Efficient echo cancellation for DMT MDSL

Details Efficient echo cancellation for DMT MDSL Efficient echo cancellation for DMT MDSL

1997-12-23

2000-06-06

Ton, Dang

Multiplex communications

Duplex

Transmit/receive interaction control

370292, 375229, 379283, H04B 320

Patent

active

060727829

ABSTRACT:
An echo cancellation scheme for DMT MDSL digital subscriber loop telecommunications data transfer is disclosed. The echoed data stream frame is aligned with the incoming data stream frame. The time domain equalizer trims the lengths of both the DSL channel and echo channel within the length of the cyclic prefix, so that the time domain convolution for synthesizing the echo is accomplished within the FFT process, enabling the echo to be subtracted in the frequency domain.

REFERENCES:
patent: 5317596 (1994-05-01), Ho et al.
patent: 5479447 (1995-12-01), Chow et al.
patent: 5673290 (1997-09-01), Cioffi
patent: 5754592 (1998-05-01), Flowers et al.
patent: 5781728 (1998-07-01), Rybicki et al.
patent: 5909463 (1999-06-01), Johnson et al.
patent: 5910970 (1999-06-01), Lu

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