公开(公告)号：US07729435B2

公开(公告)日：2010-06-01

申请号：US11834712

申请日：2007-08-07

申请人： Mahmoud H. Ismail ,  Waleed Youris ,  Maged F. Barsoum ,  Nabil Yousef

发明人： Mahmoud H. Ismail ,  Waleed Youris ,  Maged F. Barsoum ,  Nabil Yousef

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L27/2656 ,  H04L27/2678

摘要： Detecting Null symbols in a video data frame comprises sending OFDM symbols through a sliding windowed correlation process having a correlation window length proportional to a cyclic prefix length and a delay equal to a FFT size of the symbols, wherein output peaks of the process occur where two similar portions of the symbols coincide; checking peaks in windows sized equal to a duration of a symbol; determining whether the peaks are located in the middle of the windows; determining whether a shift has occurred in the location of the peak of a current window compared to in a second immediately previous window; determining whether the peak in a first immediately previous window is weak compared to that in a second immediately previous window; and declaring that a Null symbol exists in the first previous window when the shift has occurred and the determination of a weak peak exists.

摘要翻译： 检测视频数据帧中的空符号包括通过具有与循环前缀长度成比例的相关窗口长度和等于符号的FFT大小的延迟的滑动窗口相关处理来发送OFDM符号，其中过程的输出峰值发生在两个 符号的相似部分重合; 检查窗口大小等于符号持续时间的峰值; 确定峰是否位于窗的中间; 确定当前窗口的峰值位置与第二个紧接在前的窗口相比是否发生位移; 确定在第一紧邻前一窗口中的峰值是否比在第二紧接的前一窗口中的峰值弱; 并且当发生移位并且存在弱峰值的确定时，声明在第一先前窗口中存在空符号。