L-DACS中的信号分离算法的研究  

Research on algorithm of signal separation in L-DACS

作　　者：杜钊[1] 李宏伟[1] 张建忠[2] 

机构地区：[1]空军工程大学电讯工程学院 [2]中国人民解放军94159部队52分队

出　　处：《传感器与微系统》2012年第6期45-48,共4页Transducer and Microsystem Technologies

摘　　要：L波段数字航空通信系统(L-DACS)是未来20年乃至更长时间航空通信需求的航空通信系统。为了解决接收机更好地区别有用信号,通过研究固定步长EASI算法和变步长EASI(VS-EASI)算法,提出一种基于优选估计函数的EASI峭度变步长(Q-EASI)算法。该算法根据信号的分离状态与峭度方差的关系,使步长随峭度方差的变化而变化,从而使收敛速度与稳态误差之间的矛盾得以缓解,并在信号分离的不同阶段使用不同的估计函数,使稳态误差得以减小。仿真验证,新算法相对于传统算法在稳定性和收敛速度上都有较大提高。In future 20 years or even longer,the L-band digital aeronautical communication system(L-DACS)is needed for aeronautical communication.In order to separate useful signal in the receiver,by studing EASI algorithm and variable step-size EASI algorithm.Kurtosis variable step-size EASI algorithm based on optimal estimation function is proposed.According to the relationship between the covariance of kurtosis and the state of separation,step-size is controlled with the covariance of kurtosis,it overcomes the contradiction inherent in existing approaches between convergence speed and steady-state error.Meanwhile,two different estimation functions are used in different state of separation.It decreases the steady-state error efficiently.The simulation experiment results show that the proposed algorithm has been greatly improved in convergence speed and stability compared with conventional algorithms.

关 键 词：L波移数字航空通信系统 信号分离 峭度 优选估计函数 

分 类 号：TN911.7[电子电信—通信与信息系统]