Patents by Inventor Leonard Rexberg
Leonard Rexberg has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240063760Abstract: Systems and methods for separate digital predistortion (S-DPD) for multi-band radios are disclosed. In one embodiment, a method of operation of a digital predistortion (DPD) actuator system for a radio node for a wireless network comprises receiving a plurality of input signals (x1, . . . , xB) for a plurality of frequency bands (b1, . . . , bB), respectively. The method further comprises, for each frequency band (bl) of the plurality of frequency bands (b1, . . . , bB), generating a plurality of predistorted signals for the frequency band (bl) based on the plurality of input signals (x1, . . . , xB) and a plurality of Look-Up Tables (LUTs) each having less than B dimensions and combining the plurality of predistorted signals for the frequency band (bl) to provide a combined predistorted signal for the frequency band (bl). In this manner, lower dimensionality LUTs are used, which in turn reduces cost and complexity of the DPD system.Type: ApplicationFiled: March 1, 2021Publication date: February 22, 2024Inventors: S M Shahrear Tanzil, Ashim Biswas, Leonard Rexberg
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Publication number: 20230385601Abstract: A method and related aspects are disclosed for determining one or more regions of interest in a multi-dimensional data set comprising a plurality of parameter sets, each parameter set comprising a parameter set identifier, a plurality of dimensions of selection conditions for assessing a configurable physical entity, and an indication of an assessed characteristic of the configurable physical entity.Type: ApplicationFiled: October 12, 2020Publication date: November 30, 2023Inventors: Prashant Sharma, Leonard Rexberg
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Publication number: 20230198588Abstract: Disclosed is a method for analog beamforming performed by a transmitter (110) of a wireless communication network (100). The transmitter (110) comprises a plurality of antenna branches (114, 115, 116), each antenna branch comprising an antenna element (111, 112, 113). The method comprises, for each antenna branch (114, 115, 116), obtaining a first and a second signal of an analog radio signal, the first and the second signal being split from the analog radio signal and the analog radio signal being the same at each of the antenna branches, and obtaining information indicating a branch-specific phase-shift angle and a branch-specific amplitude determined from information identifying a radiation pattern comprising at least two directions for wireless transmission to at least one receiver (120).Type: ApplicationFiled: December 4, 2020Publication date: June 22, 2023Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Miguel BERG, Tomas ANDREASON, Leonard REXBERG, Örjan RENSTRÖM, Sten WALLIN
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Publication number: 20230155286Abstract: Disclosed is a transmitter configured for analog beam steering, the transmitter comprising a plurality of antenna branches, each having an antenna (326). The transmitter comprises, at each of the antenna branches, a signal splitter (308) for splitting an analog radio signal into a number of beam signals, the number of beam signals equals a number of desired beams to be transmitted. Further, the transmitter comprises, for each of the number of beam signals, a phase shifter (310, 312) for phase shifting the beam signal according to a phase shift setting for that beam and for that antenna branch, the phase shift settings being taken from a single look-up table, and a signal combiner (314) for combining the phase shifted beam signals into one combined signal. Further, the transmitter is arranged for transmitting the combined signal from the antenna (326) of that antenna branch towards a receiver.Type: ApplicationFiled: April 2, 2020Publication date: May 18, 2023Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Leonard REXBERG, Örjan RENSTRÖM, Sten WALLIN
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Publication number: 20230137470Abstract: Systems and methods for linearizing a radio system are disclosed. In some embodiments, a radio system comprises an antenna array, transmit branches comprising respective power amplifiers, a predistortion subsystem comprising predistorters for the transmit branches respectively, a receive antenna element, a transmit observation receiver having an input coupled to the receive antenna element, and an adaptor. The predistorters predistort respective transmit signals to provide predistorted transmit signals to the respective transmit branches for transmission via respective active antenna elements in the antenna array. The transmit observation receiver is operable to receive, via the receive antenna element, a combined receive signal due to coupling between the receive antenna element and the active antenna elements.Type: ApplicationFiled: December 30, 2022Publication date: May 4, 2023Inventors: Leonard Rexberg, Göran Nilsson, Tomas Andersson, Pär Holmgren, Anders Martinsson
