PRESENTED BYK.VISHAL(14DC24)V.VISHWANANTHAM(15CH02)

Light based WI-FI Light is used instead of radio-waves to transmit information Transceiver fitted LED lamps acts like Wi-Fi modems LED lamps can light a room as well as transmit-receive information Provides illumination as well as data communication

Radio spectrum is congested, but the demand for wireless data doubles each year Issues regarding radio spectrum, such as capacity, availability, efficiency, security are solved using LIFI. Speed of data transmission can be increased.

CAPACITY Spectrum is 10,000 times greater than that of radio

frequency EFFICIENCY

Highly efficient since LED consumes less energy AVAILABILITY

Light waves available everywhere. SECURITY

Cannot penetrate through walls. Hence data cannot be intercepted.

Operational procedure is very simple. If LED is ON, digital data ‘1’ is transmitted & if LED is OFF, digital data ‘0’ is transmitted. LEDs varies in intensity so fast that a human eye cannot detect it A controller connected at the back side of these LEDs is used to code data. Also called as 5G optical communication.

All the data from Internet is streamed into lamp driver.Data from internet is used to modulate the intensity of LED light source.Thus by fast and subtle variations of current, optical output can be made to vary at extremely high speedThe photodetector picks up the signalThe receiver dongle then converts the tiny changes in amplitude into a data stream.

Data rate greater than 10 Gbps; Theoretically allowing HD film to be downloaded in 30 seconds Can be used anywhere, even in RF restricted areas; Since light waves will not interfere with radio waves. Mostly LED light bulbs are used, which consumes less energy. Hence cost efficient. As light waves cannot penetrate through walls, the data cannot be intercepted; Thus provides secured communication. Efficient alternative to radio based wireless; since it is quick and reliable.

High Fidelity reproduction is used by home stereo listeners and home audio enthusiasts refer to high-quality reproduction of sound to distinguish it from the poorer quality sound produced by inexpensive audio equipment, or the inferior quality of sound reproduction characteristic of recordings made until the late 1940s.

high-fidelity equipment has minimal amounts of noise and distortion and an accurate frequency response.

Gi-Fi or Gigabit Wireless is the world's first transceiver integrated on a single chip that operates at 60GHz on the CMOS process. Gi-Fi allows wireless transfer of audio and video data up to 5 gigabits per second. Gi-Fi is ten times the current maximum wireless transfer rate usually within a range of 10 meters.The Gi-Fi operates on the 60GHz frequency band.The Gi-Fi measures 5mm square and it is manufactured using existing complementary metal – oxide-semiconductor(CMOS)

technology.It was developed at the National Information And Communication Technology Research Center in MELBOURNE,AUSTRALIA.

The core components of a GI-FI system is the subscriber station which available to several access points.

It is based on standards of IEEE 802.15.3C

The wireless span is computer network used for communication among computer devices (including telephones and personal digital assistants) close to one person

An 802.15.3c based system often uses small antenna at the subscriber station. The antenna is mounted on the roof. It supports line of sight operation.

Use of Time Division Duplex for both transmission and receiving. Conversion of data from IF range to RF60Ghz rangeThe incoming RF signal is first down converted to an IF signal centered at 5 GHz and then to normal data ranges.Then use heterodyne principle for this process to avoid leakages. And then data is transferred.

High speed of data transfer Low power consumption High security Cost effective Small size Quick deployment Highly portable

iDEN is a mobile telecommunications technology, developed by Motorola , which provides its users the benefits of a trunked radio and a cellular telephone .

iDEN places more users in a given spectral space, compared to analog cellular and two-way radio systems, by using speech compression and time division multiple access TDMA .

iDEN is designed, and licensed, to operate on individual frequencies that may not be contiguous. iDEN operates on 25kHz channels, but only occupies 20 kHz in order to provide interference protection via

guard bands.

iDEN technology offers you more than just a wireless phone. It's a Motorola complete communications system that you hold in your hand. Combining speakerphone, voice command, phone book, voice mail, digital two-way radio, mobile Internet and e-mail, wireless modems, voice activation, and voice recordings so that you can virtually recreate your office on the road.

iDEN technology is a highly innovative, cutting-edge system of technologies developed by Motorola to create an ideal, complete wireless communications system for today's fast-paced, busy lifestyle. Advanced capabilities bring together the features of dispatch radio, full-duplex telephone interconnect, short messaging service and data transmission

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