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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Publication number: 20230107882Abstract: Various embodiments of the disclosed PON system enable approximate leveling of the optical-modulation amplitudes in a sequence of optical bursts received by a system's OLT from a plurality of ONUs. Some embodiments additionally enable approximate leveling of the average optical power, received at the OLT from different ONUs, in such a sequence. Some embodiments may rely on control messaging between the OLT and ONUs to perform one or both types of leveling. The disclosed leveling may advantageously provide an effective tool for optimizing upstream transmission for high-speed TDM-PONs.Type: ApplicationFiled: October 6, 2021Publication date: April 6, 2023Applicant: Nokia Solutions and Networks OYInventors: Doutje Van Veen, Vincent Houtsma, Amitkumar Mahadevan, Edward Harstead
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Publication number: 20220248111Abstract: An apparatus, for use by an Optical Network Unit, performs receiving, from an Optical Line Terminal, a broadcast message including code set information indicating a first code set selected from a plurality of error correction code sets; determining whether the first code set is comprised in a group of code sets supported by the Optical Network Unit, wherein, the group of code sets includes at least one code set of the plurality of error correction code sets; and encoding an upstream transmission with the first code set, in case the first code set is included in the group of code sets.Type: ApplicationFiled: December 27, 2021Publication date: August 4, 2022Applicant: Nokia Solutions and Networks OyInventors: Yannick LEFEVRE, Amitkumar MAHADEVAN, Werner VAN HOOF
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Publication number: 20220248110Abstract: An optical network unit (ONU) includes a transmitter and receiver to optically communicate with an optical line terminal (OLT) of a passive optical network. The ONU is configured to send an acknowledgment message to the OLT in response to a burst-profile message unicast by the OLT. The acknowledgement message indicates unsupported forward error correction (FEC) code in response to the burst-profile message identifying an FEC code for upstream transmission and the ONU not supporting the FEC code for upstream transmission to the OLT.Type: ApplicationFiled: February 3, 2021Publication date: August 4, 2022Applicant: Nokia Solutions and Networks OyInventors: Yannick Lefevre, Amitkumar Mahadevan, Werner Van Hoof
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Publication number: 20220123863Abstract: Various example embodiments for supporting forward error correction (FEC) in a communication system are presented. Various example embodiments for supporting FEC in a communication system may include the selection of a FEC setting for a communication channel from a transmitter to a receiver, e.g., the selection of a FEC setting for a communication channel, the selection of a FEC setting for a data burst sent over a communication channel, the selection of a FEC setting for a portion of a data burst sent over a communication channel, switching between FEC settings for different portions of a data burst over a communication channel, or the like, as well as various combinations thereof.Type: ApplicationFiled: September 9, 2021Publication date: April 21, 2022Inventors: Yannick Lefevre, Adriaan de Lind van Wijngaarden, Jochen Maes, Vincent Houtsma, Doutje Van Veen, Amitkumar Mahadevan, Michaël Fivez
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Publication number: 20210289366Abstract: A customer location is identified that can be served by a base-station in a fixed wireless communication system. Embodiments of the invention generate a viewshed for an antenna of the base-station, compute an area of a rooftop at the customer location that is included in the generated viewshed, and identify the customer location as able to be served, or not, by the base-station, based on the area of the rooftop at the customer location that is included in the generated viewshed. Further, a parcel of land on which to install a fixed wireless communication base-station can be identified. Each candidate base-station parcel of land in a list (“candidate base-station locations”) is evaluated and ranked. An evaluated candidate base-station location having a particular ranking is selected as the location on which to install the base-station.Type: ApplicationFiled: June 27, 2019Publication date: September 16, 2021Inventors: Georgios Ginis, Amitkumar Mahadevan, Xia (Sharon) Wan, Kevin D. Fisher
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Publication number: 20210281501Abstract: Various example embodiments for supporting forward error correction (FEC) in a communication system are presented. Various example embodiments for supporting FEC in a communication system may include selection of a FEC setting (e.g., an amount of puncturing and/or shortening of a FEC code, a FEC code, or the like) for a communication channel from a transmitter to a receiver based on channel characteristic information of the communication channel from the transmitter to the receiver (e.g., transfer function information, channel loss information, noise characteristic information, error information (e.g., bit error rate, error modeling, or the like), or the like). Various example embodiments for supporting FEC in a communication system, based on selection of a FEC setting for a communication channel based on channel characteristic information of the communication channel, may be applied within various types of communication systems, including various types of wired and/or wireless communication systems.Type: ApplicationFiled: March 6, 2020Publication date: September 9, 2021Inventors: Amitkumar Mahadevan, Doutje Van Veen, Noriaki Kaneda, Vincent Houtsma, Paul Cautereels, Carl Mertens, Michael Fivez
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Publication number: 20170279489Abstract: Techniques for processing, storing, and using vectoring coefficients in a wireline communication system are disclosed. A wireline device selects victim-disturber specific parameters corresponding to a pair of digital subscriber line (DSL) lines and a subset of tones used to communicate data over the pair of DSL lines and downsamples, based at least in part on a downsampling parameter of the victim-disturber specific parameters, a set of vectoring coefficients. Each set of vectoring coefficients is quantized, and then a set of change values for each set of downsampled and quantized vectoring coefficients is compressed. The set of change values represent a difference between the downsampled and quantized vectoring coefficients across the subset of tones. The wireline device uses the compressed sets of change values to perform vectoring over the DSL lines.Type: ApplicationFiled: March 21, 2017Publication date: September 28, 2017Inventors: Shailendra Kumar Singh, Amitkumar Mahadevan, Laurent Francis Alloin, Avadhani Shridhar
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Patent number: 9565048Abstract: Methods, systems, and devices are described for wired communication. In one aspect, a method includes selecting a gain scalar based at least in part on a constellation point distance associated with a constellation mapper for a line and a tone. The method also includes applying the gain scalar to a tone data output signal of a vector processor.Type: GrantFiled: November 23, 2015Date of Patent: February 7, 2017Assignee: Ikanos Communications, Inc.Inventors: Shailendra Kumar Singh, Amitkumar Mahadevan, Laurent Francis Alloin
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Patent number: 9432493Abstract: 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: GrantFiled: May 4, 2015Date of Patent: August 30, 2016Assignee: Ikanos Communications, Inc.Inventors: Robert Allen Day, II, Mehdi Ashari, Vipin Pathak, Amitkumar Mahadevan
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Publication number: 20160149745Abstract: Methods, systems, and devices are described for wired communication. In one aspect, a method includes selecting a gain scalar based at least in part on a constellation point distance associated with a constellation mapper for a line and a tone. The method also includes applying the gain scalar to a tone data output signal of a vector processor.Type: ApplicationFiled: November 23, 2015Publication date: May 26, 2016Inventors: Shailendra Kumar Singh, Amitkumar Mahadevan, Laurent Francis Alloin
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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: 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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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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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