DSL rate adaptation

Details DSL rate adaptation DSL rate adaptation

2005-03-15

2009-10-27

Vo, Don N (Department: 2611)

Pulse or digital communications

Transceivers

Transmission interface between two stations or terminals

C375S261000

Reexamination Certificate

active

07609757

ABSTRACT:
A method for enhancing the bit rate and/or margin at which quadrature amplitude modulation (QAM) communication is performed includes the steps of varying a spectral allocation and constellation size with which communication is performed, so as to define a combination of spectral allocation and constellation size at which the bit rate and/or margin are enhanced. The spectral allocation can be varied by varying a stop frequency thereof, while maintaining a substantially constant start frequency, so as to mitigate undesirable high frequency content of the bandwidth. Alternatively, both start and stop frequencies may be varied.

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