LED語音收發(fā)機的設計與優(yōu)化

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摘 要
可見光通信是基于LED的新興無線光通信技術。它具有發(fā)射功率高、壽命長、不占用無線電頻譜、無電磁干擾和節(jié)約能源等優(yōu)點，能夠實現(xiàn)照明和通信的雙重功能。白光LED又具有響應時間短和調制速率高的特性，因此可以設計出基于白光LED的室內可見光通信收發(fā)系統(tǒng)。本次畢業(yè)設計主要針對典型室內通信系統(tǒng)模型，運用網格循環(huán)算法，仿真該模型的信道沖激響應，并分析了在不同的信號調制編碼方法下的接收性能，得出本系統(tǒng)具有一定可行性的結論。在上述理論分析的基礎上，畢業(yè)設計還參與了LED語音通信收發(fā)機的軟硬件設計與優(yōu)化工作。
本論文主要目的是根據(jù)LED可見光室內無線通信的收發(fā)理論基礎，對LED語音通信系統(tǒng)收發(fā)機進行開發(fā)設計與性能優(yōu)化。論文第一章，論述了研究背景、研究意義、研究現(xiàn)狀及設計的主要內容及方法；第二章主要對語音收發(fā)機所需的各項數(shù)據(jù)進行仿真分析，包含室內LED的布局、信道模型的確立和傳輸速率及調制方式等方面；第三章，對LED語音通信系統(tǒng)的硬件的設計，給出實驗方案以及使用Protel如何搭建電路圖；第四章，使用Keil軟件對收發(fā)機的嵌入式程序進行分析與解釋；第五章，對本系統(tǒng)的后續(xù)工作進行總結和展望。

關鍵詞：可見光通信，仿真，硬件設計，軟件開發(fā)。


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

目錄
第一章 前 言 1
1.1 課題研究的背景及意義 1
1.2 課題研究的現(xiàn)狀 1
1.3 課題研究的主要內容及方法 2
第二章 LED語音收發(fā)機的仿真模型 3
2.1 室內LED可見光通信的典型應用 3
2.2 室內光通信系統(tǒng)的布局設計 4
2.3 室內LED可見光通信系統(tǒng)的關鍵技術 6
2.4 信號模型原理 7
2.5 均方根時延和可見光直流增益 8
2.6 用網格循環(huán)算法技術信道沖激響應 12
2.7 典型室內無線信道模型確立和應用 13
2.8 直射光與一次反射光的接收功率 14
2.9 不同信號傳輸速率的光信號接收質量 16
2.10 OOK信號仿真分析和性能評價 18
2.11 2PPM信號仿真分析和性能評價 20
第三章 語音收發(fā)機硬件的設計 22
3.1 LED與PD光收發(fā)器件的設計思路 22
3.2 電路設的重點 22
3.3 LED驅動調制電路的設計要求與注意事項 23
3.4 實驗方案及電路搭建 23
第四章 語音收發(fā)機的嵌入式開發(fā)部分 29
4.1 發(fā)送和接收的軟件程序流程 29
4.2 發(fā)送端 29
4.3 接收端 32
第五章 總結與展望 35
致 謝 35
參考文獻 36