Abstract: A method for spatial beamforming is disclosed, wherein the beamforming is implemented using a cascade of beamformers comprising at least one time-domain beamformer and at least one frequency-domain beamformer. The method comprises exchanging information between the time-domain beamformer and the frequency-domain beamformer. The exchange of information comprises one or more of: provision (from the time-domain beamformer to the frequency-domain beamformer) of an indication of a fallback beam for determination of beamforming weights of the frequency-domain beamformer, provision (from the time-domain beamformer to the frequency-domain beamformer) of an indication of discarded time-domain channel estimates for determination of beamforming weights of the frequency-domain beamformer, and provision (from the frequency-domain beamformer to the time-domain beamformer) of an indication of channel estimation quality of the frequency-domain beamformer for determination of beamforming weights of the time-domain beamformer.

Abstract: A method is disclosed for spatial beamforming using a time-domain beamformer. The method comprises determining frequency-domain channel estimates per antenna port of the time-domain beamformer based on received narrowband reference signaling, and determining beamforming weights of the time-domain beamformer based on the frequency-domain channel estimates per antenna port of the time-domain beamformer. The narrowband reference signaling comprises a plurality of reference signaling occasions distributed over a reference signaling time window. Each reference signaling occasion comprises reference signaling with a reference signaling bandwidth and a respective center frequency, and the reference signaling bandwidth is more narrow than a communication bandwidth for the spatial beamforming. In some embodiments, the center frequencies are distributed within the communication bandwidth, and at least some of the center frequencies are different.

Abstract: A network node (210) and method therein for antenna calibration in a wireless communication system (200) are provided. The network node (210) comprises two or more antenna panels which are separated and isolated from each other. At least one antenna panel (411) comprises both transmitting and receiving (TX/RX 411) antenna arrays, and at least one antenna panel (412) comprises only receiving (RX 412) antenna array. The TX/RX antenna arrays are pre-calibrated and one or more spatial-temporal channel parameters are estimated for the TX/RX antenna arrays based on estimated channel-state information for a propagation channel between a user equipment and the TX/RX antenna arrays using a signal received from the user equipment via the TX/RX antenna arrays.

Abstract: A cellular communication system that comprises a first node (101, 201, 301, 401, 501, 601, 701, 801, 901, 101) senses a first object by using a narrowband receiver of the first node (101, 201, 301, 401, 501, 601, 701, 801, 901, 101) to simultaneously receive (1403) a plurality of different directional narrowband receive beams (309, 807). A first directional narrowband receive beam is identified (1403) therefrom, wherein a first signal received in the first directional narrowband receive beam is associated with a first reflection from the first object. A receive direction of the first directional narrowband receive beam is used (1405) as a first estimate (313) of a direction of the first object relative to the first node (101, 201, 301, 401, 501, 601, 701, 801, 901, 101). The first estimate (313) of the direction of the first object and additional information are used (1407) to derive a first estimate (111, 209) of a position of the first object.

Abstract: The disclosure relates to an autonomous moving object comprising: a radar sensor configured to scan a volume in front of the object, and a radar signal processor configured to: acquire a sequence of radar responses, each radar response of the sequence being acquired at a different position (P) of the autonomous moving object, and perform synthetic aperture radar processing of at least parts of the acquired sequence of radar responses to obtain a synthetic aperture radar image representing response amplitude as a function of at least distance and angle with respect to the radar sensor, the autonomous moving object further comprising: a controller configured to detect presence of a potential obstacle within a pre-defined sub-volume in front of the autonomous moving object by analyzing the synthetic aperture radar image and, in response to detecting presence of a potential obstacle, output a control command configured to cause a changed movement of the autonomous moving object.

Abstract: A method for performing radar measurements, comprising first through fourth measurements, each including: generating a radar pulse, transmitting the radar pulse towards a radar target, generating a reference pulse, receiving a signal comprising a reflection of the radar pulse after being reflected, mixing the received signal with the reference pulse, and integrating the mixing product; wherein generating the reference pulse is delayed with respect to generating the radar pulse by a first, second, third and fourth delay time, respectively, wherein a difference between the second and first delay time, between the third and second delay time, and between the fourth and third delay time, each corresponds to a quarter of a wavelength of the radar pulses; and determining a first and second value representing a difference between the integrated mixing product of the first and third radar measurements, and between the integrated mixing product of the second and fourth radar measurements, respectively.

