Richard Brooks Modulation
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  • 1. Modulation
    Richard Brooks
    CIS3305
  • 2. What is Modulation?
    Modulation is the conversion of an digitalsignal to a analog signal.
    Modulation is also the process of varying one waveform in relation to another waveform.
  • 3. Process of Modulation
    Modulation
    Demodulation
    Modem
    Analog Modulated
    Signal
    Binary Data
    PSTN
    Modem
    PSDN
    Modem
    Server
    Client
  • 4. Types of Modulation
    There are several forms of modulation
    Amplitude modulation (ex telephone, radio)
    Frequency modulation (ex high-fidelity radio, analog television)
    Phase modulation (ex wireless networks)
    Quadrature amplitude modulation (QAM), which combines amplitude and phase modulation (ex digital cable, HDTV, ADSL and Cable Modems)
  • 5. AM deals with the volume or amplification of the signal.
    Amplitude (low)
    Low
    Amplitude
    (0)
    Amplitude (high)
    High
    Amplitude
    (1)
    1
    0
    Amplitude
    Modulation
    (1011)
    1
    1
    Amplitude Modulation
  • 6. FM has to deal with the size or length of the wave rather then the volume of the signal.
    Wavelength
    Low
    Frequency
    (0)
    Wavelength
    High
    Frequency
    (1)
    0
    1
    Frequency
    Modulation
    (1011)
    1
    1
    Frequency Modulation
  • 7. Phase Modulation
    Two types of waves are used
    Easier for electronic equipment to deal with phase differences
    In Phase
    (0)
    180 degrees
    out of phase
    (1)
    0
    1
    Frequency
    Modulation
    (1011)
    1
    1
  • 8. Quadrature Modulation
    QAM uses two carrier waves, Sine and Cosine.
    Sine wave is out of sync with the cosine wave
    Uses multiple possible amplitude levels
  • 9. Quadrature Modulation
    64-QAM
    16-QAM
  • 10. References
    N6MB.pptx “Modulation” http://wps.prenhall.com/bp_panko_bdnt_6/52/13436/3439647.cw/index.html
    Business Data Networks and Telecommunications, 6/e; Panko, Raymond R. “More on Modulation” Module B pages 496-499