Method and apparatus for echo cancellation with discrete multito

Details Method and apparatus for echo cancellation with discrete multito Method and apparatus for echo cancellation with discrete multito

1992-12-01

1994-05-31

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

370 321, 379410, 379411, H03H 730, H03H 740, H03K 5159, H04J 100

Patent

active

053175964

ABSTRACT:
A method of echo cancellation in a full-duplex data communication system with discrete multitone modulation, comprised of an initial step of initializing a set of frequency-domain echo parameters and a set of corresponding time-domain echo parameters, and further including the repeating steps of block multiplying a frequency-domain transmit block of a transmitted signal by the set of frequency-domain echo parameters to produce a frequency-domain echo, converting the frequency-domain transmit block to a time-domain transmit block, subtracting the end of the previous time-domain transmit block from the end of the current time-domain transmit block, performing a convolution of the adjusted time-domain transmit block and the time-domain echo parameters to produce a time-domain echo, subtracting the time-domain echo from a time-domain receive block of a received signal, converting the resulting signal to the frequency-domain to produce a frequency-domain receive block, subtracting the frequency-domain echo from the frequency-domain receive block to produce an echo-free receive block, updating the frequency-domain echo parameters by comparing the echo-free receive block to the frequency-domain transmit block, infrequently updating the time-domain echo parameters by converting the frequency-domain echo parameters to the time-domain, and repeating the repeating steps for each block of the received signal.

REFERENCES:
patent: 5166924 (1992-11-01), Moose

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