Ikanos Communications, Inc.

Globespan Virata Corporation

Brooktree Broadband Holding, Inc.

Qualcomm Incorporated

Indian Institute of Technology Delhi

Indian Institute of Technology

Globespan, Inc.

Laurent Alloin

Laurent Pierrugues

Amitkumar Mahadevan

Arnold Muralt

Massimo Sorbara

Patrick Duvaut

Daniel Amrany

Julien D Pons

Pravesh Biyani

William Edward Keasler, Jr

Vinay Kumar Chapala

Jean-Francois Lopez

Ming Gu

Shailendra Singh

Shankar Prakriya

James T Schley May

Surendra Prasad

Kevin Dean Fisher

Hassan Kaywan Afkhami

Avadhani Shridhar

Yair Aizenberg

Ravindra M Lambi

Murli Mohan Rao

Peter Kleewein

Wolfgang Kleewein, Legal Representative

S M Zafaruddin

Chapala Vinay Kumar

Vinod Venkatesan

Yong Je Lim

This disclosure provides systems, methods, and apparatus for wireline communication. A digital subscriber line (DSL) receiver may detect one or more power line communication (PLC) sound packets and measure PLC signal leakage on a set of DSL lines based on the detected sound packets. For example, PLC sound packets may be transmitted by PLC devices within a PLC network, and impulse noise received on the set of DSL lines corresponding to the transmitted PLC sound packet may be detected by a DSL receiver (such as a consumer premises equipment (CPE)). The DSL receiver may measure PLC signal leakage on the set of DSL lines based on the detected PLC sound packets. In some cases, the PLC sound packets may be detected based on a duration, a position, or an arrival time of a PLC sound packet.

Power line communication interference probing and measurement on digital subscriber lines

This disclosure provides systems, methods, and apparatus for wireline communication. Independent control of probing signals transmitted on different power line couplings may be used to characterize power line communication (PLC) signal leakage on a set of digital subscriber line (DSL) lines. For example, PLC packets may be sent on a primary coupling and an alternate coupling, and PLC signal leakage from these couplings may be measured by a device, such as a PLC device or a DSL device, connected to the set of DSL lines. The measurements from each coupling may enable a determination as to which of the couplings (either primary or alternate) is more imbalanced and results in relatively more PLC signal leakage into the set of DSL lines. Accordingly, a transmission power and a precoder may be determined based on the measured PLC signal leakage to mitigate interference on the twisted pair.

Digital subscriber line interference measurements and power line communication beamforming optimization

The present invention relates to methods and apparatuses for sensing noise sources in a wireline communications environment such as a customer premises environment in a DSL system. In embodiments, the invention includes an additional sensor that is connected to power mains in a DSL customer premises environment either to characterize, at their source, noises coupling into the DSL lines, and/or to mitigate their impact into the DSL lines. One objective is associated with diagnostics that help to better characterize the noise signals themselves and derive correlation of signals sensed from the power mains and their possible projection onto the DSL line. Another objective makes use of these power line sensor signals to mitigate or to eliminate power line noises that make their way onto the DSL line. Example embodiments further include and exploit signals from additional secondary sensors such as secondary common mode, differential mode and phantom mode sensors.

Method and apparatus for sensing noise signals in a wireline communications environment

The present invention relates generally to addressing performance issues in xDSL communication systems, and more particularly to methods and apparatuses to measure and characterize CM noise impacting a DSL line in a customer premises, measurements and characterization of the projection of these CM signals in Differential Mode (DM), and finally a derivation of an estimate of the loop balance.

Methods and apparatuses for characterizing common mode noise and estimating loop imbalance

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.

Reduced precision vector processing

In general, the present invention provides an efficient usage of Far End Crosstalk (FEXT) coefficient memory in a G.fast vectoring system. According to certain aspects, embodiments of the invention provide a simple scheme for efficient management of the Discontinuous (DO) and Regular Operation (RO) FEXT coefficient memories to handle the complexity of lines joining/leaving the system in both regular and DO groups. In embodiments, by disabling the power-efficient, Discontinuous Operation, a G.fast system according to the invention first frees up the DO coefficient memory. Next, the system uses this memory as the staging area to manage joining/leaving events. Finally the system re-enables to the power-efficient Discontinuous Operation and re-populates the DO coefficient memory.

Method and apparatus for managing joining events for G.fast vectoring with discontinuous operation

The present invention generally relates to a method and apparatus for effectively detecting and characterizing noise and other events affecting a communications system such as digital subscriber lines (DSL). According to certain aspects, the invention includes a noise analysis engine that is embedded in customer premises equipment that classifies noise sources according to their specific characteristics and tracks each noise source in a dynamic manner, in such a way as to provide visibility to the changing noise environment within the customer premises and/or report this environment to a remote entity.

Method and apparatus for detecting and analyzing noise and other events affecting a communication system

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.

Systems and methods for implementing a multi-sensor receiver in a DSM3 environment

In general, the present invention provides methods and apparatuses for exploiting the extra degree of freedom provided by the sensing of the CM signal along with the DM signal at the receiver end of a wireline communication system. According to certain aspects, this extra degree of freedom can be used to cancel alien noises at the receiver in both upstream downstream directions. According to further aspects, a CM channel can be potentially used to exploit the diversity created in the CM channel along with the regular DM channel. This acts as the motivation for employing a diversity receiver scheme at the receiver, especially in downstream communications received at a Customer Premises.

DM-CM diversity receiver for a wireline communication system

A method implemented in a multi-user communication system is described for performing far-end crosstalk (FEXT) cancellation for each victim user. The method comprises performing dynamic programming to allocate resources according to (N&#x2212;1) normalized disturber coupling values and difference rate function values associated with N total users in the system involved in partial FEXT cancellation. In accordance with some embodiments, dynamic programming comprises selecting a tone and one or more disturbers to be cancelled for the tone.

Systems and methods of resource allocation for cancellation of crosstalk

Derivations of new PHY layer diagnostics primitives are based on the normalized error samples collected through G.993.5. The processing uses the ERB and L2 Ethernet packet encapsulation of these ERB data in order to abstract the processing from the PHY layer device dependency, as well as to allow a local and remote processing of the primitives for diagnostics purposes.

Diagnostics primitives on L2/ERB normalized error samples

A system, method, and a computer readable medium having instructions thereupon for synchronized multi-user multi-carrier communications are provided. For example, a synchronized multi-user multi-carrier communication system includes a transmitter, a receiver communicatively coupled to the transmitter via a plurality of communication channels associated with multiple users, and a computing device, coupled to at least one of the transmitter and the receiver, comprising a memory device in communication with one or more processors. The one or more processors are configured to obtain noise samples for the plurality of communication channels, determine a coupling between carriers on the plurality of communication channels, determine a noise model for a carrier based upon the noise samples and the determined coupling, and store the noise model in the memory device.

System and method for improving spectral efficiency and profiling of crosstalk noise in synchronized multi user multi-carrier communications

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Monmouth Beach, NJ, United States of America

Laurent Alloin