Patents by Inventor Gerhard Guenter Theodor Kramer
Gerhard Guenter Theodor Kramer 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: 8830812Abstract: Techniques are disclosed for compensating for crosstalk using adaptation of data signals transmitted over respective channels of a communication network. In one example, a method comprises the following steps. Data is transmitted to a communication network device via a communication line during a sequence of periods. For each period of the sequence of periods, a separate value of a measure of crosstalk that was measured at the communication network device is received, each value being an average of measurements at the device of measures of crosstalk for a plurality of communication network signal subcarriers. For each individual signal subcarrier of the plurality, a matrix is updated based on the received values, the matrix being configured to precode data transmissions to the communication network device over the individual signal subcarrier. The communication network may be a DSL system, the signal subcarriers may be DSL tones, and the measure of crosstalk may be a SINR value.Type: GrantFiled: August 25, 2008Date of Patent: September 9, 2014Assignee: Alcatel LucentInventors: Alexei E. Ashikhmin, Adriaan J. De Lind Van Wijngaarden, Gerhard Guenter Theodor Kramer, Jochen Maes, Carl Jeremy Nuzman, Carl Robert Posthuma, Danny Van Bruyssel, Jan S. Verlinden, Philip Alfred Whiting, Miroslav Zivkovic
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Patent number: 8300518Abstract: At least one channel is joined to a group of active channels in a communication system by transmitting control signals to configure respective customer premises equipment (CPE) of the active channels into a joining mode of operation, and transmitting a joining signature sequence to CPE of the joining channel over a downstream data signal path of the joining channel. A central office (CO) or other access node of the system receives correlation results from respective active channel CPE, estimates crosstalk from the joining channel into the active channels based on the correlation results, configures a precoder based on the estimated crosstalk, and adds the joining channel to the group of active channels. The channels may comprise respective subscriber lines of a DSL communication system.Type: GrantFiled: April 1, 2008Date of Patent: October 30, 2012Assignee: Alcatel LucentInventors: Alexei Ashikhmin, Adriaan J. De Lind Van Wijngaarden, Gerhard Guenter Theodor Kramer, Carl Jeremy Nuzman, Philip Alfred Whiting
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Patent number: 8300726Abstract: Techniques are disclosed that efficiently obtain channel crosstalk estimates in DSL systems and other communication systems that may include unsynchronized channels. For example, a method includes obtaining a first set of estimated measures of crosstalk for a first portion of a plurality of communication channels over which data signals are to be transmitted from a transmitter to a plurality of receivers, and interpolating a second set of estimated measures of crosstalk for a second portion of the plurality of communication channels based on the first set of estimated measures of crosstalk. The first portion of the plurality of communication channels may be a subset of the plurality of communication channels and the second portion of the plurality of communication channels is a remainder of the plurality of communication channels. Each estimated measure of crosstalk may relate to at least one tone associated with at least one of the plurality of communication channels.Type: GrantFiled: November 2, 2007Date of Patent: October 30, 2012Assignee: Alcatel LucentInventors: Alexei Ashikhmin, Adriaan J. De Lind Van Wijngaarden, Gerhard Guenter Theodor Kramer, Philip Alfred Whiting, Miroslav Zivkovic
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Patent number: 8243578Abstract: An access node of a communication system comprises a plurality of transmitters adapted for communication with at least one receiver. The access node is operative to simultaneously estimate channel coefficients between multiple ones of the transmitters and the receiver, and to utilize the estimated channel coefficients to control at least one data signal sent by at least one of the multiple transmitters to the receiver. In the process of simultaneously estimating the channel coefficients, the access node transmits a plurality of distinct probing signals generated based on respective ones of a plurality of different frequency expansions. For example, each of the distinct probing signals may be generated based on a distinct combination of a common probing sequence and a selected one of the plurality of different frequency expansions.Type: GrantFiled: May 5, 2009Date of Patent: August 14, 2012Assignee: Alcatel LucentInventors: Gerhard Guenter Theodor Kramer, Carl Jeremy Nuzman
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Patent number: 8218419Abstract: An access node of a communication system comprises a plurality of transmitters adapted for communication with at least one receiver. The access node is operative to simultaneously estimate channel coefficients between multiple ones of the transmitters and the receiver, and to utilize the estimated channel coefficients to control at least one data signal sent by at least one of the multiple transmitters to the receiver. In the process of simultaneously estimating the channel coefficients, the access node transmits a plurality of distinct probing signals, each of which is generated based on a distinct combination of a common probing sequence and a selected one of a plurality of different frequency expansions. The access node may comprise at least a portion of at least one central office of a DSL communication system.Type: GrantFiled: February 12, 2009Date of Patent: July 10, 2012Assignee: Alcatel LucentInventors: Gerhard Guenter Theodor Kramer, Carl Jeremy Nuzman
