Patents by Inventor Arthur Robert Calderbank
Arthur Robert Calderbank 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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Publication number: 20230244980Abstract: Technologies for performing error correction in a quantum circuit of a quantum computing system are disclosed. A quantum error correction code (QECC) is selected. The QECC is associated with a codespace. The quantum computing system identifies, based on one or more properties of the QECC, one or more diagonal physical gates in the quantum circuit that induces a target logical gate and preserves the codespace. The quantum computing system configures the quantum computing circuit to implement a quantum error correction protocol using the QECC and at least one of the identified diagonal physical gates.Type: ApplicationFiled: January 27, 2023Publication date: August 3, 2023Inventors: Arthur Robert CALDERBANK, Jingzhen HU, Qingzhong LIANG
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Publication number: 20220261682Abstract: Technologies for addressing coherent noise in a quantum system are disclosed. To passively correct for errors in measurement caused by coherent noise, the quantum system implements an error correction code such that the error correction code effectively reduces the coherent noise to act as an identity operator in a protected subspace of a Hilbert vector space.Type: ApplicationFiled: February 16, 2022Publication date: August 18, 2022Inventors: Arthur Robert CALDERBANK, Jingzhen HU, Qingzhong LIANG
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Patent number: 9780922Abstract: A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas utilize a set of bits of a digital signal to generate a codeword. Delay elements may be provided in antenna output channels, or, with suitable code construction, delay may be omitted. n signals represent n symbols of a codeword are transmitted with n different transmit antennas. At the receiver, the noisy received sequence is decoded. The parallel transmission and channel coding enables an increase the data rate over previous techniques, and recovery even under fading conditions. The channel coding may be concatenated with error correction codes under appropriate conditions.Type: GrantFiled: July 13, 2015Date of Patent: October 3, 2017Assignee: AT&T Intellectual Property II, L.P.Inventors: Arthur Robert Calderbank, Ayman F. Naguib, Nambirajan Seshadri, Vahid Tarokh
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Patent number: 9632866Abstract: Systems and Methods are provided for increasing the number of writes to a page of non-volatile memory before the page must be erased. According to an embodiment, instead of writing a dataword directly to memory, a codeword is written to the memory location. The codeword is selected to minimize overwrite (e.g., bit-flipping) and to maximize the spread of wear across memory cells. In accordance with various embodiments of the invention, coset coding is integrated with error correction encoding; and once the previous state of a page is determined, a coset representative is selected on the basis of maximizing the number of writes to the page before erasing.Type: GrantFiled: September 28, 2012Date of Patent: April 25, 2017Assignee: Duke UniversityInventors: Arthur Robert Calderbank, Adam N. Jacobvitz, Daniel J. Sorin
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Publication number: 20150326352Abstract: A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas utilize a set of bits of a digital signal to generate a codeword. Delay elements may be provided in antenna output channels, or, with suitable code construction, delay may be omitted. n signals represent n symbols of a codeword are transmitted with n different transmit antennas. At the receiver, the noisy received sequence is decoded. The parallel transmission and channel coding enables an increase the data rate over previous techniques, and recovery even under fading conditions. The channel coding may be concatenated with error correction codes under appropriate conditions.Type: ApplicationFiled: July 13, 2015Publication date: November 12, 2015Inventors: Arthur Robert Calderbank, Ayman F. Naguib, Nambirajan Seshadri, Vahid Tarokh
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Publication number: 20150248325Abstract: Systems and Methods are provided for increasing the number of writes to a page of non-volatile memory before the page must be erased. According to an embodiment, instead of writing a dataword directly to memory, a codeword is written to the memory location. The codeword is selected to minimize overwrite (e.g., bit-flipping) and to maximize the spread of wear across memory cells. In accordance with various embodiments of the invention, coset coding is integrated with error correction encoding; and once the previous state of a page is determined, a coset representative is selected on the basis of maximizing the number of writes to the page before erasing.Type: ApplicationFiled: September 28, 2012Publication date: September 3, 2015Inventors: Arthur Robert Calderbank, Adam N. Jacobvitz, Daniel J. Sorin
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Patent number: 9083508Abstract: A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas utilize a set of bits of a digital signal to generate a codeword. Delay elements may be provided in antenna output channels, or, with suitable code construction, delay may be omitted. n signals represent n symbols of a codeword are transmitted with n different transmit antennas. At the receiver, the noisy received sequence is decoded. The parallel transmission and channel coding enables an increase the data rate over previous techniques, and recovery even under fading conditions. The channel coding may be concatenated with error correction codes under appropriate conditions.Type: GrantFiled: March 12, 2014Date of Patent: July 14, 2015Assignee: AT&T Intellectual Property II, L.P.Inventors: Arthur Robert Calderbank, Ayman F. Naguib, Nambirajan Seshadri, Vahid Tarokh
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Publication number: 20140192920Abstract: A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas utilize a set of bits of a digital signal to generate a codeword. Delay elements may be provided in antenna output channels, or, with suitable code construction, delay may be omitted. n signals represent n symbols of a codeword are transmitted with n different transmit antennas. At the receiver, the noisy received sequence is decoded. The parallel transmission and channel coding enables an increase the data rate over previous techniques, and recovery even under fading conditions. The channel coding may be concatenated with error correction codes under appropriate conditions.Type: ApplicationFiled: March 12, 2014Publication date: July 10, 2014Applicant: AT&T INTELLECTUAL PROPERTY II, L.P.Inventors: Arthur Robert Calderbank, Ayman F. Naguib, Nambirajan Seshadri, Vahid Tarokh
