Abstract: A device includes a receiver to receive a packet over a channel at a first frequency and generate a sampled stream of data at a first sample rate corresponding to the first frequency. A data resampler circuit includes a re-timer engine to determine, using a ratio between the first sample rate and a crystal oscillator (XO)-divided sample rate, re-timer values. The data resampler circuit includes a time shifting circuit to re-sample data values of the sampled stream of data associated with locations of the plurality of re-timer values. A correlation circuit uses the re-sampled data values, and the re-timer values to match an expected data pattern to a corresponding data pattern detected in a frame of the packet.

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 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: 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 to receive a packet via one or more antennas. A frame synchronization detection circuit coupled to the receiver identifies a data pattern within a portion of the packet. A correlation circuit coupled to the frame synchronization detection circuit identifies one or more properties of the data pattern and computes one or more values of a correlation peak using a correlation method. An adaptive threshold circuit coupled to the correlation circuit determines a correlation threshold value using the one or more properties of the data pattern and the one or more values of the correlation peak.

Abstract: Disclosed are methods and systems for a Bluetooth Low Energy (BLE) receiver to reduce the number of retransmission of packets needed to receive an error free packet. A softbit metric of a demodulator may be used to identify likely bit error positions of a corrupted packet and to correct bits of the corrupted packet corresponding to the identified bit error positions. When a demodulated packet fails the CRC, a receiver may identify one or more hypothesized bit error positions for the demodulated bits of the packet based on the softbit metric. The receiver may flip one or more of the demodulated bits corresponding to the hypothesized bit error positions. The receiver may determine if the packet after flipping the demodulated bits passes the CRC. If the CRC passes, the hypothesized bit error positions identifies the bit error positions of the corrupted packet and the receiver has corrected the bit errors.

Abstract: A method can include, by operation of controller circuits, determining a higher interference resistance (HIR) location coordinate (PIN) for a route between the wireless device and a target location. A wake message can be transmitted according to a first wireless protocol. In response to receiving an awake message according to a second wireless protocol, a location and quality value for the awake message can be stored. In response to being within a predetermined proximity of the HIR activation PIN without having received the awake message, a HIR wake message can be transmitted. In response to acquiring stored location and quality values, an HIR activation PIN can be selectively changed. A first wireless protocol can consume less power or be less resistant to interference than a second wireless protocol. Corresponding devices and systems are also disclosed.

Abstract: A wireless device includes a transmitter adapted with Bluetooth® low energy (BLE) capability and logic at least one of coupled to or integrated within the transmitter. The logic randomly generates a frequency offset based on bits within a frame synch packet to be transmitted during a keyless access attempt of an enclosure having a receiver. The logic causes the bits of the frame synch packet to be encrypted with an encryption key. The logic causes a frequency of the frame synch packet to modified by the frequency offset before the transmitter transmits the frame synch packet to the receiver.

Abstract: Systems, methods, and devices locate and identify wireless devices within operational environments such as automobile environments. Methods include determining, using one or more processors of a central wireless device, one or more identifiers associated with a peripheral wireless device, and performing, using the one or more processors, a wireless exchange with the peripheral wireless device, the wireless exchange comprising one or more channel sounding operations compatible with a wireless communications protocol. Methods further include determining a plurality of estimated distances based on channel sounding data obtained by the central wireless device and received from a plurality of remote wireless devices based on the wireless exchange, and determining a location and identity of the peripheral wireless device within an operational environment based on the plurality of estimated distances and the one or more identifiers.

Abstract: A device includes a transmitter to generate a sampled stream of data for a packet at a first sample rate. A data re-sampling circuit includes a re-timer engine to determine, using a fractional rate between the first sample rate and a crystal oscillator (XO)-divided sample rate, re-timer values including a difference between pulses of a pseudo-clock corresponding to the XO-integer-divided sample rate and closest corresponding pulses of a clock corresponding to the first sample rate, and a time-shifting circuit to re-sample data values of the sampled stream of data associated with locations of the plurality of re-timer values. A comparator circuit uses the re-sampled data values to match the re-sampled data values to a corresponding data value detected in the data pattern in the frame delimiter. A timing logic uses the plurality of re-timer values and the location of the marker in the data pattern in a timing calculation.

Abstract: Techniques described here introduce a processing pipeline for range estimation in phase-based ranging (PBR) based on scene types. The processing pipeline includes a scene identifier to identify a type of channel environment in PBR. The processing pipeline includes parallel moving average spectrums for oversampling data based on the identified scene for range estimation and faster Kalman Filter estimate convergence. The processing pipeline identifies a scene to characterize a channel environment between an initiator and a reflector based on data measured during PBR. The processing pipeline generates multiple spectral representations of the data based on the scene identified to estimate the range between the initiator and the reflector. The scene is identified based on statistical properties of the data and thresholds associated with different scenes.

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: 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: A wireless device includes a receiver to receive a packet via one or more antennas. A frame synchronization detection circuit coupled to the receiver identifies a frame synchronization pattern within a portion of the packet. A correlation circuit coupled to the frame synchronization detection circuit computes one or more values of a correlation peak using a correlation method. A fractional timing approximation circuit coupled to the correlation circuit determines a pulse shape using the one or more values of the correlation peak; and determines a fractional timing approximation for the packet using the pulse shape.

Abstract: Techniques described here introduce signature frequency modulation to unmodulated pulse signals as frequency chirps to enhance the security of multi-carrier phase-based ranging signals. The characteristics of the chirps may be mutually known by an initiator and a desired reflector of the ranging applications. The characteristics of the chirps may vary between the multi-carrier signals to thwart any attempt by an eavesdropper to predict the chirps. In one aspect, the characteristics of the chirps may be calculated for each timeslot of a ranging cycle by two authorized devices using a ciphering algorithm such as the Advanced Encryption Standard (AES) based on a shared security key. Each call of the AES may generate one or more pseudo-random numbers based on the shared security key and a time-varying initialization vector that increments every timeslot. Fields of the pseudo-random number may be extracted to determine the characteristics of the chirps associated with the timeslot.

Abstract: Techniques are described to improve the security of frame synchronization detection between wireless devices in high accuracy positioning (HAP) applications using personal area networks (PANs). A receiver may detect whether a frame synchronization pattern has been manipulated by comparing the sampled data of the received frame synchronization pattern with a reference waveform predicted as the frame synchronization pattern. The receiver may reuse the data in the correlation buffer at the moment a correlator finds a peak and declares that the synchronization pattern is found. The correlator may also provide fractional timing information associated with the correlation peak for the receiver to create a delayed reference phase differential pattern. The receiver may subtract the data in the correlation buffer by the delayed reference differential data and look for absolute deviations in the output of such subtraction that exceed a predetermined threshold.

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: Methods and systems for communication and sensing systems. The disclosed method includes, among other things, transmitting, from a first wireless device of a plurality of wireless devices, a sensing signal, receiving, by a second wireless device of the plurality of wireless devices, a set of signals derived from the sensing signal, and determining, based on characteristics of the set of signals, a first distance to each object located near the first wireless device and the second wireless device.