一种低复杂度和便于硬件移植的非线性均衡算法及其UWOC实时补偿实验演示  

A Low-Complexity and Hardware-Portable Non-Linear Equalization Algorithm and Experimental Demonstration of Its Real-Time Compensation for UWOC

作　　者：肖胡浩 殷洪玺[1] 王建英 黄安 季秀阳 Xiao Huhao;Yin Hongxi;Wang Jianying;Huang An;Ji Xiuyang(School of Information and Communication Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学信息与通信工程学院,辽宁大连116024

出　　处：《光学学报》2024年第6期238-247,共10页Acta Optica Sinica

基　　金：国家自然科学基金(61871418)。

摘　　要：提出一种低复杂度、低功耗且便于硬件移植、可应用于水下无线光通信(UWOC)系统的基于链表和线性表的稀疏Volterra(3l-sVolterra)算法,它通过结合链表与线性表的新数据结构来存储Volterra算法中的所有参数,有效降低了Volterra算法更新参数所需的片上资源消耗,同时能对参与运算的非线性项进行稀疏处理,便于移植到小型硬件系统中。随后,在C6748芯片上实现了所提出的算法,并搭建了基于绿光LED的UWOC系统,对设计的数字信号处理(DSP)系统和UWOC系统进行了性能测试。结果表明,与无稀疏操作的Volterra算法相比,所提算法能在保留相近非线性补偿能力的同时,将资源消耗降低30%,在5 m长水箱信道UWOC系统中实现了20 Mbit/s的通信速率。Objective Underwater wireless optical communication(UWOC)has advantages such as high bandwidth,high data rate,low latency,and small form factor.It can support the transmission of high-speed,high-capacity,real-time,and multimedia services like underwater images and videos.Light-emitting diodes(LEDs)are cost-effective light sources with high energy efficiency,and their wide-angle beam profile relaxes the alignment requirements between the transmitter and receiver.However,high-power LED sources have narrow bandwidth and exhibit strong non-linear effects.Additionally,the underwater optical channel is affected by absorption,scattering,turbulence,and bubbles,while the photodetectors may also exhibit non-linear effects.These factors lead to non-linear distortion of the optical signal,severely affecting communication bandwidth and limiting transmission distance.The Volterra algorithm is commonly used for non-linear compensation in communication systems,but it has high complexity and computational overhead.Most existing research on the Volterra algorithm involves offline processing,which is not conducive to miniaturization and low power consumption in underwater environments.Therefore,we propose a low-complexity,low-power,and hardware-friendly 3l-sVolterra(link and linear list-based sparse Volterra)algorithm for UWOC systems.By combining new data structures based on linked lists and linear lists to store all the parameters of the Volterra algorithm,the on-chip resources required for updating the Volterra algorithm s parameters are effectively reduced.It also facilitates sparse processing of the participating non-linear terms,making it suitable for small-scale hardware systems.Compared with the 3l-Volterra algorithm without sparsity operations,this algorithm reduces resource consumption by 30%while preserving similar non-linear compensation capabilities.We hope that the proposed 3l-sVolterra algorithm can promote miniaturization and real-time underwater applications of UWOC systems.Methods The 3l-sVolterra algorithm utiliz

关 键 词：光通信 非线性均衡算法 数字信号处理 链表与线性表 非线性项稀疏处理 

分 类 号：TN929.1[电子电信—通信与信息系统] TN929.3[电子电信—信息与通信工程]