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Patent number: 8694876Abstract: A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas utilize a set of bits of a digital signal to generate a codeword. Delay elements may be provided in antenna output channels, or, with suitable code construction, delay may be omitted. n signals represent n symbols of a codeword are transmitted with n different transmit antennas. At the receiver, the noisy received sequence is decoded. The parallel transmission and channel coding enables an increase the data rate over previous techniques, and recovery even under fading conditions. The channel coding may be concatenated with error correction codes under appropriate conditions.Type: GrantFiled: February 25, 2013Date of Patent: April 8, 2014Assignee: AT&T Intellectual Property II, L.P.Inventors: Arthur Robert Calderbank, Ayman F. Naguib, Nambirajan Seshadri, Vahid Tarokh
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Publication number: 20130243126Abstract: A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas is disclosed. A set of bits of a digital signal are used to generate a codeword. Codewords are provided according to a channel code. Delay elements may be provided in antenna output channels, or with suitable code construction delay may be omitted. n signals represent n symbols of a codeword are transmitted with n different transmit antennas. At the receiver MSLE or other decoding is used to decode the noisy received sequence. The parallel transmission and channel coding enables an increase the data rate over previous techniques, and recovery even under fading conditions. The channel coding may be concatenated with error correction codes under appropriate conditions.Type: ApplicationFiled: February 25, 2013Publication date: September 19, 2013Applicant: AT&T Corp.Inventors: Arthur Robert Calderbank, Ayman F. Naguib, Nambirajan Seshadri, Vahid Tarokh
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Patent number: 8422587Abstract: Enhanced performance is achieved by combining channel coding with the space-time coding principles. With K synchronized terminal units transmitting on N antennas to a base station having M?K receive antennas, increased system capacity and improved performance are attained by using a concatenated coding scheme where the inner code is a space-time block code and the outer code is a conventional channel error correcting code. Information symbols are first encoded using a conventional channel code, and the resulting signals are encoded using a space-time block code. At the receiver, the inner space-time block code is used to suppress interference from the other co-channel terminals and soft decisions are made about the transmitted symbols. The channel decoding that follows makes the hard decisions about the transmitted symbols. Increased data rate is achieved by, effectively, splitting the incoming data rate into multiple channels, and each channel is transmitted over its own terminal.Type: GrantFiled: February 2, 2012Date of Patent: April 16, 2013Assignee: AT&T Intellectual Property II, L.P.Inventors: Arthur Robert Calderbank, Ayman Naguib, Nambirajan Seshadri
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Patent number: 8386898Abstract: A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas is disclosed. A set of bits of a digital signal are used to generate a codeword. Codewords are provided according to a channel code. Delay elements may be provided in antenna output channels, or with suitable code construction delay may be omitted. n signals represent n symbols of a codeword are transmitted with n different transmit antennas. At the receiver MLSE or other decoding is used to decode the noisy received sequence. The parallel transmission and channel coding enables an increase the data rate over previous techniques, and recovery even under fading conditions. The channel coding may be concatenated with error correction codes under appropriate conditions.Type: GrantFiled: October 12, 2007Date of Patent: February 26, 2013Assignee: AT&T Intellectual Property II, L.P.Inventors: Arthur Robert Calderbank, Ayman F. Naguib, Nambirajan Seshadri, Vahid Tarokh
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Patent number: 8352845Abstract: A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas is disclosed. A set of bits of a digital signal are used to generate a codeword. Codewords are provided according to a channel code. Delay elements may be provided in antenna output channels, or with suitable code construction delay may be omitted. n signals represent n symbols of a codeword are transmitted with n different transmit antennas. At the receiver MSLE or other decoding is used to decode the noisy received sequence. The parallel transmission and channel coding enables an increase the data rate over previous techniques, and recovery even under fading conditions. The channel coding may be concatenated with error correction codes under appropriate conditions.Type: GrantFiled: December 8, 2011Date of Patent: January 8, 2013Assignee: AT&T Intellectual Property II, L.P.Inventors: Arthur Robert Calderbank, Ayman F. Naguib, Nambirajan Seshadri, Vahid Tarokh
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Publication number: 20120147987Abstract: A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas is disclosed. A set of bits of a digital signal are used to generate a codeword. Codewords are provided according to a channel code. Delay elements may be provided in antenna output channels, or with suitable code construction delay may be omitted. n signals represent n symbols of a codeword are transmitted with n different transmit antennas. At the receiver MSLE or other decoding is used to decode the noisy received sequence. The parallel transmission and channel coding enables an increase the data rate over previous techniques, and recovery even under fading conditions. The channel coding may be concatenated with error correction codes under appropriate conditions.Type: ApplicationFiled: December 8, 2011Publication date: June 14, 2012Inventors: Arthur Robert Calderbank, Ayman F. Naguib, Nambirajan Seshadri, Vahid Tarokh
