【作者】 赵栋；

【导师】 刘陈；

【作者基本信息】 华中科技大学 ， 光学工程， 2011， 硕士

【摘要】 室内可见光无线通信系统是基于第四代环保节能照明光源白光发光二极管(LED)来设计的,该系统不仅能满足普通室内照明需求,而且能够进行高速光无线通信。随着白光LED照明技术的不断推广,该系统可以为未来高速宽带无线接入提供一种很好的解决方案。由于我国电力线分布广泛,而室内可见光通信系统还能与电力线通信结合起来,因此,室内可见光无线通信系统的研究有着十分重要的发展意义。本论文在前人研究的基础上,对正交幅度调制(QAM)在室内可见光无线通信中的应用进行了相关研究。该系统主要由三个模块组成:信号发射模块、信号接收模块和QAM调制解调模块。本论文对信号发射模块中的大功率白光LED驱动技术进行了深入研究,并对发射模块中各个子模块均进行了电路仿真,并给出了系统的仿真结果。信号接收模块中,对光电探测系统的频率特性和线性特性进行了电路仿真,并对实际接收系统进行了相关功能测试。QAM调制模块为基于现场可编程门阵列(FPGA)的全数字处理系统,该系统充分利用了FPGA的各种类型的I/O通道、数字信号处理单元、内置的随机存储器(RAM)单元、锁相环等各种功能及资源模块,用来对信号进行实时处理。最后,本论文对基于QAM的室内可见光无线通信系统进行了整体功能测试,并给出了相关测试结果。更多还原

【Abstract】 Indoor visible light wireless communication system is designed based on the white LED, which is the fourth environment-friendly and energy-saving lighting source. The system can not only meet the needs of ordinary indoor lighting, but also do a high-speed wireless optical communication. AS the white LED lighting technology being promoted, the system can supply a good solution for the future high-speed broadband wireless access. Because electric-power lines are widely distributed in our country, and the system can combine with the electric-power line communication in the future research, so the visible light communication system research has an important developing significance.On the basis of previous studies, this thesis does some relevant research on the application of QAM in the indoor visible light wireless communication. The system mainly consists of three modules: the signal transmission module, the signal receiving module and the QAM modulation and demodulation module. A deep research has been done on the high-power white LED driven technology, and the circuit simulation have been done for each sub-module of the transmission module, then the system simulation results have been given. In the signal receiving module, this paper does a circuit simulation on the frequency characteristics and linear characteristics of the photoelectric detection system, after that, the relevant functional tests had been done to the receiving system. QAM modulation module is a all-digital processing system based on FPGA, which takes full advantage of the various types of FPGA I/O channels, digital signal processing unit, built-in RAM modules, PLL modules and other resources for the real-time signal processing. Finally, the whole functional tests have been done for the indoor visible light communication system based on QAM, and the relevant testing results have been given in this thesis.更多还原