Abstract: The invention is directed to electrical load grouping based on measurements of an electrical parameter at electrical load sensors (120A, 120B). An electrical load grouping device (110) is configured for receiving a changed value of the electrical parameter from one or more of the electrical load sensors (120A, 120B) in reaction to a changed power consumption of a respective electrical load (132A, . . . , 134C). The electrical load grouping device (110) is further configured for assigning the respective electrical load (132A, . . . , 134C) to a group (130A, 130B) of electrical loads associated to an electrical load sensor (120A, 120B) or groups of electrical loads associated to electrical load sensors based on which electrical load sensor (120A, 120B) or which electrical load sensors measured the changed value of the electrical parameter received in reaction to the changed power consumption of the respective electrical load (132A, . . . , 134C).

Abstract: A control system is provided for an optical wireless communications system comprising a plurality of optical communications access points, APs, (102) which have a combined field of view which defines a coverage area, wherein the APs are for communicating with end devices, EDs, (204) over a communications medium of an optical wireless local area network. At least one ED is movable through the coverage area and thereby is in communications range of different APs along a path through the coverage area. The controller obtains a topology of a movable area, wherein the movable area is defined by the physical space through which a movable ED may move. An AP is identified which has a movable ED in its field of view (210), and then a first sub-set of the APs is activated which are determined as possibly being next along the path through the movable area from the identified AP. A second subset of the APs are determined not to be next along the path through the movable area.

Abstract: An Optical Wireless Communication, OWC, front end (300) comprises a reflective splitter (310). The reflective splitter (310) has a controller port (311) for optical coupling to a controller (200) which generates OWC signals, and the reflective splitter (310) has a plurality of user ports (312) for optical coupling to OWC endpoint devices (400). The reflective splitter (310) is constructed and arranged such that: light received at the controller port (311) is passed to one or more of the user ports (312) for transmission to one or more OWC endpoint devices (400) in optical wireless communication with that user port (312); and light received at any of the user ports (312a) is passed to at least one other of the user ports (312b, 312c) for transmission to one or more OWC endpoint devices (400) in optical wireless communication with that user port (312b, 312c).

Abstract: The invention relates to a laser element module comprising a first laser module comprising a first laser element and a first capacitor, wherein the first laser element is coupled in series with the first capacitor; a second laser module comprising a second laser element and a second capacitor, wherein the second laser element is coupled in series with the second capacitor, wherein the first laser module is coupled in series with the second laser module; a bias current source adapted to provide a first bias current to the first laser element and a second bias current to the second laser element; a modulation current source adapted to provide an alternating current to the first capacitor, wherein the bias current source and the modulation current source, when active, are arranged to provide a total current to the first laser element and the second laser element which is always larger than a lasing current threshold of the first laser element and a lasing current threshold of the second laser element.

Abstract: An optical communications access point, AP (AP), is provided, and a system combining the AP and additional stations, STAs, (STA1, STA2) which are in communications range of the AP over a communications medium of an optical wireless local area network. The AP is arranged to, before sending downlink poll messages, send an invite to poll message inviting STAs (STA1, STA2) to send a request to poll message within an invite-to-poll time window. The AP (AP) then sends a downlink poll message to a first identified STA (STA1) having requested a poll, thereby allowing a return uplink transmission for a predetermined duration to be initiated by the first STA (STA1) after receiving the first downlink poll message. The first downlink poll message prohibits other STAs, (STA2) receiving the first downlink poll message, from accessing the communications medium during said predetermined duration after the first downlink poll message.

Abstract: This invention relates to an optical wireless communication (OWC) system that is configured to make use of observations of straylight reflections as generated by an OWC transmitter in order to support contention-based channel access including that of multiple basic or extended service sets (BSS, ESS) with overlapping coverage areas. It is proposed to have an additional optical signal or signal component generated in the OWC transmitter which allows for simple detection without having to do heavy digital demodulation processing. A learning phase may allow to adjust for environmental conditions like reflectivity or transmitter characteristics.

Abstract: A system comprises a battery, a load and a power converter for converting battery power from the battery into load power for application to the load. A system controller enables selection between a continuous discharge mode and a discontinuous discharge mode of the battery. In this way, the battery can be operated in different ways according to the most appropriate battery discharge characteristics.

Abstract: The invention relates to an incorporation of a current limiting/regulating circuit on a luminaire board for ensuring that the luminaire board will automatically operate at its desired current after a replacement. Since the current control at the luminaire board causes an initial mismatch between the current supply of the driver and the demand of the luminaire board, the driver output voltage will drift towards the maximum output voltage of the driver. When the maximum output voltage is reached, the driver is configured to operate in constant-voltage (CV) mode, sense the output current and reduce its output current to the same value as consumed by current-controlled luminaire board. Alternatively, the driver may gradually reduce the setpoint of the output current until it just leaves the CV mode and stay at that setpoint. In this way, the driver will automatically operate at the correct current of a newly installed luminaire board without any action from the user.

