Blind estimation of symbol timing and carrier frequency offset in LOFDM systems

Blind synchronization algorithm is developed for estimating jointly timing and carrier frequency offset of Lattice Orthogonal Frequency Division Multiplexing (LOFDM) systems, which is based on the cyclostationarity of LOFDM signals. The theoretical analysis shows that the following characters are occupied by the proposed algorithm. The proposed estimators can effectively combat the fading caused by the frequency selective slowly time-varying channels. In the case of wide-sense stationary noise, the performance of the estimators is independent of Signal-to-Noise Ratio (SNR) received, and then they operate well in low SNR. Moreover, the performance of the symbol timing estimator and that of carrier frequency offset estimator do not influence each other. Finally, simulation results demonstrate the performance of the presented estimators.