Method and system for dynamically suppressing power line impulse noise

Abstract

The invention discloses a method and system for dynamically suppressing power line impulse noise. A power line impulse input code stream is modulated, and part of peak values of each OFDM symbol that are obtained are quantized and coded, and are then input to a power line channel together with the OFDM symbols; a receiving end receives signals on a power line, the abovementioned part of peak values are recovered from coded signals, an average value of the peak value information is calculated, a received OFDM symbol sampling value is compared with the average value, thereby judging the magnitude of noise; three different noise suppression methods of deep amplitude limiting, amplitude limiting and blanking are used to process each OFDM symbol according to difference of the magnitude of noise; and blanking and amplitude limiting thresholds of the three noise suppression methods are determined by using a threshold value optimization method, and data after processing is completed are sent to an OFDM demodulation module. The method for dynamically suppressing the power line impulse noise adopts different noise suppression methods to process noise according to different situations of the magnitude of impulse noise. The deep amplitude limiting method keeps the basic features of signals; the blanking method performs zero setting on detected impulse noise, and immediately eliminates interference among the signals without affecting system performance; and the amplitude limiting mode is easy to realize.

Description

technical field [0001] The invention relates to a dynamic suppression method and system for power line pulse noise. Background technique [0002] In the industrial field environment, there are often various impulse noises. When the external interference changes, the severity of the impulse noise is also different. The suppression method handles the noise to achieve the optimal performance of the system. The signal blanking and clipping method has achieved good results in power line impulse noise suppression. However, in a moderate impulse noise environment, if the noise is simply clipped, the performance of the system will not be optimal. , in a heavy noise environment, if the noise is simply blanked, a large number of useful signals will be lost, and the performance of the system will be seriously degraded or even unable to work. [0003] Power line communication is one of the most attractive technologies to realize the smart grid. The biggest advantage of this technology...

AI Technical Summary

Problems solved by technology

This method is prone to secondary distortion in the process of filtering subcarriers with filters, and the output results need to be compensated

[0006] There are various methods for suppressing power line noise in the prior art, and they can all suppress power line noise under certain circumstances, but these methods all have a common shortcoming, and they all need to be based on the known characteristics of impulse noise However, it is impossible to flexibly suppress the noise according to the characteristics of the noise

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