Patent ID: 7729435
Filing Date: 2010-06-01
Classification: H04L

Abstract:
1. A method of detecting Null symbols in a video data frame, said method comprising: receiving orthogonal-frequency-division-multiplexing (OFDM) symbols; sending said 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 Fast Fourier Transform (FFT) size of said OFDM symbols, wherein peaks of the output of the sliding windowed correlation process occur at locations where two similar portions of said OFDM symbols coincide; checking peaks in windows of a size equal to a duration of an OFDM symbol; determining whether said peaks are located in a middle region of said windows; determining whether a shift has occurred in the location of said peak of a current window (i) as compared to that in a second immediately previous window (i- determining whether said peak in a first immediately previous window (i- declaring that a Null symbol exists in said first immediately previous window (i-