【摘要】：近年來隨著骨干網(wǎng)的建成以及最后一公里問題的出現(xiàn),自由空間光通信技術以其較高的通信速率與安全性能等優(yōu)點引起了人們的重視。隨著大功率半導體激光器技術的成熟以及量子級聯(lián)激光器的進步,解決了中紅外激光光源的問題,中紅外無線光通信以其更低的大氣信道影響,更小的通信損耗,以及更遠的通信距離和更高的通信穩(wěn)定性,在一定程度上突破了近紅外無線光通信技術在大氣信道中的局限性,成為有望取代近紅外無線光通信的一種十分有前途的無線光通信方式。本文對基于PPM調(diào)制的中紅外無線光通信系統(tǒng)進行了研究。首先,對無線光通信的大氣信道中各種影響因子進行了理論分析,在此基礎上利用Matlab搭建無線光通信系統(tǒng)模型,分析了基于PPM調(diào)制的中紅外無線光通信系統(tǒng)相對于近紅外無線光通信系統(tǒng)在不同的大氣信道影響因子下具有更高的通信可靠性,對中紅外與近紅外在通信性能上進行對比分析。此外,基于所選器件的特性,對高斯模型下的光束對準情況進行了建模與仿真分析,進而對中紅外無線光通信的通信性能做進一步的分析。接著,根據(jù)中紅外光源與光電探測器的性能,設計了基于FPGA的中紅外無線光通信系統(tǒng)的發(fā)射端與接收端電路,并對電路進行調(diào)試。發(fā)射端利用FPGA控制中紅外無線光源發(fā)射信號,接收端通過放大、濾波以及比較電路,將接收到的信號經(jīng)處理后傳送給FPGA進行進一步分析。同時,根據(jù)中紅外光源對于信號的要求進行了基于FPGA的PPM調(diào)制與解調(diào)程序的設計,搭建通信系統(tǒng),對整個通信系統(tǒng)進行調(diào)試與實驗,實現(xiàn)了基于PPM調(diào)制的以中紅外激光作為載波的無線光通信。
[Abstract]:In recent years, with the construction of backbone network and the emergence of the last kilometer problem, free space optical communication technology has attracted people's attention because of its high communication rate and security performance. With the development of high power semiconductor laser technology and quantum cascade laser, the problem of medium infrared laser source has been solved. The medium infrared wireless optical communication has lower atmospheric channel influence and smaller communication loss. As well as longer communication distance and higher communication stability, it breaks through the limitation of near infrared wireless optical communication technology in atmospheric channel to some extent. It is expected to replace near infrared wireless optical communication as a promising wireless optical communication mode. In this paper, the medium-infrared wireless optical communication system based on PPM modulation is studied. Firstly, the influence factors of wireless optical communication in atmospheric channel are analyzed theoretically, and then the model of wireless optical communication system is built by using Matlab. Compared with the near infrared wireless optical communication system, the medium infrared wireless optical communication system based on PPM modulation has higher communication reliability than that of the near infrared wireless optical communication system under different influence factors of atmospheric channel. The communication performance of the middle infrared and near infrared communication systems is compared and analyzed. In addition, based on the characteristics of the selected devices, the beam alignment under Gao Si model is modeled and simulated, and the communication performance of mid-infrared wireless optical communication is further analyzed. Then, according to the performance of the mid-infrared light source and photodetector, the transmitter and receiver circuits of the mid-infrared wireless optical communication system based on FPGA are designed, and the circuits are debugged. The transmitter transmits the signal by using the mid-infrared wireless light source controlled by FPGA, and the receiver transmits the received signal to the FPGA for further analysis by amplifying, filtering and comparing circuit. At the same time, according to the signal requirement of the mid-infrared light source, the program of PPM modulation and demodulation based on FPGA is designed, the communication system is built, and the whole communication system is debugged and tested. The wireless optical communication based on PPM modulation is realized, in which the medium infrared laser is used as carrier.
【學位授予單位】：哈爾濱工程大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.1

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本文編號：2199768