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Modulation Techniques

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Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.

Modulation is a technique used to transmit some information (digital or analog) by encoding the information onto an analog carrier signal. Modulation is used by modems to transmit digital data signals over analog transmission lines such as the public telephone network. Modems at each end of the communication link perform the digital-to-analog and analog-to-digital conversion.

The information signal is modulated onto an analog signal at a specific frequency called the carrier.

This topic continues in "The Encyclopedia of Networking and Telecommunications" with a discussion of the following:

  • Modulation techniques
  • AM (amplitude modulation)
  • FM (Frequency modulation)
  • PM (phase modulation)
  • Bit encoding and QAM (quadrature amplitude modulation)
  • Spread spectrum signaling
  • OFDM (orthogonal frequency division multiplexing)

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