电力线载波通信时频混合降噪方法

Noise Reduction Method for LV Power Line Carrier Communication

电力线干扰噪声是影响电力线载波通信（power line communication,PLC）传输质量的重要因素,直接降低电网信息物理系统的泛在感知和可靠传输性能。为提高电力线载波通信抗干扰能力,该文提出了一种低压电力线载波信号时频混合降噪方法。通过对电力线载波环境中五种常见噪声建模分析,结合载波调制方式,将载波信号降噪问题分解为信号频域降噪和载波时域降噪两步处理,并提出码元位置校验和幅值补偿操作,最终实现电力信号降噪的目的。仿真实验结果表明,该方法在不同编码模式和信道环境下都具有显著的降噪效果,且有很好的抗信号衰减性能,可有效提升信噪比。

Interference noise from power line is an important factor affecting transmission quality of power line communication（PLC）, directly reducing ubiquitous perception and reliable transmission performance of cyber physical system（CPS）. To improve anti-interference capability of PLC, a mixed time-frequency noise reduction method for LV PLC is proposed in this paper. In order to reduce the power signal noise, by modeling and analyzing five common noises in power line carrier environment and combining carrier modulation method, the carrier signal de-noising problem is decomposed into two steps： signal frequency domain noise reduction and carrier time domain de-noising, and bit position check and amplitude compensation operation are proposed. Simulation results show that this method has significant noise reduction effect in different coding modes and channel environments. It has good anti-signal-attenuation performance, and effectively improves signal-to-noise ratio.