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1.发明公开OFDM receiving system for performing system timing synchronization using guard interval and method for the same 有权OFDM接收系统，用于使用保护间隔执行系统定时同步以及用于该方法的方法
公开(公告)号：EP1276289A3
公开(公告)日：2003-06-04
申请号：EP01130993.7
申请日：2001-12-28
CPC分类号： H04L25/03006 , H04L27/2607 , H04L27/261 , H04L27/2662 , H04L27/2679
摘要： An orthogonal frequency division multiplex (OFDM) receiving system for changing a fast Fourier transform (FFT) window period using a guard interval, and a method for the same are provided. The method includes extracting scattered pilots, which are inserted into a symbol at intervals of predetermined samples, from a received OFDM signal, estimating a symbol timing offset using the extracted scattered pilots and setting a symbol timing synchronization point in the data transmission interval, and adding samples in a predetermined interval in the data transmission interval to samples in an interval obtained by subtracting a predetermined length from the useful symbol interval starting from the symbol timing synchronization point and performing FFT with respect to the result of addition. Accordingly, symbol timing synchronization and channel equalization can be accurately performed without having ISI even when a symbol start point is not correctly decided under a multi-channel (or a Rayleigh channel) or a pre-ghost channel environment.
摘要翻译： 提供了使用保护间隔来改变快速傅里叶变换（FFT）窗口周期的正交频分复用（OFDM）接收系统及其方法。 该方法包括：从接收到的OFDM信号中以预定样本的间隔提取插入到符号中的散布导频，使用提取的散射导频估计符号定时偏移并且在数据传输间隔中设置符号定时同步点， 将数据发送间隔中的预定间隔中的样本采样到通过从码元定时同步点开始的有用码元间隔中减去预定长度而获得的间隔中的样本，并且针对相加结果执行FFT。 因此，即使在多信道（或瑞利信道）或预重影信道环境下未正确决定符号开始点时，也可以在不具有ISI的情况下准确地执行符号定时同步和信道均衡。
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