摘要
针对复杂的海洋环境噪声和水声信道多途效应导致误差反馈DFE均衡器在水声通信中的均衡性能受到严重的限制问题,本文利用信号矢量场和噪声矢量场的相干性差异和矢量水听器振速通道具有偶极子指向性的物理特性,建立单矢量自适应多通道误差反馈DFE均衡器进行抗噪声;利用时间反转镜的空-时聚焦特性进行抑制信道多途干扰。实验结果表明:所提算法不仅保留了误差反馈DFE均衡器的优点,且其抗噪声干扰与信道多途干扰的能力更强,在水声通信中稳定性更好、均衡后误码率更低。
In underwater acoustic communication,complex ocean ambient noise and acoustic channel multipath effect lead to severe limitations in the equalization performance of decision-feedback equalizers(DFEs)using error feedback(EFB)filters.To solve this problem,an adaptive multi-channel decision-feedback equalizer with an error feedback filter(EFB-ADFE)to reduce noise is proposed in this paper.The equalizer operates based on the difference between the coherence of the signal vector field and noise vector field and the physical properties of the dipole directivity found in the velocity channel of the vector hydrophone.Moreover,the time reversals are used to suppress the channel multipath interference.Simulation experiment and field experiment results show that the proposed algorithm retains the advantages of the EFB-ADFE.In addition,its ability to reduce noise and multiple interferences is stronger.It is featured with lower equalization error rate,resulting in a more stable underwater acoustic communication.
作者
生雪莉
阮业武
殷敬伟
韩笑
SHENG Xueli;RUAN Yewu;YIN Jingwei;HAN Xiao(College of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 150001,China;Science and Technology on Underwater Acoustic Laboratory,Harbin Engineering University,Harbin 150001,China;Key Laboratory of Underwater Acoustic Antagonizing,Beijing Institute of Systems Engineering,Beijing,100000,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2018年第12期1894-1901,2016,共9页
Journal of Harbin Engineering University
基金
国家自然科学基金资助项目(51509059
61631008
61471137)
水声对抗技术重点实验室基金资助
海洋公益性行业科研专项经费资助(201405036)
霍英东青年教师基金资助项目(151007)
关键词
水声通信
信道均衡
判决反馈均衡技术
矢量水听器
多通道误差反馈的判决反馈均衡器
时间反转镜技术
自适应算法
underwater acoustic communication
channel equalization
decision-feedback equalization technique
vector hydrophone
multi-channel DFE using error feedback
time-reversal mirror technique
adaptive algorithm
