CAJ | 학술논문

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2 dB的性能改善，适用于低信噪比的电力线通信环境。
분석료신조비여정시동보역치지간적관계，의합출료일조최우동보역치곡선，병제출료일충자괄응정시동보역치선택방법。해방법괄용우소유수거보조동보계통，장해방법응용우저압전력선정교빈분복용(OFDM)재파통신계통，용이대항전력선악렬적신도배경，제고정시동보성능。방진결과표명，해방법동보성능명현우우고정역치적본지상관산법，정오검측개솔접근최우역치곡선，비고정역치방법유2 dB적성능개선，괄용우저신조비적전력선통신배경。
Based on an analysis of the relationship between the signal-to-noise ratio and the threshold of timing synchronization, an optimal threshold curve of timing synchronization is fitted, and an adaptive threshold selection method of timing synchronization is proposed.The method applicable to all data-aided timing synchronization systems is applied to the lower-voltage orthogonal frequency division multiplexing (OFDM) power line carrier communication system to resist the harsh channel situation of power line and improve the timing synchronization performance.Simulation results show that the method outperforms the local relevant algorithm of fixed threshold with its frame error detection probability close to the optimal threshold curve.With its 2 dB function improvement than the fixed threshold method,this method is suitable for a power line communication environment with a low signal-to-noise ratio.