Patents by Inventor Udo Wachsmann
Udo Wachsmann 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: 9991982Abstract: A technique for cancelling inter-cell or intra-cell interference in a cellular communication network is described. A method implementation of that technique performed in an interfered terminal comprises receiving a signal, wherein the received signal comprises an interfering signal destined to at least one further terminal different from the interfered terminal. In a next step, control information pertaining to the at least one further terminal is determined and the interfering signal is decoded based on the control information so as to generate decoded information. Then, the interfering signal is re-generated from the decoded information and the control information. Based on the re-generated signal the interfering signal is cancelled from the received signal.Type: GrantFiled: January 21, 2013Date of Patent: June 5, 2018Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventors: Udo Wachsmann, Rainer Bachl, Stefan Mueller-Weinfurtner
-
Patent number: 9225476Abstract: A communication device (100) for communicating in accordance with a hybrid automatic repeat request protocol, the communication device (100) comprising a receiving unit (102) adapted for receiving a communication message including soft-bit values, the soft-bit values representing reliability information for received verification data verifying proper transmission of the communication message, a storage unit (104) adapted for storing the soft-bit values, and a storage management unit (106) adapted for dynamically managing storage of the soft-bit values in the storage unit (104) so that soft-bit values failing to fulfill at least one relevance criteria are not maintained in the storage unit (104).Type: GrantFiled: May 13, 2014Date of Patent: December 29, 2015Assignee: UNWIRED PLANET, LLCInventors: Stefan Mueller-Weinfurtner, Steffen Reinhardt, Udo Wachsmann
-
Publication number: 20150358101Abstract: A technique for cancelling inter-cell or intra-cell interference in a cellular communication network is described. A method implementation of that technique performed in an interfered terminal comprises receiving a signal, wherein the received signal comprises an interfering signal destined to at least one further terminal different from the interfered terminal. In a next step, control information pertaining to the at least one further terminal is determined and the interfering signal is decoded based on the control information so as to generate decoded information. Then, the interfering signal is re-generated from the decoded information and the control information. Based on the re-generated signal the interfering signal is cancelled from the received signal.Type: ApplicationFiled: January 21, 2013Publication date: December 10, 2015Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventors: Udo Wachsmann, Rainer Bachl, Stefan Mueller-Weinfurtner
-
Patent number: 8929488Abstract: A technique for processing information in a wireless communication network is described. In a method in accordance with the technique, a signal encoded with a convolution code is received. The encoded signal comprises information and a check value. The encoded signal is decoded using a Viterbi algorithm to derive the information and the check value. The decoding includes computing a Viterbi state metric. A reliability parameter is then determined based on the Viterbi state metric. The information is selectively processed depending on both the check value and the reliability parameter.Type: GrantFiled: May 6, 2010Date of Patent: January 6, 2015Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Stefan Müller-Weinfurtner, Toni Brkic, Udo Wachsmann
-
Publication number: 20140250343Abstract: A communication device (100) for communicating in accordance with a hybrid automatic repeat request protocol, the communication device (100) comprising a receiving unit (102) adapted for receiving a communication message including soft-bit values, the soft-bit values representing reliability information for received verification data verifying proper transmission of the communication message, a storage unit (104) adapted for storing the soft-bit values, and a storage management unit (106) adapted for dynamically managing storage of the soft-bit values in the storage unit (104) so that soft-bit values failing to fulfill at least one relevance criteria are not maintained in the storage unit (104).Type: ApplicationFiled: May 13, 2014Publication date: September 4, 2014Applicant: Unwired Planet, LLCInventors: Stefan MUELLER-WEINFURTNER, Steffen REINHARDT, Udo WACHSMANN
-
Patent number: 8787493Abstract: A technique for precoding a signal to be transmitted over a physical channel from a sender to a receiver is provided. A method includes receiving precoding information and applying precoding matrix at the sender based on the precoding information. The precoding information is received via a feedback mechanism from the receiver. The application of the precoding matrix results in a precoded signal for transmission over the physical channel. The precoding matrix enhances mutual information at the receiver.Type: GrantFiled: August 12, 2011Date of Patent: July 22, 2014Assignee: Telefonaktiebolaget L M Ericsson (Publ)Inventors: Eckhard Ohlmer, Udo Wachsmann
-
Patent number: 8751890Abstract: A communication device (100) for communicating in accordance with a hybrid automatic repeat request protocol, the communication device (100) comprising a receiving unit (102) adapted for receiving a communication message including soft-bit values, the soft-bit values representing reliability information for received verification data verifying proper transmission of the communication message, a storage unit (104) adapted for storing the soft-bit values, and a storage management unit (106) adapted for dynamically managing storage of the soft-bit values in the storage unit (104) so that soft-bit values failing to fulfill at least one relevance criteria are not maintained in the storage unit (104).Type: GrantFiled: December 18, 2008Date of Patent: June 10, 2014Assignee: Unwired Planet, LLCInventors: Stefan Mueller-Weinfurtner, Steffen Reinhardt, Udo Wachsmann
