A OFDM frame synchronization method based on IEEE802.11a, which belongs to the wireless digital communication technology, which comprises the following steps: receiving the data signal by the delay correlation algorithm to achieve the coarse timing synchronization frame, to get the coarse frame synchronization signal; data signals through the coarse frequency offset module and fine frame timing module, realize fine frame timing synchronization through cross correlation algorithm, fine frame timing synchronization signal; effective data start signal payload and the data arrival counting signal count combined control signal; data start signal payload control to the cyclic prefix to make the data FFT algorithm and channel estimation, calculation of data arrival counting signal carrier frequency offset count control; data signal control cycle to start the prefix CP to make FFT operation data and channel estimation. The invention reduces the complexity and improves the accuracy, and solves the problem of divergence and rotation of the data constellation diagram.
【技术实现步骤摘要】
【技术保护点】
１．一种基于ＩＥＥＥ８０２．１１ａ的ＯＦＤＭ帧定时同步方法，由无线实时传输系统实现，该系统包括发送装置、接收装置，其中发送装置包括发送端开发板和发送端计算机，发送端开发板和发送端计算机相连；接收装置包括接收端开发板和接收端计算机，接收端开发板和接收端计算机相连，该方法步骤如下：１）无线实时传输系统接收机接收数据信号，通过延迟相关算法实现粗帧定时同步，得到粗帧定时同步信号；延迟Ｎｄ个样值的两个相同训练序列，因其自相关函数Ｒ（τ）在τ＝０时达到最大值，所以寻找Ｒ（τ）的最大值，也就是找到最佳定时时刻，这种算法也称之为延迟相关算法，具体步骤如下：（１）接收到的数据经过延迟自相关得到相关值Ｃｎ＝ｒｎ＋ｋｒ＊ｎ＋ｋ＋１６（ｒｎ＋ｋ为接收的第ｎ＋ｋ个数据），所得值经过相减累加得到（２）接收到的数据经过取模操作得到能量值能量值经过相减累加得到（３）定义判别变量Ｍｎ＝（Ｐ１ｎ）２＞｜Ｃ１ｎ｜２，若Ｍｎ＝１则粗帧定时时刻来到，其高电平１会持续一个Ｎｄ＊９的平台；从而得到粗帧定时同步信号；２）无线实时传输系统接收机接收数据信号，得到纠正频偏后的数据信号；３）纠正频偏后的数据信号，通过互相关算法实现细帧定时...
【技术特征摘要】
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