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Patent number: 11563408Abstract: Systems and methods for linearizing a radio system are disclosed. In some embodiments, a radio system comprises an antenna array, transmit branches comprising respective power amplifiers, a predistortion subsystem comprising predistorters for the transmit branches respectively, a receive antenna element, a transmit observation receiver having an input coupled to the receive antenna element, and an adaptor. The predistorters predistort respective transmit signals to provide predistorted transmit signals to the respective transmit branches for transmission via respective active antenna elements in the antenna array. The transmit observation receiver is operable to receive, via the receive antenna element, a combined receive signal due to coupling between the receive antenna element and the active antenna elements.Type: GrantFiled: November 13, 2018Date of Patent: January 24, 2023Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Leonard Rexberg, Göran Nilsson, Tomas Andersson, Pär Holmgren, Anders Martinsson
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Publication number: 20230006614Abstract: There is provided mechanisms for enabling linearization of a non-linear electronic device. A method is performed by a linearizer device. The method comprises receiving an input signal destined to be input to the non-linear electronic device. Input-output characteristics of the non-linear electronic device is represented by a model. The model is defined by a mathematical expression, and wherein input-output characteristics of the linearizer device is given by the linearization function. The linearization function is determined by applying a function recursion to the mathematical expression of the model. The method comprises obtaining an output signal by subjecting the input signal to the linearization function. The method comprises providing the output signal, instead of the input signal, as input to the non-linear electronic device, thereby enabling linearization of the non-linear electronic device.Type: ApplicationFiled: October 29, 2019Publication date: January 5, 2023Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Leonard REXBERG, Ashim BISWAS
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Patent number: 11438205Abstract: Systems and methods for ultra-wideband Crest Factor Reduction (CFR) are provided. In some embodiments, a method performed by a wireless node for performing CFR includes performing a first CFR step on a plurality of input signals at a first sampling rate with joint peak detection and band-specific noise shaping; and performing a second CFR step on the resulting plurality of input signals at a second sampling rate with joint peak detection and joint noise shaping where the second sampling rate is higher than the first sampling rate. In this way, Peak-to-Average Power Ratio (PAPR) reduction may be increased while the computational complexity is reduced.Type: GrantFiled: May 24, 2019Date of Patent: September 6, 2022Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Rui Hou, Leonard Rexberg, Bo Göransson, Richard Hellberg, Mats Klingberg, Stefan Engström
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Publication number: 20220006430Abstract: Systems and methods for linearizing a radio system are disclosed. In some embodiments, a radio system comprises an antenna array, transmit branches comprising respective power amplifiers, a predistortion subsystem comprising predistorters for the transmit branches respectively, a receive antenna element, a transmit observation receiver having an input coupled to the receive antenna element, and an adaptor. The predistorters predistort respective transmit signals to provide predistorted transmit signals to the respective transmit branches for transmission via respective active antenna elements in the antenna array. The transmit observation receiver is operable to receive, via the receive antenna element, a combined receive signal due to coupling between the receive antenna element and the active antenna elements.Type: ApplicationFiled: November 13, 2018Publication date: January 6, 2022Inventors: Leonard Rexberg, Göran Nilsson, Tomas Andersson, Pär Holmgren, Anders Martinsson
