自由空间光纤通信系统码间干扰抑制技术

Intersymbol Interference Suppression Technology in Free Space Optical Fiber Communication System

自由空间光纤通信系统传输时,受大气湍流效应影响导致通信信号任意起伏,使得接收信号的码间出现干扰,严重影响通信质量。提出自由空间光纤通信系统码间干扰抑制技术。采用空间矩阵与标准对数协方差,构建自由空间光纤通信系统模型,分析传输过程产生码间干扰原因。利用射线模型获得各信号能量聚焦,使用自适应级联滤波设备与单极性单周补偿控制,抑制通信码间部分干扰,采用时间翻转镜完成剩余部分通信码间干扰抑制。实验结果表明:这种方法能够有效抑制通信系统的码间干扰,提升了通信输出信号信噪比,且降低了误码率。说明该技术能有效提升通信信号传输质量,具有较好的使用价值。

When the free space optical fiber communication system is transmitting,the communication signal fluctuates arbitrarily due to the atmospheric turbulence effect,which causes the inter symbol interference of the received signal and seriously affects the communica-tion quality.The inter symbol interference suppression technology of free space optical fiber communication system is proposed.Based on the spatial matrix and standard logarithm covariance,a free space optical fiber communication system model is constructed,and the cause of intersymbol interference in the transmission process is analyzed.The ray model is used to obtain the energy focus of each sig-nal.Through the adaptive cascade filtering equipment and unipolar one cycle compensation control,the inter symbol interference of com-munication is suppressed.The time reversal mirror is used to suppress the remaining inter symbol interference.The experimental results show that this method can effectively suppress the inter symbol interference of the communication system,improve the signal-to-noise ra-tio of the communication output signal,and reduce the bit error rate.It shows that this technology can effectively improve the transmis-sion quality of communication signals,and has good application value.