低压电力线通信信道特性

Characteristics of low voltage power line communication channels

低压电力线作为通信线路,其信道特性对通信质量具有重要影响,对低压电力线信道特性和信道建模问题做出分析,以期对电力线通信研究提供一定的理论依据。基于对国内外科学资料的分析归纳,得出电力线信道输入阻抗随频率的升高而呈上升趋势,电力线信道噪声由各种特定性质的噪声源叠加而成的,电力线信号的衰减是距离的函数并与频率有关,以及建立定量模型的可行性。通过该文研究低压电力线通信应建立在合适的通信频段并应采用具有强抗干扰措施的调制方式。

Using low voltage power line as communication channel, its channel characteristics will affect the quality of communication greatly.This paper analyses low voltage power line channel and channel modeling, in order to supply theoretical foundation for power line communication study. Based on the analysing and generalizing scientific data, this paper concludes that power line channel input impedance presents ascend trend following frequency arising, power line channel noise is repeated addition by varied noise sources, power line signal attenuation is the function of distance and related to frequency, and quantity modeling is impossible. Depending on the study of this paper, low voltage power line communication should select proper frequency channel and adopt modulation system possessing strong anti-interference characteristics.