公开(公告)号：EP1109329B1

公开(公告)日：2003-04-02

申请号：EP99410174.9

申请日：1999-12-14

Applicant: STMicroelectronics S.A. ,  STMicroelectronics N.V.

Inventor： Nordström, Tomas ,  Bengtsson, Daniel ,  Isson, Olivier

IPC: H04B3/32

CPC classification number: H04B3/32

公开(公告)号：EP1109328A1

公开(公告)日：2001-06-20

申请号：EP99410173.1

申请日：1999-12-14

Applicant: STMicroelectronics S.A. ,  STMicroelectronics N.V.

Inventor： Nordström, Thomas ,  Bengtsson, Daniel ,  Isson, Olivier

IPC: H04B3/32

CPC classification number: H04L25/03343 ,  H04B1/62 ,  H04B3/32 ,  H04L27/2601

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).

Abstract translation: 本发明涉及一种用于数字用户线传输系统的远端串扰（FEXT）消除电路，所述传输系统包括多个n个线路终端（LT）调制解调器（Mi），将离散多音（DMT）符号Si传输到对应的网络 （NT）终端调制解调器（Mc（i））。 本发明提出在传输之前将矢量S =（Si）i = 1乘以预先补偿矩阵M使得矩阵乘积H * M为对角线，H为由n个下行传输信道定义的传输矩阵 R = H * S其中R =（Ri），i = 1至n，分别是由调制解调器Mc（i）分别接收的DMT符号Ri的向量。

公开(公告)号：EP1109328B1

公开(公告)日：2004-02-25

申请号：EP99410173.1

申请日：1999-12-14

Applicant: STMicroelectronics S.A. ,  STMicroelectronics N.V.

Inventor： Nordström, Thomas ,  Bengtsson, Daniel ,  Isson, Olivier

IPC: H04B3/32

CPC classification number: H04L25/03343 ,  H04B1/62 ,  H04B3/32 ,  H04L27/2601

公开(公告)号：EP1109329A1

公开(公告)日：2001-06-20

申请号：EP99410174.9

申请日：1999-12-14

Applicant: STMicroelectronics S.A. ,  STMicroelectronics N.V.

Inventor： Nordström, Tomas ,  Bengtsson, Daniel ,  Isson, Olivier

IPC: H04B3/32

CPC classification number: H04B3/32

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 of line termination modems receiving digital multitone symbols from corresponding network termination modems over a plurality of transmission channels. The invention proposes to estimate the modulated data Si(fj) actually transmitted by the NT modems from the frequency components (Ri) of the DMT symbols received by the LT modems i and to evaluate the FEXT as a linear combination of these estimates. FEXT cancellation for all the LT modems is also proposed in a centralized manner.

Abstract translation: 本发明涉及一种用于数字用户线传输系统的远端串扰（FEXT）消除电路，所述传输系统包括多个线路终端调制解调器，通过多个传输信道从相应的网络终端调制解调器接收数字多频符号。 本发明提出从由LT调制解调器i接收到的DMT符号的频率分量（Ri）估计由NT调制解调器实际发送的调制数据Si（fj），并且将这些估计值作为线性组合来评估FEXT。 所有LT调制解调器的FEXT取消也以集中方式提出。