Patents by Inventor Jan Hellmann
Jan Hellmann 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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Patent number: 12040864Abstract: The present subject matter relates to an apparatus for a communication system. The apparatus is configured for: for each beam direction of a set of beam directions of an antenna array of the communication system, determining a level of a passive intermodulation, PIM, signal at a receiver of the communication system, the PIM signal being caused by a set of signals transmitted by the antenna array in the beam direction, identifying beam directions of the set of beam directions whose PIM level is higher than a predefined threshold, adapting a beamforming of signals in at least part of the identified beam directions to mitigate the PIM level at the receiver.Type: GrantFiled: February 10, 2020Date of Patent: July 16, 2024Assignee: Nokia Solutions and Networks OyInventors: Marko Fleischer, Jan Hellmann, Rene Roschke, Helmut Heinz
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Publication number: 20240030948Abstract: Disclosed is a method comprising transmitting a first signal, obtaining an indication of a harmonic, wherein the harmonic is caused by the transmission of the first signal, determining, based on the indication of the harmonic, an estimation of the harmonic, receiving a second signal, wherein the second signal comprises the harmonic, and subtracting the estimation of the harmonic from the second signal.Type: ApplicationFiled: July 18, 2023Publication date: January 25, 2024Inventors: Marko FLEISCHER, Björn JELONNEK, Martin STEIERT, Rene RÖSCHKE, Jan HELLMANN, Dirk SÖNNICHSEN
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Publication number: 20230081201Abstract: The present subject matter relates to an apparatus for a communication system. The apparatus is configured for: for each beam direction of a set of beam directions of an antenna array of the communication system, determining a level of a passive intermodulation, PIM, signal at a receiver of the communication system, the PIM signal being caused by a set of signals transmitted by the antenna array in the beam direction, identifying beam directions of the set of beam directions whose PIM level is higher than a predefined threshold, adapting a beamforming of signals in at least part of the identified beam directions to mitigate the PIM level at the receiver.Type: ApplicationFiled: February 10, 2020Publication date: March 16, 2023Inventors: Marko Fleischer, Jan HELLMANN, Rene ROSCHKE, Helmut HEINZ
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Patent number: 11575401Abstract: An apparatus includes an estimation circuitry configured to receive a first set of one or more digital signals of transmitters of a communication system, and capture a set of one or more radio frequency signals that have been generated from the first set of digital signals The set of radio frequency signals being input of an antenna system of the communication system. Based on the first set of digital signals and the corresponding set of radio frequency signals, a set of weights related to a distortion effect caused by the generation of the radio frequency signals is derived. A received second set of digital signals is weighted using the set of weights, resulting in filtered signals. Using the filtered signals, a correction signal indicative of an interference caused by transmission of the second set of digital signals at a receiver of the communication system is estimated.Type: GrantFiled: September 28, 2021Date of Patent: February 7, 2023Assignee: NOKIA SOLUTIONS AND NETWORKS OYInventors: Marko Fleischer, Jan Hellmann, Rene Röschke, Björn Jelonnek, Jürgen Hellstab
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Patent number: 11476809Abstract: A method comprises obtaining a transmission signal to be power-amplified in a power amplifier (361) prior to transmission; separating the transmission signal into two or more polyphase components of the transmission signal; feeding one or more polyphase components of the transmission signal comprised in the two or more polyphase components to each of two or more parallel predistortion circuits (320,321,322); selecting a dedicated predistortion model and dedicated predistortion coefficients for each of the two or more parallel predistortion circuits (320,321,322); performing non-linear memory-based modeling on the transmission signal according to the selected dedicated predistortion models and coefficients using the one or more polyphase components; and combining output signals of the two or more parallel predistortion circuits (320,321,322) to form a predistorted transmission signal (y[n]) to be applied to the power amplifier (361).Type: GrantFiled: August 11, 2017Date of Patent: October 18, 2022Assignee: NOKIA SOLUTIONS AND NETWORKS OYInventors: Michael Weber, Bjoern Jelonnek, Jan Hellmann
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Publication number: 20220286153Abstract: The present subject matter relates to an apparatus for a communication system. The communication system comprises transmitters being configured to operate in multiple transmission frequency bands. The apparatus comprises means being configured for: capturing a set of over-the-air signals at distinct frequency bands of the multiple transmission frequency bands; aligning in time the set of signals using delays between the set of signals and a received signal at a selected receiver of the communication system; combining the set of aligned signals to generate a composite signal; and estimating an interference signal that is caused by the set of signals at the selected receiver by weighting the composite signal using a set of one or more calibrated parameters for the estimation.Type: ApplicationFiled: September 17, 2019Publication date: September 8, 2022Inventors: Marko FLEISCHER, Helmut HEINZ, Jakub JUCHNIEWICZ, Rene RÖSCHKE, Jan HELLMANN
