基于高阶统计量的L-DACS1系统自适应干扰消除技术研究  

Adaptive Interference Cancellation for L-DACS1 by the Usage of High Order Statistics

作　　者：曾孝平[1] 贺渊[1] 简鑫[1] 黄杰[1] 李梦如[1] 

机构地区：[1]重庆大学通信工程学院,重庆400030

出　　处：《电子学报》2016年第10期2377-2383,共7页Acta Electronica Sinica

基　　金：国家自然科学基金重大研究计划(No.91438104);面上项目(No.61571069);青年项目(No.61501065);中央高校基本科研业务费资助项目(No.106112015CDJXY160002);重庆市研究生科研创新项目(No.CYS14005)

摘　　要：针对L-DACS1(L-band Digital Aeronautical Communication System Type 1)与DME(Distance Measuring Equipment)信号在时域、频域和低阶统计域干扰抑制不理想的问题,本文将L-DACS1与DME时频域交叠的干扰场景建模为确定性信号叠加高斯有色噪声的干扰量化模型,根据两者在高阶统计域的差异特性,提出基于三阶累积量的自适应滤波算法,并引入对数螺线函数改进变步长机制,实现自适应DME干扰消除.仿真结果表明:所提算法具有更高的干扰抑制比和更低的误比特率,但复杂度较高.相关结论可为L-DACS1系统的实际部署提供参考.To mitigate DME pulse interference over L-DACS1 and overcome the shortage of conventional solutions in time,frequency or second-order statistics domain,an innovative adaptive interference cancellation scheme by the usage of high-order statistics is introduced,namely CE-LMS. CE-LMS models the coexistence of L-DACS1 signal and DME interference as a deterministic signal plus colored Gaussian noises,and employs a cost function based on the three-order cumulant statistics and a variable step adjustment mechanism based on logarithmic function. All this together allowCE-LMS to eliminate the pulse-like DME interference from L-DACS1. Numerical results showthat CE-LMS algorithm can achieve a better cancellation ratio and lower bit error rate with a increase in computational complexity,which may help to the deployment of L-DACS1.

关 键 词：L波段数字航空通信系统 测距机系统 高阶统计量 干扰消除 自适应滤波 

分 类 号：TP911.4[自动化与计算机技术]