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分析了信噪比与定时同步阈值之间的关系,拟合出了一条最优同步阈值曲线,并提出了一种自适应定时同步阈值选择方法。该方法适用于所有数据辅助同步系统,将该方法应用于低压电力线正交频分复用(OFDM)载波通信系统,用以对抗电力线恶劣的信道环境,提高定时同步性能。仿真结果表明,该方法同步性能明显优于固定阈值的本地相关算法,帧误检测概率接近最优阈值曲线,比固定阈值方法有2dB的性能改善,适用于低信噪比的电力线通信环境。
The relationship between SNR and timing synchronization threshold is analyzed, an optimal synchronization threshold curve is fitted, and an adaptive timing synchronization threshold selection method is proposed. This method is suitable for all data-assisted synchronization systems. The proposed method is applied to low-voltage power line Orthogonal Frequency Division Multiplexing (OFDM) carrier communication systems to combat the harsh environment of power lines and improve the timing synchronization performance. The simulation results show that the proposed method has better synchronization performance than the fixed-threshold local correlation algorithm, and the frame error detection probability is close to the optimal threshold curve. Compared with the fixed threshold method, it has 2dB performance improvement and is suitable for low signal-to-noise ratio power line communication environment.