Modulation

Modulation is the process of embuing a signal inside a Carrier Wave in order to convey information through that wave.

Taxonomy

• Modulation
  • Analog Carrier
    • Analog Data
      • AM (Amplitude Modulation)
        • The data signal varies the carrier’s amplitude
      • FM (Frequency Modulation)
        • The data signal varies the carrier’s frequency
      • PM (Phase Modulation)
        • The data signal varies the carrier’s phase
    • Digital Data
      • ASK (Amplitude Shift Keying)
        • The data signal varies the carrier’s amplitude
      • FSK (Frequency Shift Keying)
        • The data signal varies the carrier’s frequency
      • PSK (Phase Shift Keying)
        • The data signal varies the carrier’s phase
      • QAM (Quadrature Amplitude Modulation)
        • The data signal varies both the carrier’s amplitude and phase simultaneously
  • Digital Carrier
    • Analog Data
      • PAM (Pulse Amplitude Modulation)
        • The analog data varies the amplitude of each pulse
      • PWM (Pulse Width Modulation)
        • The analog data varies the duration of each pulse
      • PPM (Pulse Position Modulation)
        • The analog data varies the timing of each pulse
    • Digital Data
      • PCM (Pulse Code Modulation)
        • The data is represented as a coded binary pulse pattern
      • OFDM (Orthogonal Frequency Division Multiplexing)
        • The data is distributed across multiple frequency subcarriers, each independently modulated