Provided is a device, which is a transmission device that can improve performance, that includes: a light source; and a transmitter that generates a modulated signal based on an input signal and transmits the modulated signal from the light source as visible light by changing a luminance of the light source in accordance with the modulated signal. The transmitter includes, in the modulated signal, a plurality of items of information related to service set identifiers (SSIDs) of a plurality of mutually different access points in a wireless local area network (LAN), and transmits the modulated signal from the light source.

An optical routing system for free space optical communication is disclosed. The system has a transmitter and a receiver that use free space optical communication, and includes an optical path based on waveguide where an optical signal is routed from the proximity of the transmitter to the proximity of the destination. This system has advantages in terms of mitigating line-of-sight issues, as well as potentially reducing the overall coupling loss that would be otherwise incurred due to beam divergence of free space propagation for long distance.

A system operative to replicate an exact frequency match among multiple signals associated with spatial multiplexing. The system includes twisted pairs and a converter configured to receive multiple input signals, in which each of the input signals is an orthogonal frequency division multiplexing signal comprising multiple sub-carriers, and in which input signals are associated respectively with multiple streams generated in conjunction with spatial multiplexing. The converter utilizes a reference signal, associated with an original conversion signal(s) used outside the converter to establish respective frequency ranges associated with the input signals, to reproduce the original conversion signal(s) as respective replica conversion signal(s). The replica conversion signal(s) are used to respectively convert the input signals into output signals all occupying a same single frequency range such that the sub-carriers of each output signal exactly match in frequency, thus enabling wireless transmission and successful decoding of output signals in conjunction with spatial multiplexing.

A coordination node can be configured to control communications between Visible Light Communication, VLC, Access Points, APs, and user equipments, UEs. The coordination node can: identify occurrence of an event relating to operation of a first VLC AP; determine that a second VLC AP and a third VLC AP each have communication coverage areas that are at least partially within a communication coverage area of the first VLC AP; control the second VLC AP to avoid it interfering with communications between the first VLC AP and a UE while it is within a common communication coverage area of the first VLC AP and the second VLC AP; and control the third VLC AP to avoid it interfering with communications between the first VLC AP and the UE while it is within a common communication coverage area of the first VLC AP and the second VLC AP.

Adaptive communications focal plane arrays that may be implemented in, e.g., a specially-configured camera that can be utilized to receive and/or process information in the form of optical beams are presented. A specialized focal plane array (FPA) having a plurality of optical detectors is utilized, where one or more optical detectors are suppressed such that data is not allowed to be output from the one or more suppressed optical detectors, and only a significantly smaller number or subset of optical detectors receiving optical beams are allowed to output data. In this way, the rate at which data is to be output by an adaptive communications FPA (ACFPA) can be significantly reduced.

A system with which any abnormality can easily be found is provided. A system includes: a first modulator that generates a control signal and modulates an input signal in accordance with the generated control signal, to control luminance of a first light source that emits light according to the modulated input signal, the first modulator outputting the control signal; and a second modulator that acquires a control signal output from the first modulator and modulates an input signal in accordance with the control signal, to control luminance of a second light source that emits light according to the modulated input signal. The first modulator generates, as an extinguishing signal, the control signal for extinguishing the first light source by an extinguishing period. After a lapse of the extinguishing period, the first modulator generates, as a light ID signal, the control signal for transmitting a visible light signal by luminance variations of the first light source.

A system with which any abnormality can be easily found is provided. A system includes: a first modulator that generates a control signal and modulates an input signal in accordance with the generated control signal, to control luminance of a first light source that emits light according to the modulated input signal, the first modulator outputting the control signal; a second modulator that acquires the control signal output from the first modulator and modulates an input signal in accordance with the control signal, to control luminance of a second light source that emits light according to the modulated input signal, the second modulator outputting the control signal. The first modulator generates, as a light ID signal, a control signal for transmitting a visible light signal by luminance variations of the first light source, and acquires a light information signal being the control signal output from the second modulator.

A lighting system includes lighting devices and a controller. An Over-The-Air (OTA) update of lighting device programming is delivered via point-to-point connections between the controller and some number of lighting devices and/or between the lighting devices. Delivery of the OTA update from one lighting device to another lighting device is triggered based on an update command sent via a wireless mesh network of the lighting system.

A LiFi system having multiple transceivers (11) and a single multiple-input- multiple-output (MIMO) modem (41) with at least M outputs, wherein the M transmit outputs of the MIMO modem (41) are fed to a linear combiner (42). The linear combiner creates M distinct linear combinations based on the N MIMO transmit branch signals of the MIMO modem and the linear combinations are chosen such that they allow decoding of each of the5 N MIMO transmit branch signals when N of the M distinct output signals are received.

This invention relates to an interference handling method and system for an optical wireless communication system, wherein multiple levels and operating modes are provided to flexibly handle partitioning of a coordination functionality between a central entity and distributed entities. Thereby, the coordination functionality which relies on interference reports from devices in overlapping coverage areas of access points can be central or distributed over access points or partly central and partly distributed.