Abstract: An autonomous moving object comprising a radar sensor is provided. The radar sensor is configured to, during movement, acquire data sets representing reflections from surface portions located within a distance range, and, at least at a sequence of occasions, illuminate a surface region and acquire a data set representing, for each of a set of distances within said distance range, an amplitude and a phase of reflected radar signals received from surface portions located at said distance. Said surface regions comprise common sub-region illuminated at each of said occasions. A radar signal processor is configured to receive the data sets acquired at each of said sequence of occasions. The received data sets form a collection of data sets, wherein each data set of said collection comprises a data subset pertaining to said common sub-region. A surface classifier processor is configured to output a classification of a surface type of the surface based on said collection of data subsets.

Abstract: The disclosure relates to an autonomous moving object comprising: a radar sensor configured to scan a volume in front of the object, and a radar signal processor configured to: acquire a sequence of radar responses, each radar response of the sequence being acquired at a different position (P) of the autonomous moving object, and perform synthetic aperture radar processing of at least parts of the acquired sequence of radar responses to obtain a synthetic aperture radar image representing response amplitude as a function of at least distance and angle with respect to the radar sensor, the autonomous moving object further comprising: a controller configured to detect presence of a potential obstacle within a pre-defined sub-volume in front of the autonomous moving object by analyzing the synthetic aperture radar image and, in response to detecting presence of a potential obstacle, output a control command configured to cause a changed movement of the autonomous moving object.

Abstract: The present inventive concept relates to a method for determining a flow metric for a flow of granular particles, the method comprising: performing, using a radar sensor, a plurality of radar measurements distributed over a measurement time period comprising: transmitting radar pulses through the flow and in a direction across the flow, receiving reflected signals, and sampling the reflected signals; estimating, using a radar signal processor and based on the samples, a variation over time of an amplitude of the reflected signals; and determining, using the radar signal processor, the flow metric based on the estimated variation, wherein the flow metric is indicative of a flow rate of the flow of granular particles.

Abstract: The disclosure relates to an autonomous moving object comprising: a radar sensor configured to scan a volume in front of the object, and a radar signal processor configured to: acquire a sequence of radar responses, each radar response of the sequence being acquired at a different position of the autonomous moving object, and perform synthetic aperture radar processing of at least parts of the acquired sequence of radar responses to obtain a synthetic aperture radar image representing response amplitude as a function of at least distance and angle with respect to the radar sensor, the autonomous moving object further comprising: a controller configured to detect presence of a potential obstacle within a pre-defined sub-volume in front of the autonomous moving object by analyzing the synthetic aperture radar image and, in response to detecting presence of a potential obstacle, output a control command configured to cause a changed movement of the autonomous moving object.

Abstract: A method of controlling operation of a field-powered biometric device comprising biometric acquisition circuitry, processing circuitry controllable to transition between a first functional state having a first power consumption and a second functional state having a second power consumption lower than the first power consumption, and power management circuitry. The method comprises the steps of monitoring, by the power management circuitry, a property indicative of a supply voltage to the processing circuitry; controlling, when the monitored property indicates that the supply voltage has fallen to a first threshold voltage, the processing circuitry to transition from the first functional state to the second functional state; and controlling, when the monitored property indicates that the supply voltage has increased to a second threshold voltage higher than the first threshold voltage, the processing circuitry to transition from the second functional state to the first functional state.

Abstract: The present invention relates to a method for progressively enrolling a user of a smart card, specifically applying a multi-step activation process for enabling fingerprint authentication for the smart card. The invention also relates to a corresponding smart card and to a computer program product. The present invention provides a solution for seamless fingerprint enrollment for a smart card user.

