Real-time Detection and Suppression Method of Power Line Impulse Noise

Abstract

The invention discloses a real-time detection and suppression method of power line pulse noise, comprising: setting pulse thresholds M1, M2, M3, M4 according to the peak value and mean value of the original OFDM symbol corresponding to the baseband signal of the transmitting end under a typical modulation mode; The input sampling data is compared with the pulse thresholds M1 and M2 in amplitude, and the count value of the pulse counter is increased, decreased or kept unchanged according to the amplitude comparison result; the count value of the pulse counter is compared with the count threshold, and Set the pulse detection limit flag and the pulse detection zero flag according to the comparison result; according to the state of the pulse detection limit flag and the pulse detection zero flag and the amplitude comparison results of the subsequent sampling data and the pulse thresholds M3 and M4, the follow-up sampling data is performed. Clipping or Unslicing. The real-time detection and suppression method has relatively high detection accuracy for pulse noise, relatively good suppression effect, fast processing speed and small circuit area occupied by the method.

Description

technical field [0001] The invention relates to the field of power line carrier communication, in particular to a method for real-time detection and suppression of power line pulse noise. Background technique [0002] Power line carrier communication refers to a communication method that uses power lines to transmit data and media signals. Because of its low construction cost and wide coverage, it has been widely used in smart home, electricity information collection, electrical equipment monitoring and other fields. . However, the power line was originally designed for the transmission of electric energy, and the channel characteristics are far from ideal. In order to achieve reliable and high-speed data transmission on the power line, the current mainstream power line carrier communication protocol adopts OFDM technology, combined with longer cyclic prefix, stronger channel interleaving, diversity copy and channel coding technologies to achieve Resist signal damage and d...

AI Technical Summary

Problems solved by technology

Although time-domain processing is easy to achieve real-time detection and suppression of pulse noise, the current time-domain processing method basically samples the received signal in the time domain, calculates the number of pulses and the average power or mean value of the sampled data, and calculates the Number and average power or mean value combined with received signal power to perform pulse detection and elimination on the current sampled data. This method must store a certain amount of sampled data, and the circuit area is large, and there is a large processing delay; in addition, power communication is A fast burst transmission, when there is a signal or no signal or during the automatic gain control (AGC) adjustment process, the average power or average value will change significantly, which is easy to cause misjudgment; in addition, the OFDM power line communication system has a higher peak-to-average Ratio, this also brings a greater challenge to the detection effect of impulse noise

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