A low-voltage power line communication channel impulse noise detection method based on an amplitude and a width
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A low-voltage power line, impulse noise technology, applied in the field of communication noise detection, to achieve the effect of improving the recognition accuracy
Inactive Publication Date: 2014-03-19
KUNMING UNIV OF SCI & TECH
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[0004] The invention provides a low-voltage power line communication channel pulse noise detection method based on amplitude and width, which is used to solve the problem of detecting pulse noise in low-voltage power line communication (PLC) channels
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Embodiment 1
[0027] Embodiment 1: as Figure 1-4 As shown, a low-voltage power line communication channel pulse noise detection method based on amplitude and width, the specific steps of the method are as follows:
[0028] Step S1, sampling the power line communication channel noise to obtain N sampling points d i , i =0,1,2,3,... N -1;
[0029] Step S2, calculate N The absolute value mean of samples of noisy data: , i =0,1,2,3,... N -1;
[0030] Step S3, preset the maximum pulse amplitude threshold value V max ;
[0031] Step S4, calculate the difference between the highest threshold value and the absolute value mean value △ V : ;
[0032] Step S5, the difference △ V evenly divided M part;
[0033] Step S6, compare the sampling noise data d i with the first j Segment Minimum Pulse Amplitude Threshold : if there is noise data greater than the minimum pulse amplitude threshold in the sampled data, then go to step S7, otherwise go to S8;
[0034] in, , j =0,2,3,....
Embodiment 2
[0044] Embodiment 2: as Figure 1-4 As shown, a low-voltage power line communication channel pulse noise detection method based on amplitude and width, the specific steps of the method are as follows:
[0045] Step S1, sampling the power line communication channel noise to obtain N sampling points d i , i =0,1,2,3,... N -1;
[0046] More preferably, in the step S1, the sampling frequency at which the low-voltage power line communication channel noise is sampled f s is large enough to meet the requirements of Nyquist sampling theorem during the sampling process;
[0047] Step S2, calculate N The absolute value mean of samples of noisy data: , i =0,1,2,3,... N -1;
[0048] Step S3, preset the maximum pulse amplitude threshold value V max ;
[0049] In the step S3, select V max value, so that V max Greater than the mean value of the absolute value, less than the maximum value of the absolute value of the noise data, you can use V max won't let△ V It is a ne...
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Abstract
The invention relates to a low-voltage power line communication channel impulse noise detection method based on an amplitude and a width, and belongs to the technical field of noise detection. The invention low-voltage power line communication channel impulse noise detection method based on the amplitude and the width comprises the following steps: S1, sampling is carried out on power line communication channel noises; S2, an absolute value mean value of the sampled noises is calculated; S3, a pulse highest amplitude threshold value is preset; S4, a difference value between the absolute value mean value and the highest threshold value is calculated; S5, the difference value is segmented uniformly; S6, the sampled noises are compared with the a segment of pulse amplitude lowest threshold value; if noise data which is greater than the amplitude lowest threshold exists in the sampled data, the present step is turned to a step S7; and otherwise, the present step is turned to a step S8; S7, whether a continuous time of the noise data of one segment of pulse amplitude lowest threshold value is greater than the segment of preset impulse continuous time threshold value; and S8, whether the comparison of all the segments is finished is determined. According to the invention, the impulse noises can be detected and identified, and the identification accuracy of the impulse noises is raised.
Description
technical field [0001] The invention relates to a low-voltage power line communication channel pulse noise detection method based on amplitude and width, and belongs to the technical field of communication noise detection. Background technique [0002] With the advancement of technology, PLC technology is used to transmit high-speed data, images, voice and other media business signals with low-voltage power distribution lines, and is applied to home Internet (Internet) "broadband" access and intelligent networking control of home appliances, namely High speed data PLC. How to further improve the performance of low-voltage power line communication and realize high-speed and reliable long-distance communication depends on the grasp of the communication channel. The power line network is not specially designed for high-frequency signal transmission, so the power line network presents more and stronger factors that are not conducive to high-frequency signal transmission. Among...
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