低压电力线载波高速通信技术的研究机械工程专业论文.docxVIP

哈尔滨工业大学工程硕士学位论文 哈尔滨工业大学工程硕士学位论文 - - II - Abstract The lower-voltage power line carrier communication refers to taking the lower-voltage power line distribution network as transmission medium,realizing the data transmission and the exchange of information as one means of communication.At present the intelligent building,the intelligent community have become the hot spot which the people studies,also will be the future development tendency. Taking the lower-voltage power line as the communication medium of the intelligent community,compared with other means of communication,does not need to lay down the line,and has the high reliability,few investment,quick efficiency and so on.Therefore it has the broad maket prospect. This thesis presents the minute research of some key High-speed PLC technologies on low-voltage (LV) distribution networks ． It mainly includes four aspects ： analysis of Network characteristic and channel characteristic on LV distribution networks ， research of modulating technique on LV distribution networks, compare and selection of MAC (Media Access Control) Protocols on LV distribution networks，research of the wide-band coupling technology on LV distribution networks. The paper analyzes the impedance,noise and attenuation characteristics of PLC channel and introduces the PLC channel model which will help us undeestand PLC further.On matlab platform design simulating experiments,got the comparing result and the good and bad characteristics of OFDM and DSSS modulation technique. In order to improve the practicability of the low-voltage power line communication(PLC) some high level communication protocols should be applied.The paper analyze the topological structure of low-voltage power line communication networks and their characteristics, this work brings some suggestions for MAC protocol in LV distribution of high-speed PLC system which fits for the situation of our country. Moreover, the characteristics and applications of all kinds of MAC