.

    The result section shows that binary '1' is modulated by a certain sine wave amplitude of 1 Volt, and binary '0' is modulated by zero amplitude.

    Simulation of Frequency Shift Keying (FSK) using MATLAB Simulink

    Result

    The diagram above shows two sine wave sources, a pulse generator, a switch, a mux, and a scope. The pulse generator generates the '1' and '0' bit sequences. Two different frequencies are provided by sine wave sources. The result section shows that binary '1' is modulated at a higher frequency than binary '0'.

    Simulation of Phase Shift Keying (PSK) using MATLAB Simulink

    Result

    In the result section, binary '1' is modulated with a 180-degree phase shift (corrected), whereas binary '0' is modulated with the original 0-degree phase.

    Simulator for Binary ASK Modulation
    Simulator for Binary FSK Modulation
    Simulator for Binary PSK Modulation
    Mathematical Background

    1. Amplitude Shift Keying (ASK)

    The signal is represented by changing the amplitude of the carrier wave. For Binary ASK:

    $$s(t) = \begin{cases} A \cos(2\pi f_c t) & \text{for bit 1} \\ 0 & \text{for bit 0} \end{cases}$$

    2. Frequency Shift Keying (FSK)

    The frequency of the carrier is shifted between two discrete values ($f_0$ and $f_1$):

    $$s(t) = \begin{cases} \cos(2\pi f_1 t) & \text{for bit 1} \\ \cos(2\pi f_0 t) & \text{for bit 0} \end{cases}$$

    3. Phase Shift Keying (PSK)

    The phase of the carrier is shifted by 180° ($\pi$ radians) to represent different bits:

    $$s(t) = \begin{cases} \cos(2\pi f_c t) & \text{for bit 1 (0 rad)} \\ \cos(2\pi f_c t + \pi) & \text{for bit 0 (\(\pi\) rad)} \end{cases}$$
    ASK, FSK, PSK Constellation Diagrams Simulation →
    ASK, FSK, PSK BER vs SNR Simulation →

    Read More about

    1. Online Simulator for Amplitude Modulation (AM)
    2. Online Simulator for Frequency Modulation (FM)
    3. Online Simulator for Phase Modulation (PM)
    4. QPSK Modulation and Demodulation using MATLAB Simulink


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