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    • 4. 发明授权
    • Timing synchronization in a receiver employing orthogonal frequency
division multiplexing
    • 采用正交频分复用的接收机中的定时同步
    • US5953311A
    • 1999-09-14
    • US802328
    • 1997-02-18
    • David Huw DaviesJonathan ParkerAnthony Peter John Claydon
    • David Huw DaviesJonathan ParkerAnthony Peter John Claydon
    • H04L27/26H04J11/00H04J3/06
    • H04L27/2676H04L27/2662H04L27/265
    • A method and apparatus are disclosed for determining the boundaries of guard intervals of data symbols being received in a coded orthogonal frequency division multiplexed signal. Temporal samples separated by an interval of an active interval of a data symbol are associated in pairs, and difference signals obtained. The dispersion of a first comparison block of difference signals is determined, and compared to the dispersion of a second comparison block of difference signals, the second comparison block being displaced from the first comparison block by n samples. An F ratio is calculated for the dispersions of the two blocks. F ratios are iterated in a succession of comparison blocks, and a signal representing the F ratios subjected to peak detection. The peaks represent the boundaries of the symbol's guard interval. This information is utilized in synchronizing an FFT window for subsequent signal reconstruction.
    • 公开了一种用于确定在经编码的正交频分复用信号中接收的数据符号的保护间隔的边界的方法和装置。 通过数据符号的有效间隔的间隔分离的时间样本被成对地相关联,并且获得差分信号。 确定差分信号的第一比较块的色散,并且与差分信号的第二比较块的色散进行比较,第二比较块从第一比较块移位n个样本。 对于两个块的分散体计算F比率。 F比率在一系列比较块中迭代,并且表示经受峰值检测的F比的信号。 峰值表示符号保护间隔的边界。 该信息用于同步用于后续信号重建的FFT窗口。