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Publication number: 20210176107Abstract: Systems and methods for ultra-wideband Crest Factor Reduction (CFR) are provided. In some embodiments, a method performed by a wireless node for performing CFR includes performing a first CFR step on a plurality of input signals at a first sampling rate with joint peak detection and band-specific noise shaping; and performing a second CFR step on the resulting plurality of input signals at a second sampling rate with joint peak detection and joint noise shaping where the second sampling rate is higher than the first sampling rate. In this way, Peak-to-Average Power Ratio (PAPR) reduction may be increased while the computational complexity is reduced.Type: ApplicationFiled: May 24, 2019Publication date: June 10, 2021Inventors: Rui HOU, Leonard REXBERG, Bo GÖRANSSON, Richard HELLBERG, Mats KLINGBERG, Stefan ENGSTRÖM
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Patent number: 11018747Abstract: A method and system of a configurable phased array transceiver are provided. A first beamforming unit is configured to provide a first beam. A second beamforming unit is configured to provide a second beam. A first bi-directional power controller is configured to combine or to split the first beam and the second beam. Each beamforming unit comprises a plurality of radio frequency (RF) front-ends, each front-end being configured to transmit and receive RF signals. Each beam is independently configurable to operate in a transmit (TX) or a receive (RX) mode.Type: GrantFiled: August 2, 2019Date of Patent: May 25, 2021Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Daniel J. Friedman, Joakim Hallin, Yahya Mesgarpour Tousi, Orjan Renstrom, Leonard Rexberg, Scott K. Reynolds, Bodhisatwa Sadhu, Stefan Sahl, Jan-Erik Thillberg, Alberto Valdes Garcia
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Patent number: 11005517Abstract: There is provided mechanisms for transmitting adjusted signals. A method is performed by a radio communications device comprising at least two radio transmitter units. The method comprises generating a signal to be transmitted by the radio transmitter units. The method comprises adjusting the signal at at least one of the radio transmitter units by dithering at least one radio parameter value such that the signals from all radio transmitter units are mutually different. The method comprises transmitting the adjusted signal by the radio transmitter units.Type: GrantFiled: September 7, 2016Date of Patent: May 11, 2021Assignee: Telefonaktiebolaget LM Ericsson (Publ)Inventors: Thomas Chapman, Farshid Ghasemzadeh, Ulf Gustavsson, Leonard Rexberg
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Patent number: 10530399Abstract: An transmitter arrangement and a method therein are provided for linearization of an active antenna array. The active antenna array comprises a plurality of antenna elements, which are associated with a plurality of power amplifiers. The active antenna array is further associated with a precoder having a number of input and output ports. The method comprises obtaining a first signal provided to the antenna array via a first input port of the precoder. The method further comprises adapting a pre-distorting linearizer connected to the first input port based on the first signal and on feedback from the plurality of antenna elements, resulting from the propagation of the first signal via the precoder, and via the plurality of power amplifiers. Embodiments are also provided for adapting a pre-distorting linearizer based on a plurality of input signals and feedback from the plurality of antenna elements.Type: GrantFiled: November 27, 2015Date of Patent: January 7, 2020Assignee: Telefonaktiebolaget LM Ericsson (Publ)Inventors: Bernt Johansson, Farshid Ghasemzadeh, Jan-Erik Thillberg, Leonard Rexberg
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Patent number: 10522919Abstract: A substrate integrated waveguide, SIW, antenna comprises a modified design of prior art SIW antennas that comprises an addition of electrically conducting means, e.g. vias, also along the substrate extending from the antenna aperture. By doing so, the SIW antenna of the present disclosure enables a reduction of mutual coupling between neighboring SIW antennas when arranged adjacent each other, e.g. in an array. Moreover, a reduction of back radiation in the SIW antenna can also be observed.Type: GrantFiled: May 7, 2015Date of Patent: December 31, 2019Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Elena Pucci, Leonard Rexberg
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Publication number: 20190356375Abstract: A method and system of a configurable phased array transceiver are provided. A first beamforming unit is configured to provide a first beam. A second beamforming unit is configured to provide a second beam. A first bi-directional power controller is configured to combine or to split the first beam and the second beam. Each beamforming unit comprises a plurality of radio frequency (RF) front-ends, each front-end being configured to transmit and receive RF signals. Each beam is independently configurable to operate in a transmit (TX) or a receive (RX) mode.Type: ApplicationFiled: August 2, 2019Publication date: November 21, 2019Inventors: Daniel J. Friedman, Joakim Hallin, Yahya Mesgarpour Tousi, Orjan Renstrom, Leonard Rexberg, Scott K. Reynolds, Bodhisatwa Sadhu, Stefan Sahl, Jan-Erik Thillberg, Alberto Valdes Garcia
