Multiplex communications – Duplex – Transmit/receive interaction control
Reexamination Certificate
2006-09-05
2006-09-05
Levitan, Dmitry (Department: 2616)
Multiplex communications
Duplex
Transmit/receive interaction control
Reexamination Certificate
active
07103015
ABSTRACT:
A digital subscriber line transmission system comprising an IFFT circuit generating successive outgoing time domain symbols on a subscriber line from respective groups of digital frequency domain coefficients; an FFT circuit generating groups of digital frequency domain coefficients from respective incoming time domain symbols received on the subscriber line, a current incoming symbol being delayed with respect to a current outgoing symbol by a predetermined time interval; and circuitry for, during an end portion of a current incoming symbol, subtracting from the signal received on the subscriber line an estimated echo obtained by a filter from a signal portion following the end of the current outgoing symbol, and adding thereto, through said filter, a beginning portion of the current outgoing symbol, wherein said portions have a duration at least equal to said predetermined time interval.
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European Search Report from European Application 99410014.7, filed Mar. 5, 1999.
Isson Olivier
Nordstrom Tomas
Levitan Dmitry
Morris James H.
STMicroelectronics S.A.
Telia AB
Wolf Greenfield & Sacks P.C.
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