A method for suppressing impulse noise in a power line communication system

Abstract

The invention discloses a method for suppressing pulse noise in a power line communication system. The transmitting end sends out a discrete time-domain signal with a cyclic prefix; the receiving end acquires only A mixed signal containing asynchronous impulse noise and colored background noise; then use an iterative adaptive algorithm to estimate the spectral magnitude of the mixed signal; then calculate the mean and standard deviation of the spectral magnitude of the mixed signal, and use the Chauvier decision criterion to find out the mixed signal The high-amplitude points in the spectrum amplitude of the signal; and then by counting the total number of high-amplitude points in the spectrum amplitude of the mixed signal, the largest point in the discrete time-domain signal with asynchronous pulse noise interference after removing the cyclic prefix Multiple amplitude values ​​are set to 0 to complete the suppression of asynchronous pulse noise and obtain an effective signal; the advantage is that its pulse noise suppression performance is good, it has high robustness, and it can be well realized in the power line communication system.

Description

technical field [0001] The invention relates to an impulse noise estimation technique, in particular to a method for suppressing impulse noise in a power line communication system. Background technique [0002] In recent years, with the development of the smart grid and the advancement of communication technology, the power line communication (PowerLine Communication, PLC) using the smart grid has begun to develop towards high-speed, bi-directional and networked. As a well-established infrastructure, power lines have the characteristics of no need for repeated wiring and wide geographical distribution. Therefore, using them for data transmission can greatly reduce communication costs. However, since the power line design did not consider the transmission of data signals at the beginning, it basically does not have the electrical characteristics necessary for wired communication media, and there are problems such as poor system stability and serious noise interference, which ...

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Problems solved by technology

However, this type of method needs to estimate the statistical model of impulse noise, and a smaller or larger threshold value will lead to a serious decline in the performance of impulse noise suppression; at the same time, due to the relatively large peak-to-average value of the OFDM signal, it will cause some transmitted signals to have relatively large A high amplitude value will generate a false alarm when using the threshold value for judgment, and the transmitted signal that is not interfered by the impulse noise will be misjudged as the impulse noise signal, which will lead to the absence of the transmitted signal; in addition, the typical blanking method requires Set a fixed threshold value or use the signal-to-noise ratio and signal-to-interference-noise ratio at the input end to optimize the threshold value, but each has its own limitations. Use a fixed threshold value and change the signal-to-noise ratio or signal-to-interference-noise ratio at the input end , it will lead to a serious decline in the performance of impulse noise suppression; and the use of optimized thresholds requires prior knowledge of the signal-to-noise ratio and signal-to-interference-noise ratio at the input, which is difficult to achieve in actual power line communication systems

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