Abstract: A wireless device includes a receiver and logic at least one of coupled to or integrated within the receiver. The logic receives, from a transmitter, a signal. The logic generates, based on an expected signal impulse response, a first expected signal. The generates, based on an attack pattern impulse response, an attack pattern. The logic determines, based on the signal, the first expected signal, the attack pattern, whether an attack is present in the signal.

Abstract: A method can include attaching a sensor device contained in a sensor structure to a body; sensing motion of the body with at least one motion capacitive sensor of the sensor device that senses a capacitance change resulting from a difference in orientation of the motion capacitive sensor and a surface of the body. If motion of the body is not sensed with the motion capacitive sensor, sensor readings can be acquired with a biophysical sensor that emits signals into a portion of the body below the sensor structure, and generate data for a feature of the body with the sensor readings. If motion of the body is not sensed with the motion capacitive sensor, data for the feature of the body is not generated. Related devices and systems are also disclosed.

Abstract: A method of ranging operations by a plurality of devices is provided. The method includes operating a first device to communicate using a first communication protocol. The method includes configuring, by the first device, a second device co-located with the first device to communicate using a second communication protocol different from the first communication protocol. The second device is configured to operate in a receive mode or a transmit mode when the first device transmits a ranging signal, and to operate in the receive mode when the first device receives the ranging signal. The method includes determining, based on measurements of an interfering signal received by the second device, whether the interfering signal comprises manipulations of the ranging signal. An apparatus and a wireless system are also provided.

Abstract: A wireless device includes a receiver adapted with Bluetooth® low energy (BLE) capability and logic at least one of coupled to or integrated within the receiver. The logic obtains, based on a received packet, a received signal. The logic identifies, based on the received signal and a reference signal, a fractional timing metric associated with the received signal. The logic calculates, based on the received signal, the reference signal, and an attack pattern, a correlation metric. The logic adjusts, based on the fractional timing metric, the correlation metric. The logic determines, based on the adjusted correlation metric and one or more thresholds, whether an attack is present in received signal.

Abstract: The embodiments described herein are directed at techniques to perform antenna/cable disconnection using co-located communication devices. A first device may transmit a reference signal over a predetermined bandwidth. A parasitic signal corresponding to the reference signal may be received via coupling at a second device that is co-located with the first device. The second device may be coupled to a first end of a cable via a port, with the second end of the cable configured to connect to an antenna. A processing device may determine a ratio of amplitudes of the parasitic signal over a predefined bandwidth. The processing device may then determine, based on the amplitude of the parasitic signal over the predefined bandwidth, a disconnect status of one or more of the antenna and the cable.

Abstract: A wireless device includes a receiver adapted with Bluetooth® low energy (BLE) capability and logic at least one of coupled to or integrated within the receiver. The logic determines frequency samples of bits of a predetermined pattern of a packet during a round-trip timing estimation of the packet, wherein the packet is received during a keyless access attempt of an enclosure having a transmitter and the receiver. The logic compares, to a reference frequency sample, the frequency samples of bits of the predetermined pattern. In response to determining a difference between the reference frequency sample and the frequency samples of bits of the predetermined pattern, the logic detects an intrusion associated with the predetermined pattern.

Abstract: A wireless device includes a receiver adapted with Bluetooth® low energy (BLE) capability and logic at least one of coupled to or integrated within the receiver. The logic determines frequency samples of bits of a predetermined pattern of a packet during a round-trip timing estimation of the packet, wherein the packet is received during a keyless access attempt of an enclosure having a transmitter and the receiver. The logic compares, to a reference frequency sample, the frequency samples of bits of the predetermined pattern. In response to determining a difference between the reference frequency sample and the frequency samples of bits of the predetermined pattern, the logic detects an intrusion associated with the predetermined pattern.

Abstract: A device includes an image capture device to obtain first imaging data, a sensor, and control logic coupled to the sensor. The control logic is to obtain sensor data from the sensor, generate second imaging data from the sensor data, determine a first correlation metric between the first imaging data and the second imaging data, determine whether the first correlation metric satisfies an authentication criterion, and enable an authentication operation responsive to determining the first correlation metric satisfies the authentication criterion.

Abstract: The embodiments described herein are directed at techniques to perform delay compensation for non-overlapping channels used for radar measurements. A device may receive a plurality of reference signals and a plurality of sensing signals on a plurality of non-overlapping wireless channels of a wireless network. The device may determine a plurality of channel transfer functions (CTF) s based on one of the plurality of reference signals and a corresponding one of the plurality of sensing signals. The device may correct each of the plurality of CTFs to generate a plurality of corrected CTFs. The device may merge the plurality of corrected CTFs to produce a merged CTF. The device may sense one or more objects within the wireless network based on the merged CTF.

Abstract: Techniques are disclosed to determine AoA of signals using co-located single-antenna radios such as BLE and Wi-Fi radios usually found in a wireless device. The co-located radios may have separate voltage controlled oscillators (VCO) that are not phase synchronized. The disclosed techniques use an internal path connecting the two radios through a RF switch under the control of a switch controller to allow the radios to synchronize or to compensate for their oscillator phase offset. The radios may use the RF switches of the internal path and RF switches between the radios and their antennas to sequence through an incident phase measurement stage to measure the phase difference of an incident signal received concurrently by the antennas and a radio synchronization stage to measure their oscillator phase offset to estimate the AoA of an incident signal. During the radio synchronization stage, the two radios are coupled through the internal path.

