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Electromagnetic Wave

Electromagnetic Wave. Wireless Communication. Cellular Phone Radio Television. http://en.wikipedia.org/wiki/Modulation. Analog Modulation. Amplitude modulation Double-sideband modulation DSB + Double-sideband modulation with unsuppressed carrier (DSB- WC)(used on the radio AM band)

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Electromagnetic Wave

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  1. Electromagnetic Wave

  2. Wireless Communication Cellular Phone Radio Television . . .

  3. http://en.wikipedia.org/wiki/Modulation Analog Modulation • Amplitude modulation • Double-sideband modulation DSB • + Double-sideband modulation with unsuppressed carrier (DSB- WC)(used on the radio AM band) • + Double-sideband suppressed-carrier transmission (DSB-SC) • + Double-sideband reduced carrier transmission (DSB-RC) • Single-sideband modulation • + Single-sideband modulation (SSB, or SSB-AM), very similar to • + single-sideband suppressed carrier modulation (SSB-SC) • Vestigial sideband modulation (VSB, or VSB-AM) • Quadrature amplitude modulation (QAM) • Angle modulation • Frequency modulation (FM) • Phase modulation (PM)

  4. http://www.williamson-labs.com/480_am.htm Amplitude Modulation

  5. Amplitude Modulation

  6. Envelope and Modulation Percentage Transmitted signal: Envelope: Percentage of Modulation: For any message satisfies -1≤ Bm(t) ≤ +1: Over Modulation:

  7. Envelope and Modulation Percentage Transmitted signal: Envelope: Percentage of Modulation: For a message:

  8. http://www.williamson-labs.com/480_am.htm Over Modulation

  9. Envelope Detector Envelope:

  10. Example for Square Wave

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