Abstract: An optical wireless communication (OWC) system comprises: an access point (AP) comprising a plurality of OWC transmitters and a plurality of OWC receivers; a station (STA) comprising at least one retroreflector; and a controller configured to control the OWC AP transmitters and/or OWC AP receivers; wherein the controller is configured to process data representative of at least one OWC signal that is received by at least one of the OWC AP receivers after having been transmitted by at least one of the OWC AP transmitters and reflected by the at least one retroreflector; and the controller is configured to activate and/or deactivate at least one of the OWC AP transmitters and/or OWC AP receivers based on the processing of the data that is representative of the received at least one OWC signal.

Abstract: An optical wireless communication (OWC) unit for transmitting and/or receiving data installable in a further device comprises at least one transmitter device for transmitting modulated light comprising an OWC signal of said data and/or at least one receiver device for receiving modulated light comprising an OWC signal representative of said data, wherein the at least one receiver device comprises at least one detector. The OWC unit further comprises analogue electronic circuitry for processing electronic signals and at least one power connection and/or at least one data connection for connection to a power source and/or processing resource of the further device. The OWC unit is operable to provide OWC communication under control of said further device and/or so as to transmit data from/provide data to said further device. The OWC unit is for use in an OWC system having an analogue bandwidth greater than or equal to 80 MHz.

Abstract: A display apparatus comprises an at least partially transparent display, the display configured to generate light to form an image for display to a user positioned in front of the display, and at least one light-transmitting and/or light-receiving device positioned behind the display, wherein the at least one light-transmitting and/or light-receiving device is configured to transmit and/or receive light through at least part of the display, wherein the at least one light-transmitting and/or light-receiving device comprises or forms part of an optical wireless communications (OWC) apparatus configured to transmit and/or receive the light through the at least part of the display.

Abstract: An optical wireless communication (OWC) system comprises: an access point (AP) comprising a plurality of OWC transmitters and a plurality of OWC receivers; a station (STA) comprising at least one retroreflector; and a controller configured to control the OWC AP transmitters and/or OWC AP receivers; wherein the controller is configured to process data representative of at least one OWC signal that is received by at least one of the OWC AP receivers after having been transmitted by at least one of the OWC AP transmitters and reflected by the at least one retroreflector; and the controller is configured to activate and/or deactivate at least one of the OWC AP transmitters and/or OWC AP receivers based on the processing of the data that is representative of the received at least one OWC signal.

Abstract: An optical wireless communication (OWC) system comprises an OWC network and a further OWC network. The OWC network comprises a primary OWC apparatus configured for connection to an electronic network and one or more secondary OWC apparatuses, each secondary OWC apparatus configured for incorporation into, or connection to, or comprising, a corresponding user device. The further OWC network comprises a further primary OWC apparatus configured for connection to a further electronic network and one or more further secondary OWC apparatuses, each further secondary OWC apparatus configured for incorporation into, or connection to, a corresponding user device. The primary OWC apparatus and each of the one or more secondary OWC apparatuses are configured for communication of one or more OWC signals therebetween on one or more optical wavelengths, each OWC signal comprising corresponding data and a corresponding identifier code.

Abstract: An optical wireless communication (OWC) transceiver apparatus includes at least one light transmitter configured to transmit light of a first wavelength or first range of wavelengths, driver circuitry configured to receive a data signal and to process the data signal to produce a driving signal to drive the at least one light transmitter such that the at least one light transmitter produces a modulated optical signal representative of said data signal, at least one photodetector configured to receive light of a second wavelength or second range of wavelengths and to produce a detection signal in response to the received light, receiver circuitry configured to receive and process the detection signal to produce a receiver signal, and demodulation circuitry configured to perform a decoding and/or demodulation process in accordance with an OWC protocol thereby to extract data from the receiver signal.

Abstract: An optical wireless communication system and method An optical wireless communication (OWC) system comprises: a multiple input multiple output (MIMO) device configured to provide a plurality of signals each representing a respective data stream; conditioning circuitry configured to receive the plurality of signals from the MIMO device and process the plurality of signals to produce at least one conditioned signal representative of the data stream(s) and suitable for transmission using an OWC transmission device; an OWC transmission device comprising at least one transmitter for transmitting light and configured to be responsive to the at least one conditioned signal to transmit light representative of the data stream(s) using the at least one transmitter.

Abstract: An optical wireless communications receiver for a portable communications device, the receiver being configured to receive radiation signals on which communication data is encoded, wherein the receiver is comprised in or on or configured for mounting to at least part of a periphery or edge of the device. Advantageously, the optical wireless communications comprises a plurality of, receiver elements distributed along or around the receiver and/or comprises an optical guide configured to receive radiation and convey at least part of the radiation along the optical guide to at least one of the receiver elements.

Abstract: A camera for capturing an image comprising: an image sensor configured to generate image sensor data in response to received light; a processing resource configured to process the image sensor data to obtain image data and communication data, wherein obtaining the communication data comprises performing a demodulation process in respect of at least part of the image sensor data, wherein the processing resource is further configured to transmit the communication data and the image data to at least one further processing resource.

Abstract: A display apparatus comprises an at least partially transparent display, the display configured to generate light to form an image for display to a user positioned in front of the display, and at least one light-transmitting and/or light-receiving device positioned behind the display, wherein the at least one light-transmitting and/or light-receiving device is configured to transmit and/or receive light through at least part of the display, wherein the at least one light-transmitting and/or light-receiving device comprises or forms part of an optical wireless communications (OWC) apparatus configured to transmit and/or receive the light through the at least part of the display.

