Li-Fi Technology and Applications

The video discusses the widespread use of wireless communication and its challenges, such as limited spectrum and energy inefficiency. It introduces the concept of using visible light, specifically LED technology, for data transmission, offering a solution to these challenges. The presenter demonstrates a prototype and envisions a future where light sources serve dual purposes of illumination and data transmission, addressing issues of capacity, efficiency, availability, and security.

What is one of the main challenges faced by current wireless communication technology?

• High energy efficiency

• Inexpensive infrastructure

• Unlimited spectrum availability

• Limited capacity and spectrum

Why is the visible light spectrum considered a promising alternative for wireless communication?

• It is less safe than radio waves

• It is more expensive than radio waves

• It is not part of the electromagnetic spectrum

• It is 10,000 times larger than the radio wave spectrum

What is a key property of LED light bulbs that makes them suitable for data transmission?

• They can be modulated at high speeds

• They are always on

• They are very dim

• They are expensive

What technology is used to enable data transmission through light in Li-Fi?

• SIM OFDM and spatial modulation

• Infrared modulation

• Radio wave amplification

• Ultraviolet light conversion

What is demonstrated with the visible light demonstrator?

• Transmission of low-definition video

• Transmission of high-definition video through a light beam

• Transmission of audio signals only

• Transmission of static images

Can Li-Fi technology transmit data when the light appears to be off?

• No, the light must be fully on

• Only during the day

• Only with incandescent bulbs

• Yes, by dimming the light to a low level

Which of the following is a potential application of Li-Fi technology?

• Communication through walls

• Communication using gamma rays

• Communication using sound waves

• Underwater communication

How does Li-Fi technology enhance security in data transmission?

• Light can penetrate through walls

• Data is only transmitted where there is light

• It uses unencrypted signals

• It relies on sound waves

What is the envisioned future for Li-Fi technology?

• Only used in remote areas

• Limited to laboratory use

• Widespread deployment with 14 billion Li-Fis

• Replaced by traditional radio waves

What is the primary benefit of combining illumination with wireless data transmission in Li-Fi?

• Increased energy consumption

• Reduced data security

• Solving capacity, efficiency, availability, and security issues

• Limited to indoor use