Method and apparatus for an X-DSL modem supporting multiple...

Details Method and apparatus for an X-DSL modem supporting multiple... Method and apparatus for an X-DSL modem supporting multiple...

2005-10-25

2005-10-25

Chin, Stephen (Department: 2634)

Pulse or digital communications

Transceivers

Modems

C375S260000, C375S285000, C375S229000, C370S210000, C379S093080

Reexamination Certificate

active

06959036

ABSTRACT:
An X-DSL modem supporting multiple X-DSL line codes including discrete multi-tone (DMT) and carrierless phase and amplitude (CAP). The modem includes: components coupled to one another to form a transmit path and a receive path. The components include an encoder component and a Fourier transform component. The encoder component encodes data associated with a CAP communication channel into QAM symbols and encodes data associated with a DMT communication channel into DMT sub-symbols. The Fourier transform component couples to the encoder component on the transmit path for transforming DMT sub-symbols from a frequency-to-time domain and for transforming QAM symbols from the time-to-frequency domain followed by a filtering in the frequency domain and a subsequent transformation back from the frequency-to-time domain to effect a pulse shaping function without requiring a discrete pulse shaping component in the transmit path.

REFERENCES:
patent: 5999563 (1999-12-01), Polley et al.
patent: 6044107 (2000-03-01), Gatherer et al.
patent: 6055268 (2000-04-01), Timm et al.
patent: 6137839 (2000-10-01), Mannering et al.
patent: 6411657 (2002-06-01), Verbin et al.
patent: 6512739 (2003-01-01), Heidari et al.
patent: 6549512 (2003-04-01), Wu et al.
patent: 2002/0067811 (2002-06-01), Matsumoto

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