基于System Generator的宽带电力线脉冲噪声实现方法

摘要

Random impulse noise is the key factor affecting the broadband power line carrier (BPLC) in the electric energy information acquisition system.And there is a lack of standardized modeling and implementation of broadband power line noise in current evaluation and testing techniques.The classic Middleton Class-A impulsive noise model is researched and the conditions for the binomial distribution to approximate Poisson distribution are analyzed.Based on the Bernoulli experimental model, the threshold of pseudo-random sequence generated by the full cycle linear congruence method is set up according to the pulse index in the Middleton Class-A, and a Poisson sequence of a specific intensity is obtained by determining this threshold.The noise variance of the specific state is obtained after being calculated in the weighting factor part, then multiplied by Gaussian white noise sequence.The System Generator modular design method of Class-A impulse noise can achieve fast algorithm verification.By comparing the statistical characteristics of field programmable gate array (FPGA) output and theoretical random impulse noise, the validity and accuracy of the method are proved.%随机脉冲噪声是影响用电信息采集系统中宽带电力线载波(BPLC)通信的关键因素.目前的评估测试技术中缺乏标准化的宽带电力线噪声建模和实现方法.研究了经典的Middleton Class-A脉冲噪声模型,分析了二项分布逼近泊松分布的条件,从伯努利实验模型出发,依据Middleton Class-A模型的脉冲指数设定满周期线性同余法生成伪随机序列的阈值,通过判定阈值以获取特定强度的泊松序列.该序列在加权因子部分进行数值运算,得到特定状态的噪声方差,利用乘法器与高斯白噪声序列相乘.所提Class-A脉冲噪声的System Generator模块化设计方法能够实现快速的算法验证,通过对比现场可编程门阵列(FPGA)输出与理论随机脉冲噪声的统计特性,证明了该实现方法的有效性与准确性.