The invention relates to an improved method for timing synchronization of a OFDM system in a multipath channel. The improved method comprises: calculating the preamble sequence and the sender sends communication system receiver to receiver signal cross-correlation value; in order to search the receiver signal cross-correlation value and to determine the first two preamble sequence; based on the previous two find the preamble sequence, open the window to find subsequent preamble sequence, and the window all is greater than the threshold timing cross-correlation value recalculated, new cross-correlation value; according to the new cross-correlation values to determine the position of the window timing. The invention can effectively solve the performance degradation problem caused by multipath peak value judgment errors caused by multipath channels.
【技术实现步骤摘要】
【技术保护点】
一种多径信道下ＯＦＤＭ系统定时同步的改进方法，其特征在于，所述改进方法包括： 步骤１０１：计算通信系统接收端信号的前导序列和发送端发送到接收端信号的互相关值ｃｏｒｒ； 步骤１０２：依次搜索接收端信号的互相关值ｃｏｒｒ并确定最前面两个前导序列位置； 步骤１０３：在找到前面两个前导序列位置的基础上，开窗寻找后续前导序列，并将窗内所有大于定时同步阈值的互相关值重新计算，得到新的互相关值ｃｏｒｒ＿ｎｅｗ； 步骤１０４：根据新的互相关值ｃｏｒｒ＿ｎｅｗ确定定时同步的开窗位置。
【技术特征摘要】
【专利技术属性】
技术研发人员：黑勇，李春阳，乔树山，
申请(专利权)人：中国科学院微电子研究所，
类型：发明
国别省市：11
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