Abstract: A method for wireless detection of a subject rising from a rest state includes producing transmitted wireless signals from one or more transmitting antennas, receiving reflected wireless signals at one or more receiving antennas, and processing the reflected wireless signals in a computer. The computer iteratively aligns candidate trajectories with a template trajectory until the current and previous template trajectories are within a predetermined distance from each other. A final template trajectory is used to determine a lying-down surface exit initiation area, a lying-down surface exit initiation area exit time, a TUG plane or radius entry time, and a TUG time.

Abstract: A wireless method for predicting an inflammation state of a person under observation, comprising: (a) transmitting frequency-modulated continuous-wave (FMCW) wireless signals from one or more transmitting antennas; (b) receiving reflected FMCW wireless signals with one or more receiving antennas, at least some of the reflected FMCW wireless signals being reflected from the person; (c) repeating steps (a) and (b) continuously while the person is under observation; (d) producing reflected FMCW wireless data based on the reflected FMCW wireless signals; (e) providing the reflected FMCW wireless data as an input to a trained machine-learning (ML) model, the trained ML model having been trained with ground-truth data that represents ground-truth inflammation states and ground-truth reflected FMCW wireless data of one or more subjects with respect to time; and (f) predicting, with the trained ML model, whether the person under observation is in an inflamed state or a non-inflamed state.

Abstract: A method for wireless detection of a subject rising from a rest state includes producing transmitted wireless signals from one or more transmitting antennas, receiving reflected wireless signals at one or more receiving antennas, and processing the reflected wireless signals in a computer. The computer iteratively aligns candidate trajectories with a template trajectory until the current and previous template trajectories are within a predetermined distance from each other. A final template trajectory is used to determine a lying-down surface exit initiation area, a lying-down surface exit initiation area exit time, a TUG plane or radius entry time, and a TUG time.

Abstract: A method, a system, and a computer program product for determining a location of a communication device. Data corresponding to a detected transmission of a data packet between a tag device and one or more communication devices is received on one or more communication channels. At least one of a channel state information and a signal strength associated with the detected transmission for each frequency band in a plurality of frequency bands are determined. Based on the determined channel state information, one or more lengths of signal paths corresponding to the detected transmission of the data packet are determined. A shortest length in across one or more communication devices is selected to determine a location of the tag device.

Abstract: A method for wireless power transfer adapts to changing configuration of receivers, including changes in number of, location and/or orientiation of, magnetic coupling to, and load of circuits (e.g., battery charging circuits) of one or more receivers. The adaptation can be performed without interrupting optimal or near-optimal power transfer to the receivers, and can provide a measure of fairness among multiple receivers.

Abstract: An approach to authentication, provisioning, and/or access control makes use of a user performing prescribed motion of their body and/or particular limbs (e.g., a prescribed number of steps in one or more directions), for example, as part of a challenge-response protocol. The motion may be detected using the radio frequency reflection techniques. Applications of this approach may include provisioning of equipment that monitors motion within an environment. In some examples, the environment is defined as part of the user performing the prescribed motion (e.g., the user walks around a boundary of their house).

Abstract: Multiple radio transmissions are processed to determine, for each of a number of directions of arrival of the radio transmissions, a most direct direction of arrival, for example, to distinguish a direct path from a reflected path from the target. In some examples, the radio transmissions include multiple frequency components, and channel characteristics at different frequencies are compared to determine the direct path.

Abstract: In a data-processing system a frame generator generates frames from the reflection data representing successive patterns of reflection that result from having launched a transmitted radio signal into a space. Each frame indicates a pattern of reflection at a particular time that corresponds to the frame. A trajectory generator receives the frame data and uses it to identify of a subject's trajectory through the space. An identification module identifies the subject based at least in part on the trajectory.

Abstract: Characteristics of channels from an antenna array to a transceiver are characterized based on reciprocity in an approach that eliminates a need for channel feedback from the transceiver. In some embodiments, these channel characteristics are used in MIMO communication to a plurality of transceivers from the antenna array.

Abstract: A method for monitoring periodic motions of one or more subjects uses signal reflections from the subjects. The method includes emitting a transmitted signal from a transmitting antenna and receiving a received signal at one or more receiving antennas. The received signal includes a combination of a number of reflections of the transmitted signal, at least some of which are associated with the subjects. The received signal, including the reflections, is processed to determine an estimate of a fundamental frequency of the periodic motions.

