Patents by Inventor Amitkumar Mahadevan
Amitkumar Mahadevan 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: 9270831Abstract: Methods, apparatuses (e.g., DSL system hardware, DSL systems, vectoring control entities), techniques, systems, etc. are used for initializing one or more DSL lines joining a vectored DSL line group operating in Showtime. A super-periodic orthogonal pilot sequence from a set of super-periodic orthogonal pilot sequences is assigned to each joining DSL line, wherein each such super-periodic orthogonal pilot sequence in the set has length L and is orthogonal to other sequences in the set over length T. These super-periodic orthogonal pilot sequences are used on the joining DSL lines to generate at least T sync-symbols worth of initialization data, which is processed to generate initialization data and FEXT mitigation coefficients for use when the joining DSL lines become part of the vectored DSL line group.Type: GrantFiled: April 27, 2012Date of Patent: February 23, 2016Assignee: Ikanos Communications, Inc.Inventors: Amitkumar Mahadevan, Kevin D. Fisher, Nicholas P. Sands
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Patent number: 9184774Abstract: In accordance with one embodiment, a method is implemented in a vectored system for improving a signal-to-noise ratio (SNR) of a far end transmitted signal on a victim line in the system. The method comprises mitigating, by the vectored system, self-induced far-end crosstalk (self-FEXT) on the victim line based on self-FEXT mitigation coefficients and receiving, by a second sensor, information relating to at least one of: self-FEXT of the vectored system, external noise, and the far end transmitted signal. The method further comprises learning, at the second sensor, coefficients relating to self-FEXT coupling into the second sensor and removing self-FEXT from the second sensor based on the learned coefficients. Upon removal of self-FEXT from the second sensor, a linear combiner configured to combine information relating to the victim line and the second line is learned.Type: GrantFiled: November 5, 2013Date of Patent: November 10, 2015Assignee: Ikanos Communications, Inc.Inventors: Laurent Pierrugues, Laurent Francis Alloin, Amitkumar Mahadevan
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Publication number: 20150319276Abstract: The present invention provides a method and apparatus to detect a missing micro-filter. In embodiments, the detection is performed by measuring the distortion caused by an unfiltered telephone device using a SELT (Single Ended Line Test) technique. According to certain aspects, the signal used to perform the distortion measurement is designed such that it causes minimal impact on vectored lines within the same cable. Embodiments of the invention first determines the estimated loop length, then uses the loop length to select a set of signal parameters that will be used to perform the distortion measurement. The parameters to be selected include transmit frequency band and PSD level. According to further aspects, embodiments of the invention include automatically running a missing filter test immediately following a line drop to determine if the line drop was caused by a missing micro-filter.Type: ApplicationFiled: May 4, 2015Publication date: November 5, 2015Inventors: Robert Allen DAY, II, Mehdi ASHARI, Vipin PATHAK, Amitkumar MAHADEVAN
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Patent number: 8885736Abstract: Systems and methods for reducing the peak-to-average ratio (PAR) at the transmitter can reduce the dynamic range required in various analog components. PAR can be reduced by applying a time-domain compensation signal which reduces the magnitude of peaks in the time-domain signal prior to transmission where the time-domain compensation signals use tones that are reserved for the purpose of reducing the PAR. The reservation of these reserved tones for PAR can be implemented by altering the typical startup procedures in a digital subscriber line (xDSL) system. The use of the reserved tones to reduce the PAR can be implemented using a low complexity algorithm or using an adaptive technique.Type: GrantFiled: June 13, 2008Date of Patent: November 11, 2014Assignee: Ikanos Communications, Inc.Inventors: Rahul Garg, Patrick Duvaut, Amitkumar Mahadevan, Harish Jethanandani
