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.
出处
《传感器与微系统》
CSCD
北大核心
2012年第6期45-48,共4页
Transducer and Microsystem Technologies
