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Design and implement a high-speed, line-of-sight Light Fidelity (LiFi) communication system that is compliant with ITU-T G.9991 and G.9960 standards. The system must utilize a Laser Diode for optical data transmission and a Photo Diode for reception. The complete system should be built around Raspberry Pi (RPi) platforms, such that one RPi transmits Ethernet data via LiFi and another RPi receives it and outputs it back through Ethernet. The solution should include hardware interfacing, embedded code, and real-time data transmission capabilities.

LiFi is an emerging wireless communication technology that offers high data rates using visible or infrared light instead of traditional radio waves. ITU-T G.9991 and G.9960 standards define physical and data link layer specifications for optical wireless communications, ensuring interoperability and performance benchmarks. The need for secure, interference-free, and high-throughput short-range communication systems motivates the development of this LiFi prototype. Raspberry Pi-based implementation enables low-cost deployment, rapid prototyping, and integration with existing Ethernet-based infrastructure, making this system suitable for smart environments, IoT networks, or secure indoor communication.

The system should consist of two main units:

Transmitter Unit (RPi1-based):

· Accepts Ethernet data input.

· Processes and encodes the data in compliance with ITU-T G.9991/G.9960.

· Transmits data using a Laser Diode through LiFi.

· May require custom driver circuitry and signal modulation hardware.

Receiver Unit (RPi2-based):

· Receives LiFi signal via Photo Diode.

· Decodes and processes the data.

· Outputs the recovered data via Ethernet.

· May include signal conditioning, demodulation, and synchronization logic.

Scope includes:

· Implementing physical layer modulation compatible with ITU-T G.9991 (e.g., OOK, PAM).

· Timing synchronization and error correction as per ITU-T G.9960 MAC layer.

· Design and fabrication of interface hardware (signal amplification, ADC/DAC if needed).

Developing low-level and high-level software for RPi to handle data I/O and optical signalling.

Functional Prototype:
A working LiFi system using RPi units and custom hardware to support real-time Ethernet-to-Ethernet communication over a laser-based optical link.

Hardware Designs:
Schematic and PCB design files of the interfacing board connecting the Laser Diode and Photo Diode to Raspberry Pi GPIO or SPI/I2C/UART interfaces.

Firmware and Software:
Source code running on the RPi, implementing ITU-T compliant modulation/demodulation and data handling.

Documentation:

· System architecture and design report.

· Setup and deployment instructions.

· Performance metrics (data rate, error rate, range, latency).

Demonstration:
A test scenario showing successful transmission of a file or streaming data (e.g., video, text) from RPi1 to RPi2 over the optical LiFi link.

Interested Startup may submit the pitch deck comprising of following:

• Problem being solved

• Market opportunity for product

• Proposed solution/ Defining product

• Value proposition

• Technology details

• Competition analysis

• Founding Team Composition

• DPIIT Registration (Mandatory)

• Start-up stage status

• Current ownership

• Business model and innovation