These commercial opportunities in Li-Fi highlight the various licensing opportunities and technology platforms that are currently available.
These licensing opportunities are currently available from the University of Edinburgh for potential industry partners seeking to license Li-Fi technologies:
This Li-Fi technology offers a new transmission medium for high speed communications, significantly increasing the data rate capacity of optical wireless communication, while re-using LED lighting infrastructure as the transmission channel.
This Edinburgh technology has the ability to convert a signal transmitted over an LED based communication link from a bipolar signal into a unipolar signal. By applying a pulse shaping filter to the bipolar signal, and then transforming the negative values of the pulse shaped bipolar signal into a unipolar signal, the net effect is a significant enhancement in data rate transmission. The method can be readily integrated into LED lighting infrastructure, using low cost front end devices to implement a range of Li-Fi applications.
This Li-Fi technology combines spectral efficiency with power efficiency and allows very high speed data communications to be reliably achieved using LED lighting infrastructure as the transmission channel.
A special configuration and encoding algorithm is applied to data frames occupying a single frequency band, before simultaneously transmitting the frames over a visible light communication link, and successfully separating them again at the transmitter by use of symmetry properties in the decoder. The novel method applies to any intensity modulated transmission medium where direct detection is employed, and acts to reduce the effects of inter-symbol interference and to increase spectral efficiency.
Li-Fi Research and Development Centre platform designs
UP-VLC transmitter driver chip
A custom-designed transmitter driver chip, implemented in an Austria Micro Systems 0.18 µm CMOS process. The chip consists of 4 independent digital-to-analogue converters (DACs), each capable of directly driving an individual light emitting diode (LED) and having its own 8-bit LVDS digital data interface. The chip also comes with an internal buffer/de-serializer to support ganging/MIMO operation. A serial LVDS interface is provided for chip configuration. An n-channel metal-oxide semiconductor (NMOS) transistor based circuitry is used to realize the driver functionality due to the better carrier mobility and lower area requirement compared with p-channel MOS (pMOS) transistors. Each driver can sink an LED drive current of up to 255 mA, and is designed to operate at a bandwidth of up to 250 MHz.
UP-VLC receiver chip
A custom-designed receiver chip, implemented in a 0.18 µm CMOS process and featuring nine individually-addressable avalanche photo diode (APD) receivers. Each photo diode (PD) can be operated as a regular PIN diode or in avalanche mode. The maximum reverse bias necessary for the avalanche mode is 12 V, which is significantly lower than other APD technologies. The measured receiver sensitivity is around 2.5 A/W – so comparable to standard off-the-shelf APDs. Each PD is paired with an on-chip shunt-feedback transimpedance amplifier (TIA). As a result, the overall configuration is able to support up to nine individual receiver channels operating at up to 250 MHz of analogue bandwidth.
Li-Fi front-end platform
A custom designed platform on a single PCB, able to support a range of Li-Fi analogue front-end components and to form the basis of Li-Fi demonstration systems and tranceivers. The board features an FPGA chip, Ethernet connectivity, an analogue-to-digital converter (ADC), a digital-to-analogue converter (DAC), and expansion connectors. It includes a custom designed digital signal processing (DSP) chip developed in the course of the University of Edinburgh ‘PASTA2’ project, as well as a transmitter driver chip developed in the ‘UP-VLC’ programme. The platform supports communication speeds in the range from several hundred Megabit per second, up to a Gigabit per second.
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For more information on the Li-Fi R&D Centre technology platforms, please contact us.
Other technology platforms from partners
The following Li-Fi technology platforms are currently available from Li-Fi R&D Centre partners.
The Li-1st provides the first major opportunity for customers to rapidly develop and test VLC applications for cost-effective, high-speed data communication solutions that utilize commercial light emitting diode (LED) infrastructures. The product offers full duplex communication with a capacity of 5Mbps in both the downlink and uplink over a range of up to three metres, while simultaneously providing ample desk space illumination.
The Li-Fire platform will enable the world’s first ubiquitous high-speed wireless network solution using VLC. Li-Fire technology will deliver data densities substantially greater than state-of-the-art Wi-Fi solutions and its inherent security properties will eliminate unwanted external network intrusion. In addition, the merger of illumination with wireless communications will provide a measurable reduction in both infrastructure complexity and energy consumption.