Patent ID: 8670429

Claim:
A method of detecting a synchronization signal from a received signal in an Orthogonal Frequency Division Multiplex (OFDM) based communication system, the method comprising the steps of: detecting a first primary synchronization signal; receiving a signal Y from a communication channel, the signal Y being a OFDM signal comprising a set of subcarriers; and performing a second synchronization detection among a set of M predetermined synchronization sequences S m (m=0 to M−1), the second synchronization detection comprising the further steps of: for each predetermined sequence S m , computing a vector Z m from the received signal Y in accordance with the formula Z m [i]=S m [i]Y[i], where S m [i], Y[i] and Z m [i] are the element (i) of sequence S m , the received signal Y and the computed vector Z m , respectively; computing at least one of a vector T m and U m by multiplying the symbol in one subcarrier by the complex conjugate of the symbol in the first or second consecutive subcarriers, respectively; and maximizing or minimizing a cost function applied on the vector T m or U m in order to determine the particular sequence yielding the best cost function.