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Recently, the low-voltage powerline communication has become a hot research topic for electrical advancements. However, effective implementation of high-quality signal transmission over this kind of network presents difficulties, because of the unpredictable load effects, noise, high attenuation, reflection, and resonance effects. Furthermore, as the frequency of the reflection signal is the same as that of the sending signal, it is difficult to pick up the useful information from the received signal. This paper aims to find out an effective way to deal with this problem. Since there is phase difference between the reflection signal and the sending signal, the complex wavelet transform is used to get additional information. By use of the additional information, a novel method to obtain the useful signal is proposed. Experiment results show the effectiveness of the proposed method.