Wireless Audio Transceiver using Visible Light based Link

Project Title

Wireless Audio Transceiver using Visible Light based Link

Project Area of Specialization Information & Communication TechnologyProject Summary

Visible light communication (VLC) is emerging as an advanced means for wireless communication because of its wide bandwidth range and super-fast data transmission. VLC works on the principle of modulating the intensity of Light-emitting diodes (LEDs), converting the information into the optical form and doing the transmission in the visible light spectrum. The purpose of this project is to design and implement a wireless audio transceiver using visible light as the communication mode. The communication system will be capable of transmitting/receiving real-time audio information under ambient lightning conditions over a range of 2 to 3 meters. After the necessary signal processing, the LED-based transmitter will modulate the signal using On-Off keying modulation scheme and propagate information by the rapid flickering of white LEDs. Optical waveforms will be captured by a photodiode (PD) at the receiver end. The converted electrical signal will then be decoded to recover the transmitted audio. Signal processing will be done using a microcontroller on both the transmitter and receiver sides. This project will be based upon hardware and software implementation. Software simulation will be done using OptiSytem and the hardware will be designed such that it can operate in a working lab environment.

Project Objectives

• To develop an optical wireless transceiver to transmit/recover audio signals in a lab environment.
• To carry out audio transmission in real-time.
• To assemble an audio communication system that is expected to cover a range of 2 to 3 meters.
• To make the system work in ambient lighting.

Project Implementation Method

• Software model development and implementation using OptiSystem.  
• Interfacing MATLAB with OptiSystem for real-time audio signal processing.  
• Hardware implementation of a VLC transceiver:
  • Storage and processing of audio signals through microcontrollers.
  • Transmission of data through LEDs.
  • Reception and decoding of data at the receiver.
  • Processing of retrieved signal and synthesize the audio signal.

Benefits of the Project

By considering VLC as an alternative to the conventional RF setup, communication systems can be developed with high bandwidth, faster data rates, stronger immunity to electromagnetic interference, unlicensed channel, and low power consumption. VLC is not affected by electromagnetic interference, so it may be a viable choice of communication in many applications e.g. hospitals, underwater, in mines etc. wherever audio signals are required to be transmitted. In recent years, cybersecurity has become a pressing issue because communication link is open and susceptible to intruders. Establishing a VLC link can ensure privacy and resolve this security threat since optical light cannot penetrate objects. If a VLC link is established inside a confined space, it will be impossible for people outside to gain access to that information.

Technical Details of Final Deliverable

Hardware/ software integrated communication system that can transmit/receive real-time audio signals.

Final Deliverable of the Project HW/SW integrated systemCore Industry TelecommunicationOther Industries IT Core Technology OthersOther TechnologiesSustainable Development Goals Industry, Innovation and InfrastructureRequired Resources

Item Name	Type	No. of Units	Per Unit Cost (in Rs)	Total (in Rs)
			Total in (Rs)	78600
PCB and Fabrication	Equipment	2	800	1600
Microcontroller kit	Equipment	2	5000	10000
Others	Miscellaneous	1	10000	10000
High power white LEDs	Equipment	10	300	3000
MOSFET N-Channel	Equipment	5	200	1000
photodiode	Equipment	8	3000	24000
High Speed Operational Amplifier	Equipment	6	2000	12000
Analog Comparators	Equipment	5	1000	5000
Operational Amplifiers 500MHz	Equipment	6	2000	12000