Abstract: Examples relate to a method for performing multi-carrier phase-based ranging between two radios including: i) calculating squared channel responses based on channel measurements between the two radios for a plurality of available carriers within a measurement band for the phase-based ranging, where the measurement band has at least one band gap each with one or more unusable carriers for calculating squared channel responses, ii) estimating, via a trained neural network, squared channel responses for the unusable carriers in a respective band gap from squared channel responses of carriers adjacent to the respective band gap, and iii) estimating a distance between the two radios based on both the calculated and estimated squared channel responses.

Abstract: An event-driven transmission method comprises converting at least one event to at least one corresponding pulse pair and transmitting the at least one pulse pair. In this context, a delay between each pulse pair represents a corresponding identifier with respect to the respective event or with respect to at least one corresponding object causing or experiencing the respective event.

Abstract: Example embodiments relate to methods for estimating a location of at least one mobile network node and respective network. An example method for estimating a location of at least one mobile network node of a wireless communication network including the at least one mobile network node and at least two static network nodes includes performing initial range measurements between the at least two static network nodes in a pairwise manner. The method also includes determining an initial location estimate. Additionally, the method includes determining an estimate for corresponding noise samples. Further, the method includes estimating corresponding initial parameters of a Gaussian mixture noise model. In addition, the method includes determining a weighted sum of respective refined parameters of the Gaussian mixture noise model and the corresponding initial parameters of the Gaussian mixture noise model.

Abstract: A method for automatic multi-object localization and/or vital sign monitoring is provided. The method comprises the steps of receiving a radar signal in order to form a corresponding observation matrix, reducing noise by applying singular value decomposition to the observation matrix, processing the result of the singular value decomposition by an independent component analysis in order to estimate the corresponding sources, and estimating propagation channels of the estimated sources by minimizing the corresponding residual error based on the observation matrix and the estimated sources.

Abstract: Example embodiments relate to methods for distance determination. One embodiment includes a method for determining a distance between a first radio signal transceiver and a second radio signal transceiver. The method includes receiving a first set and a second set of measurement results. The first set is acquired by the first radio signal transceiver based on signals transmitted from the second radio signal transceiver and the second set is acquired by the second radio signal transceiver based on signals transmitted from the first radio signal transceiver. The first set is representable as including, for each of a plurality of frequencies, a measurement pair. The method also includes calculating, for each frequency of the plurality of frequencies, a preliminary estimate of a value proportional to a one-way frequency domain channel response. Additionally, the method includes determining a final estimate of the value proportional to the one-way frequency domain channel response.

Abstract: A system is provided for performing secure key exchange between a plurality of nodes of a communication network. The system comprises a master node and at least two slave nodes. In this context, the master node is configured to authenticate the at least two slave nodes with a pair-wise authentication key corresponding to each pair of master node and slave nodes. The master node is further configured to generate a group authentication key common to the plurality of nodes. Furthermore, the master node is configured to encrypt the group authentication key with the pair-wise authentication key for each respective pair of master node and slave nodes, thereby generating a respective encrypted group authentication key. Moreover, the master node is configured to communicate the encrypted group authentication key to the respective slave nodes.

Abstract: A beam-steering antenna system for improving the angular coverage comprises a transmission line comprising a first end and a second end. The antenna system further comprises a plurality of antenna elements selectively coupled to the transmission line for selectively coupling energy within the transmission line to the plurality of antenna elements. Furthermore, the antenna system comprises a power amplifier coupled to the first end of the transmission line configured to couple-in an input signal into the transmission line during a first operating period. Moreover, the antenna system comprises a delay line coupled to the second end of the transmission line configured to reflect a portion of the input signal into the transmission line, thereby providing a reflection signal during a second operating period.

