LED自由空间光通信系统关键技术研究
发布时间：2018-08-16 10:10
【摘要】：LED自由空间光通信技术(LED based free space optical communication,简称LED FSO)是一种以LED作为传输载体的无线光通信技术。在LED FSO系统中,信号以直接强度调制的方式调制LED光强并通过光学发射天线发送至自由空间光通信信道中。本文从系统实现和性能研究的角度出发,对LED自由空间光通信这种新兴的无线光通信技术展开研究。针对成像LED自由空间光通信技术,研究了单输入单输出方式下基于图像处理技术的解调算法;为了提升系统整体性能,提出了基于多输入多输出(Multi-input Multi-output,简称MIMO)技术的解调算法,并分析了成像系统中杂散光对通信性能的影响。针对非成像LED自由空间光通信技术,研究了大功率LED驱动电路和信号接收处理电路的设计,以实现系统远距离通信的应用;介绍了系统的整体设计与实现,研究了光学系统的能量计算,在外场实验的基础上对系统整体性能作出了进一步的分析。针对LED的非线性对系统性能的影响,研究了非线性的产生机理,提出了基于高斯函数的非线性模型,并在此基础上提出一种预失真算法,达到了减轻LED非线性影响、提升系统性能的目的。
[Abstract]:LED free space optical communication technology (LED based free space optical communication, is a wireless optical communication technology based on LED. In LED FSO system, the signal modulates the intensity of LED in a direct intensity modulation mode and transmits it to the free space optical communication channel via an optical transmitting antenna. From the point of view of system implementation and performance research, this paper studies the LED free space optical communication, a new wireless optical communication technology. Aiming at the imaging LED free space optical communication technology, the demodulation algorithm based on image processing technology in single input and single output mode is studied, and in order to improve the overall performance of the system, a demodulation algorithm based on Multi-input Multi-Output (MIMO) technology is proposed. The effect of stray light on communication performance in imaging system is analyzed. Aiming at the non-imaging LED free-space optical communication technology, the design of high-power LED driving circuit and signal receiving and processing circuit is studied to realize the application of remote communication, and the whole design and implementation of the system are introduced. The energy calculation of the optical system is studied, and the overall performance of the system is further analyzed on the basis of the field experiments. Aiming at the influence of LED nonlinearity on the system performance, the mechanism of nonlinear generation is studied, and a nonlinear model based on Gao Si function is proposed. Based on this, a predistortion algorithm is proposed, which can reduce the nonlinear effect of LED. The purpose of improving system performance.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1
[Abstract]:LED free space optical communication technology (LED based free space optical communication, is a wireless optical communication technology based on LED. In LED FSO system, the signal modulates the intensity of LED in a direct intensity modulation mode and transmits it to the free space optical communication channel via an optical transmitting antenna. From the point of view of system implementation and performance research, this paper studies the LED free space optical communication, a new wireless optical communication technology. Aiming at the imaging LED free space optical communication technology, the demodulation algorithm based on image processing technology in single input and single output mode is studied, and in order to improve the overall performance of the system, a demodulation algorithm based on Multi-input Multi-Output (MIMO) technology is proposed. The effect of stray light on communication performance in imaging system is analyzed. Aiming at the non-imaging LED free-space optical communication technology, the design of high-power LED driving circuit and signal receiving and processing circuit is studied to realize the application of remote communication, and the whole design and implementation of the system are introduced. The energy calculation of the optical system is studied, and the overall performance of the system is further analyzed on the basis of the field experiments. Aiming at the influence of LED nonlinearity on the system performance, the mechanism of nonlinear generation is studied, and a nonlinear model based on Gao Si function is proposed. Based on this, a predistortion algorithm is proposed, which can reduce the nonlinear effect of LED. The purpose of improving system performance.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1
【参考文献】
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