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Patent number: 8081560Abstract: Techniques are disclosed for compensating for crosstalk using adaptation of data signals transmitted over respective channels of a communication system. For example, a method includes the following steps. A first set of estimated measures of crosstalk is obtained for at least a selected portion of a plurality of communication channels over which data signals are to be transmitted from a transmitter to at least a selected portion of a plurality of receivers. A first set of data signals based on the first set of estimated measures of crosstalk is adapted to generate a first set of adjusted data signals. The first set of adjusted data signals is transmitted to corresponding ones of the plurality of receivers. A second set of estimated measures of crosstalk is obtained for the selected portion of the plurality of communication channels. A second set of data signals for transmission based on the second set of estimated measures of crosstalk is adapted to generate a second set of adjusted data signals.Type: GrantFiled: August 31, 2007Date of Patent: December 20, 2011Assignee: Alcatel LucentInventors: Adriaan J. De Lind Van Wijngaarden, Gerhard Guenter Theodor Kramer, Carl J. Nuzman, Philip Alfred Whiting, Miroslav Zivkovic
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Patent number: 7860044Abstract: A multi-channel processing module is arranged in series with multiple channels of a communication system. The processing module synchronizes downstream symbols among the channels, and synchronizes downstream symbols for at least a given one of the channels with upstream symbols for that channel. The synchronization of downstream symbols among the channels and the synchronization of downstream symbols for at least the given channel with upstream symbols for that channel are collectively achieved by adjusting downstream and upstream adjustable delay elements associated with respective downlink and uplink signal paths in the multi-channel processing module. The channels may comprise respective subscriber lines of a DSL communication system.Type: GrantFiled: May 30, 2008Date of Patent: December 28, 2010Assignee: Alcatel-Lucent USA Inc.Inventors: Alexei E. Ashikhmin, Hungkei Keith Chow, Adriaan J. De Lind Van Wijngaarden, Jan Willem Hellenthal, Jean Gerardus Leonardus Jennen, Gerhard Guenter Theodor Kramer, Carl Robert Posthuma, Harmanus van Tellingen, Philip Alfred Whiting, Miroslav Zivkovic
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Patent number: 7843990Abstract: An apparatus includes a transmitter configured to transmit symbols to one or more receivers via a plurality of communication channels of a physical communication link. The transmitter is configured to estimate a phase of one or more off-diagonal elements of a channel matrix for the physical communication link based on values of signal-to-interference-plus-noise ratios at the one or more receivers.Type: GrantFiled: August 31, 2007Date of Patent: November 30, 2010Assignee: Alcatel-Lucent USA Inc.Inventors: Gerhard Guenter Theodor Kramer, Philip Alfred Whiting, Miroslav Zivkovic
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Patent number: 7830978Abstract: A method involves performing a plurality of acts. The acts include transmitting a first signal stream to a first channel of a multi-channel communications medium while transmitting a second signal stream to a different second channel of the medium. The second signal stream is substantially temporally correlated to the first signal stream. The method includes receiving an SINR measured at a receiver configured to receive signals from the first channel. The SINR is measured while the receiver received the first signal stream. The method includes determining a channel matrix element between the first and second channels or a ratio of said channel matrix element to a diagonal element of the channel matrix. The act of determining is based on the received SINR.Type: GrantFiled: August 31, 2007Date of Patent: November 9, 2010Assignees: Alcatel Lucent, Alcatel-Lucent USA Inc.Inventors: Mamoun Guenach, Gerhard Guenter Theodor Kramer, Jerome Louveaux, Jochen Maes, Michael Peeters, Luc Vandendorpe, Jan Sylvia Verlinden, Philip Alfred Whiting, Geert Bert Ysebaert, Miroslav Zivkovic
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Publication number: 20100202281Abstract: An access node of a communication system comprises a plurality of transmitters adapted for communication with at least one receiver. The access node is operative to simultaneously estimate channel coefficients between multiple ones of the transmitters and the receiver, and to utilize the estimated channel coefficients to control at least one data signal sent by at least one of the multiple transmitters to the receiver. In the process of simultaneously estimating the channel coefficients, the access node transmits a plurality of distinct probing signals, each of which is generated based on a distinct combination of a common probing sequence and a selected one of a plurality of different frequency expansions. The access node may comprise at least a portion of at least one central office of a DSL communication system.Type: ApplicationFiled: February 12, 2009Publication date: August 12, 2010Inventors: Gerhard Guenter Theodor Kramer, Carl Jeremy Nuzman
