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In this paper, the authors propose a simple and efficient two-stage list synchronizer for frame synchronization of Low-Density Parity-Check (LDPC) coded data transmitted over the Additive White Gaussian Noise (AWGN) channel. The proposed method uses both synchronization sequence and code constraints for frame synchronization. In the first stage, a list of the most likely frame starting positions is made using synchro-sequence, while in the second stage the code constraints are used to select the most likely position from the list. They analytically relate the synchro-sequence length, the frame length and the list length in order to keep the synchronization Frame Error Rate (FER) lower than the error-correcting FER of the LDPC code, and they investigate the trade-off between the sequence length and the list length.
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