ABSTRACT Thesis: UNDERWATER OPTICAL WIRELESS COMMUNICATION ...
Wireless optical communication system
Transcript of Wireless optical communication system
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GUIDE- MADE BY-
MS. PINKI NAYAK VIBHU
MS. BINDU E. 00910497610
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INTRODUCTION Replace radio waves with beams of light . Works in the infrared or near infrared region of light . Consists of transreceiver.
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Optical Intensity Modulation
Direct Detection
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Channel Topologies
Point-to-Point Link
Diffuse link Quasi Diffuse Link
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Direct‚ unobstructed path between a transmitter and a receiver.
Sensitive to Blocking and shadowing.
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Radiate optical power over a wide solid angle.
Provide mobility to the receiver.
High path loss.
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Inherit aspects of both point-to-point and diffuse links.
Slowly diverging beam sources which
illuminate a grid of spots on the ceiling.
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Advantages Low cost, base-band
circuit design
High date rates (Gbps) less multi access
interference
No need to pay for spectrum license
Disadvantages
Cannot pass through walls Sensitive to blocking
Limited Transmit Power
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LIGHT WAVE RADIO WAVE
BANDWIDTH VIRTUALLY UNLIMITED LIMITED BANDWIDTH
PASSES THROUGH WALL
NO YES
COST LOW HIGH
SPEED HIGH LOW
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Short range (cm – m)
Chip-to-Chip Interface
Medium range (m – 10 m)
Wireless Optical LAN
Long range (km)
Free-Space Optical Communications
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It can be used to illuminate the room while serving as a medium for data transfer.
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It can be used to transfer data at high speed for long distance
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It can be used for high speed long distance data transfer using satellite.
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Without any licensing hurdle provide high speed and high bandwidth communication.
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REFERENCES R. Gfeller and U. Bapst. Wireless in-house communication via diffuse
infrared radiation. Proceedings of the IEEE, 67(11): 1474–1486, November 1979. J. R. Barry. Wireless Infrared Communications. Kluge Academic Publishers, Boston, MA, 1994 . R. Otte , L. P. de Jong and A. H. M. van Roermund. Low-Power Wireless Infrared Communications. Kluwer Academic Publishers, Boston, MA, 1999. S. Hranilovic. Spectrally Efficient Signalling for Wireless Optical Intensity Channels. PhD thesis, Dept. of Elec. & Comp. Engineering, University of Toronto, 2003. [1]
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THANK YOU