Patents by Inventor Magnus Stig Torsten Sandell

Magnus Stig Torsten Sandell 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: 20180034680
    Abstract: There is provided a device and method for demodulating a pulse amplitude modulated, hereinafter referred to as PAM, signal. The device comprises memory storing a set of boundaries of regions in which the log likelihood ratio, hereinafter referred to as LLR, for each bit to be determined is represented by a linear function of the received signal, along with the properties of the linear function for each bit for each region; and a controller. The controller is configured to: receive a PAM signal to be demodulated; determine which region the signal falls within; for each bit to be determined, retrieve the properties of the linear function for the LLR for the bit within the determined region and determine, from this linear function, the LLR value for the bit; and demodulate the signal based on the determined LLR values.
    Type: Application
    Filed: October 22, 2015
    Publication date: February 1, 2018
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Magnus Stig Torsten SANDELL, Filippo TOSATO, Amr ISMAIL
  • Publication number: 20180013473
    Abstract: In an embodiment, a wireless communication method of transmitting a plurality of data streams from a transmitter to a receiver is disclosed. The transmitter comprises a plurality of antennas.
    Type: Application
    Filed: March 30, 2015
    Publication date: January 11, 2018
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Filippo TOSATO, Magnus Stig Torsten SANDELL
  • Publication number: 20170373742
    Abstract: A method of transmitting a plurality of data streams across a MIMO channel from a transmitter to a receiver, the transmitter comprising an array of antennas, the method comprising acquiring channel state information for a plurality of subcarrier frequencies, determining a mapping that defines, for each frequency, how each data stream is to be mapped to each antenna in the array, and for each antenna in the array, adjusting the power allocated to each data stream that is to be transmitted from the antenna, so as to maximise a measure of throughput; wherein for each data stream, the power allocated to transmitting that data stream at each frequency is greater than or equal to zero, and for each frequency, the power transmitted by any one antenna does not exceed a threshold, and for each data stream, the same power is allocated to each subcarrier used for transmitting that data stream.
    Type: Application
    Filed: February 4, 2015
    Publication date: December 28, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Magnus Stig Torsten SANDELL
  • Publication number: 20170288811
    Abstract: A device for use in demodulating modulated signals by determining a value for a log likelihood ratio. The device has a storage device to store executable instructions and a processor to execute the instructions stored on the memory device.
    Type: Application
    Filed: March 29, 2017
    Publication date: October 5, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Filippo TOSATO, Amr ISMAIL, Magnus Stig Torsten SANDELL
  • Publication number: 20170141828
    Abstract: In an embodiment a method of feeding back channel state information from a beamformee device to a beamformer device is disclosed. The method comprises receiving, at a plurality of antennas of the beamformee device, signals from the beam—former device; constructing a beamforming matrix, the beamforming matrix spanning a vector subspace and indicating the signals received by each of the plurality of antennas of the beamformee device;determining a first feedback matrix that spans the vector sub—space of the beamforming feedback matrix such that it can be compressed with a lower number of non-zero coefficients than the beamforming feedback matrix; compressing the first feedback matrix into a plurality of coefficients; and transmitting an indication of the plurality of coefficients to the beamformer device.
    Type: Application
    Filed: August 8, 2014
    Publication date: May 18, 2017
    Inventors: Filippo TOSATO, Magnus Stig Torsten SANDELL
  • Publication number: 20170111201
    Abstract: In an embodiment a method in an access point of a wireless is disclosed. The wireless network comprises the access point and a plurality of terminals. The method comprises receiving, at a plurality of antennas of the access point, signals from each of the plurality of terminals; estimating, from the received signals, a spatial channel signature for each of the plurality of terminals; selecting, for each terminal of the plurality of terminals, using the spatial channel signatures, a carrier frequency offset tracking pilot signal for that terminal from a plurality of pre-coded pilot signals; and transmitting an indication of the selected carrier frequency offset tracking pilot signals to the respective terminal.
