基于光OFDM信号导频功率分配优化的信道估计研究  

Channel estimation based on optical OFDM signal pilot power allocation optimization

作　　者：秦坚 袁越 付金磊 尚玺 Qin Jian;Yuan Yue;Fu Jinlei;Shang Xi(School of Resources, Environment and Safety Engineering, Hunan University of Science and Technology, WorkSafety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan KeyLaboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology, Xiangtan411201, China)

机构地区：[1]湖南科技大学资源环境与安全工程学院南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室煤矿安全开采技术湖南省重点实验室

出　　处：《湖南文理学院学报（自然科学版）》2019年第4期13-19,共7页Journal of Hunan University of Arts and Science(Science and Technology)

基　　金：湖南省教育厅科研资助项目(15C0551)

摘　　要：针对光通信传输时会受到色散和衰减的影响,传输过程中融合拥有高频谱率和抗干扰色散等特性的新技术—正交频分复用(OFDM)技术,可以有效地减弱各种干扰影响.结合Matlab、OptiSystem仿真平台与导频信道估计技术,建立直接检测光OFDM系统仿真模型,设计5种功率分配优化方案并开展仿真试验研究.结果表明:当导频功率随频率增加而递增时,OFDM信号的误码率(BER)性能最优,功率随频率增加而递减时OFDM信号的BER性能最差;频率增加而导频功率先递减后递增的分配方式最佳,等功率的分配方式最差.导频功率分配时,在信道状况相对较差的高频和低频处适当增加导频功率可有效抑制衰减和干扰,系统性能处于最佳状态.For optical communication transmission will be affected by dispersion and attenuation. In the transmission process, a new technology with high spectral rate and anti-interference dispersion, Orthogonal Frequency Division Multiplexing (OFDM) technology, can effectively reduce various interference effects. Combined with Matlab, OptiSystem simulation platform and pilot channel estimation technology, the simulation model of direct detection optical OFDM system is established, five power allocation optimization schemes are designed and simulation experiments are carried out. The results showed that: When the pilot power increases with increasing frequency, the error rate (BER) performance of the OFDM signal is optimal. BER performance of OFDM signal is the worst when power decreases with increasing frequency. The best way to distribute as the pilot power is first decremented and then incremented as frequency increases. And the equal power distribution is the worst. When the pilot power is allocated, the attenuation and interference can be effectively suppressed by appropriately increasing the pilot power at the high frequency and low frequency of the channel, and the system performance is in an optimal state.

关 键 词：光通信 光正交频分复用 直接检测 导频 信道估计 

分 类 号：TN91[电子电信—通信与信息系统]