Healthcare Technology

B N M Institute of Technology

Lifi – Blind Indoor Navigation System For Visually Impaired People


In world of wireless technology, the number of devices accessing the internet is growing every second. Most of the devices use wireless communication for sharing data between devices through internet, this has unfortunately led to an increase in network complexity, shortage of wireless radio bandwidth and an increased risk of interference of radio frequencies put limitation on radio frequency which is used in WiFi (Wireless Fidelity).
Li-Fi is a new technology which uses visible light for communication instead of radio waves. It refers to 5G Visible Light Communication systems using Light Emitting Diodes as a medium to high speed communication in a similar manner as Wi-Fi. It can help to conserve a large amount of electricity by transmitting data through light bulbs and other such lighting equipment’s. Li-Fi uses light as a carrier as opposed to traditional use of radio waves as in Wi-Fi and this means that it cannot penetrate walls, which the radio waves are able to. It is typically implemented using white LED bulbs at the downlink transmitter.
By varying the current through the LED at a very high speed, we can vary the output at very high speeds. This is the principle of the Li-Fi. The working of the LiFi is itself very simple if the LED is ON, the signal transmitted is a digital 1 whereas if it is OFF, the signal transmitted is a digital 0. By varying the rate at which the LEDs flicker, we can encode various data and transmit it.

Project Team

Nagarjuna T V, Shravan Gupta, Shashank A S, Roopesh Kumar
Electronics and Communication Engineering


Prof. Priyadarshini K Desai
B N M Institute of Technology
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