摘要
研究了大气—水下无线光通信下行链路中海面折射对光信道和光接收的影响,采用Windows三维图形函数Direct3D通过图形处理器(GPU)进行复杂的几何运算并实现光信道三维可视化,利用二维谱的海浪模型得出不同风速和风区等条件下海面的随机波动对光线簇传输路径、海底光斑和接收点光强的影响;根据仿真所得数据对接收端积分判决电路的时间常数、光强起伏和误码率三者之间的关系进行了分析,为跨界面传输的无线光通信系统设计提供预见性的动态信道模型参考。
The influence of refraction by the air-sea interface on the optical channel and reception in the downward link from the air to underwater wireless optical communication was studied.The complicated 3-D geometry calculations and visualization of the optical channel were implemented via Graphic Processing Unit（GPU） by the Direct3D functions in the Windows system.Refraction of the light ray cluster by the sea surface fluctuation in the sea wave model of 2-D spectrum were computed,whereby the light field on the horizontal plane within which the receiver was located under various wind speed and wind field could be calculated.The relationship among the time constant of integrating judging circuit of the receiver,light intensity fluctuation and Bit Error Rate（BER） was analyzed from the simulation data,to provide a predictive and dynamic model of transmission channel in reference for the wireless optical communication system design in the case of the trans-interface transmission.
出处
《计算机应用》
CSCD
北大核心
2011年第A01期19-22,共4页
journal of Computer Applications
基金
国家自然科学基金资助项目(61077036
60972084)
广西研究生教育创新资助项目(2010105950809M19)
关键词
信道仿真
图形处理器运算
DIRECT3D
海浪模型
无线光通信
误码率
channel simulation
Graphic Processing Unit（GPU） computation
Direct3D
ocean wave model
wireless optical communication
Bit Error Rate（BER）