    Type: Application
    Filed: July 7, 2014
    Publication date: April 20, 2017
    Inventors: Magnus Stig Torsten SANDELL, Filippo TOSATO
  • Patent number: 9503287
    Abstract: In an embodiment a method of estimating a sparse signal from a measured signal using a transform matrix is disclosed. The method comprises determining a partial contribution to the sparse signal; determining a residual by subtracting the partial contribution from the measured signal; and iteratively determining further contributions to the sparse signal.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: November 22, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Magnus Stig Torsten Sandell
  • Publication number: 20160294419
    Abstract: In an embodiment a method of generating an erasure code for a network comprising a plurality of nodes, wherein the nodes of the network store data symbols and the number of data symbols stored on a first node of the network is different from the number of data symbols stored on a second node of the network, the erasure code indicating the dependance of parity symbols stored by the nodes of the network on the data symbols such that the data symbols stored on nodes of the network can be determined from parity symbols and data symbols stored on other nodes of the network, comprises determining from the distribution of data symbols among the nodes, an optimal parity symbol distribution;based on the optimal parity symbol distribution and the distribution of data symbols, selecting a code generation method; and generating the erasure code using the selected code generation method.
    Type: Application
    Filed: November 15, 2013
    Publication date: October 6, 2016
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Magnus Stig Torsten SANDELL, Filippo TOSATO
  • Patent number: 9331769
    Abstract: According to one embodiment, antenna allocation or selection in a multi-antenna wireless communications device can be performed at a receiver or an emitter of a wireless communications signal. Selection takes place on the basis of antenna and frequency. Antenna selection in a disclosed embodiment involves a combination of bulk and per tone antenna selection.
    Type: Grant
    Filed: November 2, 2010
    Date of Patent: May 3, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Justin Coon, Magnus Stig Torsten Sandell
  • Publication number: 20160105202
    Abstract: According to an embodiment a decoder for decoding a received set of blocks each comprising a plurality of data symbols and a plurality of parity symbols, wherein the received set of blocks is a subset of a complete set of blocks, the complete set of blocks comprising at least one erased block not included in the received set of blocks comprises storage for a coding matrix which is the kronecker product of a totally non-singular matrix with an anti-diagonal matrix; and a processor operable to determine data symbols of the at least one erased block using the encoding matrix.
    Type: Application
    Filed: May 29, 2013
    Publication date: April 14, 2016
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Filippo TOSATO, Magnus Stig Torsten SANDELL
  • Publication number: 20160043884
    Abstract: In an embodiment a method of estimating a sparse signal from a measured signal using a transform matrix is disclosed. The method comprises determining a partial contribution to the sparse signal; determining a residual by subtracting the partial contribution from the measured signal; and iteratively determining further contributions to the sparse signal.
    Type: Application
    Filed: March 27, 2013
    Publication date: February 11, 2016
    Inventor: Magnus Stig Torsten SANDELL
  • Patent number: 8391390
    Abstract: Channel estimation in a MIMO communications system includes performing a decomposition of an initial channel matrix estimate associated with a first subcarrier of a plurality thereof defined in the channel to identify eigenvectors associated with that subcarrier of the received signal, and defining a first beamforming transformation to be applied to the received signal on the basis of the eigenvectors. For each of the other subcarriers, an additional decomposition is performed in order to determine a further beamforming transformation for each subcarrier. The additional decompositions are carried out incrementally such that information determined in one of said decompositions contributes to a later executed decomposition. Further described is a method of transmitting from a multiple antenna transmitter defining a plurality of subcarriers in space, and time or frequency, comprising the same iterative process.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: March 5, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Vishakan Ponnampalam, Magnus Stig Torsten Sandell
  • Patent number: 8275058
    Abstract: Allocation of subcarriers of a wireless communications channel to antennas for transmission of said subcarriers from a multi-antenna transmitter, comprises selecting, for each subcarrier, the antenna with the most effective transmission performance against a predetermined performance criterion; and determining if subcarriers are evenly distributed amongst said antennas. If even distribution does not arise, then a reallocation sequence is performed. This comprises identifying, for an antenna having excessive subcarriers allocated thereto, the subcarriers allocated thereto and reallocating one of said subcarriers as required, said reallocated subcarrier being selected for reallocation on the basis of its impact on transmission performance.