Abstract: An autonomous moving object comprising a radar sensor is provided. The radar sensor is configured to, during movement, acquire data sets representing reflections from surface portions located within a distance range, and, at least at a sequence of occasions, illuminate a surface region and acquire a data set representing, for each of a set of distances within said distance range, an amplitude and a phase of reflected radar signals received from surface portions located at said distance. Said surface regions comprise common sub-region illuminated at each of said occasions. A radar signal processor is configured to receive the data sets acquired at each of said sequence of occasions. The received data sets form a collection of data sets, wherein each data set of said collection comprises a data subset pertaining to said common sub-region. A surface classifier processor is configured to output a classification of a surface type of the surface based on said collection of data subsets.

Abstract: A method for granting access for a user to a domain which is subject to an access restriction, wherein the user belongs to a group of one or more user shaving an access privilege in relation to the domain. The method comprises acquiring a first set of biometric data associated with the user. A first identification is successful if a comparison of the first set of biometric data to previously acquired data relating to the user, or to the group of users, indicates that the user belongs to the group. The method also comprises acquiring a second set of biometric data associated with the user responsive to the first identification being successful. A second identification is successful if a comparison of the second set of biometric data to previously acquired data relating to the user indicates that the user has the access privilege.

Abstract: The disclosure relates to an autonomous moving object comprising: a radar sensor configured to scan a volume in front of the object, and a radar signal processor configured to: acquire a sequence of radar responses, each radar response of the sequence being acquired at a different position (P) of the autonomous moving object, and perform synthetic aperture radar processing of at least parts of the acquired sequence of radar responses to obtain a synthetic aperture radar image representing response amplitude as a function of at least distance and angle with respect to the radar sensor, the autonomous moving object further comprising: a controller configured to detect presence of a potential obstacle within a pre-defined sub-volume in front of the autonomous moving object by analyzing the synthetic aperture radar image and, in response to detecting presence of a potential obstacle, output a control command configured to cause a changed movement of the autonomous moving object.

Abstract: A method for granting access for a user to a domain which is subject to an access restriction, wherein the user belongs to a group of one or more user shaving an access privilege in relation to the domain. The method comprises acquiring a first set of biometric data associated with the user. A first identification is successful if a comparison of the first set of biometric data to previously acquired data relating to the user, or to the group of users, indicates that the user belongs to the group. The method also comprises acquiring a second set of biometric data associated with the user responsive to the first identification being successful. A second identification is successful if a comparison of the second set of biometric data to previously acquired data relating to the user indicates that the user has the access privilege.

Abstract: The present disclosure generally relates to a method for authenticating a user by means of an electronic device, where the electronic device comprises a first and a second control unit adapted to process a biometric representation from a biometric sensor. Preferably, the second control unit comprises a secure element and/or a secure block adapted to provide a secure processing environment. The present disclosure also relates to a corresponding electronic device and to a computer program product.

Abstract: The present disclosure generally relates to a method for authenticating a user by means of an electronic device, where the electronic device comprises a first and a second control unit adapted to process a biometric representation from a biometric sensor. Preferably, the second control unit comprises a secure element and/or a secure block adapted to provide a secure processing environment. The present disclosure also relates to a corresponding electronic device and to a computer program product.

Abstract: A method of controlling operation of a field-powered biometric device comprising biometric acquisition circuitry, processing circuitry controllable to transition between a first functional state having a first power consumption and a second functional state having a second power consumption lower than the first power consumption, and power management circuitry. The method comprises the steps of monitoring, by the power management circuitry, a property indicative of a supply voltage to the processing circuitry; controlling, when the monitored property indicates that the supply voltage has fallen to a first threshold voltage, the processing circuitry to transition from the first functional state to the second functional state; and controlling, when the monitored property indicates that the supply voltage has increased to a second threshold voltage higher than the first threshold voltage, the processing circuitry to transition from the second functional state to the first functional state.

Abstract: The present invention relates to a method for progressively enrolling a user of a smart card, specifically applying a multi-step activation process for enabling fingerprint authentication for the smart card. The invention also relates to a corresponding smart card and to a computer program product. The present invention provides a solution for seamless fingerprint enrollment for a smart card user.