Texas Instruments Corporation

Michael D Agah

Brian Robert Wiese

Krista S Jacobsen

The present invention provides for a method and apparatus for allocating data to subchannels used for ADSL transmission over a communication link which supports further system transmissions. An expected interference impact from the further system transmissions is estimated for the ADSL subchannels. Signal-to-noise ratios (SNRs) for the subchannels are determined for bit loading by an estimator (). In one embodiment, actual noise associated with the communication link is used at initialization to determine a SNR which is subsequently modified by an adjusting unit () prior to bit loading responsive to the estimated interference impact. In another embodiment, a virtual noise signal, indicative of the estimated interference impact and generated by a noise signal generator (), is summed with the actual noise prior to determining a SNR for bit loading. Prior to transmitting, the data is allocated to the subchannels by a bit loader () based on respective SNRs modified responsive the estimated interference impact.

Method to mitigate effects of ISDN off/on transitions in ADSL

A high performance data communications system (e.g., modem, transceiver, etc.) that has improved control over power dissipation is disclosed. The data communications system allows its power dissipation to be adaptively controlled so as to provide substantially improved control over the power dissipation of the data communications system than has been conventionally possible. The control over power dissipation can be performed only on transmissions, only on receptions, or on both transmissions and receptions. By suitably controlling the power dissipation, the power dissipation of the data communications system can be substantially reduced at lower power settings, while still supporting the higher power settings.

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Monte Sereno, CA, United States of America

Michael D Agah