Abstract: A device for light-based analysis of a substance in a liquid sample comprises: an analysis cell for holding the liquid sample; wherein the analysis cell comprises a first wall portion for passing light generated by a light source into the analysis cell, and a second wall portion for passing light from the analysis cell to a light detector; and a plunger configured for movement along walls of the analysis cell for allowing entry of the liquid sample into the analysis cell and pushing the liquid sample out of the analysis cell; wherein at least one wiper is arranged on the plunger for cleaning the first and second wall portions during movement of the plunger.

Abstract: A device for light-based analysis of a substance in a liquid sample comprises: an analysis cell for holding the liquid sample during analysis; a plunger configured for movement along walls of the analysis cell for allowing entry of the liquid sample into the analysis cell and pushing the liquid sample out of the analysis cell, wherein a first analysis measurement is allowed to be performed while a second portion of the plunger is arranged between a light source and a light detector; wherein the plunger is movable to a completely retracted position in the analysis cell for allowing a second analysis measurement to be performed such that light being detected by the light detector is passed through the liquid sample filling a space between opposite walls of the analysis cell.

Abstract: A powering apparatus for wireless powering of a power receiving device comprises: a plurality of power transmitters configured to provide inductive coupling to the power receiving device; and an oscillator configured to provide a reference oscillator signal; wherein each power transmitter comprises an inductive element and a driving circuitry for providing a current signal for driving the inductive element, wherein the driving circuitry of each power transmitter is configured to receive the reference oscillator signal and a feedback signal of a current through the inductive element for controlling a phase of the current signal in relation to a phase of the reference oscillator signal, each of the plurality of power transmitters being configured for outputting a powering signal controlled by a common phase relation to the reference oscillator signal.

Abstract: A method of generating an impulse for impulse radio transmission signals and an impulse-radio ultra-wideband transmitter are provided. In one aspect, the method includes distributing input digital data according to time information data and amplitude information data along a first modulation path and a second modulation path, respectively. Pulse position modulation is performed based on the time information data along the first modulation path to define a timing position of the impulse. Pulse amplitude modulation is performed based on the amplitude information data along the second modulation path to define an envelope of the impulse. The input digital data can be distributed according to phase information data along a third modulation path, and phase shift keying modulation can be performed based on the phase information data along the third modulation path to define a phase of a carrier signal of the impulse.

Abstract: According to an aspect there is provided a method for automatic maintenance of a dialysis system. The dialysis system includes a plurality of filter sections where each filter section includes a blood flow channel, a dialysate flow channel, and a membrane separating the blood flow channel from the dialysate flow channel and having a plurality of pores through which substances are exchanged between a blood flow in the blood flow channel and a dialysate flow in the dialysate flow channel. The method includes determining, for each filter section of the plurality of filter sections, whether a maintenance criterion is fulfilled. The method also includes triggering a maintenance event for a filter section of the plurality of filter sections for which the maintenance criterion is fulfilled. The method also includes executing the maintenance event and optionally administering a thrombolytic agent to the blood flow channel of the filter section.

Abstract: A system for electrical impedance tomography comprises: a plurality of electrodes; a plurality of impedance measurement units, each being associated with two or more electrodes, and wherein each impedance measurement unit comprises a current generator for generating a stimulation current between the electrodes and an amplifier for amplifying a measurement voltage between the electrodes; wherein the system is configured to perform a plurality of impedance measurements, wherein, for each impedance measurement, one impedance measurement unit is set in a stimulation mode for providing a stimulation current into the object, and wherein the impedance measurement unit being set in the stimulation mode is switched among the plurality of impedance measurement units, and wherein each impedance measurement unit is configured to be set in a calibration mode during at least one of the plurality of impedance measurements.

Abstract: A method of ranging between a first and a second radio signal transceiver comprises calculating a preliminary estimate of a value proportional to a one-way frequency domain channel response, for a frequency of a plurality of frequencies and for each of a first antenna combination and a second antenna combination of a plurality of antenna combinations; calculating a comparison value for the preliminary estimate, for the frequency and for each of the first antenna combination and the second antenna combination; determining, for the frequency and the first antenna combination, a corrected estimate of the value proportional to the one-way frequency domain channel response based on the preliminary estimate and the comparison value, for the first antenna combination and the second antenna combination; and performing a ranging calculation between the first and the second radio signal transceiver based on a plurality of such corrected estimates.