-
Patent number: 8693460Abstract: The invention relates to a technique for controlling a synchronization of a terminal device (10) with a wireless network, e.g. an LTE network, wherein data are transmitted as a continuous data signal on a radio interface (11, 12) while being processed block-wise in the terminal (10). A method embodiment of the technique for achieving at least a downlink (11) synchronization comprises establishing a time-address mapping (TAM, 36) indicative of an association of a reference time value of an internal clock (32) with a reference address in the reception data buffer (16); determining an address of data samples representing the received data block in the reception data buffer (16) based on the time-address mapping; and initiating a block-wise reading of the data block from the reception data buffer (16) based on the determined address.Type: GrantFiled: September 5, 2008Date of Patent: April 8, 2014Assignee: Unwired Planet, LLCInventors: Dietmar Lipka, Stefan Mueller-Weinfurtner, Steffen Reinhardt, Udo Wachsmann
-
Patent number: 8553546Abstract: A technique for determining in a fading channel environment a scaling factor for soft bit quantization is proposed. In a method realisation, the technique includes repeatedly determining an SNR value for the fading channel, calculating a weighted average based on a plurality of the SNR values, wherein weighting is performed such that contributions of extremal SNR values are attenuated, and determining the scaling factor for soft bit quantization dependent on the weighted average.Type: GrantFiled: February 9, 2009Date of Patent: October 8, 2013Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventor: Udo Wachsmann
-
Publication number: 20130188751Abstract: A technique for precoding a signal to be transmitted over a physical channel (102; 206) from a sender to a receiver is provided. As to a method aspect, a method (100) comprises the steps of receiving (104) precoding information and applying (108) a precoding matrix (W) at the sender based on the precoding information. The precoding information is received via a feedback mechanism from the receiver. The application results in a precoded signal (216, 218) for transmission over the physical channel (102; 206). The precoding matrix (W) enhances mutual information (I) at the receiver.Type: ApplicationFiled: August 12, 2011Publication date: July 25, 2013Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventors: Eckhard Ohlmer, Udo Wachsmann
-
Publication number: 20130107993Abstract: A technique for processing information in a wireless communication network is described. In a method in accordance with the technique, a signal encoded with a convolution code is received. The encoded signal comprises information and a check value. The encoded signal is decoded using a Viterbi algorithm to derive the information and the check value. The decoding includes computing a Viterbi state metric. A reliability parameter is then determined based on the Viterbi state metric. The information is selectively processed depending on both the check value and the reliability parameter.Type: ApplicationFiled: May 6, 2010Publication date: May 2, 2013Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventors: Stefan Müller-Weinfurtner, Toni Brkic, Udo Wachsmann
-
Patent number: 8259875Abstract: A technique for determining a frequency offset between components of a communication network based on a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence is described. A method implementation of this technique comprises a provision of a set of correlation signals at different frequencies, with each correlation signal being indicative of a specific frequency offset hypothesis and comprising the CAZAC sequence. Once a synchronization signal comprising the CAZAC sequence is received, this synchronization signal is correlated with each of the correlation signals to obtain a correlation result for each frequency offset hypothesis. In a next step, at least one of the frequency offset hypotheses is selected based on a comparison of the correlation results. The frequency offset may then be determined based on the at least one selected frequency offset hypothesis.Type: GrantFiled: July 16, 2010Date of Patent: September 4, 2012Assignee: Telefonaktiebolaget L M Ericsson (Publ)Inventors: Dietmar Lipka, Stefan Mueller-Weinfurtner, Udo Wachsmann
-
Publication number: 20110276852Abstract: A communication device (100) for communicating in accordance with a hybrid automatic repeat request protocol, the communication device (100) comprising a receiving unit (102) adapted for receiving a communication message including soft-bit values, the soft-bit values representing reliability information for received verification data verifying proper transmission of the communication message, a storage unit (104) adapted for storing the soft-bit values, and a storage management unit (106) adapted for dynamically managing storage of the soft-bit values in the storage unit (104) so that soft-bit values failing to fulfil at least one relevance criteria are not maintained in the storage unit (104).Type: ApplicationFiled: December 18, 2008Publication date: November 10, 2011Inventors: Stefan Mueller-Weinfurtner, Steffen Reinhardt, Udo Wachsmann
-