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Publication number: 20100202554Abstract: An access node of a communication system comprises a plurality of transmitters adapted for communication with at least one receiver. The access node is operative to simultaneously estimate channel coefficients between multiple ones of the transmitters and the receiver, and to utilize the estimated channel coefficients to control at least one data signal sent by at least one of the multiple transmitters to the receiver. In the process of simultaneously estimating the channel coefficients, the access node transmits a plurality of distinct probing signals generated based on respective ones of a plurality of different frequency expansions. For example, each of the distinct probing signals may be generated based on a distinct combination of a common probing sequence and a selected one of the plurality of different frequency expansions.Type: ApplicationFiled: May 5, 2009Publication date: August 12, 2010Inventors: Gerhard Guenter Theodor Kramer, Carl Jeremy Nuzman
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Publication number: 20100150577Abstract: An example method includes modulating an optical signal using a Phase Shift Keying (PSK) signal constellation, wherein signal points of the PSK signal constellation are located on at least two rings. The first ring has a first radius r1 and a second ring has a second radius r2, wherein the first radius and second radius differ, and wherein the signal points are not located on a regular n-dimension lattice, where n is an integer. The regular n-dimension lattice is formed from a minimum number of lines parallel to an axis for each of the n-dimensions that connect ones of the signal points of the PSK signal constellation on either side of an origin of the axis. The second radius may be greater than the first radius, with the second radius a non-integer multiple of the first ring radius.Type: ApplicationFiled: December 16, 2009Publication date: June 17, 2010Inventors: Rene'-Jean Essiambre, Gerard J. Foschini, Gerhard Guenter Theodor Kramer, Peter J. Winzer
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Publication number: 20090296865Abstract: A multi-channel processing module is arranged in series with multiple channels of a communication system. The processing module synchronizes downstream symbols among the channels, and synchronizes downstream symbols for at least a given one of the channels with upstream symbols for that channel. The synchronization of downstream symbols among the channels and the synchronization of downstream symbols for at least the given channel with upstream symbols for that channel are collectively achieved by adjusting downstream and upstream adjustable delay elements associated with respective downlink and uplink signal paths in the multi-channel processing module. The channels may comprise respective subscriber lines of a DSL communication system.Type: ApplicationFiled: May 30, 2008Publication date: December 3, 2009Inventors: Alexei E. Ashikhmin, Hungkei Keith Chow, Adriaan J. De Lind Van Wijngaarden, Jan Willem Hellenthal, Jean Gerardus Leonardus Jennen, Gerhard Guenter Theodor Kramer, Carl Robert Posthuma, Harmanus van Tellingen, Philip Alfred Whiting, Miroslav Zivkovic
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Publication number: 20090116582Abstract: Techniques are disclosed that efficiently obtain channel crosstalk estimates in DSL systems and other communication systems that may include unsynchronized channels. For example, a method includes obtaining a first set of estimated measures of crosstalk for a first portion of a plurality of communication channels over which data signals are to be transmitted from a transmitter to a plurality of receivers, and interpolating a second set of estimated measures of crosstalk for a second portion of the plurality of communication channels based on the first set of estimated measures of crosstalk. The first portion of the plurality of communication channels may be a subset of the plurality of communication channels and the second portion of the plurality of communication channels is a remainder of the plurality of communication channels. Each estimated measure of crosstalk may relate to at least one tone associated with at least one of the plurality of communication channels.Type: ApplicationFiled: November 2, 2007Publication date: May 7, 2009Inventors: Alexei Ashikhmin, Adriaan J. De Lind Van Wijngaarden, Gerhard Guenter Theodor Kramer, Philip Alfred Whiting, Miroslav Zivkovic
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Publication number: 20090060067Abstract: A method involves performing a plurality of acts. The acts include transmitting a first signal stream to a first channel of a multi-channel communications medium while transmitting a second signal stream to a different second channel of the medium. The second signal stream is substantially temporally correlated to the first signal stream. The method includes receiving an SINR measured at a receiver configured to receive signals from the first channel. The SINR is measured while the receiver received the first signal stream. The method includes determining a channel matrix element between the first and second channels or a ratio of said channel matrix element to a diagonal element of the channel matrix. The act of determining is based on the received SINR.Type: ApplicationFiled: August 31, 2007Publication date: March 5, 2009Inventors: Mamoun Guenach, Gerhard Guenter Theodor Kramer, Jerome Louveaux, Jochen Maes, Michael Peeters, Luc Vandendorpe, Jan Sylvia Verlinden, Philip Alfred Whiting, Geert Bert Ysebaert, Miroslav Zivkovic
