An adaptive coarse time synchronization method for factory automation in wireless control network based on OFDM systems over fading channels

摘要

An accurate estimation of symbol timing is significant for orthogonal frequency division multiplexing (OFDM) since the symbol timing inaccuracy will lead to phase offset (FO), inter-symbol interference (ISI) and inter-channel interference (ICI). In this letter, a metric function has been designed by taking advantage of the correlation properties of OFDM signals. Computer simulation results show that the scheme is superior because it gets a larger probability that fall into the ISI and ICI free region and has lower computational complexity compared with the conventional methods over frequency-selective channels, which can be used for factory automation (FA) in wireless control network (WCN).