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    • 2. 发明授权
    • Method and apparatus for detecting a data signal including repeated data
words
    • 用于检测包括重复数据字的数据信号的方法和装置
    • US4312074A
    • 1982-01-19
    • US119605
    • 1980-02-07
    • James A. PautlerKenneth A. Felix
    • James A. PautlerKenneth A. Felix
    • H04L1/08H03D1/00
    • H04L1/08
    • A method and detector are described for detecting a data signal including at least three repeated data words each preceded by a Barker word. The detector includes a microcomputer that is responsive to interrupt and correlation programs for receiving and timewise correlating the repeated data words in the data signal. Upon detection of each Barker word, the microcomputer stores the following data word and measures the elapsed time interval between data words by measuring the time between detection of Barker words. The elapsed time interval between the previously and presently received data words is added to the stored time interval of all previously received data words. If at least three of the received data words have corresponding stored time intervals that are correlated with predetermined time interval ranges, a correlation indication signal is provided to indicate that valid data words have been received. The inventive method and detector may be advantageously utilized in mobile and portable stations of a radio communication system for receiving high speed data on a noisy voice channel.
    • 描述了一种用于检测数据信号的方法和检测器,所述数据信号包括每个前面带有巴克词的至少三个重复的数据字。 检测器包括响应中断和相关程序的微计算机,用于接收数据信号中的重复数据字并对其进行时间相关。 在检测到每个巴克词后,微计算机存储以下数据字,并通过测量检测到巴克词之间的时间来测量数据字之间的经过时间间隔。 先前接收的数据字和当前接收到的数据字之间的经过时间间隔被添加到所有先前接收到的数据字的存储时间间隔。 如果所接收的数据字中的至少三个具有与预定时间间隔范围相关联的对应的存储时间间隔,则提供相关指示信号以指示已经接收到有效的数据字。 本发明的方法和检测器可以有利地用于无线电通信系统的移动和便携式站中,用于在噪声语音信道上接收高速数据。