Patent Document ID: 8605843
Application ID: 12672663
Patent Flag: 1

Claim One:
1. A method of signal acquisition in a communications receiver for receiving Orthogonal Frequency Division Multiplex (OFDM) signals comprising data packets each comprising a preamble training sequence having a periodic structure, the method comprising the steps of: (i) sampling a received OFDM signal to obtain received-signal samples; (ii) filtering said samples using a matched finite impulse response (FIR) filter having an impulse response matched to said periodic structure of said preamble training sequence; (iii) detecting occurrence of one or several peaks, the highest peak representing a maximum amplitude, of the cross-correlation output from said FIR over a predetermined number of periods corresponding to at least part of said preamble training sequence; and (iv) using one or more of timing, magnitude and phase of said maximum amplitude, to determine one or more of time synchronization, carrier frequency offset and channel estimation.