中文摘要：

利用LDPC码的编码约束条件,提出了一种LDPC码辅助的帧同步算法.这种帧同步算法不需要插入任何导频符号,分别通过计算LDPC译码前和译码后校验方程满足的比例,对数据帧的起始位置进行有效捕获和跟踪.仿真结果表明,基于LDPC码约束条件的帧同步捕获算法在较高信噪比下可以获得很好的捕获性能;基于LDPC码辅助的帧同步跟踪算法,其对帧起始位置的跟踪性能明显优于基于LDPC码约束条件和基于导频符号的帧同步算法.

英文摘要：

A novel frame synchronization algorithm was proposed based on low density parity check（LDPC）code constraints.At frame acquisition stage,the start of frame was obtained by using LDPC code constraints.At frame tracking stage,the start of frame was tracked by using decoding information from the output of LDPC decoder.Simulation results show that LDPC code constraints based frame acquisition performs well at relatively high signal-to-noise ratio（SNR）.LDPC code-aided frame tracking algorithm outperforms the code constraints-based algorithm and pilot-aided algorithm.