Abstract: An optical wireless communication (OWC) device comprises: a receiver comprising: a dual-wavelength filter configured to filter light arriving at the receiver, wherein the dual-wavelength filter is configured to pass light of a first frequency and light of a second, different frequency, and wherein the dual-wavelength filter is configured to substantially block light of a third frequency between the first frequency and second frequency; and a photodetector configured to receive the filtered light and to sense modulated light of the first frequency and/or modulated light of the second frequency to produce at least one receiver signal; demodulation circuitry and a processing resource for performing a demodulation and processing with respect to the at least one receiver signal to obtain data encoded in the modulated light of the first frequency and/or data encoded in the modulated light of the second frequency; a transmitter comprising a light source configured to output modulated light of the third frequency; a

Abstract: An optical wireless communications receiver for a portable communications device, the receiver being configured to receive radiation signals on which communication data is encoded, wherein the receiver is comprised in or on or configured for mounting to at least part of a periphery or edge of the device. Advantageously, the optical wireless communications comprises a plurality of, receiver elements distributed along or around the receiver and/or comprises an optical guide configured to receive radiation and convey at least part of the radiation along the optical guide to at least one of the receiver elements.

Abstract: A display apparatus comprises an at least partially transparent display, the display configured to generate light to form an image for display to a user positioned in front of the display, and at least one light-transmitting and/or light-receiving device positioned behind the display, wherein the at least one light-transmitting and/or light-receiving device is configured to transmit and/or receive light through at least part of the display, wherein the at least one light-transmitting and/or light-receiving device comprises or forms part of an optical wireless communications (OWC) apparatus configured to transmit and/or receive the light through the at least part of the display.

Abstract: An optical wireless communication (OWC) interface apparatus comprises: at least one input and/or output configured to transfer data signals from and/or to a bus device; optical interface circuitry configured to transfer optical wireless communication (OWC) signals representative of the data signals between the OWC interface apparatus and a light transmitter and/or receiver apparatus, wherein the light transmitter and/or receiver apparatus is configured to transmit and/or receive the OWC signals as free-space light signals; and interface control circuitry that is configured to establish and/or maintain communication with the bus device in accordance with a bus protocol thereby to enable transfer of the data signals between the OWC interface apparatus and the bus device.

Abstract: An optical wireless communication device comprises: at least one of a transmitter and a receiver configured to transmit and/or receive light comprising an optical wireless communication signal representing data; at least one adjustable shutter element associated with the at least one of a transmitter and a receiver, wherein the at least one adjustable shutter element and the associated at least one of the transmitter and the receiver are adjustable between a first configuration and a second configuration such that in the first configuration the at least one adjustable shutter element is configured to at least partially block or partially redirect light having a first selected property and at least partially allow light having a second selected property to pass through unaffected such that transmission and/or reception of the optical wireless communication signal by the at least one of the transmitter and the receiver is substantially altered.

Abstract: An optical wireless communication (OWC) system comprising a first device comprising a transceiver apparatus and a plurality of further devices each comprising a respective further transceiver apparatus. The first device communicates via an optical channel with the plurality of further devices.

Abstract: An optical wireless communication system comprises: a first device comprising a transceiver apparatus; and a plurality of further devices each comprising respective further transceiver apparatus, wherein the first device is configured to communicate via at least one optical channel with the plurality of further devices, and the transceiver apparatus of the first device comprising: a receiver for receiving light (optionally of a first wavelength or range of wavelengths) representing optical wireless communication signals transmitted by the further devices, the receiver comprising at least one photodetector; receiver-side processing circuitry for processing optical wireless communication signals received by the receiver to extract data represented by the received optical wireless communication signals; a transmitter for transmitting further light (optionally of a second wavelength or range of wavelengths)s representing optical wireless communication signals; transmitter-side processing circuitry for producing o

Abstract: A method for connecting a wireless communication station (STA) with a selected one of a plurality of access points (APs) are described. At least some of the APs are initially substantially unsynchronized in time. The method includes transmitting, by the STA, a beacon request signal via an uplink channel, performing, by the APs and in response to the beacon request signal, a synchronization procedure, the synchronization procedure comprising transmitting, by each of the APs, a respective beacon signal via at least one downlink channel, such that the beacon signals from the plurality of APs are substantially synchronized in time, receiving, by the STA, the beacon signals from the plurality of APs, selecting, by the STA, one of the plurality of APs in dependence on at least one property of the beacon signals, and associating the STA with the selected one of plurality of APs. Related systems and devices are described.

Abstract: An optical wireless communication device for transmitting data comprises a transmitter comprising a light source, a controller configured to control operation of the light source to produce modulated light comprising an optical wireless communication signal representative of said data, at least one proximity determining component configured to determine a proximity of an object, and a processing resource configured to determine whether the determined proximity is within a threshold distance, wherein the controller is configured to control operation of the transmitter and/or of at least one other component of the optical wireless communication device in dependence on whether the determined proximity is within the threshold distance.

Abstract: An optical wireless communication (OWC) transceiver apparatus comprises: at least one light transmitter configured to transmit light of a first wavelength or first range of wavelengths; driver circuitry configured to receive a data signal and to process the data signal to produce a driving signal to drive the at least one light transmitter such that the at least one light transmitter produces a modulated optical signal representative of said data signal; at least one photodetector configured to receive light of a second wavelength or second range of wavelengths and to produce a detection signal in response to the received light; receiver circuitry configured to receive and process the detection signal to produce a receiver signal; demodulation circuitry configured to perform a decoding and/or demodulation process in accordance with an OWC protocol thereby to extract data from the receiver signal; wherein the transceiver apparatus further comprises: a motion sensor configured to sense motion of at least one ob