Research On Noise Elimination And Application Technology Of Low-voltage Power Line Communication Channel

Low-voltage power line communication technology does not require re-laying of lines,and has low economic cost,which provides an important guarantee for the safe and stable operation of low-voltage power systems.However,there is a lot of noise in the low-voltage power line communication channel,which causes serious damage to the communication system and affects the reliability of communication.Therefore,in order to guarantee the communication quality,it is necessary to study the noise cancellation technology of low-voltage power line communication channels.In order to study the noise cancellation technology of low-voltage power line communication channels,this paper studies the following three aspects.Firstly,based on the measured noise of the low-voltage power line communication channel,the noise characteristics and noise model of the low-voltage power line communication system are studied.Secondly,the low-voltage power line communication channel is a typical noisy channel with memory characteristics,and a memory noise model is established.Finally,aiming at the memory of the noise model,the time-frequency peak filtering algorithm is used to eliminate the noise,and the performance of the time-frequency peak filtering algorithm in the low-voltage power line communication system under different noise environments is studied.At the same time,in order to analyze the de-noising effect of the time-frequency peak filtering algorithm in the low-voltage power line communication system during the research process,the time-frequency peak filtering algorithm was simulated.To verify the application effect of this algorithm in low-voltage power line communication system,a test platform was set up in the laboratory,and hardware and software were designed.Finally,it was applied to the data transmission system of solar panels.Simulation and application results show that the proposed algorithm can improve signal-to-noise ratio by about 5dB under the actual low-voltage power line communication noise environment,and can adapt to the complex and variable environment of the channel noise,so it has good noise suppression effect and commercial application prospect.