System and method for determining synchronization point in OFDM modems for accurate time of flight measurement
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United States of America Patent
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Oct 3, 2006
Grant Date -
Dec 16, 2004
app pub date -
Jun 7, 2004
filing date -
Jun 5, 2003
priority date (Note) -
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Abstract
A system and method including an algorithm that can use the linear time shift property of the subcarrier modulation to provide accurate frame synchronization for communications between nodes in a wireless network, where nodes employ orthogonal frequency division multiplexing (OFDM) modems. The subcarrier modulation is typically performed with a Fast Fourier Transform (FFT) that includes a time shift between Inverse Fast Fourier Transform (IFFT) and guard interval insertion at transmission, but due to the guard insertion, the system and method of the present invention corrects the time shifts allowing accurate TOF calculations.
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