LED語(yǔ)音收發(fā)機(jī)的設(shè)計(jì)與優(yōu)化

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摘 要
可見(jiàn)光通信是基于LED的新興無(wú)線光通信技術(shù)。它具有發(fā)射功率高、壽命長(zhǎng)、不占用無(wú)線電頻譜、無(wú)電磁干擾和節(jié)約能源等優(yōu)點(diǎn)，能夠?qū)崿F(xiàn)照明和通信的雙重功能。白光LED又具有響應(yīng)時(shí)間短和調(diào)制速率高的特性，因此可以設(shè)計(jì)出基于白光LED的室內(nèi)可見(jiàn)光通信收發(fā)系統(tǒng)。本次畢業(yè)設(shè)計(jì)主要針對(duì)典型室內(nèi)通信系統(tǒng)模型，運(yùn)用網(wǎng)格循環(huán)算法，仿真該模型的信道沖激響應(yīng)，并分析了在不同的信號(hào)調(diào)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(jié)論。在上述理論分析的基礎(chǔ)上，畢業(yè)設(shè)計(jì)還參與了LED語(yǔ)音通信收發(fā)機(jī)的軟硬件設(shè)計(jì)與優(yōu)化工作。
本論文主要目的是根據(jù)LED可見(jiàn)光室內(nèi)無(wú)線通信的收發(fā)理論基礎(chǔ)，對(duì)LED語(yǔ)音通信系統(tǒng)收發(fā)機(jī)進(jìn)行開(kāi)發(fā)設(shè)計(jì)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(shè)計(jì)的主要內(nèi)容及方法；第二章主要對(duì)語(yǔ)音收發(fā)機(jī)所需的各項(xiàng)數(shù)據(jù)進(jìn)行仿真分析，包含室內(nèi)LED的布局、信道模型的確立和傳輸速率及調(diào)制方式等方面；第三章，對(duì)LED語(yǔ)音通信系統(tǒng)的硬件的設(shè)計(jì)，給出實(shí)驗(yàn)方案以及使用Protel如何搭建電路圖；第四章，使用Keil軟件對(duì)收發(fā)機(jī)的嵌入式程序進(jìn)行分析與解釋；第五章，對(duì)本系統(tǒng)的后續(xù)工作進(jìn)行總結(jié)和展望。

關(guān)鍵詞：可見(jiàn)光通信，仿真，硬件設(shè)計(jì)，軟件開(kāi)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(nèi)容及方法 2
第二章 LED語(yǔ)音收發(fā)機(jī)的仿真模型 3
2.1 室內(nèi)LED可見(jiàn)光通信的典型應(yīng)用 3
2.2 室內(nèi)光通信系統(tǒng)的布局設(shè)計(jì) 4
2.3 室內(nèi)LED可見(jiàn)光通信系統(tǒng)的關(guān)鍵技術(shù) 6
2.4 信號(hào)模型原理 7
2.5 均方根時(shí)延和可見(jiàn)光直流增益 8
2.6 用網(wǎng)格循環(huán)算法技術(shù)信道沖激響應(yīng) 12
2.7 典型室內(nèi)無(wú)線信道模型確立和應(yīng)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(hào)傳輸速率的光信號(hào)接收質(zhì)量 16
2.10 OOK信號(hào)仿真分析和性能評(píng)價(jià) 18
2.11 2PPM信號(hào)仿真分析和性能評(píng)價(jià) 20
第三章 語(yǔ)音收發(fā)機(jī)硬件的設(shè)計(jì) 22
3.1 LED與PD光收發(fā)器件的設(shè)計(jì)思路 22
3.2 電路設(shè)的重點(diǎn) 22
3.3 LED驅(qū)動(dòng)調(diào)制電路的設(shè)計(jì)要求與注意事項(xiàng) 23
3.4 實(shí)驗(yàn)方案及電路搭建 23
第四章 語(yǔ)音收發(fā)機(jī)的嵌入式開(kāi)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(jié)與展望 35
致 謝 35
參考文獻(xiàn) 36