Abstract: A method for extracting spatial resolution and/or velocity resolution of a single-input single-output radar acquiring raw radar data with a frequency scanning antenna is provided. The method includes steering a radar beam with the aid of the frequency scanning antenna with respect to an area to be illuminated by the radar, and dividing the area into at least two angular sectors. In this context, the at least two angular sectors are configured in a manner that the at least two angular sectors overlap with respect to each other.

Abstract: A method of secure wireless ranging between a verifier node and a prover node comprises performing a measurement procedure resulting in a two-way phase measurement and a round-trip time measurement between the verifier node and the prover node. The measurement procedure comprises the verifier node transmitting on the frequency a verifier packet, the prover node receiving the verifier packet and performing a phase measurement of a verifier carrier signal and a time-of-arrival measurement of a verifier frame delimiter, the prover node transmitting a prover packet, and the verifier node receiving the prover packet and performing a phase measurement of the prover carrier signal and a time-of-arrival measurement of the prover frame delimiter. The method further comprises calculating a distance between the verifier node and the prover node based on the two-way phase measurements and the round-trip time measurements for the plurality of frequencies.

Abstract: A circuit for optoelectronic down-conversion of a terahertz, THz, signal comprises a first photodiode and a second photodiode configured to be excited by an optical beat signal. The photodiodes are coupled in series through a common antenna. The terminals of the antenna are coupled to form an output terminal and the antenna is configured to receive the terahertz, THz, signal. The photodiodes thereby, via the optical beat signal, respectively, down-convert the THz signal and generate a current comprising an intermediate frequency, IF, component and a direct current, DC, component. The respective generated currents are summed at the output terminal, thereby obtaining the IF components and cancelling the DC components.

Abstract: Example embodiments relate to systems and methods for analog-to-digital signal conversion. One embodiment includes a system for analog-to-digital signal conversion. The system includes an analog input signal. The system also includes a digital-to-analog converter configured to generate a reference signal. Further, the system includes an amplifier configured to amplify an error signal that includes a difference between the analog input signal and the reference signal. Additionally, the system includes a level-crossing based sampling circuit that includes a first comparator configured to compare the error signal with respect to a first reference level, and a second comparator configured to compare the error signal with respect to a second reference level, thereby generating event-based reset signals corresponding to a plurality of sampling instances in order to reset the digital-to-analog converter.

Abstract: A device for calculating cardiovascular heartbeat information is configured to receive an electronic audio signal with information representative of a human voice signal in the time-domain, the human voice signal comprising a vowel audio sound of a certain duration and a fundamental frequency; generate a power spectral profile of a section of the electronic audio signal, and detect the fundamental frequency (F0) in the generated power spectral profile; filter the received audio signal within a band around at least the detected fundamental frequency (F0) and thereby generating a denoised audio signal; generate a time-domain intermediate signal that captures frequency, amplitude and/or phase of the denoised audio signal; detect and calculate heartbeat information within a human cardiac band in the intermediate signal.

Abstract: An electronic system for bioimpedance signal acquisition, comprises: a current signal injection module configured for generating a current signal to be applied to a subject; a bioimpedance signal measurement module configured for measuring a bioimpedance signal based on a voltage generated by the current signal; a data quality detection module configured for detecting an AC or a DC level of the measured bioimpedance signal and detecting whether the AC or DC level is within or outside an AC reference value range and a DC reference value range, respectively; and a signal adaptation module configured for modifying at least one parameter of the current signal injection module or the bioimpedance signal measurement module based on said detection of the AC or DC level in relation to the AC reference value range and the DC reference value range, respectively.