Patents by Inventor Lars Sundstrom

Lars Sundstrom 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).

  • Patent number: 10411927
    Abstract: In a multi-carrier wireless system, potential problems from reconfiguring mobile station resources to accommodate changes in component-carrier configuration are mitigated by inserting a guard period each time the configuration of component carriers changes, so that transceiver reconfiguration can be carried out without interfering with ongoing transmission. A base station is configured to transmit data to a mobile station according to a first configuration of two or more component carriers, to determine that a change of configuration to a second component carrier configuration is required, and to signal the change of configuration to the mobile station, using the first configuration of component carriers. The base station then refrains from transmitting data to the mobile station during a pre-determined guard interval of at least one transmission-time interval subsequent to the signaling of the change of configuration.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: September 10, 2019
    Assignee: Optis Wireless Technology, LLC
    Inventors: Ghyslain Pelletier, Lars Sundstrom
  • Publication number: 20190229678
    Abstract: A crystal oscillator circuit comprises a crystal; oscillator circuitry for generating a crystal oscillation signal at an oscillation frequency; and a kick-start circuit for injecting pulses into the crystal during a start-up period. The oscillator circuitry comprises a differential pair of transistors and can operate in an oscillating mode or a start-up mode. In the oscillating mode, the differential pair of transistors is cross-coupled so that a gate terminal of one transistor is coupled to a drain terminal of the other transistor, and vice versa, and the drain terminals are coupled to the crystal to generate the crystal oscillation signal. In the start-up mode, the kick-start circuit drives the gate terminals of the transistors with said pulses. This crystal oscillator circuit has a decreased start-up time compared to prior art solutions and a reduced influence of parasitic oscillations.
    Type: Application
    Filed: April 4, 2019
    Publication date: July 25, 2019
    Inventors: Anna Karin Stenman, Stefanos Stefanidis, Lars Sundström, Tahmineh Torabian Esfahani
  • Patent number: 10312860
    Abstract: A crystal oscillator circuit comprises a crystal; oscillator circuitry for generating a crystal oscillation signal at an oscillation frequency; and a kick-start circuit for injecting pulses into the crystal during a start-up period. The oscillator circuitry comprises a differential pair of transistors and can operate in an oscillating mode or a start-up mode. In the oscillating mode, the differential pair of transistors are cross-coupled so that a gate terminal of one transistor is coupled to a drain terminal of the other transistor, and vice versa, and the drain terminals are coupled to the crystal to generate the crystal oscillation signal. In the start-up mode, the kick-start circuit drives the gate terminals of the transistors with said pulses. This crystal oscillator circuit has a decreased start-up time compared to prior art solutions and a reduced influence of parasitic oscillations.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: June 4, 2019
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Anna Karin Stenman, Stefanos Stefanidis, Lars Sundström, Tahmineh Torabian Esfahani
  • Publication number: 20190165980
    Abstract: A radio transmitter circuit (10) for transmitting signals within an uplink or sidelink frequency band of a cellular communications system is disclosed. It comprises a signal-generation circuit (20) configured to generate a transmission signal to be transmitted, and a radio front-end circuit (30), connected to the signal-generation circuit (20) at an input of the radio front-end circuit (30), for receiving the transmission signal, and configured to be connected to an antenna (40) at an output of the radio front-end circuit and to transmit the transmission signal to a remote node via said antenna (40). The signal-generation circuit (20) is configured to select a distortion function (D1, D2) based on a location of an allocated radio frequency resource, within said uplink or sidelink frequency band, for the transmission signal. Furthermore, the signal-generation circuit (20) is configured to generate an intermediate transmission signal, based on information to be transmitted in the transmission signal.
