摘要随着电力线通信技术的迅速发展，电力线通信在各领域的应用越来越广泛， 电力线通信已逐渐成为一种重要的通信方式。然而，电力线本身并非设计用来通 信的，使用电力线进行通信存在噪声大、通信不稳定等特点。因此，有必要对电 力线中的噪声和信道构建合适的模型进行研究。68439

（1）分析了电力线通信系统中的噪声特性以及电力线信道的特性；（2）基于 MATLAB 构建了电力线通信中背景噪声的自回归模型，根据 Burg 算法设计出快速 求解背景噪声模型参数的程序并进行仿真；（3）针对电力线通信信道的多径效应 和衰减效应构建了与电力线通信信道的多径模型。对以上模型进行了仿真，仿真 结果表明所建模型精度较高，可有效地反映背景噪声和电力线通信信道的特性。

毕业论文关键词 电力线通信 背景噪声 自回归模型 Burg 算法 衰减效应

Title Modeling and Simulation of Communication Channel   and Background Noise in the PLC System

Abstract

With the rapid development of power line communication, power line communication has been more and more widely applied in various fields and it has become an important way of communication. However, the power line is not designed to communicate and thus much noise exists in it and it is not stable. Therefore, it is necessary to power line noise and channel build an appropriate model to study.

(1)Analyzing the characteristics of the power line channel and the noises in it; (2) Establishing the autoregressive model of background noise based on MATLAB. The Burg algorithm has been used to find the parameters of the background noise and the program has been written to simulate;(3)Multipath effect and attenuation effect has been used when building models of power line communication and the program which contains an eleven-path model has been written to make simulations. The results of the simulations of the power line channels and the background noise in it show the accuracy of the models, so the models can effectively describe the characteristics of the power line net.

Keywords Power Line Communication Background Noise Autoregressive Model  Burg Algorithm   Attenuation Effect

目 次

1 绪论 1

1.1 背景及意义 1

1.2 电力线通信技术及其特点 2

1.3 电力线通信技术的发展现状 3

1.4 课题研究的主要内容 4

2 电力线通信中噪声及信道分析 6

2.1 电力线通信中噪声特性 6

2.2 背景噪声模型的分析 7

2.3 电力线通信信道模型分析 9

2.4 仿真平台的选择 11

2.5 本章小结 11

3 建模的方案 12

3.1 基于 AR 模型的背景噪声建模 12

3.2 基于多径模型的电力线信道建模 17

3.3 本章小结 19

4 仿真及结果分析 20

4.1 背景噪声模型仿真与结果分析 20

4.2 电力线通信信道噪声多径模型的仿真与结果分析 22

4.3 本章小结