Patents by Inventor Vimar Björk

Vimar Björk 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: 8126070
    Abstract: A method and base station for forming an OFDM signal from a baseband signal includes a partitioning unit configured to partition a block of baseband signal samples into sub-blocks. A sub-carrier mapper maps the sub-blocks onto adjacent sub-carrier blocks of an OFDM multi-carrier to form corresponding unprefixed OFDM symbols. A cyclic prefix adder adds a cyclic prefix to each mapped sub-block to form prefixed OFDM symbols. Phase compensations force the unprefixed OFDM symbol part of all subsequently up-converted prefixed OFDM symbols to start at the same phase. Up-converters up-convert the phase compensated prefixed OFDM symbols to respective radio frequency bands having center frequencies and bandwidths that preserve the OFDM multi-carrier structure. A combiner combines the up-converted phase compensated prefixed OFDM symbols into an OFDM signal.
    Type: Grant
    Filed: December 1, 2008
    Date of Patent: February 28, 2012
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Thord Hyllander, Leonard Rexberg, Jacob Österling, Vimar Björk, Tore Mikael André, Torbjörn Gunnar Widhe, Daniel Larsson
  • Publication number: 20110317606
    Abstract: The invention discloses a base station (110, 300) for a cell (105) in a cellular communications system (100). The base station comprises a scheduler (310) for scheduling transmissions to users (115, 120) in the cell (105) and a transmitter with a power amplifier (325). The scheduler (310) is also arranged to set the output power level of the power amplifier (325) for an upcoming transmission period.
    Type: Application
    Filed: March 3, 2009
    Publication date: December 29, 2011
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Jacob Österling, Vimar Björk
  • Publication number: 20110305305
    Abstract: The present solution relates to a method in a first communication node (501) for suppressing noise in a communication system (500) utilizing an automatic gain control. The first communication node (501) receives (1301) a signal from a second communication node (503). Then, the first communication node (501) determines (1302) if a gain level is changed. The signal gain is changed (1303). The next step is for the first communication node (501) to determine (1305) if an inband interferer is present, and then to suppress (1306) transient noise in the signal.
    Type: Application
    Filed: February 22, 2010
    Publication date: December 15, 2011
    Applicant: Tele-Fonaktiebolaget L M Ericsson
    Inventors: Derek Hagen, Vimar Bjork, Claes Rolen
  • Patent number: 8027643
    Abstract: The present invention relates to radio base stations including a standardized interface CPRI between a Radio Equipment (RE) and a Radio Equipment Controller (REC). The present invention also relates to a method. The problem addressed is how to convey calibration information from the RE to the REC, when the capacity is occupied by radio IQ samples. The solution is to suppress the IQ samples to get capacity for the calibration information. Various embodiments of the invention focus on reducing the negative impact the suppression of IQ data may have on detecting the signals received.
    Type: Grant
    Filed: December 3, 2008
    Date of Patent: September 27, 2011
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Jacob Österling, Vimar Björk, Alireza Nejatian
  • Publication number: 20110059711
    Abstract: The present invention relates to a method, an Automatic Gain Control control unit and a receiver for Noise change output signalling. It also relates to an Adjustment Unit, a receiver and a base band detector for adjustment of an Automatic Gain Control output signal on the basis of the Noise change output signalling. In a first step a receiver receives a communication input signal. In a second step at least one Automatic Gain Control attenuator or amplifier in the receiver attenuates the communication input signal. In a third step the receiver produces at least one AGC output signal. In a fourth step at least one AGC control unit in the receiver initiates a changed gain setting on the receiver, when the level of an AGC control unit input signal received by the unit has been below a first threshold level or above a second threshold level during a detection interval.
    Type: Application
    Filed: May 15, 2008
    Publication date: March 10, 2011
    Inventor: Vimar Björk
  • Publication number: 20110038405
    Abstract: A communication method for use in a first cellular communications system is proposed for minimizing the interference caused by strong interfering pulses in the same frequency band as the system or an adjacent frequency band. The method comprises the steps of receiving an incoming signal bandpass filtering the incoming signal to filter out a first frequency band (B1) used by the communications system and forwarding the bandpass filtered signal to a receiver unit (35) for processing and forwarding the processed signal to a signal detector (37) arranged to detect the wanted signal. Redirecting a fraction of the received signal and detecting the power of the redirected fraction. Using the detected power to modify the function of the signal detector (37).
