Patents by Inventor Mikael Rudberg
Mikael Rudberg 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).
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Patent number: 8676142Abstract: In a radio communication station having antennas an antenna diversity system and a gain controllable amplifier the gain of the gain controllable amplifier is set by using a first antenna, the signal levels of signals received at the antennas is measured, a group of antennas is determined having a signal level which exceeds the signal level of the first antenna by no more than a predetermined value, and out of said group of antennas the antenna with the highest signal level is selected out or the first antenna is selected out if said group is empty.Type: GrantFiled: November 2, 2011Date of Patent: March 18, 2014Assignee: Infineon Technologies AGInventor: Mikael Rudberg
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Publication number: 20120115428Abstract: In a radio communication station having antennas an antenna diversity system and a gain controllable amplifier the gain of the gain controllable amplifier is set by using a first antenna, the signal levels of signals received at the antennas is measured, a group of antennas is determined having a signal level which exceeds the signal level of the first antenna by no more than a predetermined value, and out of said group of antennas the antenna with the highest signal level is selected out or the first antenna is selected out if said group is empty.Type: ApplicationFiled: November 2, 2011Publication date: May 10, 2012Inventor: Mikael Rudberg
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Patent number: 8064862Abstract: In a radio communication station having N antennas an antenna diversity system and a gain controllable amplifier the gain of the gain controllable amplifier is set by using a first antenna, the signal levels of signals received at the antennas is measured, a group of antennas is determined having a signal level which exceeds the signal level of the first antenna by no more than a predetermined value (X), and out of said group of antennas the antenna with the highest signal level is selected out or the first antenna is selected out if said group is empty.Type: GrantFiled: February 25, 2005Date of Patent: November 22, 2011Assignee: Infineon Technologies AGInventor: Mikael Rudberg
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Patent number: 7920660Abstract: To remove DC offset from received data symbols having cyclic prefixes in a data communication system, means (5) are provided for determining the location of the cyclic prefixes, means (3) are provided for calculating the DC offset by calculating a mean value of at least one data symbol without its cyclic prefix and means (4) are provided for subtracting the calculated DC offset from said at least one data symbol with its cyclic prefix.Type: GrantFiled: May 24, 2004Date of Patent: April 5, 2011Assignee: Infineon Technologies Wireless Solutions Sweden ABInventor: Mikael Rudberg
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Patent number: 7643575Abstract: The present invention relates to receiver equipment with AC-coupled receiver circuits and AC coupling filters. A switch connected between a first stage and a second stage among the receiver circuits is adapted to switch from a high coupling corner frequency, for rapid settling of a signal during preparation of data reception, to a low corner frequency, for low signal distortion during data reception. The receiver circuits are adapted to use known properties in the signal to perform the switch at a time when the short term DC-components of the signal are as low as possible.Type: GrantFiled: September 13, 2006Date of Patent: January 5, 2010Assignee: Infineon Technologies AGInventors: Michael Lewis, Mikael Rudberg, Elmar Wagner
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Patent number: 7474883Abstract: A receiver in a radio communication system and method for optimizing a use of an available dynamic range. The receiver has an automatic gain controller in an automatic gain control loop, a first measuring device, connected to the automatic gain controller, operable to measure a total received energy, a second measuring device, connected to the automatic gain controller, operable to measure the inband signal energy, wherein the automatic gain controller is operable to adjust the gain based on both the total received energy and the inband signal energy.Type: GrantFiled: June 6, 2005Date of Patent: January 6, 2009Assignee: Infineon Technologies AGInventor: Mikael Rudberg
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Patent number: 7378998Abstract: Methods, articles of manufacture and systems for the correction of static mismatch errors in D/A converters, where an input word, being the digital representation of an analog input signal, is divided into one most significant part, msb-word, and one least significant part, lsb-word, where msb-word is represented by msb-bits and lsb-word is represented by lsb-bits. Correction is performed by setting the effective weight of the least significant msb-bit to be less than the total sum of all lsb-bits, implementing a first look up table, LUT1, containing the most significant part of the error, so that a corrected msb-word, c-msb-word, would be equal to the msb-word plus a value in LUT1 representing the msb-word, and implementing a second look up table, LUT2, containing the least significant part of the error, so that a first corrected output, c1-output, would be equal to c-msb-word plus a value in LUT2 representing the c-msb-word added to the lsb-word.Type: GrantFiled: October 11, 2006Date of Patent: May 27, 2008Assignee: Infineon Technologies AGInventors: Mikael Rudberg, Jan-Erik Eklund
