Patents by Inventor Bjorn Ottersten
Bjorn Ottersten 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: 11808877Abstract: A method and system for joint radar communication for automotive applications. The system carries out the method and includes a transmitter transmitting a radar signal, which signal has a phase-modulated continuous waveform and includes information encoded by phase modulation, a receiver, spaced from the transmitter, receiving the signal, and the receiver detecting the information from the received signal. In order to provide an efficient concept for joint radar-communication for automotive applications, the signal is a multi-carrier phase-modulated continuous waveform having a plurality of carrier frequencies and the information is encoded onto each carrier frequency.Type: GrantFiled: February 26, 2019Date of Patent: November 7, 2023Assignees: IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A., UNIVERSITÉ DU LUXEMBOURGInventors: Sayed Hossein Dokhanchi, Björn Ottersten, Bhavani Shankar Mysore Rama Rao, Thomas Stifter
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Patent number: 11415664Abstract: A method for obtaining an adaptive angle-Doppler ambiguity function (AF) for a target using multiple-input-multiple-output (MIMO) radar that includes a transmit antenna array having a plurality of antenna elements. The method includes generating transmit signals for transmission by the transmit antenna array, the transmit signals defining at least a first transmit trajectory of a phase center within the transmit antenna array; transmitting the transmit signals using the transmit antenna array and receiving receive signals from the target, the receive signals resulting from the incidence of the transmit signals upon the target; and obtaining at least an angle-Doppler ambiguity function (AF) from the receive signals. The first transmit trajectory is such that, in operation, the phase center undergoes random phase center motion (PCM), such that a phase center position within the transmit antenna array varies randomly with time. A system for obtaining an AF is also disclosed.Type: GrantFiled: March 1, 2018Date of Patent: August 16, 2022Assignees: IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A., UNIVERSITE DU LUXEMBOURGInventors: Christian Hammes, Yogesh Nijsure, Bjorn Ottersten, Thiemo Spielmann, Bhavani Shankar Mysore Rama Rao, Udo Schroder
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Publication number: 20210055374Abstract: A method and system for joint radar communication for automotive applications. The system carries out the method and includes a transmitter transmitting a radar signal, which signal has a phase-modulated continuous waveform and includes information encoded by phase modulation, a receiver, spaced from the transmitter, receiving the signal, and the receiver detecting the information from the received signal. In order to provide an efficient concept for joint radar-communication for automotive applications, the signal is a multi-carrier phase-modulated continuous waveform having a plurality of carrier frequencies and the information is encoded onto each carrier frequency.Type: ApplicationFiled: February 26, 2019Publication date: February 25, 2021Inventors: Sayed Hossein DOKHANCHI, Björn OTTERSTEN, Bhavani Shankar MYSORE RAMA RAO, Thomas STIFTER
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Publication number: 20200400808Abstract: A method of sensing a target in a target detection system having processing circuitry and a multiplexer coupled to the processing circuitry and to a plurality NT of transmit antennas forming a sparse transmit uniform linear array (ULA), the multiplexer being configured to generate multiplexed and phase modulated transmit signals (T1 . . . TNT) based on signals from a local oscillator. The processing circuitry receives signals via a plurality NR of receive antennas forming a dense receive ULA. The method includes transmitting the transmit signals via the transmit antennas as a general radiation pattern corresponding to a block circulant probing signal matrix, and receiving via the receive antennas receive signals resulting from backscattering of the transmit signals transmitted towards K targets. The method further includes processing the received reflection signals to determine the presence, range and/or angular position of a target within a field of view of the transmit antennas.Type: ApplicationFiled: March 8, 2019Publication date: December 24, 2020Inventors: Christian HAMMES, Bhavani Shankar MYSORE RAMA RAO, Björn OTTERSTEN, Udo SCHRÖDER
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Patent number: 10768291Abstract: A method for obtaining an angle-Doppler signature for a target using sparse arrays in multiple-input-multiple-output (MIMO) radar, the MIMO radar including a transmit antenna array, the transmit antenna array being at least one-dimensional (e.g. 2-D, 3-D or 4-D) and having a plurality of antenna elements. The method includes generating transmit signals for transmission by the transmit antenna array, the transmit signals defining at least a first transmit trajectory (e.g. circular) of a phase center within the transmit antenna array, and transmitting the transmit signals using Amplitude Modulation on the transmit antenna array. The method further includes receiving receive signals from the target, the receive signals resulting from the incidence of the transmit signals upon the target, and determining the angle-Doppler signature from the receive signals. The first transmit trajectory is such that, in operation, the phase center undergoes non-linear motion within the transmit antenna array.Type: GrantFiled: October 4, 2017Date of Patent: September 8, 2020Assignees: IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A., UNIVERSITE DU LUXEMBOURGInventors: Christian Hammes, Yogesh Nijsure, Bjorn Ottersten, Udo Schroder
