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    • 7. 发明授权
    • Frame synchronization apparatus
    • 帧同步装置
    • US5680421A
    • 1997-10-21
    • US604832
    • 1996-02-22
    • Haruhiro ShiinoNorio YamaguchiToshimichi NaoiRyoichi Miyamoto
    • Haruhiro ShiinoNorio YamaguchiToshimichi NaoiRyoichi Miyamoto
    • H04L7/04H04L7/08H04L7/00
    • H04L7/042H04L7/08
    • A frame synchronization apparatus is applied to the TDMA (Time Division Multiple Access) communication system, particularly, where a plurality of transmission rates are available. The frame synchronization apparatus calculates correlations between sampled sequences of a received signal and an assigned sync sequence during the longest or shortest frame period in the plurality of transmission rates. The apparatus stores positions where the correlations exceed a given threshold. Then, the apparatus sets a search gate at a position after a lapse of the longest or shortest frame period from each of those positions. The apparatus calculates correlations between the sync sequence and sampled sequences of the received signal for all the search gates. The actual transmission rate is determined from the plurality of transmission rates based on a time interval of positions where the correlations beyond a second threshold were detected. Synchronization is thus established.
    • 帧同步装置被应用于TDMA(时分多址)通信系统,特别是在多个传输速率可用的情况下。 帧同步装置在多个传输速率的最长或最短帧周期期间,计算接收信号的采样序列与分配的同步序列之间的相关性。 该装置存储相关性超过给定阈值的位置。 然后,该设备在从这些位置中的每个位置经过最长或最短帧周期之后的位置处设置搜索门。 该装置计算所有搜索门的同步序列和接收信号的采样序列之间的相关性。 基于检测到超过第二阈值的相关性的位置的时间间隔,从多个传输速率确定实际传输速率。 因此建立同步。