Combined echo and crosstalk cancellation

Details Combined echo and crosstalk cancellation Combined echo and crosstalk cancellation

2011-04-05

2011-04-05

Lee, Andrew (Department: 2472)

Multiplex communications

Crosstalk suppression

C370S252000, C370S269000

Reexamination Certificate

active

07920461

ABSTRACT:
Combined echo and crosstalk cancellation is provided. Frequency domain adaptive filters are used to remove or reduce the effects of echo and crosstalk for a multi-channel and full-duplex communications system. Data from each transmit channel is buffered and converted to the frequency domain. The frequency domain data is multiplied by crosstalk coefficients to obtain a frequency domain correction signal for each channel. Adaptation of the crosstalk coefficients is based on correlations between the error signals and the data from each of the transmit channels. A single frequency domain transform engine, such as a Fast Fourier Transform engine, is employed for all calculations to save power and area.

REFERENCES:
patent: 2005/0105473 (2005-05-01), Hausman et al.
patent: 2005/0152463 (2005-07-01), DeChamps et al.
patent: 2005/0152468 (2005-07-01), Lozhkin
patent: 2005/0281188 (2005-12-01), Cho et al.
patent: 2006/0056551 (2006-03-01), Lozhkin
patent: 2006/0067447 (2006-03-01), Lozhkin et al.
patent: 2006/0146945 (2006-07-01), Chow et al.
patent: 2006/0268675 (2006-11-01), Cho et al.
patent: 2007/0076805 (2007-04-01), Kalluri et al.

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