Invention Grant
US07990845B2 System and method for FFT window timing synchronization for an orthogonal frequency-division multiplexed data stream 有权
用于正交频分复用数据流的FFT窗口定时同步的系统和方法

System and method for FFT window timing synchronization for an orthogonal frequency-division multiplexed data stream
Abstract:
A system and method for determining an FFT window location for reception of an OFDM signal received over a transmission channel. The OFDM signal includes a plurality of symbols each having a guard interval. The system includes a correlation module that determines a location of maximum correlation in a first symbol, an FFT module to perform an FFT on the OFDM signal based upon an initial FFT window location, and an adjustment module. The adjustment module determines a plurality of permissible echo location options based upon the initial FFT window location, selects a permissible echo location option that corresponds most closely to the location of maximum correlation, and adjusts the initial FFT window location based upon the selected permissible echo location option so that the adjusted FFT window location includes substantially all of a useful symbol length of the first symbol while a maximum number of echoes are included within the guard interval of the first symbol.
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