一种自由空间光通信中自适应光电阵列信号处理算法  

An Adaptive Photoelectric Array Signal Processing Algorithm for Free Space Optical Communication

作　　者：马春波[1] 石俊杰 王莹[1] 张磊 敖珺[1] MA Chun-bo;SHI Jun-jie;WANG Ying;ZHANG Lei;AO Jun(School of Information and Communication,Guilin University of Electronic Technology,Guilin,Guangxi 541004,China)

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《电子学报》2021年第10期1908-1912,共5页Acta Electronica Sinica

基　　金：广西自然科学基金(No.2018GXNSFAA294056)。

摘　　要：大气湍流引起的光束闪烁和抖动,将使光通信接收机焦平面上点扩散函数(Point Spread Function,PSF)随机起伏和漂移,导致光电探测器无法有效覆盖信号光场.针对自由空间光通信(Free Space Optical Communications,FSO)系统在多模高斯背景光噪声场和接收光信号能量效率的限定下最小化系统误码率的问题,提出了一种适用于强度调制/直接检测(Intensity Modulation/Direct Detection,IM/DD)的自适应光电阵列信号处理算法.该方法采用合并阵元路径法计算不同阵元数条件下的系统误码率,并以最小误码率为判决准则,优化接收光电阵元序列.分析和仿真结果表明,在相同大气湍流和背景光噪声条件下,相比于现有的光电阵列处理算法,新方法选取适当的合并阵元数,在极大降低系统计算复杂度的同时,系统性能损耗几乎可以忽略.The light beam flicker and jitter caused by atmospheric turbulence will cause the point spread function(PSF)on the focal plane of the optical communication receiver to randomly fluctuate and drift,causing the photodetector to fail to effectively cover the signal light field.In order to minimize the bit error rate(BER)of free space optical communication(FSO)system under the limitation of multi-mode Gaussian background light noise field and received optical signal energy efficiency,an adaptive photoelectric array signal processing algorithm suitable for intensity modulation/direct detection(IM/DD)is proposed.In this method,the combined array path method is used to calculate the system BER of different array elements,and the minimum BER is used as the criterion to optimize the received photoelectric array element sequence.The analysis and simulation results show that under the same atmospheric turbulence and background light noise conditions,compared with the existing photoelectric array processing algorithm,the new method can greatly reduce the computational complexity of the system,while the system performance loss can be almost ignored.

关 键 词：自由空间光通信 光电阵列接收 自适应阵列算法 

分 类 号：TN929.12[电子电信—通信与信息系统]