低压电力线正交频分复用系统同步问题的量化研究

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。

INFLUENCE OF SYNCHRONIZATION ERRORS ON OFDM BASED COMMUNICATION SYSTEM FOR LOW VOLTAGE POWER LINES

There are stili many problems to be solved in the orthogonal frequency division multiplexing (OFDM), which is a promising crucial technique in low voltage power line communication. This paper focuses on the synchronization, which is the key problem in OFDM technique. The synchronization errors, including timing, carrier frequency and sampling clock frequency errors, are separately analyzed. A quantitative index for measuring the influence of synchronization errors on the OFDM based low voltage power line communication system is deduced and applied in a practical system. It is shovvn that the method proposed provides an analytical tool necessary to quantify the performance of OFDM systems by taking into consideration the synchronization errors indicated above.