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。 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.
其他摘要：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.
