摘要
电力线通信信号包含大量噪声干扰,这些噪声严重干扰电力线通信,为此,提出一种改进阈值法和平移不变小波相结合的消噪方法。该方法对含噪的电力线通信信号进行小波分解,对分解后不同尺度下的小波信号进行平移不变并同时按改进阈值法进行处理,最后重构信号。以实测信号为例,提取去噪前后信号波形和误码率2个特征量,与传统消噪方法相比较,结果表明,该方法实现了高信噪比的合理消噪,且在误码性能和消噪效果上更具优势。
As the useful signal for power line communication（PLC） is usually affected by the noise to some extent,a scheme of wavelet threshold de-noising method associated with translation invariant wavelet is proposed in this paper.Firstly,the power line signals with noises are wavelet decomposed.Then,the wavelet signals are treated by translation invariant wavelet and improved wavelet threshold de-noising method.Lastly,the PLC signals are reconstructed.Take on-site original signals for example,the waveforms and bit error rate（BER） are acquired.The research has concluded that the improved scheme proposed by this paper archives reasonable de-noising with high signal-to-noise ratio（SNR）.Analysis and comparison results show that the scheme has more advantages in de-noise and BER effects compared with the existed methods.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2011年第1期64-68,共5页
Proceedings of the CSU-EPSA
关键词
电力线通信
小波
消噪
阈值
平移不变量
power line communication
wavelet
de-noise
threshold
translation invariant