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Patent number: 10425143Abstract: A method and system of a configurable phased array transceiver are provided. A first beamforming unit is configured to provide a first beam. A second beamforming unit is configured to provide a second beam. A first bi-directional power controller is configured to combine or to split the first beam and the second beam. Each beamforming unit comprises a plurality of radio frequency (RF) front-ends, each front-end being configured to transmit and receive RF signals. Each beam is independently configurable to operate in a transmit (TX) or a receive (RX) mode.Type: GrantFiled: May 16, 2017Date of Patent: September 24, 2019Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Daniel J. Friedman, Joakim Hallin, Yahya Mesgarpour Tousi, Örjan Renström, Leonard Rexberg, Scott K. Reynolds, Bodhisatwa Sadhu, Stefan Sahl, Jan-Erik Thillberg, Alberto Valdes Garcia
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Publication number: 20190222250Abstract: There is provided mechanisms for transmitting adjusted signals. A method is performed by a radio communications device comprising at least two radio transmitter units. The method comprises generating a signal to be transmitted by the radio transmitter units. The method comprises adjusting the signal at at least one of the radio transmitter units by dithering at least one radio parameter value such that the signals from all radio transmitter units are mutually different.Type: ApplicationFiled: September 7, 2016Publication date: July 18, 2019Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Thomas CHAPMAN, Farshid GHASEMZADEH, Ulfä GUSTAVSSON, Leonard REXBERG
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Publication number: 20180316367Abstract: An transmitter arrangement and a method therein are provided for linearization of an active antenna array. The active antenna array comprises a plurality of antenna elements, which are associated with a plurality of power amplifiers. The active antenna array is further associated with a precoder having a number of input and output ports. The method comprises obtaining a first signal provided to the antenna array via a first input port of the precoder. The method further comprises adapting a pre-distorting linearizer connected to the first input port based on the first signal and on feedback from the plurality of antenna elements, resulting from the propagation of the first signal via the precoder, and via the plurality of power amplifiers. Embodiments are also provided for adapting a pre-distorting linearizer based on a plurality of input signals and feedback from the plurality of antenna elements.Type: ApplicationFiled: November 27, 2015Publication date: November 1, 2018Inventors: Bernt Johansson, Farshid Ghasemzadeh, Jan-Erik Thillberg, Leonard Rexberg
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Publication number: 20180198537Abstract: A technique for calibrating an antenna array (300) is described. The antenna array (300) includes a plurality of antenna elements (302). As to a method aspect of the technique, at least a first antenna element and a second antenna element are configured for a first operating mode. At least a third antenna element is configured for a second operating mode. The first operating mode includes transmission and the second operating mode includes reception, or vice versa. A first signal transfer between the first antenna element and the third antenna element as well as a second signal transfer between the second antenna element and the third antenna element are measured. A ratio based is determined on the first signal transfer measurement and the second signal transfer measurement. The antenna array (300) is calibrated based on the determined ratio.Type: ApplicationFiled: July 1, 2015Publication date: July 12, 2018Inventors: Leonard Rexberg, Bernt Johansson, Jan-Erik Thillberg
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Publication number: 20180108969Abstract: A substrate integrated waveguide, SIW, antenna comprises a modified design of prior art SIW antennas that comprises an addition of electrically conducting means, e.g. vias, also along the substrate extending from the antenna aperture. By doing so, the SIW antenna of the present disclosure enables a reduction of mutual coupling between neighboring SIW antennas when arranged adjacent each other, e.g. in an array. Moreover, a reduction of back radiation in the SIW antenna can also be observed.Type: ApplicationFiled: May 7, 2015Publication date: April 19, 2018Inventors: Elena PUCCI, Leonard REXBERG