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Patent number: 8817907Abstract: The measurement of far-end crosstalk (FEXT) in a Digital Subscriber Line communications is instrumental in the ability of using a multiple input multiple output (MIMO) pre-coder to cancel FEXT. A reliable robust back channel for transmission of error is instrumental to provide error samples for the proper operation of a MIMO pre-coder. Bins can be dedicated to insure bandwidth from the customer premises equipment (CPE) to the central office (CO). By increasing the margin used in the bins, robustness can be added to this back channel between the CPE and CO.Type: GrantFiled: March 26, 2009Date of Patent: August 26, 2014Assignee: Ikanos Communications, Inc.Inventors: Massimo Sorbara, Patrick Duvaut, Amitkumar Mahadevan, Laurent Francis Alloin
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Patent number: 8780686Abstract: The memory storage, transmission and processing demands of a vectored DSL system are reduced by sampling a subset of DSL tones in the DSL tone range used in the vectored system. This data is smoothed (denoised) to further reduce the data's size, sacrificing some fidelity or precision as a result. Finally, lossless entropy coding or the like is performed to encode the FEXT cancellation data for storage and use. The resulting data is less likely to cause transmission bottlenecks in the vectored system, can be stored and used more efficiently for both on-chip and off-chip vectoring implementations, and can be readily updated in various ways.Type: GrantFiled: July 22, 2011Date of Patent: July 15, 2014Inventors: Nicholas P. Sands, Stephanie F. Pereira, Darren B. Hutchinson, Kevin D. Fisher, Amitkumar Mahadevan
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Patent number: 8767812Abstract: Various systems and methods are described for performing fractionally spaced time domain equalization (TEQ). One embodiment is a method implemented in a communication system for training a fractionally spaced time domain equalizer (TEQ). The method comprises performing an initialization phase, averaging a received signal in the system to reduce effects of noise in a channel, determining a channel estimate, and aligning an ideal reference signal with the received signal. The method further comprises updating a target response filter according to a non-integer multiple of a base sampling rate, determining an adaptation error based on useful information both inside and outside a Nyquist band of the TEQ, and updating the TEQ according to the adaptation error.Type: GrantFiled: April 7, 2011Date of Patent: July 1, 2014Assignee: Ikanos Communications, Inc.Inventors: Lin Lin Li, Amitkumar Mahadevan
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Patent number: 8767521Abstract: A system for performing a single ended line test (SELT) of a selected subscriber line within a bundle of in-service subscriber lines each supporting frequency division multiplexed multi-tone modulated XDSL communications. The system comprises: a crosstalk cancellation module and a SELT module. The crosstalk cancellation module is coupled to the subscriber lines and configured to cancel crosstalk between the selected subscriber line under test and the in-service subscriber lines. The SELT module couples to the crosstalk cancellation module and is configured to coordinate SELT testing with the crosstalk cancellation module to cancel crosstalk between the selected subscriber line and the in-service subscriber lines during testing.Type: GrantFiled: September 8, 2010Date of Patent: July 1, 2014Assignee: Ikanos Communications Inc.Inventors: Shailendra K. Singh, Amitkumar Mahadevan, Laurent F. Alloin
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Publication number: 20140056396Abstract: In accordance with one embodiment, a method is implemented in a vectored system for improving a signal-to-noise ratio (SNR) of a far end transmitted signal on a victim line in the system. The method comprises mitigating, by the vectored system, self-induced far-end crosstalk (self-FEXT) on the victim line based on self-FEXT mitigation coefficients and receiving, by a second sensor, information relating to at least one of: self-FEXT of the vectored system, external noise, and the far end transmitted signal. The method further comprises learning, at the second sensor, coefficients relating to self-FEXT coupling into the second sensor and removing self-FEXT from the second sensor based on the learned coefficients. Upon removal of self-FEXT from the second sensor, a linear combiner configured to combine information relating to the victim line and the second line is learned.Type: ApplicationFiled: November 5, 2013Publication date: February 27, 2014Applicant: IKANOS COMMUNICATIONS, INC.Inventors: Laurent PIERRUGUES, Laurent Francis ALLOIN, Amitkumar MAHADEVAN