Abstract: Implementations disclosed describe devices for improving wireless localization and ranging operations. In an example embodiment, a circuit includes a receive chain configured to receive a first signal of a first frequency in a first frequency band. The circuit includes a transmit chain configured to transmit a second signal of a second frequency in a second frequency band. The circuit includes an active reflection circuit coupled between the receive and transmit chains. The active reflection circuit includes a frequency conversion scheme. The frequency conversion scheme is configured to receive an input signal from the RX chain at the first frequency, convert the input signal to an output signal at the second frequency, and provide the output signal to the TX chain.

Abstract: Implementations disclosed describe techniques and systems for efficient estimation of spatial characteristics of an outside environment of a wireless device. The disclosed techniques include generating multiple covariance matrices (CMs) representative of obtained sensing values. Different CMs may be associated with different frequency increments used in sensing signals to probe the outside environment. The disclosed techniques may further include determining eigenvectors for the CMs, and identifying, based on the determined eigenvectors, one or more spatial characteristics of the object in the outside environment.

Abstract: Implementations disclosed describe techniques and systems for efficient determination and tracking of trajectories of objects in an environment of a wireless device. The disclosed techniques include, among other things, obtaining multiple sets of sensing values that characterize one or more radio signals received, during a respective sensing event, from an object in an environment of the wireless device. The sensing signals may be carried by waves with randomly selected frequencies representing a portion of all frequencies that are used as working sensing frequencies. Multiple techniques of efficient frequency interpolation and temporal interpolation are disclosed that reconstruct the sensing values to the full range of working frequencies. The reconstructed sensing values may then be used to track objects in the environment.

Abstract: Implementations disclosed describe techniques and systems for efficient determination and tracking of trajectories of objects in an environment of a wireless device. The disclosed techniques include, among other things, determining multiple sets of sensing values that characterize one or more radio signals received, during a respective sensing event, from an object in an environment of the wireless device. Multiple likelihood vectors may be obtained using the sensing values and characterizing a likelihood that the object is at a certain distance from the wireless device. A likelihood tensor may be generated, based on the likelihood vectors, that characterizes a likelihood that the object is moving along one of a set of trajectories. The likelihood tensor may be used to determine an estimate of the trajectory of the object.

Abstract: Techniques are disclosed to leverage co-located radios such as BLE and Wi-Fi radios to increase the security of BLE ranging and localization. In one aspect, a transmitting BLE device may use a co-located Wi-Fi radio to transmit signals to interfere with an intruding device's interception of BLE RTT packets. The obfuscating Wi-Fi transmission may overlap a BLE RTT packet in the time domain with or without overlapping in the frequency domain. In one aspect, the co-located Wi-Fi radio may transmit pre-determined signature Wi-Fi signals concurrently with the BLE RTT packets to a receiver with co-located BLE and Wi-Fi radios. The receiver may detect a change in the pre-determined relationship between the two types of communication to reveal an intrusion attempt. In one aspect, a co-located Wi-Fi radio may capture parts of BLE RTT packets concurrently with a BLE radio transmitting or receiving BLE RTT packets to detect an intrusion attempt.

Abstract: The embodiments described herein are directed at techniques to perform antenna/cable disconnection using co-located communication devices. A first device may transmit a reference signal over a predetermined bandwidth. A parasitic signal corresponding to the reference signal may be received via coupling at a second device that is co-located with the first device. The second device may be coupled to a first end of a cable via a port, with the second end of the cable configured to connect to an antenna. A processing device may determine a ratio of amplitudes of the parasitic signal over a predefined bandwidth. The processing device may then determine, based on the amplitude of the parasitic signal over the predefined bandwidth, a disconnect status of one or more of the antenna and the cable.

Abstract: A device includes a transmitter coupled to an antenna, a receiver coupled to the at least one antenna, and a processing device to: cause the transmitter to radiate a radio frequency (RF) signal; receive, via the receiver, a reflective RF signal based on the radiated RF signal; detect, within a data array of the reflective RF signal, a maximum peak among a plurality of signal peaks, the maximum peak being indicative of a first distance to a first object relative to the at least one antenna; and cancel, using cascading peak cancellation on the spectrum, the maximum peak while detecting a first next-highest peak of the plurality of signal peaks compared to the maximum peak, the first next-highest peak being indicative of a second distance to a second object.

Abstract: One or more devices, systems, and/or methods are provided. In an example, a method includes mixing a passband receive signal with a local oscillator frequency to generate a receive signal, filtering the receive signal using a complex filter to generate a filtered receive signal, converting the filtered receive signal to a digital receive signal, and generating a corrected receive signal based on the digital receive signal by applying a first correction and a second correction to the digital receive signal, where the first correction reduces imbalance in the digital receive signal and the second correction reduces nonlinear direct current terms in the digital receive signal.

Abstract: A wireless device includes a receiver adapted with Bluetooth® low energy (BLE) capability and logic at least one of coupled to or integrated within the receiver. The logic determines frequency samples of bits of a predetermined pattern of a packet during a round-trip timing estimation of the packet, wherein the packet is received during a keyless access attempt of an enclosure having a transmitter and the receiver. The logic compares, to a reference frequency sample, the frequency samples of bits of the predetermined pattern. In response to determining a difference between the reference frequency sample and the frequency samples of bits of the predetermined pattern, the logic detects an intrusion associated with the predetermined pattern.

Abstract: Systems, methods, and devices enable radar operation in wireless devices. Methods include switching a first transceiver and a second transceiver from a communications mode to a sensing mode while maintaining a network connection, generating a designated waveform at a wireless device, and transmitting a first signal based on the designated waveform via the first transceiver of the wireless device. Methods also include receiving a second signal via the second transceiver of the wireless device, the second transceiver being collocated with the first transceiver within the wireless device, and generating sensing data based on the second signal, the sensing data comprising an indication of whether an entity has been detected by the wireless device.