Patents by Inventor Andreas Cedergren

Andreas Cedergren 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: 20090153375
    Abstract: A method is described for adjusting soft values in a code block prior to decoding. A count of saturated soft values in a code block is determined and one or more of the soft values in the code block are adjusted based on the count of saturated soft values. The count may be determined by incrementing the count for each positive saturated soft value and decrementing the count of each negative saturated soft value. The soft values may be adjusted by adding an offset computed based on the count to the soft values.
    Type: Application
    Filed: December 18, 2007
    Publication date: June 18, 2009
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Andreas Cedergren
  • Patent number: 7466658
    Abstract: Coded digital data symbols sent from a transmitter through a transmission channel of a communications network are received in a receiver. An estimate, represented by a first number of bits, of a sent data symbol is calculated, and a second number of bits, lower than the first number, is selected from the estimate to achieve a rounded estimate represented by the second number of bits. The rounded estimate is decoded to achieve a decoded data symbol. A target value for a block error rate of the transmission channel is received from the network; and the second number of bits is selected in dependence on the target block error rate value. Thus an optimal rounded estimate is provided in most situations, and the method can be performed with the limited computational resources of a terminal.
    Type: Grant
    Filed: July 3, 2003
    Date of Patent: December 16, 2008
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Andreas Cedergren, Christer Ostberg, Elias Jonsson, Jonas Linde
  • Publication number: 20080291981
    Abstract: A receiver utilizes pilot channel propagation channel estimates and a signal-to-interference metric derived from the pilot channel to form combining weights for use in obtaining soft symbols from a desired channel for subsequent decoding. The soft symbols thus obtained are substantially independent of the pilot channel amplitude.
    Type: Application
    Filed: May 22, 2007
    Publication date: November 27, 2008
    Inventors: Elias Jonsson, Andreas Cedergren
  • Patent number: 7376195
    Abstract: Methods and apparatus that do not require a memory between the combiner and decision boundary estimator in a digital communications receiver and that enjoy unaltered performance are described. The methods and apparatus include new ways of estimating bit decision boundaries and may also include new ways of estimating soft bit values.
    Type: Grant
    Filed: January 23, 2004
    Date of Patent: May 20, 2008
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Elias Jonsson, Andreas Cedergren
  • Publication number: 20080013603
    Abstract: A method and a receiver for receiving coded digital data symbols sent from a transmitter through a transmission channel of a communications network is adapted to calculate first symbol estimates (y) of sent data symbols from the received data symbols, each of the first symbol estimates (y) having a first bitwidth (a+b), provide a scaling factor (s) and using the scaling factor (s) to scale the first symbol estimates, truncate the scaled symbol estimates (ysc) to a second, lower bitwidth (c) and thereby providing second symbol estimates (yt)
    Type: Application
    Filed: September 20, 2007
    Publication date: January 17, 2008
    Inventors: Andreas Cedergren, Elias Jonsson
  • Publication number: 20080008228
    Abstract: Coded digital data symbols sent through a transmission channel of a communications network are received in a receiver. Estimates (y) represented by a first number (a+b) of bits are calculated, and modified estimates (y?) represented by a second number (c) of bits provided therefrom, the second number being lower than the first number. An amplitude value is calculated for each estimate (y), and an averaged amplitude value calculated for a number of amplitude values. A scaling factor (s) is calculated form the averaged amplitude value, and scaled estimates generated in dependence of die scaling factor. The scaling factor is used for a number of scaled estimates corresponding to the number of amplitude values for which the averaged amplitude value was calculated. Thus a better scaling factor is provided for most channel cases, which can still be calculated with the limited computational resources of a terminal for such networks.
    Type: Application
    Filed: October 21, 2005
    Publication date: January 10, 2008
    Inventors: Andreas Cedergren, Elias Jonsson
  • Patent number: 7154966
    Abstract: A method and system are described for performing fast and simple M-QAM detection on received signals, such as a 16-QAM signal, by estimating M-QAM symbol constellation decision boundaries. Amplitude information is collected for in-phase and quadrature phase components of the received signal over a number of symbols. An average of the absolute value of the amplitude information of the in-phase components and of the quadrature phase components is determined over the number of symbols. The determined average absolute values of the in-phase and quadrature phase components provide a reference to produce the decision boundary estimates. Bias compensation may optionally be applied to the decision boundary estimates based on the estimated signal-to-interference ratio (“SIR”) of the received signal to produce bias corrected decision boundary estimates.
    Type: Grant
    Filed: June 30, 2003
    Date of Patent: December 26, 2006
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Peter Malm, Bengt Lindoff, Andreas Cedergren
  • Publication number: 20060103587
    Abstract: Coded digital data symbols sent from a transmitter through a transmission channel of a communications network are received in a receiver. An estimate, represented by a first number of bits, of a sent data symbol is calculated, and a second number of bits, lower than the first number, is selected from the estimate to achieve a rounded estimate represented by the second number of bits. The rounded estimate is decoded to achieve a decoded data symbol. A target value for a block error rate of the transmission channel is received from the network; and the second number of bits is selected in dependence on the target block error rate value. Thus an optimal rounded estimate is provided in most situations, and the method can be performed with the limited computational resources of a terminal.
    Type: Application
    Filed: July 3, 2003
    Publication date: May 18, 2006
    Inventors: Andreas Cedergren, Christer Ostberg, Elias Jonsson, Jonas Linde
  • Publication number: 20050163200
    Abstract: Methods and apparatus that do not require a memory between the combiner and decision boundary estimator in a digital communications receiver and that enjoy unaltered performance are described. The methods and apparatus include new ways of estimating bit decision boundaries and may also include new ways of estimating soft bit values.
    Type: Application
    Filed: January 23, 2004
    Publication date: July 28, 2005
    Inventors: Elias Jonsson, Andreas Cedergren
  • Publication number: 20040264591
    Abstract: A method and system are described for performing fast and simple M-QAM detection on received signals, such as a 16-QAM signal, by estimating M-QAM symbol constellation decision boundaries. Amplitude information is collected for in-phase and quadrature phase components of the received signal over a number of symbols. An average of the absolute value of the amplitude information of the in-phase components and of the quadrature phase components is determined over the number of symbols. The determined average absolute values of the in-phase and quadrature phase components provide a reference to produce the decision boundary estimates. Bias compensation may optionally be applied to the decision boundary estimates based on the estimated signal-to-interference ratio (“SIR”) of the received signal to produce bias corrected decision boundary estimates.
    Type: Application
    Filed: June 30, 2003
    Publication date: December 30, 2004
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Peter Malm, Bengt Lindoff, Andreas Cedergren