    Type: Application
    Filed: October 13, 2016
    Publication date: May 30, 2019
    Inventors: Bengt Lindoff, Shehzad Ali Ashraf, Robert Baldemair, Lars Sundström
  • Patent number: 10306651
    Abstract: A method (20) of scheduling performed by a network node (3) is disclosed. The network node (3) comprises a distributed local oscillator architecture in which elements (181, . . . , 18i, . . . , 18N) of an antenna array (14) have at least partly uncorrelated local oscillator signals, and the network node (3) has wireless connectivity to at least two transmitter nodes (2a, 2b). The method (20) comprises calculating (21) a phase noise value between one or more layers received in each element (181, . . . , 18i, . . . , 18N) from a first transmitter node (2a) and one or more layers received in each element (181, . . . , 18i, . . . , 18N) from a second transmitter node (2b), and determining (22) a scheduling allocation for the at least two transmitter nodes (2a, 2b), taking the calculated phase noise value into account. A network node (3), computer program and computer program product are also provided.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: May 28, 2019
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Lars Sundström, Magnus Åström
  • Publication number: 20190158103
    Abstract: A TI ADC circuit (30) comprises a plurality of L analog inputs (32-1, 32-2, 32-3) and a plurality of L digital outputs (34-1, 34-2, 34-3). The i:th analog input (32-i) is for receiving an i:th analog input signal. The i:th digital output (34-i) is for outputting an i:th digital output signal, which is a digital representation of the i:th analog input signal. TI ADC circuit (30) comprises a set (90) of sub ADCs (100-1-100-K). The TI ADC circuit (30) is configured to generate one sample of each of the L digital output signals per conversion cycle. Each sub ADC (100-1-100-K) is configured to generate a digital output sample in M conversion cycles, wherein M is an integer >1. The number K of sub ADCs in the set (90) of sub ADCs (100-1-100-K) exceeds L·M.
    Type: Application
    Filed: July 8, 2016
    Publication date: May 23, 2019
    Inventors: Lars Sundström, Martin Anderson
  • Publication number: 20190149155
    Abstract: A frequency generation solution controls an oscillator amplitude using two feedback paths to generate high frequency signals with lower power consumption and lower noise. A first feedback path provides continuous control of the oscillator amplitude responsive to an amplitude detected at the oscillator output. A second feedback path provides discrete control of the amplitude regulating parameter(s) of the oscillator responsive to the detected oscillator amplitude. Because the second feedback path enables the adjustment of the amplitude regulating parameter(s), the second feedback path enables an amplifier in the first feedback path to operate at a reduced gain, and thus also at a reduced power and a reduced noise, without jeopardizing the performance of the oscillator.
    Type: Application
    Filed: January 11, 2019
    Publication date: May 16, 2019
    Inventors: Christian Elgaard, Lars Sundström
  • Patent number: 10230482
    Abstract: A radio transceiver circuit for FDD communication is disclosed. It comprises a transmitter for FDD signal transmission in a first frequency band, a first receiver for FDD signal reception in a second frequency band, separate from the first frequency band, and a duplexer. An output port of the transmitter is operatively connected to a first port of the duplexer for transmitting, through the duplexer, signals in said first frequency band. An input port of the first receiver is operatively connected to a second port of the duplexer for receiving, through the duplexer, signals in said second frequency band. The radio transceiver circuit comprises a second receiver, separate from the first receiver, for reception in said first frequency band. An input port of the second receiver is operatively connected to said first port of the duplexer for receiving, through the duplexer, signals in said first frequency band. A related radio communication apparatus is also disclosed.
    Type: Grant
    Filed: July 4, 2017
    Date of Patent: March 12, 2019
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (publ)
    Inventors: Lars Sundstrom, Sven Mattison, Anders Wallen
  • Patent number: 10225742
    Abstract: A method performed by a radio network node for determining a partitioning of a first signal into one or more parts to be transmitted to a first radio node. The radio network node comprises two or more antennas, each associated with a respective radio chain. The radio network node and the radio node operate in a wireless communications network. The radio network node determines a number of radio chains, to be used to send the first signal, and determines a partitioning of the first signal into the one or more parts of the first signal over the determined number of radio chains. The one or more parts are to be transmitted to the first radio node. The radio network node determines the number of radio chains and the partitioning based on a scheduling decision associated with the radio network node, and one or more parameters.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: March 5, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Robert Baldemair, Johan Furuskog, Ning He, Lars Sundström, Karl Werner
  • Patent number: 10218361
    Abstract: A frequency generation solution controls an oscillator amplitude using two feedback paths to generate high frequency signals with lower power consumption and lower noise. A first feedback path provides continuous control of the oscillator amplitude responsive to an amplitude detected at the oscillator output. A second feedback path provides discrete control of the amplitude regulating parameter(s) of the oscillator responsive to the detected oscillator amplitude. Because the second feedback path enables the adjustment of the amplitude regulating parameter(s), the second feedback path enables an amplifier in the first feedback path to operate at a reduced gain, and thus also at a reduced power and a reduced noise, without jeopardizing the performance of the oscillator.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: February 26, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Christian Elgaard, Lars Sundström
  • Publication number: 20180295607
    Abstract: A network node and a wireless device for operation in a wireless communication network, wherein it is determined that a second scheduling bandwidth is needed, based on an amount or type of data buffered for transmission to the wireless device. Reconfiguration of a receiver bandwidth of the wireless device is initiated to match the second scheduling bandwidth, wherein the second scheduling bandwidth is larger than a first scheduling bandwidth currently associated with the wireless device, and wherein the first and second scheduling bandwidths respectively define the bandwidth used for scheduling transmissions to the wireless device. Methods and computer programs therefor are also disclosed.
