公开(公告)号：US3716807A

公开(公告)日：1973-02-13

申请号：US3716807D

申请日：1971-05-24

Applicant: IBM

Inventor： SHA R ,  TANG D

IPC: H04L25/03 ,  H04B3/04

CPC classification number: H04L25/03133

Abstract: A recursive automatic equalizer with extremely fast convergence is disclosed. The equalizer includes a plurality of equalizer stages connected in cascade which first reduces impulse response of the communication channel to substantially zero. The front portion or sidelobe is reduced to substantially zero distortion by adjusting the tap settings of successive equalizer stages after successive iterations (the first iteration adjusts the tap settings of the first equalizer stage, the second iteration adjusts the tap settings of the second equalizer stage, and so on) such that after n iterations a given initial distortion D is reduced to substantially zero. The tap setting algorithm involved and the method of operating the cascaded equalizer is disclosed. Finally, after n iterations, the output signal which can be described by the function 1-A(n) is modified by the reciprocal of the foregoing function and, is this manner, the rear or trailing portion of an input signal which is to be equalized has its rear sidelobe distortion reduced to substantially zero leaving only the desired main pulse. Apparatus for modifying the trailing or rear end of a pulse to be equalized is also disclosed.

Abstract translation: 公开了具有极快收敛的递归自动均衡器。 均衡器包括级联的多个均衡器级，其首先将通信信道的脉冲响应减小到基本为零。 通过在连续迭代之后调整连续均衡器级的抽头设置（第一次迭代调整第一均衡器级的抽头设置，第二次迭代调整第二均衡器级的抽头设置），前部或副瓣被减小到基本上零失真， 等等），使得在n次迭代之后，给定的初始失真D被减小到基本为零。 公开了涉及的抽头设置算法和操作级联均衡器的方法。 最后，在n次迭代之后，可以由函数1-A（n）描述的输出信号由上述函数的倒数修改，并且这样，将要输入的信号的后部或尾部 其均衡的后旁瓣失真减小到基本为零，仅留下期望的主脉冲。 还公开了用于修改待均衡的脉冲的尾端或后端的装置。

公开(公告)号：US3708766A

公开(公告)日：1973-01-02

申请号：US3708766D

申请日：1970-12-31

Applicant: IBM

Inventor： SHA R ,  TANG D

IPC: H04L25/03 ,  H04B3/04

CPC classification number: H04L25/03133

Abstract: An automatic equalizer with extremely fast convergence is disclosed. The weight setting procedure or algorithm is basically an iterative operation which can be conveniently expressed by cascaded equalizers. One form of the apparatus utilized consists of a plurality of equalizer stages which have their tap settings changed after successive iterations (the first iteration adjusts the first equalizer stage, the second iteration adjusts the second equalizer stage and so on) such that after n iterations a given initial distortion D is reduced to at most D2 . The algorithm involved and the method of operating the equalizer is also disclosed.

Abstract translation: 公开了一种具有极快收敛性的自动均衡器。 权重设置过程或算法基本上是迭代操作，可以方便地通过级联均衡器来表示。 所使用的装置的一种形式包括多个均衡器级，它们在连续迭代之后改变其抽头设置（第一迭代调整第一均衡器级，第二次迭代调整第二均衡器级等），使得在n次迭代之后 给定初始失真D减少到最多D2。 还公开了涉及的算法和操作均衡器的方法。