This simulation demonstrates the three fundamental digital modulation techniques: ASK (Amplitude Shift Keying), FSK (Frequency Shift Keying), and PSK (Phase Shift Keying). The top waveform is the digital input signal, which controls the modulation. The green waveform shows ASK, where amplitude changes with the digital input. The orange waveform represents FSK, where frequency shifts based on logic levels. The red waveform shows PSK, where the phase of the carrier signal flips according to the in

QPSK Modulation and Demodulation