Device and method for detecting narrowband interference in power line communication system

Abstract

Embodiments of the present invention provide a narrowband interference detection device and detection method for a power line communication system, a processor, and a computer-readable storage medium, which belong to the field of carrier communication. The device includes: a timing synchronization module, which is used to select different working modes according to the narrowband interference intensity of the channel to set corresponding synchronization parameters for synchronization calculation; a channel estimation module, located behind the timing synchronization module, for receiving the channel data through synchronization calculation and performing Channel estimation and calculation of narrowband threshold parameters; narrowband detection module, located behind the channel estimation module, used to determine the narrowband threshold according to the narrowband threshold parameters, and determine the filtering parameters according to the narrowband threshold; narrowband rejection filter, connected with the narrowband detection module, located in the timing Before the synchronization module, it is used to calculate the narrowband bandstop filter coefficients according to the filtering parameters and perform narrowband filtering.

Description

technical field [0001] The invention relates to the field of carrier communication, in particular to a narrowband interference detection device and detection method, a processor, and a computer-readable storage medium for a power line communication system. Background technique [0002] Broadband power line communication is an OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) communication system. Spectrum leakage caused by time-frequency conversion during receiver demodulation will affect data on adjacent subcarriers. As the strength of the narrowband interference signal increases, the bit error rate of the communication system will increase significantly, and the system cannot communicate when the interference is severe. [0003] The current narrow-band interference suppression technology usually uses time-domain windowing method, frequency-domain sorting and zeroing method and threshold filtering method. Time-domain windowing ma...

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Problems solved by technology

The preset amplitude threshold value method cannot flexibly calculate the threshold according to the channel environment. In addition, in the actual test and simulation analysis, using the amplitude value to judge narrowband interference has poor reliability

For the power threshold method, one of the methods is to multiply the threshold by the average power of subcarriers. In this method, if any subcarrier is an empty subcarrier, the calculated average power is low and the reliability of the threshold is low; the other method The threshold value is calculated in real time according to the mean and variance of subcarrier power, but this method uses single frame data to calculate the narrowband interference threshold value, and the reliability of the obtained threshold value depends on the channel environment of the current frame. When it is high, the success rate of narrowband judgment is low

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