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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 weather conditions will inevitably affect the quality of optical signals transmitted by wireless optical communications, increase the system bit error rate and reduce the communication distance. Based on field programmable gate array (FPGA) and AD9788, a wireless optical subcarrier 16-ary phase-shift keying (16PSK) modulation module was designed and a wireless optical communication system based on subcarrier modulation was set up. In 4 different weather conditions (Overcast, light rain, moderate rain, light snow) under the communication experiment. The constellation, bit error rate, eye diagram and power spectrum of the receiver signal are compared and analyzed. The phase information of the cloudy constellation map has obvious convergence, the bit error rate is about 2.9 × 10-3, and the snow phase phase information is diffused. Under the weather, the power spectrum curve has the largest power at the carrier frequency, and the jitter of cloudy and light rain power spectrum curve is small and smoother. The experimental results verify the feasibility of the designed 16PSK subcarrier modulated wireless optical communication system for point-to-point communication.