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Patent number: 10693702Abstract: A simple construction for a family of non-uniform APSK constellations by the radial isomorphism between squares to circles is provided. The mutual information values indicate gains of at least 0.5 dB up to 1.5 dB with respect to the state of the art, such as the DVB-S2X constellations with 256 symbols. The invention also provides for a low-complexity detector of high-order modulated signals.Type: GrantFiled: May 23, 2017Date of Patent: June 23, 2020Assignee: UNIVERSITÉ DU LUXEMBOURGInventors: Farbod Kayhan, Bjorn Ottersten, Bhavani Shankar Mysore Rama Rao
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Publication number: 20200011968Abstract: A method for obtaining an adaptive angle-Doppler ambiguity function (AF) for a target using multiple-input-multiple-output (MIMO) radar that includes a transmit antenna array having a plurality of antenna elements. The method includes generating transmit signals for transmission by the transmit antenna array, the transmit signals defining at least a first transmit trajectory of a phase center within the transmit antenna array; transmitting the transmit signals using the transmit antenna array and receiving receive signals from the target, the receive signals resulting from the incidence of the transmit signals upon the target; and obtaining at least an angle-Doppler ambiguity function (AF) from the receive signals. The first transmit trajectory is such that, in operation, the phase center undergoes random phase center motion (PCM), such that a phase center position within the transmit antenna array varies randomly with time. A system for obtaining an AF is also disclosed.Type: ApplicationFiled: March 1, 2018Publication date: January 9, 2020Inventors: Christian HAMMES, Yogesh NIJSURE, Bjorn OTTERSTEN, Thiemo SPIELMANN, Bhavani Shankar Mysore Rama Rao, Udo SCHRODER
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Publication number: 20190346544Abstract: A method for obtaining an angle-Doppler signature for a target using sparse arrays in multiple-input-multiple-output (MIMO) radar, the MIMO radar including a transmit antenna array, the transmit antenna array being at least one-dimensional (e.g. 2-D, 3-D or 4-D) and having a plurality of antenna elements. The method includes generating transmit signals for transmission by the transmit antenna array, the transmit signals defining at least a first transmit trajectory (e.g. circular) of a phase center within the transmit antenna array, and transmitting the transmit signals using Amplitude Modulation on the transmit antenna array. The method further includes receiving receive signals from the target, the receive signals resulting from the incidence of the transmit signals upon the target, and determining the angle-Doppler signature from the receive signals. The first transmit trajectory is such that, in operation, the phase center undergoes non-linear motion within the transmit antenna array.Type: ApplicationFiled: October 4, 2017Publication date: November 14, 2019Inventors: Christian HAMMES, Yogesh NIJSURE, Bjorn OTTERSTEN, Udo SCHRODER
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Publication number: 20190268210Abstract: A simple construction for a family of non-uniform APSK constellations by the radial isomorphism between squares to circles is provided. The mutual information values indicate gains of at least 0.5 dB up to 1.5 dB with respect to the state of the art, such as the DVB-S2X constellations with 256 symbols. The invention also provides for a low-complexity detector of high-order modulated signals.Type: ApplicationFiled: May 23, 2017Publication date: August 29, 2019Applicants: UNIVERSITÉ DU LUXEMBOURG, UNIVERSITÉ DU LUXEMBOURGInventors: Farbod Kayhan, Bjorn Ottersten, Bhavani Shankar Mysore Rama Rao
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Patent number: 10270520Abstract: A, method and apparatus for wirelessly transmitting data to a plurality of terminals in each of a plurality of beams through a plurality of transmit feeds includes selecting, for each beam, two or more terminals among the plurality of terminals in the beam as a subgroup of terminals, on the basis of channel state information of the plurality of terminals; determining, for each beam, equivalent channel state information representing the subgroup of terminals in the beam on the basis of the channel state information of the terminals of at least one of the plural subgroups of terminals; and determining a set of weight coefficients that relate the plurality of transmit feeds to a plurality of signals that are intended for transmission in the plurality of beams on the basis of the equivalent channel state information representing the plural subgroups of terminals.Type: GrantFiled: April 14, 2015Date of Patent: April 23, 2019Assignee: European Space AgencyInventors: Pantelis-Daniel Arapoglou, Alberto Ginesi, Giorgio Taricco, Dimitrios Christopoulos, Symeon Chatzinotas, Bjorn Ottersten, Miguel Angel Vazquez, Ana Isabel Perez-Neira, Stefano Andrenacci, Alessandro Vanelli Coralli