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Publication number: 20120134436Abstract: Enhanced performance is achieved by combining channel coding with the space-time coding principles. With K synchronized terminal units transmitting on N antennas to a base station having M?K receive antennas, increased system capacity and improved performance are attained by using a concatenated coding scheme where the inner code is a space-time block code and the outer code is a conventional channel error correcting code. Information symbols are first encoded using a conventional channel code, and the resulting signals are encoded using a space-time block code. At the receiver, the inner space-time block code is used to suppress interference from the other co-channel terminals and soft decisions are made about the transmitted symbols. The channel decoding that follows makes the hard decisions about the transmitted symbols. Increased data rate is achieved by, effectively, splitting the incoming data rate into multiple channels, and each channel is transmitted over its own terminal.Type: ApplicationFiled: February 2, 2012Publication date: May 31, 2012Inventors: Arthur Robert Calderbank, Ayman Naguib, Nambirajan Seshadri
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Patent number: 8139695Abstract: Enhanced performance is achieved by combining channel coding with the space-time coding principles. With K synchronized terminal units transmitting on N antennas to a base station having M?K receive antennas, increased system capacity and improved performance are attained by using a concatenated coding scheme where the inner code is a space-time block code and the outer code is a conventional channel error correcting code. Information symbols are first encoded using a conventional channel code, and the resulting signals are encoded using a space-time block code. At the receiver, the inner space-time block code is used to suppress interference from the other co-channel terminals and soft decisions are made about the transmitted symbols. The channel decoding that follows makes the hard decisions about the transmitted symbols. Increased data rate is achieved by, effectively, splitting the incoming data rate into multiple channels, and each channel is transmitted over its own terminal.Type: GrantFiled: November 11, 2009Date of Patent: March 20, 2012Inventors: Arthur Robert Calderbank, Ayman Naguib, Nambirajan Seshadri
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Publication number: 20100056092Abstract: Enhanced performance is achieved by combining channel coding with the space-time coding principles. With K synchronized terminal units transmitting on N antennas to a base station having M?K receive antennas, increased system capacity and improved performance are attained by using a concatenated coding scheme where the inner code is a space-time block code and the outer code is a conventional channel error correcting code. Information symbols are first encoded using a conventional channel code, and the resulting signals are encoded using a space-time block code. At the receiver, the inner space-time block code is used to suppress interference from the other co-channel terminals and soft decisions are made about the transmitted symbols. The channel decoding that follows makes the hard decisions about the transmitted symbols. Increased data rate is achieved by, effectively, splitting the incoming data rate into multiple channels, and each channel is transmitted over its own terminal.Type: ApplicationFiled: November 11, 2009Publication date: March 4, 2010Inventors: Arthur Robert Calderbank, Aynab Baguib, Nambirajan Seshadri
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Patent number: 7643589Abstract: Enhanced performance is achieved by combining channel coding with the space-time coding principles. With K synchronized terminal units transmitting on N antennas to a base station having M?K receive antennas, increased system capacity and improved performance are attained by using a concatenated coding scheme where the inner code is a space-time block code and the outer code is a conventional channel error correcting code. Information symbols are first encoded using a conventional channel code, and the resulting signals are encoded using a space-time block code. At the receiver, the inner space-time block code is used to suppress interference from the other co-channel terminals and soft decisions are made about the transmitted symbols. The channel decoding that follows makes the hard decisions about the transmitted symbols. Increased data rate is achieved by, effectively, splitting the incoming data rate into multiple channels, and each channel is transmitted over its own terminal.Type: GrantFiled: December 9, 2008Date of Patent: January 5, 2010Inventors: Arthur Robert Calderbank, Ayman Naguib, Nambirajan Seshadri
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Patent number: 7623064Abstract: A radar system and method that employs polarization-time diversity in transmitting signals and concurrently processing received reflections from both polarization modes provides information about the scattering matrix of a target without loss of information. Illustratively, the transmitted signals from Golay pairs, and the processing method employs a complex-conjugate time reversal operand. The received reflected signals are processed for a particular distance in mind to develop a scattering matrix of the medium at that distance. By comparing the scattering matrix to known scattering matrices an identification of the target from where the transmitted signals were reflected is obtained.Type: GrantFiled: December 6, 2005Date of Patent: November 24, 2009Inventors: Arthur Robert Calderbank, Stephen David Howard, William Moran
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Publication number: 20090262011Abstract: A radar system and method that employs polarization-time diversity in transmitting signals and concurrently processing received reflections from both polarization modes provides information about the scattering matrix of a target without loss of information. Illustratively, the transmitted signals from Golay pairs, and the processing method employs a complex-conjugate time reversal operand. The received reflected signals are processed for a particular distance in mind to develop a scattering matrix of the medium at that distance. By comparing the scattering matrix to known scattering matrices an identification of the target from where the transmitted signals were reflected is obtained.Type: ApplicationFiled: December 6, 2005Publication date: October 22, 2009Inventors: Arthur Robert Calderbank, Stephen David Howard, William Moran