毕业设计――电力载波通信原理与实现

武汉科技大学本科毕业设计本科毕业设计题目：电力载波通信原理与实现学院:信息科学与工程学院专业:自动化学号:200704134126学生姓名:郑雷指导教师:王耀青日期:二○一一年六月武汉科技大学本科毕业设计I摘要低压电力线载波通信技术是利用现有的电力线作为信号传输信道来实现一对一、一对多或多对多的通信技术。在本设计中主要实现主从通信，为交通信号灯系统进行相关数据的传送。本设计采用青岛东软的电力线载波扩频通信芯片PLCI36-III-E来设计电力线载波模块。在本设计中，采用的调制方式是二进制频移键控（BFSK）方式，并将调制后的信号进行直接序列扩频以增强其抗干扰性。本设计还对其他的数字调制方式进行了简单的介绍，通过比较分析选择BFSK和直序扩频方式实现信息的调制。本设计是基于PLCI36-III-E的电力线载波模块，其硬件部分包括载波耦合电路、信号发送电路（信号功率放大电路和输出功率控制电路）、滤波接收单元（接收滤波电路和解调电路）等。在完成本设计硬件部分的理论分析后，进行相关的测试，并对测试结果做进一步的分析。关键字：低压电力线载波通信；二进制频移键控；直接序列扩频；电力线载波模块硬件电路武汉科技大学本科毕业设计IIAbstractLow-voltagepowerlinecarriercommunicationtechnologyistheuseoftheexistingpowerlineasasignaltransmissionchanneltoachieveonetoone,manyormanytomanycommunicationtechnologies.Achievedinthedesignofthemainmaster-slavecommunication,thetrafficsignalsystemdatatransmission.ThisdesignusesPowerLineCarrierQingdaoNeusoftspreadspectrumcommunicationchipPLCI36-III-Etodesignthepowerlinecarriermodule.Inthisdesign,theuseofthemodulationisbinaryfrequencyshiftkeying(BFSK)method,andmodulateddirectsequencespreadspectrumsignaltoenhanceitsanti-interference.Thedesignalsoforotherdigitalmodulationmethodswerebrief,comparativeanalysisofselectionmethodsBFSKanddirectsequencespreadspectrummodulationtoachieveinformation.ThedesignisbasedonthePLCI36-III-Eofthepowerlinecarriermodule,thehardwareincludingthecarriercouplingcircuit,thesignaltransmissioncircuit(signalpoweramplifierandoutputpowercontrolcircuit),thefilterreceivingunit(receivingfiltercircuitanddemodulationcircuit)andsoon.Uponcompletionofthedesignofthehardwarepartofthetheoryanalysis,therelevanttests,andtestresultsforfurtheranalysis.Keywords:Lowvoltagepowerlinecarriercommunication;Binaryfrequencyshiftkeying;Directsequencespreadspectrum;Powerlinecarriermodulehardware武汉科技大学本科毕业设计III目录1绪论.................................................................................................................................11.1电力线载波通信的发展.............................................................................................11.1.1电力线载波通信的现状......................................................................................11.1.2电力线载波通信的发展历史..............................................................................21.2低压电力线载波通信技术.........................................................................................21.3本文概述....................................................................................................................32电力线载波通信原理......................................................................................................52.1电力线载波通信调制技术概述..................................................................................52.2数字频率调制.............................................................................................................62.2.1二进制频移键控（BFSK）................................................................................62.2.2最小频移键控（MSK）...................................................................................102.2.3高斯滤波的最小频移键控（GMSK）.............................................................122.3正交分频复用技术（OFDM）................................................................................132.3.1多载波系统.......................................................................................................132.3.2正交分频复用技术的基本原理.........................................................................142.3.3正交分频复用技术的优点................................................................................152.4直接序列扩频方式...................................................................................................152.4.1直接序列扩频方式的基本原理.........................................................................152.4.2扩频通信的理论依据与优点............................................................................162.5本章总结..................................................................................................................163电力线载波通信模块的硬件实现.................................................................................173.1电力线载波通信系统组成.......................................................................................173.1.1载波耦合电路...................................................................................................173.1.2信号功率放大电路............................................................................................183.1.3输出功率控制电路............................................................................................193.1.4接收滤波电路...................................................................................................20武汉科技大学本科毕业设计IV3.2解调电路..................................................................................................................213.2.1185kHz信号输出电路......................................................................................223.2.2低功耗窄带模拟前端AFE3361........................................................................233.3电力线载波扩频通信芯片PLCI36-III-E.................................................................243.3.1电力线载波扩频通信芯片PLCI36-III-E简介..................................................2