1 / 10

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)

Download Presentation

Electromagnetic Wave

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related