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

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

2007-02-27

2007-02-27

Tran, Khanh (Department: 2611)

Pulse or digital communications

Transceivers

Modems

Reexamination Certificate

active

10294402

ABSTRACT:
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 (220). 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 (205) 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 (235), 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 (210) based on respective SNRs modified responsive the estimated interference impact.

REFERENCES:
patent: 6061427 (2000-05-01), Ryoo
patent: 6205410 (2001-03-01), Cai
patent: 6510184 (2003-01-01), Okamura
patent: 2003/0076878 (2003-04-01), Jones et al.
patent: 0 918 422 (1999-05-01), None
Gaikwad et al. “Joint Signaling Techniques for Crosstalk-Dominated Communication Channels”, Global Telecommunications Conference, Globecom 1999, p. 1145-1148.

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