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WEBINAR ON “Indigenous Li-Fi 5G test bed at IIT Delhi” (August 5, 2021: Online)

August 5, 2021 @ 9:30 am - 4:00 pm

IIT Delhi, in partnership with TSDSI, organised a Webinar on “Indigenous Li-Fi 5G test bed at IIT Delhi” on 5th August 2021 at 0930 to 1600 IST. A research project titled “Building an end to end 5G Test Bed” has been executed as a multi-institute collaborative project with participation from eight institutes – IIT Bombay, IIT Delhi, IIT Hyderabad, IIT Madras, IIT Kanpur, IISc Bangalore, CEWiT and SAMEER. Each one would be contributing to the test bed in a complementary manner based on the expertise and interest of each institute.

Test Bed Initiative at IIT Delhi: With the world racing towards 5th generation broadband wireless technologies on all fronts, it is a crucial phase for telecom R&D and product development in India, considered one of the three largest telecom markets of the world. 5G Research and Standardization is reaching its global peak, and technology demonstration and test beds have started gaining momentum. With a number of Government initiatives such as smart cities, Digital India and BharatNet depending heavily on the communication infrastructure, early leads by India in 5G technology development and deployments are very crucial to the country. It is also a golden opportunity to close the gap in telecom manufacturing in the country. Faculty and research scholars at IIT Delhi are developing innovative solutions in areas of i) Energy Harvesting in IoT systems ii) Security iii) Light Fidelity iv) Cost Effective Air pollution monitoring system v) Multi Access Edge Computing with Haptics application vi) Selective Algorithms in MIMO. The developed components (both hardware and software) will be connecting on wireless Heterogeneous protocols, showcasing smart campus solutions.

Schedule: 5 August 2021, 0930 – 1600 IST

Venue: Online

Workshop Recordings:

Program Schedule:

Session Title Start Time End Time Session Details

Inaugural Session

09:30 09:45

Opening Address by Prof. Huzur Saran

Professor, Department of Computer Science & Engineering, Indian Institute of Technology, Delhi; PI of the Project “Building an end to end 5G Test Bed” in IIT Delhi

09:45 10:00

Keynote by Prof. Brejesh Lall,

Professor, Electrical Engineering Department, Co-ordinator Of Electrical Department, Indian Institute of Technology Delhi; Co-PI of the Project “Building an end to end 5G Test Bed” in IIT Delhi


Expert Talk #1:

Introduction to VLC: challenges and solutions






Prof Abhishek Dixit

Assistant Professor, Department of Electrical Engineering, Indian Institute of Technology, Delhi

The lecture starts with the introduction of visible light communication (VLC) networks. The first step in understanding a VLC network is to understand the channel. We see what the features of the VLC channel are and what is really possible over this. Then, we go towards the challenges on the physical layer concerning modulation and demodulation. We then propose various multiplexing schemes for VLC. In the end, we touch upon the critical medium access control (MAC) issues.

Expert Talk #2:

Overview of TSDSI

11:15 11:45 Mr. A.K. Mittal, Advisor-Networks, TSDSI.

Expert Talk #3:

MAC protocols and solutions

(by Anjali)





With Research Scholar working under the guidance of Prof Abhishek Dixit, Assistant Professor, Department of Electrical Engineering, IIT Delhi

The lecture starts with the introduction of the media access control (MAC) layer and its importance. It then briefs wireless communication MAC of low-rate wireless personal area network (LR-WPAN) and wireless fidelity (Wi-Fi). After which, it clarifies the relation of visible light communication (VLC) and light fidelity (Li-Fi) with the above two wireless MACs. We then investigate the problems for the VLC MAC along with the ongoing research activities and standardization. In the end, we conclude the lecture with a discussion on open research topics.

Networking Break (12:45 to 14:00)
Expert Talks #4

Video recording of the demos Demo#1

Lens design (by Utkarsh)


14:00 to 16:00

With Staff and Research Scholars working under the guidance of Prof Abhishek Dixit, Assistant Professor, Department of Electrical Engineering, IIT Delhi

14:00 14:20

This demo considers the use of rotationally symmetric aspheric GRIN lenses for arbitrary shaped optical wireless communication channels. The receiver lens design is discussed, and design examples for hexapolar and conical ray release are presented. The optical design procedure includes non-sequential ray tracing, the mapping method, and the edge-ray principle for focusing non-paraxial rays. Optical ray-tracing simulations with realistic models are used for model validation in COMSOL Multiphysics®.


VLC Tx and Rx: (by Vaibhav)

14:20 14:40

Demonstration of Li-Fi downlink by transferring a sine signal between LED (Tx) and photodetector (Rx). This acts as a frontend of the transmitter and receiver of the Li-Fi link.


VLC design in FPGA 

(by Ankit and Krishnadeep)

14:40 15:00

In this demo, we demonstrate pulse amplitude modulation (PAM) schemes used for the Li-Fi network over FPGA. The audio signal or a Psuedo Random Binary Sequence (PRBS) is used to input this system. The ZYNQ Ultrascale+ Xillinx FPGA boards have been used with ADC/DAC card (Abacco FMC150) to implement this scheme.


VLC in USRP (by Dr Arun)

15:00 15:20

This demo aims to design a physical layer of a simplex Li-Fi link that achieves a high data rate. The physical layer integrates the host computer, transmitter, and receiver. The transmitter and receiver are designed using Universal Software Radio Peripheral (USRP) using software-defined radio concepts. Digital modulation techniques like BPSK, QPSK, QAM 16 have been developed and tested. We demonstrate the QPSK modulation scheme through USRP, which achieves up to 5 Mbps data rate.


VLC uplink (by Mayank)





Demonstration of Li-Fi uplink by enabling the communication link between the two FPGA boards (ZCU102 ultrascale+) using PCIe uplink modules. The data transmission in the form of video will be shown between these boards by exposing the uplink module interface to the FPGA Processor System.


MAC protocol in FPGA 

(by Rakesh and Shareefa)





Demonstration of data communication between Processor Section (PS) to Programmable Logic (PL) in FPGA. This is done as a part of the MAC protocol of the Li-Fi link.



August 5, 2021
9:30 am - 4:00 pm
Event Category: