基于光散射通信的无线组网技术研究

【作者】 黎立军；

【导师】 陈长缨；

【作者基本信息】 广东工业大学 ， 电力电子与电力传动， 2002， 硕士

【摘要】 本论文提出了基于光散射通信的无线组网新方法，给出了该通信系统的结构和功能模型，就系统涉及到的软件协议和通信理论进行了细致的分析。对整个系统实现过程中用到的关键技术进行了深入的探讨和研究。 论文探讨研究了目前国际上主要的局域网通信协议，并以此为基础提出了光散射无线组网方案。该方案克服了电磁波频率资源的约束，能高速传递大容量信息，且相对成本低、安全性高，适合宽带传输的要求。 论文涉及了计算机网络通信和光通信两个不同的技术领域，较全面地分析研究了基于光散射通信技术组网所涉及到的多方面、多学科的理论与技术。主要包括：Maxwell电磁理论；发送光场模型；空间信道模型；计算机网络通信技术：无线局域网通信技术；媒体访问控制规程(MAC)；载波检测多址接入／碰撞检测规程(CSMA／CD)；曼彻斯特编码与PPM编码技术等。论文研究中主要的创新性工作如下：1、提出利用光散射通信技术组建无线局域网，方便地实现了廉价而高速的局域网内微机的光互连；2、采用曼彻斯特编码技术解决了光无线通信中代码判决和碰撞检测的技术难题；3、针对空气信道的特点，利用PPM编码技术降低信道误码率、改善系统性能；4、在光无线局域网中利用现有的成熟有线局域网协议和技术，从而保证了系统的实用性及改善了系统的性价比。 基于光散射通信的无线组网技术具有较好的实用性和市场价值，是现有无线组网技术的补充和发展。更多还原

【Abstract】 In the paper, a conception of wireless LAN based on the technology of optical diffusion communication is presented. By analyzing the system’s structure and each part of the function components, the paper illustrates in detail all kinds of communication theories and protocols that are fundamental for the system’s operation. Especially, the paper makes a deep research on some crucial technologies by which a new kind of wireless LAN becomes hopeful, competitive and above all, practical.To fulfill the communication industry’s ultimate end (5W), it is necessary to transit the communication network from wire-connected to wireless-connected, immobility to mobility and single service function to multi-service functions. With the support of computer communication technologies and wireless communication technologies, Wireless Local Area Network (WLAN) is brought to life and is recommended widely as an important component of Personal Communication System (PCS). Following ATM and 1000M Ethernet network, WLAN is a hit point in the communication research field now, and is thought highly as the future of communication network. By adopting the optical diffusion communication technology and PPM coding theory, the paper presents a new method to build a Wireless LAN that is fit for broad communication with so many advantages, such as high security, huge capacity and freeing from frequency limitation.The paper contains all kinds of knowledge related to the system, including Maxwell electromagnetic theory, pattern of optical radiation in space, channel model of atmosphere communication, computer communication protocols, Wireless LAN communication protocols, Medium Access Control protocol, Carrier Sense Multiple Access/CollisionDetection protocol, Manchester Coding theory, Pulse Position Modulation Coding theory and so on. The main originalities and latest technologies used in the operation of the system are as following: 1.Connecting computers through optical devices in a LAN wirelessly. high speedily and cheaply by using the technology of optical radiation communication. 2.Applying Manchester Coding theory to meet the end of collision detection and codes judgment effectively. 3.Using Pulse Position Modulation (PPM) coding theory that is invented especially for optical communication in the air to ameliorate the system’s performance by improving the system’s character of PE. 4.Taking good advantages of the fledged LAN communication protocols and technologies to achieve a new method that has a high rate of capability to cost in building a wireless LAN.The paper has done some analysis and research on technologies about Wireless LAN and has made some achievement on it. Wireless LAN based on the technology of optical diffusion communication is very practical and will be competitive in market application. It is a useful supplement to the LAN now and will be more and more important in the future in communication network.更多还原