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Power line communication (PLC) technology is an important communication method widely used in Smart grid. Noise seriously affects the reliability of power line communication. In this paper, channel noises of power line and attenuation of the distribution transformer in high frequency are measured and the noise characteristics are analyzed. This paper first puts forward considering the Low-Voltage (LV) feedback noise coupling through distribution transformer in Medium-voltage (MV) side. Considering the feedback noise, this paper gives an overview of the modeling of distribution transformers in high frequency and deals with the research methods of high frequency noise propagation characteristic through the transformer.

Orthogonal Frequency Division Multiplexing (OFDM) is a promising technology for combating the frequency selective fading, multipath propagation, and narrowband interference in power line communication. However, OFDM systems are extremely sensitive to synchronization deviation. Slight synchronization deviation can affect the performance of OFDM systems. This paper presents a design and implementation synchronization algorithm based on constant amplitude zero auto-correlation (CAZAC) for power line communication. Matlab simulation prove that, with less computation, the proposed algorithm can complete symbol timing synchronization and frequency offset synchronization well and the performance of OFDM synchronization in power line communication is significantly improved.