自适应速率FSO设计及室内实验结果

Design of an Adaptive Rate-Controlled FSO and Its Indoor Experimental Results

摘要: 自由空间光通信(FSO)是当前遇到困难较大的研究热点。由于光波长很小，FSO很容易受到传输信道的影响。由此一种自适应速率控制FSO系统被研发出来了。通常的研究是采用射频反馈来判定信道条件，进而自适应的改变传输速率。与之不同，本文采用的是对信标光进行功率标定的方法来判定信道条件。本文介绍了自适应速率控制FSO的工作原理，对其进行了电路仿真与硬件实现。对设计的系统进行了室内的实验测试。分别对有无自适应速率控制的两种情况进行了比较。室内实验结果表明自适应速率控制能极大的提高系统性能，在保证高速率的同时保证传输的可靠性。

Abstract: Free space optical communication (FSO) is the current research hotspot that encounters great difficulties. Because the wavelength is very small, FSO is vulnerable to transmission channel. A new kind of adaptive rate-con- trolled FSO system is designed. Usually radio frequency feedback is used to determine the channel conditions by other researchers, and change the transmission rate adaptively. In contrast, in this paper a beacon light power calibration method is employed to determine the channel condition. This paper introduces the work principle of adaptive rate- controlled FSO. Its function is simulated, and the hardware circuit is realized. The system is tested under indoor conditions. Two cases with and without adaptive rate-controlled are compared. The indoor experiment results show that the adaptive rate control can greatly improve the performance of the system, as well as high speed rate and reliability.