    Type: Application
    Filed: October 10, 2017
    Publication date: October 11, 2018
    Inventors: Bengt Lindoff, Robert Baldemair, Stefan Parkvall, Lars Sundström
  • Patent number: 10080146
    Abstract: Spatial sensor data, such as position, movement and rotation, which is provided by a sensor in a wireless communication device in a wireless communication system is used. By using the spatial sensor data it is possible to calculate predicted spatial data for use in controlling antenna beams for transmission as well as reception in the wireless communication system.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: September 18, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Lars Sundström, Daniel Araújo, Dennis Hui, Andres Reial
  • Publication number: 20180241402
    Abstract: A frequency generation solution controls an oscillator amplitude using two feedback paths to generate high frequency signals with lower power consumption and lower noise. A first feedback path provides continuous control of the oscillator amplitude responsive to an amplitude detected at the oscillator output. A second feedback path provides discrete control of the amplitude regulating parameter(s) of the oscillator responsive to the detected oscillator amplitude. Because the second feedback path enables the adjustment of the amplitude regulating parameter(s), the second feedback path enables an amplifier in the first feedback path to operate at a reduced gain, and thus also at a reduced power and a reduced noise, without jeopardizing the performance of the oscillator.
    Type: Application
    Filed: May 13, 2016
    Publication date: August 23, 2018
    Inventors: Christian Elgaard, Lars Sundström
  • Publication number: 20180234979
    Abstract: A method (20) of scheduling performed by a network node (3) is disclosed. The network node (3) comprises a distributed local oscillator architecture in which elements (181, . . . , 18i, . . . , 18N) of an antenna array (14) have at least partly uncorrelated local oscillator signals, and the network node (3) has wireless connectivity to at least two transmitter nodes (2a, 2b). The method (20) comprises calculating (21) a phase noise value between one or more layers received in each element (181, . . . , 18i, . . . , 18N) from a first transmitter node (2a) and one or more layers received in each element (181, . . . , 18i, . . . , 18N) from a second transmitter node (2b), and determining (22) a scheduling allocation for the at least two transmitter nodes (2a, 2b), taking the calculated phase noise value into account. A network node (3), computer program and computer program product are also provided.
    Type: Application
    Filed: January 31, 2017
    Publication date: August 16, 2018
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Lars Sundström, Magnus Åström
  • Patent number: 10027352
    Abstract: A radio frequency receiver having a plurality of parallel receiving paths, wherein each path can receive a radio frequency signal in one of a plurality of radio frequency bands and amplify the received signal in a low noise amplifier. The amplified signals from the plurality of parallel paths are combined to one combined radio frequency signal in a common summation node and down-converted to a lower frequency signal in a mixer circuit. Each low noise amplifier comprises a low noise transconductance circuit providing a current signal to drive the common summation node, and an automatic gain control circuit in each path compensates for variations in signal strength independently of signal strengths of signals received by the other receiving paths. The receiver is suitable for simultaneous multiple band reception, where received signal strength can vary between the frequency bands.
