DSL transmission system with far-end crosstalk cancellation
    2.
    发明公开
    DSL transmission system with far-end crosstalk cancellation 有权
    费尔南本勃起补偿

    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

    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。

    DSL transmission system with far-end crosstalk compensation
    4.
    发明公开
    DSL transmission system with far-end crosstalk compensation 有权
    费尔南本勃起补偿

    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

    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。

    Procédé et dispositif de transmission de données en MC/DCMA
    6.
    发明公开
    Procédé et dispositif de transmission de données en MC/DCMA 审中-公开
    Verfahren und Vorrichtung zurÜbertragungvon MC-CDMA-Daten

    公开(公告)号:EP1265395A1

    公开(公告)日:2002-12-11

    申请号:EP02354092.5

    申请日:2002-06-05

    Inventor: Isson, Olivier

    CPC classification number: H04B1/7087 H04L5/026

    Abstract: L'invention concerne la transmission de données entre des noeuds d'un réseau, par multiplexage multiporteuses à répartition de codes. L'invention consiste à allouer à chaque noeud au moins une matrice d'étalement, un ensemble de données d'au moins une donnée à transmettre par un noeud (N) étant multiplié par la matrice d'étalement qui lui est associée et le produit étant ensuite transmis sur un groupe de porteuses en au moins un ensemble prédéterminé d'échantillons constituant au moins un symbole OFDM (S) ; à former des symboles à transmettre ayant tous la même durée quel que soit le noeud d'émission ; et à adjoindre à chaque symbole transmis un préfixe cyclique (PF) et un suffixe cyclique (SF) représentant un nombre prédéterminé d'échantillons, respectivement de la fin et du début du symbole.

    Abstract translation: 电力线CDMA(码分多路复用)数据系统从具有循环前缀(PF)和后缀(SF)的载波组上的OFDM(正交频分复用)符号的每个节点(Nk)数据乘以所分配的扩展矩阵 )表示从训练阶段中使用的接收数据中减去具有前缀和后缀的预定数目的样本。

    DSL transmission system with means for ensuring local echo orthogonality
    7.
    发明公开
    DSL transmission system with means for ensuring local echo orthogonality 有权
    的装置,其包括用于固定本地回声的正交数字用户线路的传输系统

    公开(公告)号:EP1035700A1

    公开(公告)日:2000-09-13

    申请号:EP99410014.7

    申请日:1999-03-05

    CPC classification number: H04B3/231 H04L27/2647

    Abstract: A digital subscriber line transmission system comprising an IFFT circuit (14) generating successive outgoing time domain symbols (S) on a subscriber line from respective groups of digital frequency domain coefficients; an FFT circuit (18) generating groups of digital frequency domain coefficients from respective incoming time domain symbols (S') received on the subscriber line, a current incoming symbol being delayed with respect to a current outgoing symbol by a predetermined time interval (δ); and means (82) for, during an end portion of a current incoming symbol, subtracting from the signal (IN) received on the subscriber line an estimated echo obtained by a filter (84) from a signal portion (Xn+1) following the end of the current outgoing symbol, and adding thereto, through said filter, a beginning portion (Xn) of the current outgoing symbol, wherein said portions have a duration at least equal to said predetermined time interval.

    Abstract translation: 一种数字用户线传输系统,包括IFFT电路(14)生成关于从数字频域系数的respectivement团的用户线连续传出时域符号(S); 到FFT电路(18)从respectivement呼入时域符号数字频域系数的生成组(S“)上的用户线接收,由一个预定的时间间隔(△)被延迟一个电流输入符号相对于一个当前输出符号 ; 和装置(82),用于在在当前输入的符号的端部,从所述信号(IN)中减去用户线路上接收到估计回声通过从信号部分的滤波器(84)获得(XN + 1)继 当前输出符号的端,和向其中添加,通过所述过滤器,当前输出符号的开始部分(XN),worin所述部分具有一个持续时间,以所述预定时间间隔至少等于。

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