Timing Error Estimation in OFDM Based wireless Communication System Using Matched Filter

In Orthogonal Frequency Division Multiplexing (OFDM) System time and frequency synchronization are important issues to be solved. This project is focused on time synchronization of OFDM system. Timing synchronization means estimation of timing error followed by correction of timing error. Timing error if present causes misalignment of FFT window and if timing synchronization is not performed with sufficient accuracy, the orthogonality among the subcarriers is lost, and the communication system suffers from intersymbol interference (ISI) and intercarrier interference (ICI). For the timing error estimation in OFDM system the training symbols with good autocorrelation properties are required. Matched filter can then be used for estimation of the error by performing matched filtering between received signal and the training signal generated at the receiver. In this project the performance of matched filter based timing error estimator will be verified in MATLAB using some parameters like probability of correct detection, mean square error etc. Also BER analysis will be done.