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Publication number: 20090060013Abstract: Techniques are disclosed for compensating for crosstalk using adaptation of data signals transmitted over respective channels of a communication network. In one example, a method comprises the following steps. Data is transmitted to a communication network device via a communication line during a sequence of periods. For each period of the sequence of periods, a separate value of a measure of crosstalk that was measured at the communication network device is received, each value being an average of measurements at the device of measures of crosstalk for a plurality of communication network signal subcarriers. For each individual signal subcarrier of the plurality, a matrix is updated based on the received values, the matrix being configured to precode data transmissions to the communication network device over the individual signal subcarrier. The communication network may be a DSL system, the signal subcarriers may be DSL tones, and the measure of crosstalk may be a SINR value.Type: ApplicationFiled: August 25, 2008Publication date: March 5, 2009Inventors: Alexei E. Ashikhmin, Adriaan J. De Lind Van Wijngaarden, Gerhard Guenter Theodor Kramer, Jochen Maes, Carl Jeremy Nuzman, Carl Robert Posthuma, Danny Van Bruyssel, Jan S. Verlinden, Philip Alfred Whiting, Miroslav Zivkovic
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Publication number: 20090059780Abstract: Techniques are disclosed for compensating for crosstalk using adaptation of data signals transmitted over respective channels of a communication system. For example, a method includes the following steps. A first set of estimated measures of crosstalk is obtained for at least a selected portion of a plurality of communication channels over which data signals are to be transmitted from a transmitter to at least a selected portion of a plurality of receivers. A first set of data signals based on the first set of estimated measures of crosstalk is adapted to generate a first set of adjusted data signals. The first set of adjusted data signals is transmitted to corresponding ones of the plurality of receivers. A second set of estimated measures of crosstalk is obtained for the selected portion of the plurality of communication channels. A second set of data signals for transmission based on the second set of estimated measures of crosstalk is adapted to generate a second set of adjusted data signals.Type: ApplicationFiled: August 31, 2007Publication date: March 5, 2009Inventors: Adriaan J. De Lind Van Wijngaarden, Gerhard Guenter Theodor Kramer, Carl J. Nuzman, Philip Alfred Whiting, Miroslav Zivkovic
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Publication number: 20080247446Abstract: An apparatus includes a transmitter configured to transmit symbols to one or more receivers via a plurality of communication channels of a physical communication link. The transmitter is configured to estimate a phase of one or more off-diagonal elements of a channel matrix for the physical communication link based on values of signal-to-interference-plus-noise ratios at the one or more receivers.Type: ApplicationFiled: August 31, 2007Publication date: October 9, 2008Inventors: Gerhard Guenter Theodor Kramer, Philip Alfred Whiting, Miroslav Zivkovic
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Patent number: 7418051Abstract: A modulation and coding scheme for a communication system is based on use of nonsystematic repeat-accumulate codes for encoding channel information for transmission, and for employing a combined detection and decoding arrangement to decode the coded channel information. The nonsystematic repeat-accumulate codes may be generated by an encoder at a transmitter and decoded by a composite detector/decoder arrangement at a receiver.Type: GrantFiled: November 26, 2003Date of Patent: August 26, 2008Assignee: Lucent Technologies Inc.Inventors: Gerhard Guenter Theodor Kramer, Stephan Ten Brink
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Patent number: 7251769Abstract: Techniques and systems for design and use of generalized LDPC codes. A generalized LDPC code comprises a set of codewords producing valid results when submitted to a validator comprising a set of variable nodes and a set of check nodes, with outputs of the variable nodes being connected to inputs of the check nodes by interleaver edges. Each check node and variable node is in the form of a code, with the output of a node being valid if its inputs form a valid codeword. An extrinsic information transfer function (EXIT) chart is used to form a check node curve and a variable node curve is matched to the check node curve. The variable nodes are then constructed so as to provide the information transfer properties indicated by the variable node curve.Type: GrantFiled: March 17, 2004Date of Patent: July 31, 2007Assignee: Lucent Technologies Inc.Inventors: Alexei Ashikhmin, Gerhard Guenter Theodor Kramer, Stephan Ten Brink