Garmin Switzerland Gmbh

Sunpartner Technologies

Emilie Bialic

Franck Aveline

Nicolas Chaumont

Sylvain De Vecchi

Brice Arrazat

The invention relates to a bidirectional wireless communication device which is based on the use of light, including emitting modules, each emitting amplitude- and/or phase-modulated light; and a receiving module made up of: a photodetector illuminated by said modulated light and generating a modulated electrical signal in response to said modulated light; and a processing module for processing the signal generated by said photodetector. The receiving module includes an electronic means positioned between the photodetector and the signal-processing module and capable of matching the impedance of the photodetector to maximise the signal-to-noise ratio of the electrical signal by minimising distortions of said electronic signal associated with incorrect impedance matching at the output of the photodetector, while maximising the level of the modulated electrical signal and the throughput of transmitted data.

Electronic device associated with a photovoltaic module to optimise the throughput of a bidirectional VLC transmission

A coded-light communication device is described, in which the communication has an initial signal-to-noise ratio, which varies according to the lighting conditions. The device comprises at least one photodetector-type light receiver comprising an anode and a cathode and having an initial shunt resistance. The receiver is capable of being simultaneously exposed to a coded light source carrying a signal and a non-coded light source. The anode and cathode are short-circuited by at least one short-circuit resistance arranged inside the photodetector, having a value selected so that the new value of the shunt resistance of the photodetector resulting from the connection of the initial shunt resistance and the short-circuit resistance gives the communication device a new resultant signal-to-noise ratio which remains substantially independent of the intensity of the non-coded light.

Photovoltaic receiver optimised for communication by coded light

The invention relates to a wireless communication device which uses light, comprising at least: a light source emitting a modulated light signal; a photovoltaic module capable of receiving said modulated light signal; and an analog-to-digital converter electrically connected to the output terminals of said photovoltaic module, making it possible to convert the analog signal output by the photovoltaic module into a digital signal; characterised in that it also comprises a means for polarising said photovoltaic module making it possible to generate a polarisation voltage applied to the terminals of said photovoltaic module, and a management module capable of optimising said polarisation voltage into a threshold voltage corresponding to an improved signal-to-noise ratio and communication bandwidth.

Photovoltaic receiver device with polarization management in order to increase the rate of an optical communication

The invention relates to a bidirectional wireless communication device which is based on the use of light, including emitting modules, each emitting amplitude- and/or phase-modulated light; and a receiving module made up of: a photodetector illuminated by said modulated light and generating a modulated electrical signal in response to said modulated light; and a processing module for processing the signal generated by said photodetector. The receiving module includes an electronic means positioned between the photodetector and the signal-processing module and capable of matching the impedance of the photodetector to maximize the signal-to-noise ratio of the electrical signal by minimizing distortions of said electronic signal associated with incorrect impedance matching at the output of the photodetector, while maximizing the level of the modulated electrical signal and the throughput of transmitted data.

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Rousset, France

Emilie Bialic