Sunday, June 4, 2017

The Optical Wireless Communication Li-Fi which is 100 times faster than WiFi is the Future Broadband Internet


5G Networks could be the next thing in the wireless communication systems as projected in the last Embedded world in Manchester but it could still not be the only next generation wireless communication system emerging as perhaps we can not do without light in this trend.

 The problem with conventional WiFi is that can become extremely irritating especially when too many connections get logged on to the same hotspot. That’s just an inherent fault of WiFi whose protocols share the bandwidth even if that ultimately means no user gets satisfied.

Increasing penetration of smartphones coupled with high demand for mapping portals is expected to stimulate the market for photodetectors components in communication systems. Increasing demand for real-time traffic updates is anticipated to foster the demand for Li-Fi over the period. Up-gradation of prevailing lighting system to communication system might act as a factor for adoption of this technology. However, lack of infrastructure for wireless technology in developing countries is expected to hinder the growth of light fidelity market.
The light fidelity market is classified on the basis of components into photodetectors, LED and microcontrollers. The LED-based light fidelity device can generate the string of binary numbers by switching it on and off and by using the mixture of red, blue and green LEDs the data can be encoded in light by confirming the flickering rate to alter the light frequency. The component transmits the data through the different part of the spectrum. The technological improvements in LED have given a solution by using light for high-speed wireless communication. Photodetectors such as the photodiode are used in detecting and sensing images in the transmitted signal. The demand for image sensing and detecting is increasing owing to its uses in different sectors which are expected to boost the demand for photodetectors in the forecast period. Microcontrollers modulate the data using modulation techniques such as pulse width modulation.
The idea of supporting wireless communication through lights came as a result of this WiFi flaw. LiFi has proved capable of sending data at speeds of up to 1GBps, around 100 times faster than most current Wi-Fi connections. 
The future may soon consist of LED light bulbs connected to a wireless mesh network bringing high-density connections to residential areas and eliminating wireless communication dead zones.
Visible Light Communication (VLC) is not a new technology. In fact, it is quite old. Its history can be traced back in the 1800s with Alexander Graham Bell’s photophone, which used modulated sunlight to transmit speech. VLC is the transfer of information through the use of the visible light portion of the electromagnetic spectrum.
LiFi, one subset of the optical wireless communication technologies, uses VLC between 400 and 800 THz—much higher than most used radio frequencies. A majority of people are probably more familiar with the lower end of the RF spectrum that supports WiFi—2.4GHz and 5GHz.
Devices equipped with special Light Emitting Diodes (LED) can wirelessly send and receive data 100 times faster than WiFi. In a perfect lab environment, LED communication can reach speeds of 224Gbps. The LED bulbs are dipped and dimmed, up and down, at extremely high speeds not visible to the human eye, contrary to the “visible light spectrum” description. Then, another device with a photodetector reads and converts that light into electrical signal.
LiFi’s strengths make it a highly convincing and worthy investment. The technology’s throughput reaches speeds never thought possible, and its wider bands support more users than WiFi.
However, it has weaknesses, too. Due to its higher frequency, its range is shorter and the area it can cover is smaller. Using LiFi would mean using more transmitters, which increases deployment cost. Because VLC system needs light to communicate, it requires near line-of-sight communication. Devices don’t necessarily need to see each other to exchange data because light can bounce off objects but the waves cannot penetrate walls. Although LiFi’s narrow coverage is a disadvantage, it also offers a security benefit. With shorter range, the footprint is easier to control, and wireless hacks can be avoided.
Will LiFi replace WiFi in the future? Probably not. But both technology can supplement each other. LiFi will be able to support: more clients without channels overlapping; higher speeds when necessary; and stronger security when required. It can also be used in electromagnetic sensitive areas where the use of RF could be hazardous.
LiFi, indeed, is a promising technology that will, hopefully, continue to develop and improve wireless communication.

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