计及码元特性的电力线载波通信降噪算法

De-noising Method for Power Line Carrier Communication Considering Symbol Characteristics

电力线干扰噪声是影响低压电力线载波通信质量的重要因素。为提高电力线载波通信抗干扰能力,提出了一种新型载波信号降噪算法。针对电力线载波中的噪声进行分析,将载波信号降噪问题转换为信号的频域分离问题,同时结合码元特征实现电力信号重构,最终达到信号降噪的目的。仿真实验结果表明,与基于多分辨率的小波包降噪方法相比,该方法在不同信道条件下降噪效果显著,具有方法简单、可有效提升信噪比的优势。

Power line interference noise is an important factor affecting the quality of low-voltage power line carrier communication.To improve the anti-interference capability of power line carrier communication,a novel carrier signal denoising method is proposed in this paper.The noises in power line carrier are analyzed,and the problem of carrier signal de-noising is converted into the frequency domain separation problem of signals.At the same time,the power signal is reconstructed with the combination of symbol characteristics,and finally the purpose of noise reduction is achieved.Simulation results show that compared with the wavelet packet denoising method based on multiple resolutions,the proposed method has a significant de-noising effect under different channel conditions;moreover,it is simple and can improve the signal-to-noise ratio effectively.