Ikanos Communications, Inc.

Globespan Virata Corporation

Conexant, Inc.

Brooktree Broadband Holding, Inc.

Oliver Moreno

Patrick Duvaut

Laurent Pierrugues

Ehud Langberg

William H Scholtz

Julien D Pons

Lujing Cai

Massimo Sorbara

Feng Ouyang

William Keasler

A system and method for encoding information is disclosed. In one embodiment, information is encoded using a high protection code for the least significant bit and a low protection code for the next three most significant bits. The remaining bits are uncoded. The high protection code may be a turbo code and the low protection code may be a trellis coded modulation code. In this embodiment, the collection of bits is then mapped according to a diagonally shifted QAM constellation technique.

Hierarchical trellis coded modulation

Various embodiments for addressing the performance objectives of LDSL and examples of smart systems for LDSL are disclosed. An evaluation of the spectral compatibility of two LDSL modes based on two different downstream masks, identified herein as LDSL Wide and Narrow, is disclosed. Spectral compatibility is evaluated in accordance with existing rules. Other embodiments may further comprise determining features of upstream transmission.

Implementation of smart DSL for LDSL systems

A communications system may be characterized by a system error variance because the error variance provides an indication of signal corruption in the system. By strategically adding a secondary sensor to the communications system, system characteristics may be altered so that the system error variance is reduced. A system and method are presented, wherein a secondary sensor is configured to receive a disturbance effect and produce a filtered slave signal as a function of the disturbance effect. The filtered slave signal is configured to alter the characteristics of the communications system and thereby reduce system error variance.

System and method for decreasing cross-talk effects in time-domain-modulation (TDM) digital subscriber line (DSL) systems

Systems and methods for increasing data capacity in communication systems is presented. In one embodiment, line characteristics are determined, and a downstream bandwidth is adaptively allocated in response to the determined line characteristics. In this regard, the upstream and downstream bandwidths may be seen as adaptively changing as a function of line characteristics.

System and method for increasing data capacity in communication systems

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Eatontown, NJ, United States of America

Oliver Moreno