Demonstration of bi-directional LED visible light communication using TDD traffic with mitigation of reflection...

Area of Science:

• Optical Communications
• Wireless Networking
• LED Technology

Background:

• Visible Light Communication (VLC) offers a promising alternative for wireless data transmission.
• Reflection interference is a significant challenge in achieving reliable bi-directional VLC.
• Existing VLC systems often struggle with simultaneous uplink and downlink communication.

Purpose of the Study:

• To experimentally demonstrate a bi-directional VLC link using Light Emitting Diodes (LEDs).
• To propose and validate a Time-Division-Duplex (TDD) scheme for mitigating reflection interference.
• To achieve reliable free-space bi-directional data transmission over a 2-meter distance.

Main Methods:

• Implementation of a bi-directional transmission link utilizing LED-based VLC.
• Application of a Time-Division-Duplex (TDD) protocol for managing uplink and downlink paths.
• Employment of On-Off Keying (OOK) modulation for data transmission.

Main Results:

• Successful demonstration of a 2-meter free-space bi-directional transmission link.
• Achieved a Bit Error Rate (BER) of less than 10^-5 in both transmission directions.
• The proposed TDD scheme effectively eliminated reflection interference.

Conclusions:

• The TDD-based bi-directional VLC system using LEDs is a viable solution for robust wireless communication.
• This approach significantly overcomes the challenge of reflection interference in VLC systems.
• The demonstrated system offers reliable and efficient data transmission for various applications.