Coarse Frame Synchronization for OFDM Systems Using SNR Estimation
In wireless Orthogonal Frequency Division Multiplexing (OFDM) systems, coarse frame synchronization and Signal-to-Noise Ratio (SNR) values are two crucial parameters for OFDM receivers. In this paper, the authors develop a coarse timing estimator to overcome the plateau phenomenon by using delayed correlation between two estimated SNR values. The training symbol is designed for multiple pieces instead of two parts to mitigate the Doppler effect for SNR estimation. Compared with the Minn's scheme, their proposed scheme has smaller estimation variance both in EVA and ETU channels, which can also provide an estimated SNR value in the time domain.