公开(公告)号：US3890572A

公开(公告)日：1975-06-17

申请号：US43742974

申请日：1974-01-28

Applicant: IBM

Inventor： DESBLANCHE ANDRE EUGENE ,  PIERRET JEAN MARC

IPC: H04B3/06 ,  H03H15/00 ,  H03H17/00 ,  H03H21/00 ,  H04L27/01 ,  H04L27/22 ,  H04L27/18

CPC classification number: H04L27/01

Abstract: A method of equalizing a phase modulated signal and apparatus for doing so without a frequency field transfer are disclosed. The input signals are fed through a variable transfer transversal filter for obtaining an equalized signal; an error adjustment signal is generated by comparing the output from the transversal filter with a reference signal at time instants defined by a clock which generates timing signals at the data bit rate. The transfer function of the transversal filter is then adjusted for minimum error. The method of generating the error signal includes steps of extracting the carrier frequency from the received signal; generating from the extracted carrier frequency n possible reference signals, and selecting from said n reference signals the particular one to be used at a given characteristic instant.

Abstract translation: 公开了一种均衡相位调制信号的方法和用于不进行频率场传输的装置。 输入信号通过可变传输横向滤波器馈送以获得均衡信号; 通过将来自横向滤波器的输出与由以数据比特率产生定时信号的时钟定义的时刻的参考信号进行比较来产生误差调整信号。 然后调整横向滤波器的传递函数以获​​得最小误差。 产生误差信号的方法包括从接收信号中提取载波频率的步骤; 从所提取的载波频率n产生可能的参考信号，并从所述n个参考信号中选择要在给定特征时刻使用的特定的参考信号。