基于16PSK调制的副载波无线光通信实验研究  

Experimental Research on Wireless Optical Communication Based on 16PSK Subcarrier Modulation

作　　者：陈丹[1] 柯熙政[1] 张拓[1] 代鲁[1] 

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048

出　　处：《中国激光》2015年第1期197-204,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(61377080);陕西省自然科学基金(2012JQ8004);西安市科技计划项目基金(CXY1341(5));陕西省教育厅科学研究计划(14JK1542);西安理工大学大学生科技创新基金(2013CX014);西安理工大学高层次人才基金(105-211202)

摘　　要：大气湍流和天气条件势必影响无线光通信所传输的光信号质量,增加系统误码率,减小通信距离。实验基于现场可编程门阵列(FPGA)和AD9788设计了无线光副载波16进制相移键控(16PSK)调制模块,搭建了基于副载波调制的无线光通信系统,并在4种不同天气条件(阴、小雨、中雨、小雪)下进行了通信实验。对比分析了接收端信号的星座图、误码率、眼图和功率谱,其中阴天星座图相位信息聚敛性明显,误码率约为2.9×10-3,而雪天相位信息弥散;四种天气下功率谱曲线在载频处功率均最大,且阴天和小雨功率谱曲线抖动小、更光滑。实验结果验证了所设计的16PSK副载波调制无线光通信系统实现点对点通信的可行性。Atmospheric turbulence and the weather conditions are bound to affect the quality of optical signal in wireless optical communication, increase the system error rate and reduce the communication distance. 16 binary phase shift keying （16PSK） subcarrier modulation block in wireless optical communication system is designed based field programmable gate array （FPGA） and AD9788. Subcarrier modulated wireless optical communication system is established, and communication experiments are performed under four weather conditions （cloudy, sunny, rainy, snowy）. The constellation diagram, error rate, eye diagram and the power spectrum on different weathers are analyzed and contrasted at the receiver. The phase convergent information in cloudy is better than other weathers, and the bit error rate is about 2.9 × 10-3, while phase information is dispersive in snowy. Power spectrum curve has the largest power at the carrier frequency under four kinds of weather, and the spectrum curves under cloudy and light rain weathers are smoother and less jitter. The experimental results prove that the wireless optical communication on subcarrier 16PSK modulation is feasible to realize point to point communication.

关 键 词：光通信 无线光通信 16PSK调制 不同天气 星座图 误码率 

分 类 号：TN929.1[电子电信—通信与信息系统]