Patents by Inventor Gottfried Ungerboeck
Gottfried Ungerboeck 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: 7936778Abstract: Certain aspects for the start-up procedure of transceivers supporting higher data rates over twisted-pair copper cabling are provided for 10 Gbit/sec Ethernet links (10GBASE-T). During a PMA (physical medium attachment) training period of the start-up procedure, long PMA training frames are exchanged periodically between link partners. A significant portion of each PMA training frame consists of known pseudo random sequences simultaneously transmitted over four wire pairs. PMA training frames include an InfoField for exchanging parameters and control information between link partners. For example, the InfoField's payload comprises fields for indicating current transmit power backoff (PBO), next PBO, requested PBO, transition count, control information, and for communicating precoder coefficients. Information in InfoFields is repeated and is not necessary that a link partner decodes every InfoField.Type: GrantFiled: April 24, 2006Date of Patent: May 3, 2011Assignee: Broadcom CorporationInventors: Gottfried Ungerboeck, Scott Powell
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Patent number: 7933341Abstract: Various systems and methods related to equalization precoding in a communications channel are disclosed. In one implementation preceding is performed on signals transmitted over an optical channel. In one implementation preceding and decoding operations are performed in parallel to facilitate high speed processing in relatively low cost circuits. Initialization of the precoders may be realized by transmitting information related to the characteristics of the channel between transceiver pairs.Type: GrantFiled: February 28, 2001Date of Patent: April 26, 2011Inventors: Oscar E. Agazzi, Gottfried Ungerboeck, Keshab K. Parhi, Christian A. Lutkemeyer, Pieter Vorenkamp, Kevin T. Chan, Myles H. Wakayama
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Publication number: 20100246661Abstract: In a communication system, Huffman coding techniques are used to obtain shaping gains for an improvement in data transmission rates. More particularly, a novel method of Huffman shaping is described that achieves a shaping gain of greater than 1 dB. The shaping gain results in a higher data rate transmission in a communication system where transmitted power is constrained.Type: ApplicationFiled: March 31, 2010Publication date: September 30, 2010Applicant: BROADCOM CORPORATIONInventors: Gottfried Ungerboeck, Arthur J. Carlson
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Publication number: 20100189171Abstract: A method for modulating a sequence of data symbols such that the transmit signal exhibits spectral redundancy. Null symbols are inserted in the sequence of data symbols such that a specified pattern of K data symbols and N?K null symbols is formed in every period of N symbols in the modulated sequence, N and K being positive integers and K being smaller than N.Type: ApplicationFiled: March 31, 2010Publication date: July 29, 2010Applicant: BROADCOM CORPORATIONInventor: Gottfried Ungerboeck
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Publication number: 20100111141Abstract: A communication system performs burst noise cancellation. A transmitter produces and transmits a spread signal that comprises at least one known-value symbol spread by a plurality of non data-carrying orthogonal codes and data symbols spread by at least one data-carrying orthogonal code. The transmitter transmits the spread signal across a communication link that introduces burst noise. A burst noise detector determines burst noise affected chips of the orthogonal codes. A weight computation functional block calculates a plurality of complex-valued combining weights based upon the burst noise affected chips. A vector de-spreader and a linear combiner operate in combination to use the plurality of non data-carrying orthogonal codes, the at least one data-carrying orthogonal code, and the plurality of complex-valued combining weights to de-spread the received spread signal to produce the data symbols with the burst noise substantially removed.Type: ApplicationFiled: January 4, 2010Publication date: May 6, 2010Applicant: BROADCOM CORPORATIONInventors: Bruce J. Currivan, Nabil R. Yousef, Thomas J. Kolze, Gottfried Ungerboeck
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Patent number: 7697615Abstract: A method for modulating a sequence of data symbols such that the transmit signal exhibits spectral redundancy. Null symbols are inserted in the sequence of data symbols such that a specified pattern of K data symbols and N?K null symbols is formed in every period of N symbols in the modulated sequence, N and K being positive integers and K being smaller than N.Type: GrantFiled: November 25, 2008Date of Patent: April 13, 2010Assignee: Broadcom CorporationInventor: Gottfried Ungerboeck
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Patent number: 7697606Abstract: In a communication system, Huffman coding techniques are used to obtain shaping gains for an improvement in data transmission rates. More particularly, a novel method of Huffman shaping is described that achieves a shaping gain of greater than 1 dB. The shaping gain results in a higher data rate transmission in a communication system where transmitted power is constrained.Type: GrantFiled: December 2, 2008Date of Patent: April 13, 2010Assignee: Broadcom CorporationInventors: Gottfried Ungerboeck, Arthur J. Carlson
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Patent number: 7643538Abstract: A communication system performs burst noise cancellation. A transmitter produces and transmits a spread signal that comprises at least one known-value symbol spread by a plurality of non data-carrying orthogonal codes and data symbols spread by at least one data-carrying orthogonal code. The transmitter transmits the spread signal across a communication link that introduces burst noise. A burst noise detector determines burst noise affected chips of the orthogonal codes. A weight computation functional block calculates a plurality of complex-valued combining weights based upon the burst noise affected chips. A vector de-spreader and a linear combiner operate in combination to use the plurality of non data-carrying orthogonal codes, the at least one data-carrying orthogonal code, and the plurality of complex-valued combining weights to de-spread the received spread signal to produce the data symbols with the burst noise substantially removed.Type: GrantFiled: August 12, 2008Date of Patent: January 5, 2010Assignee: Broadcom CorporationInventors: Bruce J. Currivan, Nabil R. Yousef, Thomas J. Kolze, Gottfried Ungerboeck
