Conexant Systems, Inc.

Conexant, Inc.

Brooktree Broadband Holding, Inc.

Albert Rapaport

Ehud Langberg

Patrick Duvaut

Lujing Cai

William H Scholtz

Shareq Rahman

Faina Shmulyian

Ehud Barak

William Sholtz

Systems and methods for achieving a maximum bit rate in a Discrete MultiTone (DMT) system using a quad spectrum under constraints of avoiding interference with radio frequency interference (RFI) are described. At least one embodiment utilizes bins in notched areas for transmission over short loops without violating the power spectral density (PSD) mask in order to optimize bit allocation.

Method and system for enhancing bit rate in DMT quad spectrum systems

The present invention is directed to implementing theoretical foundations of frequency domain methods aiming to locally decrease the impact of aggregate side lobes of a few discrete frequency tones, in the vicinity of other 'victim' frequencies. The family of frequency methods referred to makes use of one or more 'canceller tones.' The &#x201c;canceller tones&#x201d; loads are optimized to minimize the aggregate power in the neighborhood of the victim frequencies. An exemplary method for decreasing an impact of aggregate side lobes of one or more discrete frequency tones in the vicinity of one or more victim tones comprises the steps of calculating an aggregate power of one or more side lobes of one or more disturber tones within a victim bandwidth; determining at least one optimal load to minimize the aggregate power wherein the at least one optimal load comprises a linear combination of the one or more disturber tones; and applying the at least one optimal load to one or more canceller tones for minimizing the impact of the one or more side lobes of the one or more disturber tones.

Method and system for mitigating Fourier transform side lobes

A system and method for multiple inputs, multiple outputs (MIMO) PSD allocation in a DSL system is disclosed. In some embodiments, the method may comprise monitoring system performance by performing a multi-ended line test (MELT), processing the MELT and allocating PSD based on at least one of system coupling power and system traffic.

MIMO dynamic PSD allocation for DSL networks

An economic low-complexity system and method for echo cancellation are disclosed. The system and method are particularly suited for multi-carrier VDSL using the U0 band. The techniques taught herein may be implemented in VDSL and VDSL2 systems and used to receive signals in three bands (e.g., U0, U1 and U2) simultaneously.

System and method of echo cancellation

A method and system of the present inventions are directed to selecting an optimal mode for ADSL operation based near/far end modem capability, loop length and capacity in the upper bands of modes of operation. A method for switching among a plurality of modes for ADSL modem operation may include the steps of determining a far end modem's capability for supporting one or more of a base mode, a first mode and a second mode; determining a loop length between a near end modem and the far end modem; determining a capacity in an upper band of the first mode and the second mode; and selecting an appropriate mode based on a combination of the far end modem's capability, the loop length and the capacity in the upper band.

Method and system for selecting an optimal asymmetric digital subscriber line mode

A system and method for formatting and transmitting DMT symbols. For each symbol to be transmitted, the last Lsamples of the symbol are prepended to the symbol as a cyclic prefix. Next, of the samples contained within the cyclic prefix, the first &#xce;samples are appended to the symbol as a cyclic suffix. By providing the above described cyclic prefix and suffix, sharp PSD transitions are provided in the first overlapped RFI band (1.8&#x2013;2 MHz) and out of band PSD. Upon formatting, each symbol is transmitted so that its transmission overlaps the prior symbol by &#xce;samples. This results in the output signal being shaped by a raised cosine function for the duration of the &#xce;overlap.

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Morganville, NJ, United States of America

Albert Rapaport