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Patent number: 8644127Abstract: Systems and methods for partial self-FEXT (far-end crosstalk) are described. One method, among others, comprises determining one or more instantaneous characteristics of an input signal, wherein the one or more instantaneous characteristics comprise one or more of amplitude of the input signal and an energy level of the input signal. The method further comprises selecting one or more disturbers to cancel according to the one or more instantaneous characteristics, wherein selecting one or more disturbers is performed on a per-DMT (discrete multi-tone) symbol basis.Type: GrantFiled: February 26, 2010Date of Patent: February 4, 2014Assignees: Ikanos Communications, Inc., Indian Institute of TechnologyInventors: Pravesh Biyani, Laurent Francis Alloin, Shankar Prakriya, Surendra Prasad, Amitkumar Mahadevan
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Patent number: 8576690Abstract: In accordance with one embodiment, a method is implemented in a vectored system for improving a signal-to-noise ratio (SNR) of a far end transmitted signal on a victim line in the system. The method comprises mitigating, by the vectored system, self-induced far-end crosstalk (self-FEXT) on the victim line based on self-FEXT mitigation coefficients and receiving, by a second sensor, information relating to at least one of: self-FEXT of the vectored system, external noise, and the far end transmitted signal. The method further comprises learning, at the second sensor, coefficients relating to self-FEXT coupling into the second sensor and removing self-FEXT from the second sensor based on the learned coefficients. Upon removal of self-FEXT from the second sensor, a linear combiner configured to combine information relating to the victim line and the second line is learned.Type: GrantFiled: March 18, 2011Date of Patent: November 5, 2013Assignee: Ikanos Communications, Inc.Inventors: Laurent Pierrugues, Laurent Francis Alloin, Amitkumar Mahadevan
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Patent number: 8515016Abstract: Systems and methods for performing bridge tap detection are described. One embodiment is a method which comprises receiving an echo signal for a loop under test where the echo signal is a per-port calibrated echo response obtained using frequency domain reflectometry single-ended line testing (FDR-SELT). The method further comprises analyzing the echo signal to determine whether differentiating features are present in the per-port calibrated echo signal in order to determine whether the loop under test is a bridge tapped loop.Type: GrantFiled: March 7, 2008Date of Patent: August 20, 2013Assignee: Ikanos Communications, Inc.Inventors: Patrick Duvaut, Amitkumar Mahadevan, Vaibhav Dinesh
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Patent number: 8515017Abstract: Systems and methods for performing loop termination are described. One embodiment is a method that comprises receiving a per-port calibrated echo signal of a loop under test, receiving a region designation and a loop length for the loop under test, and determining whether the loop is terminated by a short or open termination based on phase of the per-port calibrated echo signal.Type: GrantFiled: March 7, 2008Date of Patent: August 20, 2013Assignee: Ikanos Communications, Inc.Inventors: Patrick Duvaut, Amitkumar Mahadevan, Vaibhav Dinesh
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Patent number: 8509389Abstract: Systems and methods for performing loop length estimation are described. One embodiment includes a method which comprises receiving an echo signal for a loop under test where the echo signal is a per-port calibrated echo response obtained using frequency domain reflectometry single-ended line testing (FDR-SELT). The method further comprises analyzing characteristics of the echo signal to perform a loop length estimation based on data relating to ripple frequency as a function of loop length.Type: GrantFiled: March 7, 2008Date of Patent: August 13, 2013Assignee: Ikanos Communications, Inc.Inventors: Patrick Duvaut, Amitkumar Mahadevan, Vaibhav Dinesh
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Patent number: 8457219Abstract: Included are embodiments for self protection. At least one embodiment includes Self-protection Unit for protecting a signal that includes a first receiving component configured to receive data, the received data being received as at least one frame and a subframing component configured to subframe at least a portion of the received data, wherein subframing includes converting the at least one into a plurality of subframes. Some embodiments include a subframe interleaver component configured to interleave at least a portion of the subframes.Type: GrantFiled: December 22, 2006Date of Patent: June 4, 2013Assignee: Ikanos Communications, Inc.Inventors: Julien Pons, Amitkumar Mahadevan, Patrick Duvaut
