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).

  • Publication number: 20210055374
    Abstract: 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: Application
    Filed: February 26, 2019
    Publication date: February 25, 2021
    Inventors: Sayed Hossein DOKHANCHI, Björn OTTERSTEN, Bhavani Shankar MYSORE RAMA RAO, Thomas STIFTER
  • Publication number: 20200400808
    Abstract: 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: Application
    Filed: March 8, 2019
    Publication date: December 24, 2020
    Inventors: Christian HAMMES, Bhavani Shankar MYSORE RAMA RAO, Björn OTTERSTEN, Udo SCHRÖDER
  • Patent number: 10768291
    Abstract: 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: Grant
    Filed: October 4, 2017
    Date of Patent: September 8, 2020
    Assignees: IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A., UNIVERSITE DU LUXEMBOURG
    Inventors: Christian Hammes, Yogesh Nijsure, Bjorn Ottersten, Udo Schroder
  • Patent number: 10693702
    Abstract: 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: Grant
    Filed: May 23, 2017
    Date of Patent: June 23, 2020
    Assignee: UNIVERSITÉ DU LUXEMBOURG
    Inventors: Farbod Kayhan, Bjorn Ottersten, Bhavani Shankar Mysore Rama Rao
  • Publication number: 20200011968
    Abstract: 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: Application
    Filed: March 1, 2018
    Publication date: January 9, 2020
    Inventors: Christian HAMMES, Yogesh NIJSURE, Bjorn OTTERSTEN, Thiemo SPIELMANN, Bhavani Shankar Mysore Rama Rao, Udo SCHRODER
  • Publication number: 20190346544
    Abstract: 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: Application
    Filed: October 4, 2017
    Publication date: November 14, 2019
    Inventors: Christian HAMMES, Yogesh NIJSURE, Bjorn OTTERSTEN, Udo SCHRODER
  • Publication number: 20190268210
    Abstract: 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: Application
    Filed: May 23, 2017
    Publication date: August 29, 2019
    Applicants: UNIVERSITÉ DU LUXEMBOURG, UNIVERSITÉ DU LUXEMBOURG
    Inventors: Farbod Kayhan, Bjorn Ottersten, Bhavani Shankar Mysore Rama Rao
  • Patent number: 10270520
    Abstract: 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: Grant
    Filed: April 14, 2015
    Date of Patent: April 23, 2019
    Assignee: European Space Agency
    Inventors: 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
  • Patent number: 10033568
    Abstract: 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: Grant
    Filed: July 4, 2014
    Date of Patent: July 24, 2018
    Assignee: SES S.A.
    Inventors: Roberto Piazza, Bhavani Shankar Bysore Rama Rao, Bjorn Ottersten
  • Publication number: 20170163465
    Abstract: 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: Application
    Filed: July 4, 2014
    Publication date: June 8, 2017
    Applicant: SES S.A.
    Inventors: Roberto Piazza, Bhavani Shankar Bysore Rama Rao, Bjorn Ottersten
  • Publication number: 20170149493
    Abstract: 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: Application
    Filed: April 14, 2015
    Publication date: May 25, 2017
    Inventors: 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
  • Patent number: 7474884
    Abstract: 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: Grant
    Filed: September 11, 2006
    Date of Patent: January 6, 2009
    Assignee: Nokia Corporation
    Inventors: Martin Kristensson, Bjorn Ottersten, David Astély
  • Publication number: 20070129042
    Abstract: 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: Application
    Filed: September 11, 2006
    Publication date: June 7, 2007
    Inventors: Martin Kristensson, Bjorn Ottersten, David Astely
  • Patent number: 7107031
    Abstract: 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: Grant
    Filed: May 30, 2001
    Date of Patent: September 12, 2006
    Assignee: Nokia Corporation
    Inventors: Martin Kristensson, Bjorn Ottersten, Astel David
  • Publication number: 20040014424
    Abstract: 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: Application
    Filed: June 19, 2003
    Publication date: January 22, 2004
    Inventors: Martin Kristensson, Bjorn Ottersten, Astel David
  • Patent number: 5642353
    Abstract: 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: Grant
    Filed: June 5, 1995
    Date of Patent: June 24, 1997
    Assignee: Arraycomm, Incorporated
    Inventors: Richard H. Roy, III, Bjorn Ottersten
  • Patent number: 5515378
    Abstract: 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: Grant
    Filed: December 12, 1991
    Date of Patent: May 7, 1996
    Assignee: ArrayComm, Inc.
    Inventors: Richard H. Roy, III, Bjorn Ottersten