發(fā)布時間：2018-06-16 16:47

  本文選題：水下無線可見光通信 + OFDM��； 參考：《浙江大學(xué)》2017年碩士論文

【摘要】：隨著社會的不斷發(fā)展,陸地上的資源已經(jīng)難以滿足人類日益增長的物質(zhì)需求,越來越多的國家將目光聚焦于海洋。海洋不僅蘊含著豐富的水產(chǎn)資源,而且蘊藏著難以估計的能源等其它資源,這使得各國掠奪海洋資源的競爭愈演愈烈�？茖W(xué)技術(shù)在這場競爭中發(fā)揮著重要的作用,為了能夠?qū)崟r監(jiān)測海洋和智能開發(fā)海洋,越來越多的國家在海底布放了觀測網(wǎng)絡(luò)。在海底觀測網(wǎng)絡(luò)中,大量數(shù)據(jù)需要進(jìn)行傳輸與存儲,與水聲、無線電通信相比較,水下無線可見光通信憑借著高速數(shù)據(jù)傳輸?shù)膬?yōu)點而獨樹一幟。本文分析了當(dāng)前水下通信技術(shù)的現(xiàn)狀,詳細(xì)介紹了正交頻分復(fù)用(OFDM)關(guān)鍵技術(shù)的原理。首先,利用Matlab軟件編寫發(fā)射端信號產(chǎn)生和接收端信號解調(diào)的代碼,并借助任意波形發(fā)生器和混合信號示波器驗證了水下OFDM無線可見光通信系統(tǒng)的可行性。隨后,使用Quartus Ⅱ 11.0來編寫整個通信系統(tǒng)代碼并實現(xiàn)基于FPGA的水下無線可見光通信系統(tǒng)。主要模塊包括系統(tǒng)工作時鐘模塊、發(fā)射端控制信號模塊、長短訓(xùn)練符號生成模塊、并串轉(zhuǎn)換模塊、正交幅度調(diào)制(QAM)模塊、快速傅里葉反變換模塊、加窗與循環(huán)前綴模塊、分組檢測模塊、符號同步模塊、快速傅里葉變換模塊、信道估計與均衡模塊、QAM解調(diào)模塊以及四位轉(zhuǎn)八位轉(zhuǎn)換模塊。采用ModelSim-Altera來仿真整個通信系統(tǒng),搭建了一套基于FPGA的水下OFDM無線可見光通信測試平臺,并將實驗結(jié)果與仿真結(jié)果相對比,驗證了該系統(tǒng)能夠?qū)崿F(xiàn)通信功能。在9.375×10-3g/L的Mg(OH)2溶液中通信時,整個通信系統(tǒng)的傳輸速率能夠達(dá)到80Mbps,誤碼率為2.24×10-3,傳輸距離為2米。
[Abstract]:With the development of society, the resources on land have been unable to meet the increasing material needs of human beings. More and more countries are focusing on the ocean. The ocean not only contains rich aquatic resources but also contains inestimable energy and other resources. Science and technology play an important role in this competition. In order to monitor the ocean in real time and develop the ocean intelligently, more and more countries have placed observation networks on the seabed. In the submarine observation network, a large number of data need to be transmitted and stored. Compared with underwater acoustic and radio communication, underwater wireless visible light communication is unique by virtue of the advantages of high-speed data transmission. In this paper, the present situation of underwater communication technology is analyzed, and the principle of OFDM (orthogonal Frequency Division Multiplexing) is introduced in detail. Firstly, the codes of signal generation and signal demodulation at the transmitter and receiver are compiled by Matlab software, and the feasibility of underwater OFDM wireless visible light communication system is verified by using arbitrary waveform generator and mixed signal oscilloscope. Then, Quartus 鈪，

本文編號：2027418