机载AIS系统信道建模及估计  

Channel Modeling and Estimation for Airborne AIS

作　　者：孙金[1] 马社祥[1] 孟鑫[1] 

机构地区：[1]天津理工大学计算机与通信工程学院,天津300384

出　　处：《计算机仿真》2015年第5期218-221,共4页Computer Simulation

基　　金：国家自然科学基金项目(61371108)

摘　　要：针对航空通信中的多径效应会严重影响系统接收端的通信质量,而传统信道估计算法存在收敛速度慢,计算复杂度过高,对信道参数的估计不准确的问题。根据机载船舶自动识别系统实际通信环境的特点,建立了满足莱斯衰落的频率选择性信道模型,并提出了一种适用于信道估计的快速最小均方误差算法。上述算法在训练序列的辅助下,通过高斯消元法估计出信道参数,并依据最小均方误差思想,得到信道估计的快速收敛形式。仿真结果表明,快速最小均方误差算法能够快速准确的估计出信道参数,两次迭代后其均方误差即可达到0.005左右,且具有计算复杂度低,收敛速度快等优点,能够显著提高机载AIS系统的通信性能。Considering the devastating effects of muhipath propagation in the airborne communication system, a frequency-selective channel model is established for the airborne A1S（ Automatic Identification System） and a fast LMS （Least Mean Square） algorithm is proposed for the channel estimation. By using the training sequence, Gaussian elimination method is adopted to obtain the accurate channel parameters. In addition, an algorithm with rapid conver- gence for the channel estimation is presented based on LMS. The simulation results show that the proposed method can achieve the accurate channel estimation and its NMSE（ Normalized Mean Square Error） can be reduced to 0.005 after two iterations, moreover, it has low computational complexity and rapid convergence.

关 键 词：机载船舶自动识别系统 莱斯衰落 频率选择性信道 最小均方误差 高斯消元法 

分 类 号：TN911[电子电信—通信与信息系统]