    Type: Application
    Filed: April 8, 2008
    Publication date: February 17, 2011
    Inventors: Johan Axnas, Vimar Bjork, Markus Ringstrom
  • Publication number: 20100136932
    Abstract: The present invention relates to radio base stations including a standardized interface CPRI between a Radio Equipment (RE) and a Radio Equipment Controller (REC). The present invention also relates to a method. The problem addressed is how to convey calibration information from the RE to the REC, when the capacity is occupied by radio IQ samples. The solution is to suppress the IQ samples to get capacity for the calibration information. Various embodiments of the invention focus on reducing the negative impact the suppression of IQ data may have on detecting the signals received.
    Type: Application
    Filed: December 3, 2008
    Publication date: June 3, 2010
    Inventors: Jacob Osterling, Vimar Bjork, Alireza Nejatian
  • Publication number: 20100074349
    Abstract: A method and base station for forming an OFDM signal from a baseband signal includes a partitioning unit configured to partition a block of baseband signal samples into sub-blocks. A sub-carrier mapper maps the sub-blocks onto adjacent sub-carrier blocks of an OFDM multi-carrier to form corresponding unprefixed OFDM symbols. A cyclic prefix adder adds a cyclic prefix to each mapped sub-block to form prefixed OFDM symbols. Phase compensations force the unprefixed OFDM symbol part of all subsequently up-converted prefixed OFDM symbols to start at the same phase. Up-converters up-convert the phase compensated prefixed OFDM symbols to respective radio frequency bands having center frequencies and bandwidths that preserve the OFDM multi-carrier structure. A combiner combines the up-converted phase compensated prefixed OFDM symbols into an OFDM signal.
    Type: Application
    Filed: December 1, 2008
    Publication date: March 25, 2010
    Inventors: Thord Hyllander, Leondard Rexberg, Jacob Osterling, Vimar Bjork, Tore Mikael Andre, Torbjorn Gunnar Widhe, Daniel Larsson
  • Patent number: 6943627
    Abstract: The invention provides robust and non-invasive calibration of an adaptive signal conditioning system having a signal conditioning block in the signal path to a signal conversion system, and a feedback path with a number of feedback components for enabling adaptation, by means of a parameter adaptation block, of the parameters used in the signal conditioning. In order to calibrate the feedback path, a well-defined reference signal is inserted into the feedback path, and an appropriate calibration coefficient is then determined by a coefficient calibrator in response to the received reference signal. The calibration coefficient is provided to a compensator, which effectively compensates for changes in the transfer characteristics of the feedback path due to factors such as variations in ambient temperature and component aging.
    Type: Grant
    Filed: August 9, 2002
    Date of Patent: September 13, 2005
    Assignee: Telefonaktiebolaget Lm Ericsson (publ)
    Inventors: Scott Leyonhjelm, Vimar Björk, John Grass, Lennart Neovius, Paul Leather
  • Publication number: 20040246048
    Abstract: The invention provides robust and non-invasive calibration of an adaptive signal conditioning system having a signal conditioning block in the signal path to a signal conversion system, and a feedback path with a number of feedback components for enabling adaptation, by means of a parameter adaptation block, of the parameters used in the signal conditioning. In order to calibrate the feedback path, a well-defined reference signal is inserted into the feedback path, and an appropriate calibration coefficient is then determined by a coefficient calibrator in response to the received reference signal. The calibration coefficient is provided to a compensator, which effectively compensates for changes in the transfer characteristics of the feedback path due to factors such as variations in ambient temperature and component aging.
    Type: Application
    Filed: February 26, 2004
    Publication date: December 9, 2004
    Inventors: Scott Leyonhjelm, Vimar Bjork, John Grass, Lennart Neovius, Paul Leather