Patent ID: 7606333
Filing Date: 2009-10-20
Classification: H04L

Abstract:
1. A method for detection of the reception of a data frame in an input signal (Y OFF (n)), said data frame comprises periodically repeated symbols at the beginning, comprising the steps of a) sampling said input signal (Y OFF (n)) with a predetermined sampling rate, b) generating a first signal (|J(k)| 2 ) that is dependent on an autocorrelation of said input signal with a delay copy of said input signal, c) detecting a plateau in said first signal (|J(k)| 2 ), and d) generating an output signal that is indicative of detecting said plateau, plateau, wherein said step of detecting a plateau comprises the steps of c1) generating a differentiator signal (J DIFF (k)), which is dependent on rhea difference of a first sample of said first signal and a second sample of said first signal that was taken a first predetermined number of sampling periods earlier, and c2) detecting an absolute maximum of said differentiator signal (J DIFF (k)) within a second predetermined number of sampling periods, further comprises a step of detecting a falling slope in said differentiator signal (J DIFF (k)), wherein detecting a falling slope comprises the step of generating an accumulation signal that is dependent on the sum of said differentiator signal (J DIFF (k)) over a fourth predetermined number of consecutive sampling periods, comparing said current accumulation signal with the last previous accumulation signal representing without overlap said fourth predetermined number of consecutive earlier sampling periods, and generating a group peak detection signal indicative of whether or not the value of said current accumulation signal is smaller than the value of said earlier accumulation signal.