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Patent number: 7616701Abstract: ZEB (zero excess bandwidth) modulation. The modulation rate of a signal is increased to the entirety of a communication channel's available bandwidth. Spectral zeroes at the edges of the available bandwidth now coincide with spectral zeroes at the edges of the Nyquist band and lead to ISI (intersymbol interference), which cannot be eliminated by equalization. Thus, in a ZEB system intersymbol interference (ISI) is intentionally allowed and dealt with by the known technique of TH (Tomlinson-Harashima) precoding. Comparison of conventional zero-ISI systems with ZEB systems, both exhibiting identical transmit spectra with finite spectral roll offs towards the edges of the available bandwidth, illustrate significant gains in channel throughput achievable by the ZEB systems. Similar gains can hardly be achieved by more sophisticated channel coding for zero-ISI systems. For ZEB systems an effective spectral shaping involving a simple infinite impulse response (IIR) of the overall channel is proposed.Type: GrantFiled: February 17, 2004Date of Patent: November 10, 2009Assignee: Broadcom CorporationInventor: Gottfried Ungerboeck
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Publication number: 20090215403Abstract: Signal processing under attenuated transmission conditions. Within an orthogonal signal space, the number of orthogonal signals that are used to transmit information from a transmitter to a receiver is reduced and the transmitted power of each of the now remaining orthogonal signals is modified; this may involve increasing the power of all of the remaining orthogonal signals equally or alternatively modifying them individually. The same modulation used before the reduction may also be used afterwards; within communication systems having multiple transmitter-receiver paths, this will ensure that the communication system's throughput and efficiency will remain unchanged even when one (or more) transmitter-receiver paths are highly attenuated. In addition, robust mode operation is provided for ranging and registering of transmitter devices when entering the communication system.Type: ApplicationFiled: May 3, 2009Publication date: August 27, 2009Applicant: BROADCOM CORPORATIONInventors: Bruce J. Currivan, Thomas J. Kolze, Daniel H. Howard, Gottfried Ungerboeck
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Publication number: 20090141791Abstract: In a communication system, Huffman coding techniques are used to obtain shaping gains for an improvement in data transmission rates. More particularly, a novel method of Huffman shaping is described that achieves a shaping gain of greater than 1 dB. The shaping gain results in a higher data rate transmission in a communication system where transmitted power is constrained.Type: ApplicationFiled: December 2, 2008Publication date: June 4, 2009Applicant: BROADCOM CORPORATIONInventors: Gottfried Ungerboeck, Arthur J. Carlson
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Publication number: 20090129484Abstract: A method and apparatus is disclosed to map a sequence of data to Quadrature Amplitude Modulation (QAM) constellation symbols. The method and apparatus encodes only a portion of the sequence of data and leaves a remaining portion of the sequence of data unencoded. The encoded portion of the sequence of data and the remaining unencoded portion of the sequence of data are then mapped into modulation symbols of the QAM constellation. The encoded portion of the sequence of data selects subsets of the QAM constellation, and the remaining unencoded portion of the sequence of data determines a specific modulation symbol within each subset of the QAM constellation.Type: ApplicationFiled: November 17, 2008Publication date: May 21, 2009Applicant: Broadcom CorporationInventors: Lin HE, Thomas J. Kolze, Ba-Zhong Shen, Gottfried Ungerboeck, Bruce J. Currivan
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Patent number: 7529289Abstract: Signal processing under attenuated transmission conditions. Within an orthogonal signal space, the number of orthogonal signals that are used to transmit information from a transmitter to a receiver is reduced and the transmitted power of each of the now remaining orthogonal signals is modified; this may involve increasing the power of all of the remaining orthogonal signals equally or alternatively modifying them individually. The same modulation used before the reduction may also be used afterwards; within communication systems having multiple transmitter-receiver paths, this will ensure that the communication system's throughput and efficiency will remain unchanged even when one (or more) transmitter-receiver paths are highly attenuated. In addition, robust mode operation is provided for ranging and registering of transmitter devices when entering the communication system.Type: GrantFiled: May 1, 2003Date of Patent: May 5, 2009Assignee: Broadcom CorporationInventors: Bruce J. Currivan, Thomas J. Kolze, Daniel H. Howard, Gottfried Ungerboeck
