But, there exists serious noise and channel attenuation in power line and they affect the quality of communication seriously.
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。
The characteristics of power line channel are the foundation of designing the low voltage power line carrier communication system.
低压电力线信道特性是设计低压电力线载波通信系统的基础。
The design of reliable high speed communication systems for power line communication (PLC) requires an accurate knowledge of such channel specific characteristics as attenuation, impedance and noise.
为了设计基于电力线通信（ PLC）的高速可靠通信系统，必须了解衰耗、阻抗、噪声等电力线信道特性。
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