低压电力线载波通信中信号反射现象的复小波研究  

ANALYSIS OF REFLECTION OF SIGNAL TRANSMITTED IN LOW VOLTAGE POWERLINE WITH COMPLEX WAVELET

作　　者：何海波[1] 张有兵[1] 程时杰[1] 

机构地区：[1]华中科技大学电力工程系,湖北武汉430074

出　　处：《中国电机工程学报》2002年第6期11-15,共5页Proceedings of the CSEE

基　　金：中华电力教育基金会许继奖教金项目。

摘　　要：摘要:低压电力线载波通信技术目前已引起了广泛的关注和研究。由于低压配电网络结构的复杂性以及线路阻抗不匹配等固有的缺陷,使得信号在低压电力线中传输时存在反射现象。由于反射信号与原信号具有同一频率,使得传统的信号分析方法在有效提取信号时遇到麻烦。该文通过分析低压配电网中反射现象的成因以及信号的相位信息特征,提出利用复小波的分析方法来解决这一问题。在已有文献研究结果的基础上,构造了两种新的复合信息。仿真研究表明,采用该文提出的方法能得出满意的信号处理结果。Recently the Low Voltage PowerlineTelecom-munication has become a hot research topic forelectrical advancements. However, effective implementation of the high quality transmission signal over this network remains a difficult issue, because of some drawbacks such asunpredictable load effects, noise,high attenuation,reflection and resonance effects. Furthermore, because the reflectionsignal has the same frequency with the original one, it isdifficult to identify the useful information from the receiving signal by general methods. This paper aims to find out aneffective method to deal with this problem. Since the reflection signal has a phase difference with the orignial one, we use complex wavelet transform to get the phase information and some other simple information. By this means, this paper also proposes two novel complex information by combining thesimple information. Simulated applications in low voltage powerline communica-tion system show the effectiveness ofthe proposed method.

关 键 词：低压电力线载波通信 信号 反射现象 复小波 

分 类 号：TN925[电子电信—通信与信息系统]