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    DSL TRANSMISSION SYSTEM FOR COMPENSATING FAR-EDGE CROSSTALK
    1.
    发明专利
    DSL TRANSMISSION SYSTEM FOR COMPENSATING FAR-EDGE CROSSTALK 失效

    公开(公告)号：JP2001237747A

    公开(公告)日：2001-08-31

    申请号：JP2000377457

    申请日：2000-12-12

    Applicant: ST MICROELECTRONICS SA ,  ST MICROELECTRONICS NV

    Inventor： NORDSTROEM TOMAS ,  BENGTSSON DANIEL ,  ISSON OLIVIER

    IPC: H04J11/00 ,  H04B1/62 ,  H04B3/32 ,  H04L25/03 ,  H04L27/26

    Abstract: PROBLEM TO BE SOLVED: To provide a canceller circuit which can eliminate far-edge crosstalks, in a digital subscriber circuit transmission system. SOLUTION: This system includes a pre-compensation means which multiplies a vector S=(Si), where i is equal to 1 to n by a pre-compensation matrix M prior to transmission, so as to obtain a diagonal matrix product H*M. In this example, H is a transmission matrix of plural transmission channels as prescribed by R=H*S and R=(Ri), where i is equal to 1 to n is a vector of discrete multi-tone symbol Ri that is received by a modem. Such a system configuration is attained by a far-edge crosstalk eliminating circuit.

    3.
    发明专利
    未知

    公开(公告)号：DE69915082D1

    公开(公告)日：2004-04-01

    申请号：DE69915082

    申请日：1999-12-14

    Applicant: ST MICROELECTRONICS NV ,  ST MICROELECTRONICS SA

    Inventor： NORDSTROEM THOMAS ,  BENGTSSON DANIEL ,  ISSON OLIVIER

    IPC: H04J11/00 ,  H04B1/62 ,  H04B3/32 ,  H04L25/03 ,  H04L27/26

    Abstract: The invention relates to a far-end crosstalk (FEXT) canceling circuit for a digital subscriber line transmission system, said transmission system comprising a plurality n of line termination (LT) modems (Mi) transmitting discrete multitone (DMT) symbols Si to corresponding network (NT) termination modems (Mc(i)) over n transmission channels. The invention proposes to multiply the vector S = (Si) i = 1 to n, before transmission, by a precompensation matrix M such that the matrix product H*M is diagonal, H being the transfer matrix of the n downstream transmission channels defined by R = H*S where R = (Ri), i = 1 to n, is the vector of the DMT symbols Ri respectively received by the modems Mc(i).

    DSL TRANSMISSION SYSTEM HAVING MEANS INSURING ORTHOGONALITY OF NEAR END ECHO
    8.
    发明专利
    DSL TRANSMISSION SYSTEM HAVING MEANS INSURING ORTHOGONALITY OF NEAR END ECHO 失效

    公开(公告)号：JP2000299650A

    公开(公告)日：2000-10-24

    申请号：JP2000059264

    申请日：2000-03-03

    Applicant: ST MICROELECTRONICS SA ,  TELIA AB

    Inventor： ISSON OLIVIER ,  NORDSTROEM TOMAS

    IPC: H04L5/14 ,  H04B3/21 ,  H04B3/23 ,  H04J11/00 ,  H04L25/03 ,  H04L27/26 ,  H04M1/76 ,  H04M3/00

    Abstract: PROBLEM TO BE SOLVED: To obtain a DSL transmission system of simple constitution by setting a period for processing a filter to an at least previously set time length. SOLUTION: An output symbol system S is subtracted from the output of a delay line 80 by a subtracting circuit 82, and a difference signal is supplied to an FIR filter 84 for realizing a transfer function h* for local echo inference. A filter 84 operates only to sampling data corresponding to a delaying time δor the maximum delaying time of a line and infers echo component from the difference between two continuous symbols. However, being a linear filter, the component is equivalent to the difference between the respective echo components of the two symbols. The output of the filter 84 is supplied for an adding circuit 86, and an input symbol S' receiving the influence of a nonlinear echo is simultaneously received. The circuit 86 supplies a desired orthogonal echo signal to a Fast Fourier Transforming(FFT) circuit 18 as an input signal IN'. Then, the filter 84 operates only in a short period at the starting point of each transmission symbol.

    9.
    发明专利
    未知

    公开(公告)号：DE602004011537D1

    公开(公告)日：2008-03-13

    申请号：DE602004011537

    申请日：2004-09-15

    Applicant: CEA ETABLISSEMENT DE CARACTERE ,  ST MICROELECTRONICS NV

    Inventor： ISSON OLIVIER ,  PIERROT JEAN-BENOIT ,  LENEZ THIERRY DI

    IPC: H04L7/04 ,  H04J3/06 ,  H04L27/26

    Abstract: The method involves determining two vectors from signals received by a receiver. A correlation and a square error between the vectors are calculated. A cost function (F1) that is a linear combination of two previous cost functions is calculated, and according to sign of result, another cost function is calculated to estimate an initial frame, and the receiver is activated. An independent claim is also included for a device to control a receiver in a digital communication system.

    10.
    发明专利
    未知

    公开(公告)号：AT385091T

    公开(公告)日：2008-02-15

    申请号：AT04816122

    申请日：2004-09-15

    Applicant: CEA ETABLISSEMENT DE CARACTERE ,  ST MICROELECTRONICS NV

    Inventor： ISSON OLIVIER ,  PIERROT JEAN-BENOIT ,  LENEZ THIERRY DI

    IPC: H04L7/04 ,  H04J3/06 ,  H04L27/26

    Abstract: The method involves determining two vectors from signals received by a receiver. A correlation and a square error between the vectors are calculated. A cost function (F1) that is a linear combination of two previous cost functions is calculated, and according to sign of result, another cost function is calculated to estimate an initial frame, and the receiver is activated. An independent claim is also included for a device to control a receiver in a digital communication system.

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