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Patent number: 10033568Abstract: A method, carried out by a gateway transmitter (400), aims at compensating the nonlinearities of a communication channel (500) comprising a repeater (510). A plurality of digital signals is modulated (s10) on a plurality of carriers, wherein symbols of the constellation diagram used for modulation of each carrier are distorted in accordance with a pre-distortion function. The modulated signals are then frequency division multiplexed (s20), and sent (s30) for transmission, through the communication channel (500), to at least one receiver (600). The pre-distortion function involves a plurality of polynomial functions, each of which taking as input the symbols from all the carriers. The polynomial functions' coefficients, called “pre-distortion coefficients”, are computed according to a direct learning approach, performed jointly for the plurality of carriers. The pre-distortion coefficients are iteratively updated based on received signals being fed back from a receiver (600).Type: GrantFiled: July 4, 2014Date of Patent: July 24, 2018Assignee: SES S.A.Inventors: Roberto Piazza, Bhavani Shankar Bysore Rama Rao, Bjorn Ottersten
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Publication number: 20170163465Abstract: A method, carried out by a gateway transmitter (400), aims at compensating the nonlinearities of a communication channel (500) comprising a repeater (510). A plurality of digital signals is modulated (s10) on a plurality of carriers, wherein symbols of the constellation diagram used for modulation of each carrier are distorted in accordance with a pre-distortion function. The modulated signals are then frequency division multiplexed (s20), and sent (s30) for transmission, through the communication channel (500), to at least one receiver (600). The pre-distortion function involves a plurality of polynomial functions, each of which taking as input the symbols from all the carriers. The polynomial functions' coefficients, called “pre-distortion coefficients”, are computed according to a direct learning approach, performed jointly for the plurality of carriers. The pre-distortion coefficients are iteratively updated based on received signals being fed back from a receiver (600).Type: ApplicationFiled: July 4, 2014Publication date: June 8, 2017Applicant: SES S.A.Inventors: Roberto Piazza, Bhavani Shankar Bysore Rama Rao, Bjorn Ottersten
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Publication number: 20170149493Abstract: A, method and apparatus for wirelessly transmitting data to a plurality of terminals in each of a plurality of beams through a plurality of transmit feeds includes selecting, for each beam, two or more terminals among the plurality of terminals in the beam as a subgroup of terminals, on the basis of channel state information of the plurality of terminals; determining, for each beam, equivalent channel state information representing the subgroup of terminals in the beam on the basis of the channel state information of the terminals of at least one of the plural subgroups of terminals; and determining a set of weight coefficients that relate the plurality of transmit feeds to a plurality of signals that are intended for transmission in the plurality of beams on the basis of the equivalent channel state information representing the plural subgroups of terminals.Type: ApplicationFiled: April 14, 2015Publication date: May 25, 2017Inventors: Pantelis-Daniel Arapoglou, Alberto Ginesi, Giorgio Taricco, Dimitrios Christopoulos, Symeon Chatzinotas, Bjorn Ottersten, Miguel Angel Vazquez, Ana Isabel Perez-Neira, Stefano Andrenacci, Alessandro Vanelli Coralli
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Patent number: 7474884Abstract: The present invention relates to a method for a digital receiver and a receiver exploiting second order statistics for adaptive co-channel interference rejection in wireless communication. It uses digitally I, in phase, and Q, quadrature, branches of a received transmitted signal as input to the receiver, a coarse synchronization and a coarse frequency offset compensation have being performed on the signal. It comprises a means for derotation, means for separation, means for filtering, means for estimating and means for detecting transmitted symbols in the received signal. The invention thereby improving co-channel rejection in wireless communication, thus making it possible to increase the number of communication channels for frequencies used.Type: GrantFiled: September 11, 2006Date of Patent: January 6, 2009Assignee: Nokia CorporationInventors: Martin Kristensson, Bjorn Ottersten, David Astély
