Amitkumar Mahadevan

7835368, Nov 16, 2010

May 20, 2008

12/123925

Patrick Duvaut - Tinton Falls NJ, US
Amitkumar Mahadevan - Eatontown NJ, US
Pravesh Biyani - Raipur, IN
Shailendra Singh - Unnao, IN
Satyavardhan Maheshwari - Noida, IN

Ikanos Communications, Inc. - Fremont CA

H04L 12/28

370397

A method is described for reducing self-induced far end crosstalk (self-FEXT) in a multiple input multiple output (MIMO) digital subscriber line (xDSL) system. An initial value for an off-diagonal multiple input multiple output canceller (ODMC) is derived while the ODMC is inactive and while in data mode. The method includes activating the initial ODMC and converging towards an steady-state value for the ODMC by performing an adaptive algorithm to maximize the Shannon's capacity of the system and to reduce upstream self-FEXT. Bit loading is performed and a frequency domain equalizer (FEQ) is updated.

7953143, May 31, 2011

Feb 22, 2008

12/036035

Amitkumar Mahadevan - Eatontown NJ, US
Patrick Duvaut - Tinton Falls NJ, US
Julien D. Pons - Carteret NJ, US

Ikanos Communications, Inc. - Fremont CA

H04B 1/38
H04K 1/10

375222, 375260

A system is described that comprises a frequency domain impulse noise detector configured to monitor received discrete multi-tone (DMT) symbols for impulse noise, a Reed Solomon (RS) decoder with erasure and erasure correction capability for performing error correction on received DMT symbols, and an optimization module configured to adjust parameters associated with the impulse noise detector, the optimization module configured to adjust values for β, β, and a ratio (m/M), wherein M is a number of monitored tones, m is a number of slicer error samples that must exceed a decision threshold for a symbol to be flagged as corrupted, and βand βare values associated with a monotonic function of a ratio of a statistical parameter of disruptive noise to a statistical parameter of nominal noise.

7974181, Jul 5, 2011

Jun 13, 2008

12/138731

Amitkumar Mahadevan - Eatontown NJ, US
Patrick Duvaut - Tinton Falls NJ, US
Harish Jethanandani - Jaipur, IN
Rahul Garg - Faridabad, IN

Ikanos Communications, Inc. - Fremont CA

H04J 11/00

370210, 370203, 375260, 375295

Systems and methods for reducing the peak-to-average power 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 in the oversampled regime, using tones reserved for PAR reduction. A set of vectors corresponding to PAR tones is generated by processing out-of-phase symbols for each PAR tone to form a span matrix. The span matrix is used to find a best fit of a desired target signal to a time-domain compensation signal comprising only PAR tones.

7978756, Jul 12, 2011

Apr 7, 2008

12/098696

Hemant Samdani - New Delhi, IN
Kunal Raheja - Noida, IN
Rahul Garg - Faridabad Haryana, IN
Patrick Duvaut - Tinton Falls NJ, US
Amitkumar Mahadevan - Eatontown NJ, US
Robert A. Day - Manalapan NJ, US
Robin Levonas - Holmdel NJ, US

Ikanos Communications, Inc. - Fremont CA

H04B 3/46
H04B 17/00
H04Q 1/20

375227, 375284, 375285, 375346, 375228, 375257, 379416, 702 69

Systems and methods for monitoring impulse noise are described. At least one embodiment is a method, which comprises detecting whether impulse noise is present and in response to detecting the presence of impulse noise, performing time domain analysis to determine whether one or more impulse noise sources are present based on minimum interarrival time and maximum impulse length. The method further includes performing frequency domain analysis to estimate frequencies associated with the one or more impulse noise sources and based on the time domain analysis and frequency domain analysis, providing a total number of impulse noise sources and frequencies associated with the impulse noise sources. In this regard, the embodiments described herein provide dual-speed monitoring of impulse noise in the form of short-term and long-term monitoring. The use of dual-speed monitoring ensures that dynamic changes in the impulse noise environment are quickly addressed and also ensures better characterization of multiple impulse noise sources in order to provide better impulse noise protection.

8032800, Oct 4, 2011

Dec 28, 2006

11/617028

Julien Pons - Eatontown NJ, US
Amitkumar Mahadevan - Eatontown NJ, US
Patrick Duvaut - Tinton Falls NJ, US

Ikanos Communications, Inc. - Fremont CA

G06F 11/00

714701, 370464, 370473, 711157

Included are embodiments for subframe interleaving. At least one embodiment of a method includes receiving at least one subframe, the at least one subframe being derived from a plurality of frames of data and interspersing at least a portion of the at least one subframe according to a predetermined subframe interleaving strategy.

8144757, Mar 27, 2012

Jul 23, 2008

12/178355

Joel M. Morris - Columbia MD, US
Ronald Hozloehner - Munich, DE
Amitkumar Mahadevan - Baltimore MD, US
Curtis R. Menyuk - Silver Spring MD, US
John W. Zweck - Columbia MD, US

University of Maryland, Baltimore County - Baltimore MD

H04B 3/46

375227

A dual adaptive importance-sampling system and method is provided that can estimate the probability of events by combining dual complementary importance-sampling simulations. The present invention exploits the ability to determine an optimal biased pdf using an iterative procedure that requires relatively little a priori knowledge of how to bias. Hence, the present invention is particularly suited for evaluating the BERs and/or WERs of coded communication and storage systems, and is generally applicable to arbitrarily chosen codes. When applied to coded communication and storage systems, the present invention provides a versatile technique for the fast and accurate estimation of BERs and WERs of FEC codes down to values of 10or lower.

8194767, Jun 5, 2012

Apr 21, 2011

13/091651

Patrick Duvaut - Tinton Falls NJ, US
Amitkumar Mahadevan - Eatontown NJ, US
Massimo Sorbara - Freehold NJ, US
Ehud Langberg - Wayside NJ, US

Ikanos Communications, Inc. - Fremont CA

H04L 27/28

375260

One embodiment is a method for precoding data for transmission in a discrete multi-tone (DMT) system to cancel self-induced far end crosstalk (self-FEXT). The method comprises learning, by the system, characteristics associated with a plurality of N users within a digital subscriber line (xDSL) system to determine an initial off-diagonal multiple input multiple output (MIMO) precoder (ODMP) for a given tone frequency and converging towards an ODMP from the initial ODMP to cancel self-FEXT for the plurality of N users, wherein the ODMP is represented as a zero diagonal matrix containing only off-diagonal terms.

8204211, Jun 19, 2012

Apr 29, 2009

12/431878

Amitkumar Mahadevan - Eatontown NJ, US
Patrick Duvaut - Paris, FR
Laurent Francis Alloin - Monmouth Beach NJ, US

Ikanos Communications, Inc. - Fremont CA

H04M 1/00
H04M 9/00
H04M 1/76

379417

Systems and methods are described for selecting tones for far-end crosstalk (FEXT) mitigation. In particular, systems and methods are described for performing far-end crosstalk (FEXT) mitigation within a digital subscriber line (xDSL) system. One embodiment is a method that comprises determining a first set of function values relating to a per-tone signal-to-noise ratio (SNR) for a user among a plurality of users for a number of tones, wherein the number of tones is less than or equal to a total number of tones available for transmission. The method further comprises estimating coefficients for performing FEXT mitigation for the number of tones, performing FEXT mitigation on the number of tones based on the estimated coefficients, and performing FEXT mitigation on a selected group of tones from among the number of tones, wherein the selected group of tones is less than or equal to the number tones.