Li fi-130402084458-phpapp01
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Li fi-130402084458-phpapp01 Li fi-130402084458-phpapp01 Presentation Transcript

  • LIFI
  • Introduction to Li- Fi Wireless communication through Light illumination
  • Present Wireless Communication  Radio spectrum  1.4 Million base stations, 5 billion Mobile stations  600tb data every month
  • Wireless Communication, a utility  Personal life  Business life  Hospitals  Research and development  Security
  • Issues regarding Radiospectrum
  • Capacity  Radiowaves  Cost and Expensive  Less Bandwidth compared to other spectrums  Insufficient spectrum for increasing data Efficiency  Millions of basestations consume huge amount of energy for 1.Transmitting the radio waves 2.To cool the base station cabins  5% Efficiency
  • Availability  Available within the range of Base stations  Limited availabity  Unavailable in aircrafts Security:  Less secure(passes through the walls)
  • Is not used generally Used for hospit als Good to use But harmful to human Expensiv e, Limited Bw Less Secure Which is not used so far Safe to use Larger bandwith
  • How Li-Fi?  Normal light power is replaced by LED light power  The LED bulb will hold a micro-chip that will do the job of processing the data.  The light intensity can be manipulated to send data by tiny changes in amplitude  Properties of LED: (Fundamental property of LI-FI) 1.Intensity can be modulated into very high speeds and varying amplitudes 2.LED can be switched on and off with very high speed
  • Infrared rays in Remote control •Single data stream •20000 bits per second •Not usable for vedio streaming
  • LI-FI
  • LI-FI •Light power(LED) •Multiple data stream •High speed •Technologies used in LI-FI: SIM-OFDM and Spatial modulation
  • Advantages • Largers bandwidth (10,000 times the radio bandwidth) • High efficiency • More availability • Highly secure
  • DISADVANTAGE Presence of Light is essential
  • APPLICATIONS
  • 1.In RF restricted Environments
  • 2.Hospitals(In few medical instruments)
  • In vehicles and traffic lights,reducing accidents and traffic congestion
  • Street lamps(as free access points)
  • In Aircraft cabins
  • Conclusion •Overcomes the limitations of radio spectrum •High speed of 10 Gbps can be achieved •Lifi can solve the foressential problems of wireless communications these days