Abstract: The invention relates to a signal-repeater device (308) being operable in a regular repeater-operation mode and in a low-power repeater-operation mode requiring less operational power than the regular repeater-operation mode, and that comprises a signal processing unit (316) which performs, in the regular repeater-operation mode, a signal receiving function and a signal repeating function, and an operation control unit (318) configured to determine status information indicative of associated external transceiver devices being respectively operated in a low-power transceiver-operation mode, operate the signal processing unit in the low-power repeater-operation mode by switching off the signal repeating function upon determining, based on the determined status information, that each of the associated external wireless transceiver devices is being operated in the low-power transceiver-operation, thus reducing the power consumption of the signal-repeater device, and switch to operation of the signal processing un

Abstract: A lighting arrangement has a lighting module with a sensor element in parallel with a light source arrangement between module terminals. A measuring system is provided for measuring, at the module terminals, a signal which is dependent on the sensor element when the light source arrangement is turned off. Thus, sensing is integrated into or connected to a lighting module, such as LED module.

Abstract: A lighting circuit comprises a first light source arrangement and a second light source arrangement, of different types, in series. A driver delivers a controllable current to the light source circuit, with an adjustable DC component and an adjustable modulated component, for example an adjustable duty cycle of a superposed pulse width modulated component. This enables control of the contributions to the overall light output flux from the different types of light source.

Abstract: The invention relates to a DC-power supply device (400) for supplying operational DC-power to one or more DC-powered devices that have respective DC-power requirements, that comprises a power interface (402) for providing, via a single twisted-pair wired bus (401), DC output power, a DC-power-supply network communication unit (404) configured to receive DC-power requirement information indicative of a DC-voltage requirement and a DC-current requirement for operation of the respective connected DC-powered devices, and a DC-power-supply control unit (406) configured to drive, in an initialization supply mode, delivery of initialization DC-output power amount, that is suitable for transmission by the DC-powered devices of respective DC-power requirement information, to determine, using the DC-power requirement information and a power-determination rule, and provide an operational DC output power for powering operation of at least one the DC-powered devices in its regular operation mode, thus enabling a powering

Abstract: According to one aspect disclosed herein, there is provided a client device for use in an optical wireless communications network, the client device comprising a transceiver configured to receive data via an optical wireless connection. The transceiver comprises an upward facing optical transducer configured to detect or transmit an optical wireless transmission, the sensor arranged to have a coverage area with at least two 5 concentric segments. A portion of the sensor is configured to provide an outermost segment of the at least two concentric segments.

Abstract: A method (500) for facilitating adaptive bit loading in a transmitter (200) of a multi-carrier communication system (100) comprising a plurality of subcarriers, the method (500) comprising the transmitter (200) performing the steps of: determining (S501) an adaptive bit loading profile; wherein the adaptive bit loading profile defines for each one out of the plurality of subcarriers a corresponding constellation, and more than one constellation are to be used by the plurality of subcarriers; determining (S502) a size of an interleaving template table according to the highest order constellation of the determined adaptive bit loading profile; preparing (S503) data blocks by filling in data bits of an encoded data stream to the interleaving template table according to a predefined pre-processing pattern; wherein the predefined pre-processing pattern defines whether a cell in the interleaving template table is to be filled in either by a data bit of the encoded data stream or a dummy bit; carrying out (S504) an

Abstract: The present invention relates to fast start-up of powered devices (22) connected to a power sourcing equipment (10?) in a Power over Ethernet system (100). A stored voltage-current profile of an initial powering phase of a powered device (22) is provided. A voltage level provided to the powered device (22) in a subsequent initial powering phase of the powered device (22) is adjusted as long as a value corresponding to a current voltage level of a voltage-current profile of the subsequent initial powering phase deviates less than a predetermined threshold level from its corresponding value of the stored voltage-current profile of the initial powering phase of the powered device (22) and until a predetermined voltage level is reached. This can allow detecting whether a previously connected powered device (22) was replaced by another powered device (22) and to immediately start-up an unchanged powered device (22) with previously used operation parameters.

Abstract: An antenna arrangement is disclosed. The antenna arrangement comprises: an elongated pipe shaped electrically conductive body; a plurality of slots formed in the conductive body and arranged to act as an antenna array comprising a plurality of antenna elements, each antenna element comprising a slot, the plurality of antenna elements of the antenna array overall distributed along a longitudinal direction of the conductive body, and a feeding structure disposed within the conductive body, the feeding structure comprising a plurality of feeding elements each arranged to excite an antenna element of the antenna array.

Abstract: A laser circuit has a current source for delivering current to a laser device. A pulse width modulation laser drive current is used, and the amplitude and duty cycle of the laser drive current is set in dependence on an estimated junction temperature. In this way efficiency may be kept high for different operating temperatures and a desired optical output power.

Abstract: A communications module comprises a sleeve for extending around a portion of a street light. An antenna circuit is integrated into the sleeve and comprises an array of antennas for implementing communication with user mobile devices in the vicinity of the street light.

Abstract: A system (100) comprising one or more light sources (110) for illumination; an array of active antennas (120) configured to detect contextual information; and a controller (130) configured to obtain the contextual information from the array of active antenna; and control the one or more light sources based on the contextual information; wherein the array of active antennas (120) is shared with a co-located MIMO communication system, and the contextual information is related to one or more objects in an illumination area covered by the one or more light sources (110).

Abstract: A lighting circuit comprises a current driver circuit and a series connection of at least two laser diodes, supplied with current from the current driver circuit. A current shunt circuit is in parallel with each laser diode for diverting a shunt current away from the respective laser diode. The level of the shunt currents is controlled during a start-up period of time of the current driver circuit in order to control the rate of change of voltage across selected laser diodes during said start-up period of time.