Abstract: A system and method for communication of digital data includes receiving a plurality of data bits to be transmitted, and generating an output signal for transmission by a transmitter circuit. The generating includes generating a portion of the output signal comprising values of the output signal with magnitude less than a specified threshold, the specified threshold corresponding to a specified transmitter circuit maximum output power; and generating a portion of the output signal comprising a representation of values of the output signal with magnitude greater than the specified threshold.

Abstract: A positioning system and method includes a transmitter, a receiver, and a controller. The transmitter includes at least one energy source configured to emit an optical or quasi-optical electromagnetic signal as a channel communication. The receiver includes at least one detector element configured to receive the channel communication. The controller is connected to the receiver and configured to estimate a position of the transmitter within a space using a reference map of the space and one or more diffuse components of an impulse response of the channel communication.

Abstract: A system and method for providing optical multiple input and multiple output data communication using optical signals includes a plurality of light sources, a plurality of photodetectors, and at least one controller. The plurality of light sources are configured to emit optical signals to communicate data. The plurality of photodetectors are configured to sense the optical signals, and are embedded in at least one receiver. At least one of the plurality of photodetectors is configured to receive the optical signals from two or more of the plurality of light sources. The controller is configured to assign a transmit power to at least some of the plurality of light sources based on parameters of the plurality of photodetectors.

Abstract: A system and method for communication of digital data includes receiving a plurality of data bits to be transmitted, and generating an output signal for transmission by a transmitter circuit. The generating includes generating a portion of the output signal comprising values of the output signal with magnitude less than a specified threshold, the specified threshold corresponding to a specified transmitter circuit maximum output power; and generating a portion of the output signal comprising a representation of values of the output signal with magnitude greater than the specified threshold.

Abstract: A positioning system and method includes a transmitter, a receiver, and a controller. The transmitter includes at least one energy source configured to emit an optical or quasi-optical electromagnetic signal as a channel communication. The receiver includes at least one detector element configured to receive the channel communication. The controller is connected to the receiver and configured to estimate a position of the transmitter within a space using a reference map of the space and one or more diffuse components of an impulse response of the channel communication.

Abstract: A system and method for providing optical multiple input and multiple output data communication using optical signals includes a plurality of light sources, a plurality of photodetectors, and at least one controller. The plurality of light sources are configured to emit optical signals to communicate data. The plurality of photodetectors are configured to sense the optical signals, and are embedded in at least one receiver. At least one of the plurality of photodetectors is configured to receive the optical signals from two or more of the plurality of light sources. The controller is configured to assign a transmit power to at least some of the plurality of light sources based on parameters of the plurality of photodetectors.

Abstract: Optical wireless communication systems configured to provide Hadamard coded information are described. In some examples, the system includes a light fixture configured to encode communication information received from an area network as Hadamard coded information, and provide the Hadamard coded information as a first Hadamard coded modulated optical emission from a light emitting diode. An optical wireless communication device can receive and decode the optical emission and provide the decoded information to an electronic device coupled to the optical wireless communication device.

Abstract: Visible-light communication (VLC) is an optical wireless communication technique that uses light emitting diodes (LEDs) or other optical sources to transmit information to a user equipment (UE) device. An optically-based location determination approach, such as using VLC infrastructure, can meet a desire for location-based services where use of VLC can provide a solution to an indoor localization or navigation problem. A fingerprinting approach can include use of an optical received signal strength (RSS) or other information (e.g., an image of a scene) to generate a spatial fingerprint map of an area. A later-received RSS on the UE device and the prior-generated fingerprint map representative of RSS can be received, and a fingerprint map and RSS observations can be provided as inputs to a Bayesian filter, such as an Extended Kalman Filter (EKF) or a Particle Filter, to provide an estimated position for the UE device.

Abstract: Visible-light communication (VLC) is an optical wireless communication technique that uses light emitting diodes (LEDs) or other optical sources to transmit information to a user equipment (UE) device. An optically-based location determination approach, such as using VLC infrastructure, can meet a desire for location-based services where use of VLC can provide a solution to an indoor localization or navigation problem. A fingerprinting approach can include use of an optical received signal strength (RSS) or other information (e.g., an image of a scene) to generate a spatial fingerprint map of an area. A later-received RSS on the UE device and the prior-generated fingerprint map representative of RSS can be received, and a fingerprint map and RSS observations can be provided as inputs to a Bayesian filter, such as an Extended Kalman Filter (EKF) or a Particle Filter, to provide an estimated position for the UE device.

Abstract: An expurgated pulse position modulation (EPPM) technique can be used to encode information for wireless transmission. Such an EPPM technique can be compatible with a simple receiver architecture, such as including a shift register and pulse position modulation (PPM) decoder. A multi-level EPPM (MEPPM) approach can increase the available symbols in the modulation constellation and can be used to accommodate multiple users or devices concurrently. Interleaving techniques can be used such as to reduce inter-symbol interference. An optical transmitter and an optical receiver can be used, such as including using energy in a visible range of frequencies. In an example, an optical source such as including one or more light emitting diodes can provide visible light for illumination, and the EPPM technique can include using codewords specified to provide a desired dimming level when such codewords are used to intensity modulate the optical source, without perceptible flicker.

Abstract: An expurgated pulse position modulation (EPPM) technique can be used to encode information for wireless transmission. Such an EPPM technique can be compatible with a simple receiver architecture, such as including a shift register and pulse position modulation (PPM) decoder. A multi-level EPPM (MEPPM) approach can increase the available symbols in the modulation constellation and can be used to accommodate multiple users or devices concurrently. Interleaving techniques can be used such as to reduce inter-symbol interference. An optical transmitter and an optical receiver can be used, such as including using energy in a visible range of frequencies. In an example, an optical source such as including one or more light emitting diodes can provide visible light for illumination, and the EPPM technique can include using codewords specified to provide a desired dimming level when such codewords are used to intensity modulate the optical source, without perceptible flicker.

Abstract: An expurgated pulse position modulation (EPPM) technique can be used to encode information for wireless transmission. Such an EPPM technique can be compatible with a simple receiver architecture, such as including a shift register and pulse position modulation (PPM) decoder. A multi-level EPPM (MEPPM) approach can increase the available symbols in the modulation constellation and can be used to accommodate multiple users or devices concurrently. Interleaving techniques can be used such as to reduce inter-symbol interference. An optical transmitter and an optical receiver can be used, such as including using energy in a visible range of frequencies. In an example, an optical source such as including one or more light emitting diodes can provide visible light for illumination, and the EPPM technique can include using codewords specified to provide a desired dimming level when such codewords are used to intensity modulate the optical source, without perceptible flicker.