弹载数据链系统MMSE信道均衡算法研究

Research on MMSE Channel Equalization Algorithm in Missile Data Link System

弹载数据链系统在实际作战中将面临近地、近海等复杂的电磁环境,该环境下,需要克服由信号反射、绕射、散射所引起的多径效应。针对弹载数据链系统的特点选择了MMSE信道均衡算法,并在算法应用中对训练序列的产生、信噪比估计、信道状态估计等问题提出了解决具体方案。最后在海上空空信道环境下对算法的性能进行仿真,仿真结果表明当第二径相对主径的衰减大于-3d B时,使用MMSE均衡算法后,可以明显提升系统性能。

The missile data link system will face complex electromagnetic environment such as low-attitude and offshore environment in actual combat, in this environment, the multipath effect caused by signal reflection, diffraction and scattering should be overcome. The MMSE channel equalization algorithm is chosen according to the characteristics of the missile data link system, and the solution to the problem of training sequence generation, signal-to-noise ratio estimation and channel state estimation in its specific applications is proposed. In the end, the performance of the algorithm is simulated in maritime Air-to-air channel environment. The simulation results show that when the relative attenuation between the second path and main path is greater than-3 d B, the performance of the system is obviously improved after using the algorithm.