Hybrid blind synchronization for LDPC coded system

In this paper, we analyze the performance of the blind synchronizer based on syndrome checks using hard decisions for low density parity check (LDPC) code and give a method to compute frame synchronization error (FSE) bound. Only some kinds of LDPC codes are suitable to attain perfect synchronization. We present a two-step hybrid blind synchronizer using both hard and soft decision. Simulation results show that the complexity and performance of the hybrid synchronizer is just between the two previous synchronizers.