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Publication number: 20070129042Abstract: The present invention relates to a method for a digital receiver and a receiver exploiting second order statistics for adaptive co-channel interference rejection in wireless communication. It uses digitally I, in phase, and Q, quadrature, branches of a received transmitted signal as input to the receiver, a coarse synchronization and a coarse frequency offset compensation have being performed on the signal. It comprises a means for derotation, means for separation, means for filtering, means for estimating and means for detecting transmitted symbols in the received signal. The invention thereby improving co-channel rejection in wireless communication, thus making it possible to increase the number of communication channels for frequencies used.Type: ApplicationFiled: September 11, 2006Publication date: June 7, 2007Inventors: Martin Kristensson, Bjorn Ottersten, David Astely
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Patent number: 7107031Abstract: The present invention relates to a method for a digital receiver and a receiver exploiting second order statistics for adaptive co-channel interference rejection in wireless communication. It uses digitally I, in phase, and Q, quadrature, branches of a received transmitted signal as input to the receiver, a coarse synchronization and a coarse frequency offset compensation have being performed on the signal. It comprises a means for derotation, means for separation, means for filtering, means for estimating and means for detecting transmitted symbols in the received signal. The invention thereby improving co-channel rejection in wireless communication, thus making it possible to increase the number of communication channels for frequencies used.Type: GrantFiled: May 30, 2001Date of Patent: September 12, 2006Assignee: Nokia CorporationInventors: Martin Kristensson, Bjorn Ottersten, Astel David
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Publication number: 20040014424Abstract: The present invention relates to a method for a digital receiver and a receiver exploiting second order statistics for adaptive co-channel interference rejection in wireless communication. It uses digitally I, in phase, and Q, quadrature, branches of a received transmitted signal as input to the receiver, a coarse synchronization and a coarse frequency offset compensation have being performed on the signal. It comprises a means for derotation, means for separation, means for filtering, means for estimating and means for detecting transmitted symbols in the received signal. The invention thereby improving co-channel rejection in wireless communication, thus making it possible to increase the number of communication channels for frequencies used.Type: ApplicationFiled: June 19, 2003Publication date: January 22, 2004Inventors: Martin Kristensson, Bjorn Ottersten, Astel David
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Patent number: 5642353Abstract: A method and apparatus for increasing the capacity and quality of wireless communication between a plurality of remote users and a base station is disclosed. Using measurements from an array of receiving antennas at the base station, parameters of multiple signals transmitted to the base station from a plurality of users in the same channel are calculated and used to obtain the positions and velocities of the users. The locations and other related signal parameters are used to calculate appropriate spatial demultiplexing strategies, reconstructing the individual transmitted signals from the receiver measurements and reducing interference to acceptable levels. This heretofore unavailable location information is used in solving the hand-off problem. This information is also used to calculate an appropriate spatial multiplexing strategy for simultaneous transmission of signals to users in the same channel. This can be the same as or distinct from the aforementioned receive channel.Type: GrantFiled: June 5, 1995Date of Patent: June 24, 1997Assignee: Arraycomm, IncorporatedInventors: Richard H. Roy, III, Bjorn Ottersten
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Patent number: 5515378Abstract: A method and apparatus for increasing the capacity and quality of wireless communication between a plurality of remote users and a base station is disclosed. Using measurements from an array of receiving antennas at the base station, parameters of multiple signals transmitted to the base station from a plurality of users in the same channel are calculated and used to obtain the positions and velocities of the users. The locations and other related signal parameters are used to calculate appropriate spatial demultiplexing strategies, reconstructing the individual transmitted signals from the receiver measurements and reducing interference to acceptable levels. This heretofore unavailable location information is used in solving the hand-off problem. This information is also used to calculate an appropriate spatial multiplexing strategy for simultaneous transmission of signals to users in the same channel. This can be the same as or distinct from the aforementioned receive channel.Type: GrantFiled: December 12, 1991Date of Patent: May 7, 1996Assignee: ArrayComm, Inc.Inventors: Richard H. Roy, III, Bjorn Ottersten