A novel time synchronization scheme for OFDM systems based on variational Pseudo-noise preamble

The symbol timing synchronization inaccuracy can bring about phase offset (FO), inter-symbol interference (ISI) and inter-channel interference (ICI). To overcome these shortcomings as much as possible, in this paper, a novel symbol timing synchronizer is proposed for orthogonal frequency division multiplexing (OFDM) systems based on the properties of PN sequences. It is demonstrated by the computer simulations that the proposed scheme achieves accurate timing offset estimation with smaller error mean (EM) and standard deviation (SD) compared with the existing method under flat-fading channels and perform relatively good over frequency-selective fading (FSF) channels.