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Publication number: 20070132616Abstract: Methods, articles of manufacture and systems for the correction of static mismatch errors in D/A converters, where an input word, being the digital representation of an analog input signal, is divided into one most significant part, msb-word, and one least significant part, lsb-word, where msb-word is represented by msb-bits and lsb-word is represented by lsb-bits. Correction is performed by setting the effective weight of the least significant msb-bit to be less than the total sum of all lsb-bits, implementing a first look up table, LUT1, containing the most significant part of the error, so that a corrected msb-word, c-msb-word, would be equal to the msb-word plus a value in LUT1 representing the msb-word, and implementing a second look up table, LUT2, containing the least significant part of the error, so that a first corrected output, c1-output, would be equal to c-msb-word plus a value in LUT2 representing the c-msb-word added to the lsb-word.Type: ApplicationFiled: October 11, 2006Publication date: June 14, 2007Inventors: Mikael Rudberg, Jan-Erik Eklund
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Publication number: 20070071144Abstract: The present invention relates to receiver equipment with AC-coupled receiver circuits and AC coupling filters. A switch connected between a first stage and a second stage among the receiver circuits is adapted to switch from a high coupling corner frequency, for rapid settling of a signal during preparation of data reception, to a low corner frequency, for low signal distortion during data reception. The receiver circuits are adapted to use known properties in the signal to perform the switch at a time when the short term DC-components of the signal are as low as possible.Type: ApplicationFiled: September 13, 2006Publication date: March 29, 2007Inventors: Michael Lewis, Mikael Rudberg, Elmar Wagner
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Publication number: 20050272390Abstract: A receiver in a radio communication system and method for optimizing a use of an available dynamic range. The receiver has an automatic gain controller in an automatic gain control loop, a first measuring device, connected to the automatic gain controller, operable to measure a total received energy, a second measuring device, connected to the automatic gain controller, operable to measure the inband signal energy, wherein the automatic gain controller is operable to adjust the gain based on both the total received energy and the inband signal energy.Type: ApplicationFiled: June 6, 2005Publication date: December 8, 2005Applicant: Infineon Technologies AGInventor: Mikael Rudberg
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Publication number: 20050191982Abstract: In a radio communication station having N antennas an antenna diversity system and a gain controllable amplifier the gain of the gain controllable amplifier is set by using a first antenna, the signal levels of signals received at the antennas is measured, a group of antennas is determined having a signal level which exceeds the signal level of the first antenna by no more than a predetermined value (X), and out of said group of antennas the antenna with the highest signal level is selected out or the first antenna is selected out if said group is empty.Type: ApplicationFiled: February 25, 2005Publication date: September 1, 2005Inventor: Mikael Rudberg
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Publication number: 20040240594Abstract: To remove DC offset from received data symbols having cyclic prefixes in a data communication system, means (5) are provided for determining the location of the cyclic prefixes, means (3) are provided for calculating the DC offset by calculating a mean value of at least one data symbol without its cyclic prefix and means (4) are provided for subtracting the calculated DC offset from said at least one data symbol with its cyclic prefix.Type: ApplicationFiled: May 24, 2004Publication date: December 2, 2004Applicant: Infineon Technologies Wireless Solutions Sweden ABInventor: Mikael Rudberg
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Patent number: 6647067Abstract: In a transmission system which makes use of frequency translated signals, said system having a plurality of lines, a method for reducing crosstalk induced on a signal on a first line of said plurality of lines by a signal on a second line of said plurality of lines, comprising estimating a complex coupling factor for the crosstalk, which when multiplied by the signal on the second line estimates the induced crosstalk; and subtracting the estimated induced crosstalk from the signal on the first line. The invention comprises an approximation method for multiplying the complex coupling factor by the signal on the second line that operates on the signal on the second line through pre-rotation, scaling and multiplication by a complex number according to the coupling factor, said complex number being chosen from a bank of predetermined complex numbers so as to obtain the best approximation possible.Type: GrantFiled: March 28, 2000Date of Patent: November 11, 2003Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Mikael Hjelm, Mikael Rudberg
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Patent number: 6229467Abstract: An analog-to-digital converter (ADC) has a histogram based correction of static errors. In a control and calculating unit (23) of the converter thus the counts of uncorrected digital output codes are stored in a memory (51). From the stored counts a model distribution is determined in a calculation unit, e.g. by estimating an expected gaussian distribution. The model distribution is compared to the measured counts and relative errors of the counts are calculated, the relative errors indicating errors in coarse reference levels. The errors are used for calculating correction terms (L(A)) stored in a correction table (47). The correction terms are used by an output calculating unit (43′) to calculate corrected, more accurate output codes. For a parallel ADC device having several cells, the histograms in the cells can be used to correct for gain and offset errors. Also, the histogram can be used in a built-in self test.Type: GrantFiled: May 30, 2000Date of Patent: May 8, 2001Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Jan-Erik Eklund, Mikael Rudberg