Publication number: 20110176535Abstract: The invention relates to a technique for controlling a synchronization of a terminal device (10) with a wireless network, e.g. an LTE network, wherein data are transmitted as a continuous data signal on a radio interface (11, 12) while being processed block-wise in the terminal (10). A method embodiment of the technique for achieving at least a downlink (11) synchronization comprises establishing a time-address mapping (TAM, 36) indicative of an association of a reference time value of an internal clock (32) with a reference address in the reception data buffer (16); determining an address of data samples representing the received data block in the reception data buffer (16) based on the time-address mapping; and initiating a block-wise reading of the data block from the reception data buffer (16) based on the determined address.Type: ApplicationFiled: September 5, 2008Publication date: July 21, 2011Inventors: Dietmar Lipka, Stefan Mueller-Weinfurtner, Steffen Reinhardt, Udo Wachsmann
-
Publication number: 20110134980Abstract: A technique for controlling a gain of a receiver is provided. A method implementation of this technique comprises the steps of receiving at least one signal, initially controlling the gain of the receiver based on a correlation value of a first part of the received signal having a substantially constant signal strength, determining at least one timing-related parameter of the received signal based on the at least first part, identifying based on the at least one timing-related parameter at least a second part of the received signal having a substantially constant signal strength and further controlling the gain of the receiver based on a measured signal strength of the identified second part.Type: ApplicationFiled: May 8, 2009Publication date: June 9, 2011Inventors: Dietmar Lipka, Stefan Mueller-Weinfurtner, Udo Wachsmann
-
Publication number: 20110026649Abstract: A technique for determining a frequency offset between components of a communication network based on a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence is described. A method implementation of this technique comprises a provision of a set of correlation signals at different frequencies, with each correlation signal being indicative of a specific frequency offset hypothesis and comprising the CAZAC sequence. Once a synchronization signal comprising the CAZAC sequence is received, this synchronization signal is correlated with each of the correlation signals to obtain a correlation result for each frequency offset hypothesis. In a next step, at least one of the frequency offset hypotheses is selected based on a comparison of the correlation results. The frequency offset may then be determined based on the at least one selected frequency offset hypothesis.Type: ApplicationFiled: July 16, 2010Publication date: February 3, 2011Inventors: Dietmar Lipka, Stefan Mueller-Weinfurtner, Udo Wachsmann
-
Publication number: 20100309810Abstract: A technique for determining in a fading channel environment a scaling factor for soft bit quantization is proposed. In a method realisation, the technique includes repeatedly determining an SNR value for the fading channel, calculating a weighted average based on a plurality of the SNR values, wherein weighting is performed such that contributions of extremal SNR values are attenuated, and determining the scaling factor for soft bit quantization dependent on the weighted average.Type: ApplicationFiled: February 9, 2009Publication date: December 9, 2010Inventor: Udo Wachsmann
-
Patent number: 7826342Abstract: The present invention concerns a method for estimating the time-dispersion of a channel comprising D subchannels, wherein one computes from a received signal a set of estimated Channel Transfer Factors (CTF's) ?[?], where ?(0???D) is the subchannel number, said method comprising a step of calculating, for a predetermined strictly positive integer d, a correlation factor Cd representing the correlations, both in amplitude and in phase, between pairs ?[?] and ?[?+d] of said computed CTF estimates. By an appropriate choice of d, the time-dispersion resolution can be adapted to most prevalent channels. The correlation is optionally corrected according to the mean channel estimation signal-to-noise ratio. This method can be used for many applications where knowing the time-dispersion characteristics of a channel is required, and is, for example, particularly suitable for designing a channel estimation filter, and for link adaptation. Application to devices and apparatus implementing these methods.Type: GrantFiled: January 15, 2003Date of Patent: November 2, 2010Assignee: Telefonaktiebolaget LM EricssonInventors: Stefan Mueller-Weinfurtner, Peter Schramm, Udo Wachsmann
-
Patent number: 7760834Abstract: A method and a device of providing timing information within a wireless communication system is described. The timing information is extracted from a received transmit signal. The inventive method comprises the steps of providing a training signal on the receiver side relating to a known signal portion of the transmit signal, scaling the training signal, quantizing the scaled training signal, correlating one or more parts of the received transmit signal with the scaled training signal to obtain one or more correlation results, and determining the timing information on the basis of the correlation results.Type: GrantFiled: December 12, 2007Date of Patent: July 20, 2010Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Fabian Wenger, Uwe Dettmar, Udo Wachsmann, Peter Schramm
-
Patent number: 7729460Abstract: A method and a device of providing timing information within a wireless communication system is described. The timing information is extracted from a received transmit signal. The inventive method comprises the steps of providing a training signal on the receiver side relating to a known signal portion of the transmit signal, scaling the training signal, quantizing the scaled training signal, correlating one or more parts of the received transmit signal with the scaled training signal to obtain one or more correlation results, and determining the timing information on the basis of the correlation results.Type: GrantFiled: December 12, 2007Date of Patent: June 1, 2010Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Fabian Wenger, Uwe Dettmar, Udo Wachsmann, Peter Schramm