Abstract: A method, a system, and a computer program product for determining a location of a communication device. Data corresponding to a detected transmission of a data packet between a tag device and one or more communication devices is received on one or more communication channels. At least one of a channel state information and a signal strength associated with the detected transmission for each frequency band in a plurality of frequency bands are determined. Based on the determined channel state information, one or more lengths of signal paths corresponding to the detected transmission of the data packet are determined. A shortest length in across one or more communication devices is selected to determine a location of the tag device.

Abstract: An approach to acquisition of a propagation direction using a phased antenna array avoids a need to scan space. Given all possible directions for setting the antenna beam, the approach provably finds the optimal direction in logarithmic number of measurements. Further, the approach can be applied within the existing 802.11ad standard for mmWave LAN, and can support both clients and access points.

Abstract: A method for monitoring a patient undergoing therapy includes wirelessly tracking a motion of the patient over time to generate a sequence of data representing the motion of the patient over time, processing the sequence of data representing the motion of the patient over time using a biometric parameter extraction module to extract data representing one or more biometric parameters, determining an estimated response of the patient to the therapy based at least in part of the data representing one or more biometric parameters, and providing a characterization of the estimated response of the patient to the therapy to one or more of a caretaker, the patient, or a clinician.

Abstract: A backscatter approach is particularly customized for deep tissue devices, which do not require active signal transmission for localization of or data communication from the devices. The design overcomes interference from the body surface, and localizes the in-body backscatter devices even though the signal travels along non-straight paths. Data communication for the in-body device is also available using the approach.

Abstract: A method includes determining, by a base station including a number of transmitting coils, a first number of mutual magnetic parameters, each mutual magnetic parameter being associated with one of the transmitting coils and a receiving coil of at least one receiving coil associated with at least one electronic device remotely located from and to be remotely charged by the base station, determining a plurality of control signals based on the first number of mutual magnetic parameters, each control signal being associated with a corresponding one of the transmitting coils, providing each control signal to a driving circuit coupled to the control signal's corresponding transmitting coil, and using each control signal to cause the driving circuit coupled to the control signal's corresponding transmitting coil to cause a current with a magnitude and phase determined from the control signal to flow in the corresponding transmitting coil.

Abstract: A method for pose recognition includes storing parameters for configuration of an automated pose recognition system for detection of a pose of a subject represented in a radio frequency input signal. The parameters having been determined by a first process including accepting training data including a number of images including poses of subjects and a corresponding number of radio frequency signals and executing a parameter training procedure to determine the parameters. The parameter training procedure including, receiving features characterizing the poses in each of the images, and determining the parameters that configure the automated pose recognition system to match the features characterizing the poses from the corresponding radio frequency signals.

Abstract: Characteristics of channels from an antenna array to a transceiver are characterized based on reciprocity in an approach that eliminates a need for channel feedback from the transceiver. In some embodiments, these channel characteristics are used in MIMO communication to a plurality of transceivers from the antenna array.

Abstract: An approach to acquisition of a propagation direction using a phased antenna array avoids a need to scan space. Given all possible directions for setting the antenna beam, the approach provably finds the optimal direction in logarithmic number of measurements. Further, the approach can be applied within the existing 802.11ad standard for mmWave LAN, and can support both clients and access points.

Abstract: A method for wireless power transfer adapts to changing configuration of receivers, including changes in number of, location and/or orientiation of, magnetic coupling to, and load of circuits (e.g., battery charging circuits) of one or more receivers. The adaptation can be performed without interrupting optimal or near-optimal power transfer to the receivers, and can provide a measure of fairness among multiple receivers.

Abstract: A method for tracking a sleep stage of a subject takes as input a sequence of observations sensed over an observation time period. The sequence of observation values is processed to yield a corresponding sequence of encoded observations using a first artificial neural network (ANN) and the sequence of encoded observation values is processed to yield a sequence of sleep stage indicators using a second artificial network. Each observation may correspond to an interval of the observation period (e.g., at least 30 seconds). The first ANN may be configured to reduce information representing a source of the sequence of observations in the encoded observations.