    Type: Grant
    Filed: July 17, 2017
    Date of Patent: July 17, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Daniele Mastantuono, Sven Mattisson, Roland Strandberg, Lars Sundström
  • Publication number: 20180198411
    Abstract: A crystal oscillator circuit comprises a crystal (X1); oscillator circuitry (31) for generating a crystal oscillation signal at an oscillation frequency; and a kick-start circuit (12) for injecting pulses into the crystal during a start-up period. The oscillator circuitry (31) comprises a differential pair of transistors (M1, M2) and can operate in an oscillating mode or a start-up mode. In the oscillating mode, the differential pair of transistors are cross-coupled so that a gate terminal of one transistor (M1) is coupled to a drain terminal of the other transistor (M2), and vice versa, and the drain terminals are coupled to the crystal (X1) to generate the crystal oscillation signal. In the start-up mode, the kick-start circuit (12) drives the gate terminals of the transistors (M1, M2) with said pulses. This crystal oscillator circuit has a decreased start-up time compared to prior art solutions and a reduced influence of parasitic oscillations.
    Type: Application
    Filed: March 13, 2015
    Publication date: July 12, 2018
    Inventors: Anna Karin Stenman, Stefanos Stefanidis, Lars Sundström, Tahmineh Torabian Esfahani
  • Publication number: 20180183634
    Abstract: A technique for cancelling or reducing crosstalk signals between controlled oscillators in an integrated circuit is provided. The technique involves an arrangement adapted to reduce a crosstalk signal generated by a first controlled oscillator to a second oscillator both comprised in the integrated circuit, wherein both controlled oscillators are configured to output a respective clock signal. The arrangement comprises a detector adapted to detect the crosstalk signal generated by the first controlled oscillator to the second controlled oscillator, a crosstalk cancellation circuit adapted to generate a cancellation signal having an amplitude substantially the same as that of the crosstalk signal and a phase substantially opposite to that of the crosstalk signal, and a cancellation signal injector adapted to introduce the cancellation signal into the second controlled oscillator.
    Type: Application
    Filed: February 8, 2018
    Publication date: June 28, 2018
    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Fenghao MU, Lars SUNDSTRÖM
  • Patent number: 9998152
    Abstract: A receiver front end arrangement comprises a radio frequency signal input suitable to be connected to an antenna arrangement, a filter bank of non-overlapping band filters associated with respective band for the multi-band reception, a signal conditioning arrangement connected to the filter bank, and a low-noise amplifier arrangement connected to the signal conditioning arrangement. The low-noise amplifier arrangement comprises a path for each band of bands of the multi-band reception. For each path associated with a band for the multi-band reception the low-noise amplifier arrangement comprises a low-noise amplifier. The respective low-noise amplifier has band pass characteristics, or has a band filter connected where the band filter output has a direct connection to the input of the low-noise amplifier, corresponding to a band of the multi-band reception, respectively.
    Type: Grant
    Filed: March 24, 2014
    Date of Patent: June 12, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (publ)
    Inventors: Lars Sundstrom, Daniele Mastantuono, Fenghao Mu
  • Patent number: 9935366
    Abstract: The present invention relates to a wireless communication system node, which comprises an antenna arrangement, with at least one array antenna, each array antenna having a plurality of antenna elements. At least a first set of antenna elements is formed from said plurality of antenna elements. For at least one set of antenna elements, a control unit is arranged to: Form an antenna beam that is steerable to a certain pointing angle in at least one plane for a signal having a certain bandwidth with a certain lowest frequency (flow) and a certain highest frequency (fhigh) Determine the relative power of a received signal at a plurality of frequencies in the frequency band. Determine a degree of angular pointing deviation (?b, ?c) for the antenna beam relative the received signal by means of the degree of slant of the relative power of the received signal.
    Type: Grant
    Filed: April 10, 2014
    Date of Patent: April 3, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Lars Sundström, Lars Manholm
  • Patent number: 9929737
    Abstract: A reference oscillator arrangement is provided for a communication apparatus capable of communicating according to a plurality of transport formats. The reference oscillator arrangement comprises a reference oscillator controller; a resonator core comprising a reference resonator and a driving circuit for the reference resonator, wherein the resonator core is arranged to provide an oscillating signal at a frequency of the reference resonator; and a reference oscillator buffer arrangement, connected to the resonator core, comprising an active circuit arranged to provide a reference oscillator output based on the oscillating signal. The reference oscillator controller is arranged to receive information about an applied transport format and control the driving circuit and/or the active circuit based on the information about the applied transport format. An oscillator arrangement, a communication device, methods therefor and a computer program are also disclosed.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: March 27, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Lars Sundström, Robert Baldemair, Ning He