Transformer辅助的超奈奎斯特速率无线光滤波器组多载波检测算法  

Transformer Aided Faster Than Nyquist Rate Wireless Optical Filter Bank Multicarrier Detection Algorithm

作　　者：陈轩 曹明华[1] 张悦 王惠琴[1] 韩生春 Chen Xuan;Cao Minghua;Zhang Yue;Wang Huiqin;Han Shengchun(School of Computer and Communication,Lanzhou University of Technology,Lanzhou 730050,Gansu,China)

机构地区：[1]兰州理工大学计算机与通信学院,甘肃兰州730050

出　　处：《光学学报》2025年第1期37-47,共11页Acta Optica Sinica

基　　金：国家自然科学基金(62265010);甘肃省自然科学基金(24JRRA183,24JRRA974);兰州理工大学博士基金(14062101)。

摘　　要：针对光正交频分复用(OOFDM)传输技术存在带外衰减慢、频谱利用率不高的问题,将超奈奎斯特(FTN)技术与光滤波器组多载波(OFBMC)技术结合,提出了一种超奈奎斯特速率无线光滤波器组多载波(OFBMC-FTN)传输方案。基于Gamma-Gamma湍流信道模型,推导了该系统在最大似然准则下的理论误码率表达式,并采用蒙特卡罗仿真验证了理论分析的正确性。在此基础上,针对OFBMC-FTN发送信号的特点,提出了基于Transformer网络的信号检测算法FBMCFormer来降低检测复杂度。结果表明,当FTN的压缩因子为0.9时,系统的频谱效率比直流偏置光滤波器组多载波、非对称限幅光滤波器组多载波和光正交频分复用技术分别提升了11.1%、94%和120%。同时,对于不同的湍流强度,所提检测算法的误码性能在接近最大似然最优检测的同时大幅降低了计算开销。Objective Optical orthogonal frequency division multiplexing(OOFDM) technology,widely employed in free-space optical(FSO) communication,faces challenges such as slow out-of-band attenuation and limited spectral efficiency.These issues are especially pronounced in environments affected by atmospheric turbulence,which further reduces the effectiveness of OOFDM.To address these challenges,we propose a novel transmission scheme that combines faster than Nyquist(FTN) signaling with optical filter bank multicarrier(OFBMC) technology,creating the OFBMC-FTN system aimed at enhancing spectral efficiency without sacrificing performance.Additionally,we introduce FBMCFormer,a Transformer-based detection algorithm that leverages the multi-head self-attention mechanism of the Transformer to improve detection performance,particularly in turbulent environments commonly encountered in FSO systems.This approach responds to the growing demand for higher data transmission rates and more reliable communication systems,especially under challenging atmospheric channels.Methods Our study employs a dual approach,combining theoretical derivations and Monte Carlo simulations,to evaluate the proposed OFBMC-FTN system.We derive the theoretical bit error rate(BER) expression for the system using the maximum likelihood criterion and the Gamma-Gamma turbulence channel model,suitable for simulating atmospheric turbulence effects on optical signals in FSO systems.We assess system performance under varying turbulence intensities—weak,moderate,and strong—to ensure a comprehensive analysis across different conditions.A key innovation of this research is the FBMCFormer detection algorithm designed specifically for the OFBMC-FTN system.Utilizing Transformer networks,FBMCFormer captures both temporal and spatial dependencies in signal sequences.The multi-head self-attention mechanism within FBMCFormer prioritizes the most relevant signal components,thereby enhancing detection accuracy.FBMCFormer's architecture consists of an input layer,a Transform

关 键 词：光通信 光滤波器组多载波 超奈奎斯特 频谱效率 TRANSFORMER 信号检测 

分 类 号：TN929.12[电子电信—通信与信息系统]