Implementation

The architecture of a LiFi system consists of two parts: an LED luminaire with a built-in modem that modulates the light and a LiFi USB key/dongle plugged into the socket of a laptop or tablet. The ability to perform signal modulation is key to any LiFi-enabled luminaire. The modem which is a digital signal processor integrated or attached to an LED driver transforms streaming content provided by a server over the Internet into digital signals. The DSP comes with a digital-to-analogue converter (DAC) which converts data into bytes. A transmitter module thereafter generates the corresponding on-off pattern and instructs the LED driver to provide high frequency switching operation. The LiFi dongle acts as a data receiver and data transmitter. It generally comprises a photodetector, a signal amplifier, a data processing circuitry, and an uplink module.