Joint Symbol Timing Estimation and Carrier Phase Synchronization for OFDM based WLAN Systems

In this paper, a joint symbol timing estimation and carrier phase synchronization method for Orthogonal Frequency Division Multiplexing (OFDM) system is implemented for a Wireless Local Area Network (WLAN). Earlier approaches for symbol timing estimation make use of correlation of samples within the preamble. So preamble should be chosen with good autocorrelation property. Thus estimation method directly depends on the preamble. The implemented method for timing estimation in this paper is preamble independent. This method can be applied for any preamble structure and this scheme gives more accurate estimate of symbol timing. Also a method for carrier phase recovery is implemented in OFDM WLAN system. This algorithm for carrier phase compensation can effectively recover Residual Frequency Offset (RFO) and phase in the presence of Inter Carrier Interference (ICI). This scheme for symbol timing and carrier phase recovery is analyzed for WLAN environment and simulation results are shown.