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针对电力线通信中多普勒频移为零以及具有一定拓扑结构的电力线信道中由多径反射所产生的时延扩展较移动信道而言相对稳定的特点,这里在最大似然(ML)类算法的基础上,实现了基于电力线信道的改进的正交频分复用技术(OFDM)同步算法。该方法有效的弥补了ML类算法不适合具有多径效应的电力线信道的不足。理论分析和仿真结果表明,该算法在电力线信道中具有良好的定时估计和频率偏移估计性能,而且计算量减少。
Aiming at the characteristics that the delay spread caused by multipath reflections in power line channels with zero power of Doppler shift in power line communication and with certain topological structure is relatively stable compared to mobile channels, Based on the power line channel to achieve improved Orthogonal Frequency Division Multiplexing (OFDM) synchronization algorithm. This method effectively makes up for the shortage that ML class algorithm is unsuitable for power line channel with multipath effect. Theoretical analysis and simulation results show that the proposed algorithm has good timing estimation and frequency offset estimation performance in power line channel, and the computation is reduced.