电力线

First of all, this thesis analyzes in great details the characteristics of the power line channel.

论文首先对电力线信道特性进行了深入分析。

In recent years, with the development of communication technology, power line carrier communication has entered the digital age.

近年来，随着通信技术的发展，电力线载波通信已经进入了数字化时代。

The advantages and disadvantages of power line communication are described briefly, and the modulation technologies are summarized.

在介绍电力线信道特点的基础上，对现行载波通信的调制技术进行了总结。

Its study has practical mean to power distribution network' s reconstruction and reform and improvement of automation in power system.

本文提出的基于OFDM调制和电力线通信技术的配电自动化通信系统，对中、小城市和城镇的配电自动化系统的实施具有很好的参考价值。

This paper mainly deal with the sink of the spread spectrum communication on power line.

本文主要负责电力线扩频通信系统的接收部分。

Considering the performance requirements and the complexity of construction, realizability, cost requirement, etc, we finally decide to implement system by transmitting data over low voltage power line network.

综合考虑系统的性能要求及实际系统的施工复杂程度、可实现性、成本要求等，最终决定采用基于低压电力线网络进行数据传输的方式实现。

The main objective of this dissertation is to reinvestigate the benefits and situation of competition in the context of new developments and innovations in telecommunications industry.

光缆和电力线技术也已腐蚀了当地网络的垄断性。

In order to made realiable communication in low voltage power line for its scurviness of channel characteristic, the communication circuit in our paper adopts the technology of double-frquency spread spectrum based on DSP emused fast CPU.

为了在信道特性十分恶劣的低压电力线上实现可靠通信，本文采用双路扩频技术通过快速CPU用软件进行数字信号处理来实现调制解调。

The research status of power line communication technology, lighting technology and routing algorithm are summarized. The frame of this thesis is presented.

第二章分析了电力线载波通信信道的噪声、阻抗和衰减特性，得出这些特性均具有时变性和随机性的结论。

First is the digital majority of power line carrier terminal suspend telecommunication, a kind of can adjust the digital power line carrier terminal of speed voluntarily insurable hold telecommunication.

首先的是数字电力线载波机大多数中断通信，而一种可以自动调整速率的数字载波机却可保持通信。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。