Precise narrow-band noise resisting method used in power line carrier communication Rx process
A power line carrier and narrow-band noise technology, which is applied in distribution line transmission systems, electrical components, wired transmission systems, etc., can solve problems such as notch waves and ineffectiveness, and achieve simple implementation, improved communication performance, and high execution efficiency Effect
Pending Publication Date: 2021-04-06
江苏芯云电子科技有限公司
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Problems solved by technology
In the current HPLC communication technology, the means of anti-narrowband noise is generally: on the receiving side, dynamically detect the narrowband noise of the frequency corresponding to the integer frequency point and judge and trap it. This method can quickly and effectively trap the narrowband noise. wave, but only supports the calculation of integer frequency points, and cannot effectively notch the narrowband noise on non-integer frequency points
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[0034] Conventional anti-narrowband noise calculations only support integer frequency points with an accuracy of 0.024414MHz, while the precise anti-narrowband noise method used in the Rx process of power line carrier communication provided by the present invention is suitable for accurate narrowband estimation in the field and can improve accuracy Ten times to 0.0024414MHz.
[0035] Specific methods such as figure 1 Shown: On the receiving side of the HPLC module, the FFT energy calculation of 1024 points is performed on the received signal, and the energy proportional relationship between the maximum energy integer frequency point and the adjacent second largest energy integer frequency point is calculated. According to the adjacent second largest energy and the largest energy The interval of the energy ratio and the size relationship between the two integer frequency points further determine the precise frequency of the narrowband noise.
[0036] Assuming that the frequenc...
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The invention discloses a precise narrow-band noise resisting method used in a power line carrier communication Rx process, which is characterized by comprising the following steps of: on the receiving side of an HPLC module, carrying out 1024-point FFT energy calculation on a received narrow-band signal, and calculating an energy proportional relation between a maximum energy integer frequency point and an adjacent secondary maximum energy integer frequency point; and determining the accurate frequency of the narrow-band noise according to the interval to which the ratio of the adjacent secondary maximum energy to the maximum energy belongs and the size relationship between the two integer frequency points, thereby realizing the accurate notch of the narrow-band noise. According to the method, the frequency of the narrow-band noise can be accurately calculated and trapped, and the precision is improved to 0.0024414 MHz. The method disclosed by the invention is simple to implement and high in execution efficiency, meets the actual application of HPLC to narrow-band noise resistance, and can effectively improve the communication performance.
Description
technical field [0001] The invention relates to the technical field of power line carrier communication, in particular to an anti-narrowband noise method. Background technique [0002] Power Line Communication (PLC) is a communication method that uses power lines as a communication medium for data transmission. This technology couples the communication signal carrying the information to the power line through the coupling circuit to realize the data transmission of the power line network. With the continuous advancement of this technology, data, voice, video and other multi-service transmission can be realized on the power line. Therefore, PLC has been widely used in remote meter reading, smart home and Internet access and other fields. [0003] The power line was originally used to transmit electric energy, and the channel characteristics of the power line are not ideal, mainly due to the input impedance characteristics, channel attenuation characteristics, time-varying tr...
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IPC IPC(8): H04B3/54H04B3/46
CPCH04B3/544H04B3/46
Inventor 吴宇婧汤颢邹其军刘海亮曹月明
Owner 江苏芯云电子科技有限公司