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Patent number: 8396688Abstract: Impulse noise from nearby or intense electrical sources can disrupt communications over digital subscriber lines (DSL). The characterization of the nature, timing and length of impulse noise sources present on a DSL loop is a critical first step in mitigating the effect of impulse noise on DSL communications. DSL standards provide histograms for impulse length and inter-arrival time of impulses. These histograms can be used to derive the nature, maximum frequency and other statistics related to impulse noise on a DSL line.Type: GrantFiled: January 5, 2009Date of Patent: March 12, 2013Assignee: Ikanos Communications, Inc.Inventors: Hemant Kumar Samdani, Kunal Raheja, Rahul Garg, Amitkumar Mahadevan, Patrick Duvaut
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Publication number: 20120275591Abstract: Methods, apparatuses (e.g., DSL system hardware, DSL systems, vectoring control entities), techniques, systems, etc. are used for initializing one or more DSL lines joining a vectored DSL line group operating in Showtime. A super-periodic orthogonal pilot sequence from a set of super-periodic orthogonal pilot sequences is assigned to each joining DSL line, wherein each such super-periodic orthogonal pilot sequence in the set has length L and is orthogonal to other sequences in the set over length T. These super-periodic orthogonal pilot sequences are used on the joining DSL lines to generate at least T sync-symbols worth of initialization data, which is processed to generate initialization data and FEXT mitigation coefficients for use when the joining DSL lines become part of the vectored DSL line group.Type: ApplicationFiled: April 27, 2012Publication date: November 1, 2012Applicant: Ikanos Communications, Inc.Inventors: Amitkumar Mahadevan, Kevin D. Fisher, Nicholas P. Sands
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Patent number: 8300803Abstract: Included are embodiments for reducing alien crosstalk. At least one embodiment of a method includes receiving noise data associated with a first user signal on a first tone, receiving noise data associated with a second user signal on the first tone, and receiving at least one alien crosstalk canceller coefficient for the first user on the first tone. Some embodiments include applying the at least one alien crosstalk canceller coefficient to the second user signal to reduce alien crosstalk for the first user signal.Type: GrantFiled: April 9, 2008Date of Patent: October 30, 2012Assignee: Ikanos Communications, Inc.Inventors: Pravesh Biyani, Amitkumar Mahadevan, Patrick Duvaut
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Patent number: 8300771Abstract: Disclosed are various embodiments for determining a state of loop termination. One embodiment comprises receiving an un-calibrated echo signal for the loop under test using frequency domain reflectometry single-ended line testing (FDR-SELT) and determining the state of loop termination based on phase of the un-calibrated echo signal. The step of determining the state of loop termination comprises determining whether the loop is terminated by an open termination or a short termination by correlating the phase of the echo signal with an expected phase of the echo signal derived from measurements taken at the same loop length for open and short terminations. For other embodiments, the amplitude of the un-calibrated echo signal is analyzed to determine whether the loop is terminated by a matched-impedance termination.Type: GrantFiled: December 1, 2008Date of Patent: October 30, 2012Assignee: Ikanos Communications, Inc.Inventors: Vaibhav Dinesh, Kunal Raheja, Amitkumar Mahadevan, Patrick Duvaut
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Patent number: 8275067Abstract: Systems and methods for reducing the peak-to-average ratio (PAR) at the transmitter can reduce the dynamic range required in various analog components. PAR can be reduced by applying a time-domain compensation signal which reduces the magnitude of peaks in the time-domain signal prior to transmission where the time-domain compensation signals use tones that are reserved for the purpose of reducing the PAR. The reservation of these reserved tones for PAR can be implemented by altering the typical startup procedures in a digital subscriber line (xDSL) system. The use of the reserved tones to reduce the PAR can be implemented using a low complexity algorithm or using an adaptive technique.Type: GrantFiled: June 13, 2008Date of Patent: September 25, 2012Assignee: Ikanos Communications, Inc.Inventors: Rahul Garg, Patrick Duvaut, Harish Jethanandani, Amitkumar Mahadevan