    Type: Grant
    Filed: January 13, 2009
    Date of Patent: September 25, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Magnus Stig Torsten Sandell, Justin Coon
  • Patent number: 8165231
    Abstract: Precoding a plurality of subcarriers in preparation for MIMO transmission is carried out by deriving preceding matrices from available information. When the number of data streams borne by the subcarriers equates to the number of transmit antennas employed in the MIMO transmission, the method comprises deriving, from respective acquired unitary precoder matrices for two of said subcarriers, interpolated precoder matrices for data streams intermediate the two subcarriers. The acquired and interpolated precoder matrices are then applied, as the case may be, at the respective subcarriers.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: April 24, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Magnus Stig Torsten Sandell
  • Patent number: 8130850
    Abstract: A method and device for managing the use of antennas in a multiple antenna wireless transmission system for OFDM signals. The method includes defining a utility function which comprises a performance metric for transmission. Combinations of antenna and OFDM subcarriers are selected to optimize the utility function under two constraints. The first constraint is that the combinations of antenna and subcarrier include only one antenna for each subcarrier, the second constraint is that the combinations include the same number of subcarriers for each antenna.
    Type: Grant
    Filed: September 22, 2008
    Date of Patent: March 6, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Magnus Stig Torsten Sandell, Justin Coon
  • Publication number: 20110128924
    Abstract: According to one embodiment, antenna allocation or selection in a multi-antenna wireless communications device can be performed at a receiver or an emitter of a wireless communications signal. Selection takes place on the basis of antenna and frequency. Antenna selection in a disclosed embodiment involves a combination of bulk and per tone antenna selection.
    Type: Application
    Filed: November 2, 2010
    Publication date: June 2, 2011
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Justin Coon, Magnus Stig Torsten Sandell
  • Patent number: 7668252
    Abstract: The present invention relates to estimating and correcting for frequency offset errors in wireless receivers, and is particularly but not exclusively related to MIMO WLAN applications. The present invention provides an improved method of tracking receiver frequency offsets in a receiver for MIMO systems. These receiver based frequency offset components are caused by errors or inaccuracies in various receiver sub-systems such as phase lock loops or carrier frequency oscillator error, and sampling clock rate errors. The frequency offsets due to each of a number of receiver sub-systems are estimated by monitoring frequency offsets on a number of channels or subcarriers (such as OFDM pilot channels) on different frequencies. These channel frequency offsets are preferably estimated by detecting the phase rotation between adjacent pilot symbols on each respective channel. They are then weighted according to a quality parameter of the estimates, which corresponds to their accuracy.
    Type: Grant
    Filed: October 31, 2005
    Date of Patent: February 23, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Magnus Stig Torsten Sandell, Darren Phillip McNamara, Steve Carl Jamieson Parker
  • Publication number: 20090202009
    Abstract: Allocation of subcarriers of a wireless communications channel to antennas for transmission of said subcarriers from a multi-antenna transmitter, comprises selecting, for each subcarrier, the antenna with the most effective transmission performance against a predetermined performance criterion; and determining if subcarriers are evenly distributed amongst said antennas. If even distribution does not arise, then a reallocation sequence is performed. This comprises identifying, for an antenna having excessive subcarriers allocated thereto, the subcarriers allocated thereto and reallocating one of said subcarriers as required, said reallocated subcarrier being selected for reallocation on the basis of its impact on transmission performance.
    Type: Application
    Filed: January 13, 2009
    Publication date: August 13, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Magnus Stig Torsten SANDELL, Justin COON
  • Publication number: 20090086836
    Abstract: The invention provides a method and device for managing the use of antennas in a multiple antenna wireless transmission system for OFDM signals. The method includes defining a utility function which comprises a performance metric for transmission. Combinations of antenna and OFDM subcarriers are selected to optimise the utility function under two constraints. The first constraint is that the combinations of antenna and subcarrier include only one antenna for each subcarrier, the second constraint is that the combinations include the same number of subcarriers for each antenna.
    Type: Application
    Filed: September 22, 2008
    Publication date: April 2, 2009
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Magnus Stig Torsten SANDELL, Justin COON
  • Publication number: 20090060074
    Abstract: Precoding a plurality of subcarriers in preparation for MIMO transmission is carried out by deriving preceding matrices from available information. When the number of data streams borne by the subcarriers equates to the number of transmit antennas employed in the MIMO transmission, the method comprises deriving, from respective acquired unitary precoder matrices for two of said subcarriers, interpolated precoder matrices for data streams intermediate the two subcarriers. The acquired and interpolated precoder matrices are then applied, as the case may be, at the respective subcarriers.
    Type: Application
    Filed: August 29, 2008
    Publication date: March 5, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Magnus Stig Torsten SANDELL