电力载波通信中接收端通路噪声规避系统设计

刘彦甲+晋会杰

摘 要： 以电力载波通信中接收端通路噪声为研究对象，提出基于分数阶傅里叶变换限波的噪声干扰规避设计。根据噪声具有的频谱特性构建噪声时间序列信号测量模型，由于不同噪声信号具有不同的时间序列，计算噪声信号的功率谱并获取功率谱值，通过运用噪声时间序列信号测量模型对噪声信号实现判定；依据噪声信号在分数阶傅里叶域的特征，将信号变化至傅里叶域，在该域中实现一维遮盖处理，滤除非平稳宽带干扰信号，再重新变换至时域中；在傅里叶域中构造滤波器，利用门限值对接收端信号进行调节，实现噪声信号规避设计。实验证明，利用所提方法可有效避免载波通信接收端的噪声信号影响。

关键词： 电力； 载波通信； 分数阶傅里叶； 噪声信号

中图分类号： TN911.4?34； TP391 文献标识码： A 文章编号： 1004?373X（2017）17?0167?04

Design of access noise circumvention system for receiving terminal

in power line carrier communication

LIU Yanjia， JIN Huijie

（School of Information and Electronic Engineering， Shangqiu Institute of Technology， Shangqiu 476000， China）

Abstract： Taking access noise of receiving terminal in power line carrier communication as a research object， a noise interference circumvention design based on fractional Fourier transform waveform limitation is proposed. According to spectral characteristic of noise， a noise signal measurement model based on time series was constructed. Since different noise signals have various time series， the power spectrum of noise signal is calculated to acquire the power spectrum. The noise signal is judged by means of noise signal measurement model based on time series. On the basis of the characteristic of noise signal in fractional Fourier domain， the signal is transformed into Fourier domain， in which the signal is processed with one?dimensional to filter out the interference signal of non?stationary wideband and retransformed into time domain. The filter was constructed in Fourier domain. The receiving terminal signal is adjusted with the threshold value to realize the design of noise signal circumvention. The experimental results show that the method can avoid the influence of the carrier communication receiving terminal on noise signal effectively.

Keywords： electric power； carrier communication； fractional Fourier； noise signal

0 引 言

目前通信技术发展迅猛，给人们生活带来了巨大改变，在解决“最后一公里”的方案中电力线载波通信技术意义重大，它正逐渐融入到人们的生活中[1]。在信息家电、楼宇智能及Internet接入等领域中电力线载波通信都得到了广泛应用，拥有非常高的关注度[2?3]。

文献[4]提出整个通信系统研究中电力线载波通信噪声特性是必不可少的一部分，针对它的研究与仿真意义重大。对于实际通信过程而言，对信道噪声特性进行研究能够让通信系统明确如何规避通信过程中的噪声影响。噪声特性研究能够使硬件或编码等领域的开发应对措施具有更优的针对性和可行性，使通信质量提升；……