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正交频分复用(OFDM)技术是目前低压电力线通信中的一项颇具应用前景的核心技术。文中针对OFDM技术的一个关键性问题——同步问题展开研究,分别对符号定时偏差、载波频率偏差和采样时钟频偏进行了详细分析,得到了同步偏差对低压电力线OFDM通信系统性能影响的定量指标,并结合实际的低压电力线通信系统进行了仿真计算分析,为OFDM同步方案的正确选择提供了有意义的定量参考。
Orthogonal Frequency Division Multiplexing (OFDM) technology is currently a promising core technology in low-voltage power line communications. Aiming at the synchronization problem, a key problem of OFDM technology is studied in this paper. Symbol timing deviation, carrier frequency deviation and sampling clock frequency deviation are analyzed in detail. The quantitative indexes of synchronization deviation on the performance of low-voltage power line OFDM communication system are obtained. , And combined with the actual low-voltage power line communication system simulation calculation and analysis for the correct choice of OFDM synchronization program provides a meaningful quantitative reference.