led语音收发机的设计与优化.doc

LED语音收发机的设计与优化

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自己原创的毕业论文，已经通过校内系统检测，重复率低，仅在本站独家出售，大家放心下载使用

摘 要
可见光通信是基于LED的新兴无线光通信技术。它具有发射功率高、寿命长、不占用无线电频谱、无电磁干扰和节约能源等优点，能够实现照明和通信的双重功能。白光LED又具有响应时间短和调制速率高的特性，因此可以设计出基于白光LED的室内可见光通信收发系统。本次毕业设计主要针对典型室内通信系统模型，运用网格循环算法，仿真该模型的信道冲激响应，并分析了在不同的信号调制编码方法下的接收性能，得出本系统具有一定可行性的结论。在上述理论分析的基础上，毕业设计还参与了LED语音通信收发机的软硬件设计与优化工作。
本论文主要目的是根据LED可见光室内无线通信的收发理论基础，对LED语音通信系统收发机进行开发设计与性能优化。论文第一章，论述了研究背景、研究意义、研究现状及设计的主要内容及方法；第二章主要对语音收发机所需的各项数据进行仿真分析，包含室内LED的布局、信道模型的确立和传输速率及调制方式等方面；第三章，对LED语音通信系统的硬件的设计，给出实验方案以及使用Protel如何搭建电路图；第四章，使用Keil软件对收发机的嵌入式程序进行分析与解释；第五章，对本系统的后续工作进行总结和展望。

关键词：可见光通信，仿真，硬件设计，软件开发。


Abstract
Visible light communication is a new kind of wireless optical communication that based on LED technology.It has high transmission power, long life, no take up radio spectrum, no electromagnetic interference and the advantages of energy saving to realize the double function of illumination and communications.White LED has the characteristics of short response time and high modulation rate, it can design out the indoor visible light communication transceiver system based on white LED.This graduation design is aimed at a typical indoor communication system model, using the grid algorithm, simulation of channel impulse response of the model, and analyzed under different signal modulation coding method of receiving performance, come to the conclusion that this system has certain feasibility.On the basis of the above theoretical analysis, the graduation design also has participated in the LED voice communication transceiver hardware and software design and optimization work.
Purpose of this paper is based on the LED indoor visible light wireless communication transceiver theoretical basis, to develop LED voice communication system transceiver design and performance optimization.The first chapter, this paper discusses the research background, research significance, research status and the main content of the design and method;The second chapter mainly discusses the phonetic transceiver simulation analysis of the data needed, including the layout of the indoor LED,the establishment of the channel model and transmission rate and modulation mode;The third chapter, the LED voice communication system, the design of the hardware, experiment scheme and how to use Protel structures, circuit diagram is given;The fourth chapter, using Keil software for analysis and interpretation of the transceiver embedded programs.The fifth chapter, the follow-up work of this system is summarized and prospected.
Key words : visible light communication, simulation, hardware design, software development

目录
第一章 前 言 1
1.1 课题研究的背景及意义 1
1.2 课题研究的现状 1
1.3 课题研究的主要内容及方法 2
第二章 LED语音收发机的仿真模型 3
2.1 室内LED可见光通信的典型应用 3
2.2 室内光通信系统的布局设计 4
2.3 室内LED可见光通信系统的关键技术 6
2.4 信号模型原理 7
2.5 均方根时延和可见光直流增益 8
2.6 用网格循环算法技术信道冲激响应 12
2.7 典型室内无线信道模型确立和应用 13
2.8 直射光与一次反射光的接收功率 14
2.9 不同信号传输速率的光信号接收质量 16
2.10 OOK信号仿真分析和性能评价 18
2.11 2PPM信号仿真分析和性能评价 20
第三章 语音收发机硬件的设计 22
3.1 LED与PD光收发器件的设计思路 22
3.2 电路设的重点 22
3.3 LED驱动调制电路的设计要求与注意事项 23
3.4 实验方案及电路搭建 23
第四章 语音收发机的嵌入式开发部分 29
4.1 发送和接收的软件程序流程 29
4.2 发送端 29
4.3 接收端 32
第五章 总结与展望 35
致 谢 35
参考文献 36