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Publication number: 20220109462Abstract: An apparatus includes an estimation circuitry configured to receive a first set of one or more digital signals of transmitters of a communication system, and capture a set of one or more radio frequency signals that have been generated from the first set of digital signals The set of radio frequency signals being input of an antenna system of the communication system. Based on the first set of digital signals and the corresponding set of radio frequency signals, a set of weights related to a distortion effect caused by the generation of the radio frequency signals is derived. A received second set of digital signals is weighted using the set of weights, resulting in filtered signals. Using the filtered signals, a correction signal indicative of an interference caused by transmission of the second set of digital signals at a receiver of the communication system is estimated.Type: ApplicationFiled: September 28, 2021Publication date: April 7, 2022Inventors: Marko FLEISCHER, Jan HELLMANN, Rene RÖSCHKE, Björn JELONNEK, Jürgen HELLSTAB
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Patent number: 11284408Abstract: To take into account a passive intermodulation, resource blocks are associated with information indicating passive intermodulation impact of a corresponding resource block. The resource blocks are scheduled using the information.Type: GrantFiled: April 21, 2021Date of Patent: March 22, 2022Assignee: NOKIA SOLUTIONS AND NETWORKS OYInventors: Marko Fleischer, Rene Röschke, Jan Hellmann
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Publication number: 20210345349Abstract: To take into account a passive intermodulation, resource blocks are associated with information indicating passive intermodulation impact of a corresponding resource block. The resource blocks are scheduled using the information.Type: ApplicationFiled: April 21, 2021Publication date: November 4, 2021Inventors: Marko FLEISCHER, Rene RÖSCHKE, Jan HELLMANN
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Patent number: 10897341Abstract: The present invention provides methods, apparatuses and a program relating to detecting passive intermodulation in broadband communication. The present invention includes transmitting, at a base station, a first signal at a first centre frequency and a second signal at a second centre frequency with a predetermined transmit power, capturing, at the base station, received signal at a reception frequency, obtaining, at the base station, a delay between the transmitted signal and a passive intermodulation caused received signal.Type: GrantFiled: July 18, 2012Date of Patent: January 19, 2021Assignee: Nokia Solutions and Networks OyInventors: Marko Fleischer, Michael Kronwald, Thomas Klink, Jan Hellmann, Eric Koenig
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Publication number: 20200186103Abstract: A method comprises obtaining a transmission signal to be power-amplified in a power amplifier (361) prior to transmission; separating the transmission signal into two or more polyphase components of the transmission signal; feeding one or more polyphase components of the transmission signal comprised in the two or more polyphase components to each of two or more parallel predistortion circuits (320,321,322); selecting a dedicated predistortion model and dedicated predistortion coefficients for each of the two or more parallel predistortion circuits (320,321,322); performing non-linear memory-based modeling on the transmission signal according to the selected dedicated predistortion models and coefficients using the one or more polyphase components; and combining output signals of the two or more parallel predistortion circuits (320,321,322) to form a predistorted transmission signal (y[n]) to be applied to the power amplifier (361).Type: ApplicationFiled: August 11, 2017Publication date: June 11, 2020Inventors: Michael WEBER, Bjoern JELONNEK, Jan HELLMANN
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Patent number: 9755673Abstract: The present invention addresses apparatuses, methods and computer program product for providing improved distance to fault measurement for voltage standing wave ratio (VSWR) on antenna line in networks. An embodiment of the present invention comprises the steps of transmitting a signal to a line to be tested, capturing a forward signal of the signal, capturing a reverse signal of the signal, separating the reflection of the signal in time domain via cross correlation of the forward signal and the reverse signal, and detecting a distance to fault in the line by searching and processing maximum peak position of the captured and separated signals.Type: GrantFiled: October 25, 2012Date of Patent: September 5, 2017Assignee: Nokia Solutions and Networks OyInventors: Jan Hellmann, Marko Fleischer, Norbert Hueller, Christian Reichl, Michael Kronwald
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Publication number: 20150358144Abstract: The present invention provides methods, apparatuses and a program relating to detecting passive intermodulation in broadband communication. The present invention includes transmitting, at a base station, a first signal at a first centre frequency and a second signal at a second centre frequency with a predetermined transmit power, capturing, at the base station, received signal at a reception frequency, obtaining, at the base station, a delay between the transmitted signal and a passive intermodulation caused received signal.Type: ApplicationFiled: July 18, 2012Publication date: December 10, 2015Inventors: Marko Fleischer, Michael Kronwald, Thomas Klink, Jan Hellmann, Eric Koenig
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Publication number: 20150295598Abstract: The present invention addresses apparatuses, methods and computer program product for providing improved distance to fault measurement for voltage standing wave ratio (VSWR) on antenna line in networks. An embodiment of he present invention comprises the steps of transmitting a signal to a line to be tested, capturing a forward signal of the signal, capturing a reverse signal of the signal, separating the reflection of the signal in time domain via cross correlation of the forward signal and the reverse signal, and detecting a distance to fault in the line by searching and processing maximum peak position of the captured and separated signals.Type: ApplicationFiled: October 25, 2012Publication date: October 15, 2015Inventors: Jan Hellmann, Marko Fleischer, Norbert Hueller, Christian Reichl, Michael Kronwald