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Patent number: 7515642Abstract: LDPC (Low Density Parity Check) coded 128 DSQ (Double Square QAM) constellation modulation and its associated labeling. A novel means is introduced by which a constellation may be arranged and mapping in its symbols may be determined to provide for improved performance. One application area in which this may be employed is transmission over twisted pair (typically copper) cabling existent within data centers of various networks. The operation of the IEEE 802.3 Ethernet local area networks currently being used (as well as those currently under development) would benefit greatly by employing the various principles presented herein. When this novel approach of an LDPC coded 128 DSQ constellation modulation combined with TH (Tomlinson-Harashima) preceding is employed within a communication device at a transmitter end of a communication channel (i.e., in a transmitter and/or a transceiver), the overall operation of a communication system may improve significantly when compared to prior techniques.Type: GrantFiled: August 25, 2005Date of Patent: April 7, 2009Assignee: Broadcom CorporationInventors: Gottfried Ungerboeck, Ba-Zhong Shen, Scott Richard Powell, Kelly Brian Cameron, Hau Thien Tran
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Publication number: 20090074104Abstract: A method for modulating a sequence of data symbols such that the transmit signal exhibits spectral redundancy. Null symbols are inserted in the sequence of data symbols such that a specified pattern of K data symbols and N?K null symbols is formed in every period of N symbols in the modulated sequence, N and K being positive integers and K being smaller than N.Type: ApplicationFiled: November 25, 2008Publication date: March 19, 2009Applicant: BROADCOM CORPORATIONInventor: Gottfried Ungerboeck
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Publication number: 20080298437Abstract: A communication system performs burst noise cancellation. A transmitter produces and transmits a spread signal that comprises at least one known-value symbol spread by a plurality of non data-carrying orthogonal codes and data symbols spread by at least one data-carrying orthogonal code. The transmitter transmits the spread signal across a communication link that introduces burst noise. A burst noise detector determines burst noise affected chips of the orthogonal codes. A weight computation functional block calculates a plurality of complex-valued combining weights based upon the burst noise affected chips. A vector de-spreader and a linear combiner operate in combination to use the plurality of non data-carrying orthogonal codes, the at least one data-carrying orthogonal code, and the plurality of complex-valued combining weights to de-spread the received spread signal to produce the data symbols with the burst noise substantially removed.Type: ApplicationFiled: August 12, 2008Publication date: December 4, 2008Applicant: BROADCOM CORPORATIONInventors: BRUCE J. CURRIVAN, NABIL R. YOUSEF, THOMAS J. KOLZE, GOTTFRIED UNGERBOECK
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Patent number: 7460595Abstract: In a communication system, Huffman coding techniques are used to obtain shaping gains for an improvement in data transmission rates. More particularly, a novel method of Huffman shaping is described that achieves a shaping gain of greater than 1 dB. The shaping gain results in a higher data rate transmission in a communication system where transmitted power is constrained.Type: GrantFiled: July 25, 2005Date of Patent: December 2, 2008Assignee: Broadcom CorporationInventors: Gottfried Ungerboeck, Arthur J. Carlson
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Publication number: 20080291980Abstract: Cancellation of interference in a communication system with application to S-CDMA. A relatively straight-forward implemented and computationally efficient approach of selecting a predetermined number of unused codes is used to perform weighted linear combination selectively with each of the input spread signals in a multiple access communication system. If desired, the predetermined number of unused codes is always the same in each implementation. Alternatively, the predetermined number of unused codes is selected from within a reordered code matrix using knowledge that is shared between the two ends of a communication system, such as between the CMs and a CMTS. While the context of an S-CDMA communication system having CMs and a CMTS is used, the solution is generally applicable to any communication system that seeks to cancel narrowband interference. Several embodiments are also described that show the generic applicability of the solution across a wide variety of systems.Type: ApplicationFiled: September 18, 2006Publication date: November 27, 2008Applicant: Broadcom Corporation, a California CorporationInventors: Bruce J. Currivan, Thomas J. Kolze, Gottfried Ungerboeck, Nabil R. Yousef
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Patent number: 7457364Abstract: A method for modulating a sequence of data symbols such that the transmit signal exhibits spectral redundancy. Null symbols are inserted in the sequence of data symbols such that a specified pattern of K data symbols and N?K null symbols is formed in every period of N symbols in the modulated sequence, N and K being positive integers and K being smaller than N.Type: GrantFiled: August 2, 2004Date of Patent: November 25, 2008Assignee: Broadcom CorporationInventor: Gottfried Ungerboeck
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Patent number: 7457352Abstract: Cancellation of interference in a communication system with application to S-CDMA. A relatively straight-forward implemented and computationally efficient approach of selecting a predetermined number of unused codes is used to perform weighted linear combination selectively with each of the input spread signals in a multiple access communication system. If desired, the predetermined number of unused codes is always the same in each implementation. Alternatively, the predetermined number of unused codes is selected from within a reordered code matrix using knowledge that is shared between the two ends of a communication system, such as between the CMs and a CMTS. While the context of an S-CDMA communication system having CMs and a CMTS is used, the solution is generally applicable to any communication system that seeks to cancel narrowband interference. Several embodiments are also described that show the generic applicability of the solution across a wide variety of systems.Type: GrantFiled: September 18, 2006Date of Patent: November 25, 2008Assignee: Broadcom CorporationInventors: Bruce J. Currivan, Thomas J. Kolze, Gottfried Ungerboeck, Nabil R. Yousef