【摘要】 利用电力线路传输信息不需要架设通信线路,可以方便地实现电力营销的自动化,甚至组建新的Internet物理层信息载体。但由于电力线路存在着强噪音、信道衰减等原因,严重影响了通信质量。小波包变换是基于小波变换的进一步发展,能够提供比小波变换更高的分辨率。文中介绍了一种对电力通信信号进行消噪的小波包分析方法,从小波包的构造、小波的选择和去噪阀值的确定等几个方面来进行阐述。通过利用DaubechieS构造的具有紧支撑的db小波所构造的小波包变换和小波变换算法的对比来对实际数据进行处理,证明了该方法的可行性。更多还原

【Abstract】 It needn’t build other communication line for transmitting information by the power line and it can achieve the automation of power market easily even build new physical layer information carrier for Internet.But, there exists serious noise and channel attenuation in power line and they affect the quality of communication seriously.Wavelet packet transformation is the further development of Wavelet transformation and it can offer better resolution than Wavelet transformation.The paper presents a denoising method based on Wavelet packet transformation for power line communication and elaborates this method from Wavelet packet construction, Wavelet function choice and denoising threshold determination.The author makes use of db Wavelet function built by Daubechies to disposal actual data, then proves feasibility of the method.更多还原