OFDM frame synchronization based on energy difference of the received preamble

The article presents a novel orthogonal frequency division multiplexing (OFDM) frame synchronization method. The method uses the preamble that contains two identical halves, and the energy difference of the two similar parts of the received preamble in receiver is used to obtain the frame's correct starting point Furthermore, an improvement of the proposed method is presented, which uses the preamble that can be divided into four similar portions, and the energy difference of the four similar parts of the received preamble in receiver is used to obtain the frame's correct starting point. The performances of the frame synchronization methods in multipath channel are compared in terms of mean square error (MSE) obtained by simulations. It can be seen from the simulation results that the proposed methods have better performances than Schmidl's, Minn's, and Park's method in multipath channel.